No Summer, No Vacation, No Fun, No Kidding – WIF Into History

Leave a comment

Global Impact

of the Year

Without a Summer

The year 1816 was the first since the onset of the French Revolutionary Wars in which the western world was at peace. In Europe, the nightmare of the Napoleonic Wars began to fade. In North America, Washington DC began the process of rebuilding after being burned by the British Army during the War of 1812. Global commerce was expected to thrive, unimpeded by the raiding ships of nations locked in a death grip with each other. Farmers expected strong markets for their crops, shippers looked forward to record profits, manufacturers hoped the return of peace would create demand for their products. But then a funny thing happened. There was no summer. As late as August of that year, hard freezes in the farmlands of upper New York and New England destroyed what little crops had been planted during a spring of continuous snow and freezing weather.

1816 was the year of no summer, not just in North America, but across the Northern Hemisphere. Record cold, freezing rains, floods, and frosts occurred throughout the months in which warmer weather could be reasonably expected, given centuries of its showing up more or less on schedule. It did not, and without global communication to understand why, the underpinnings of civilization – farming and trade – suffered across the globe. The year with no summer is now understood to have been the result of a series of geological events which masked the sun with volcanic dust, but to those who endured it, it was simply an inexplicable disaster. The commercial effects continued to be felt for years, as financial markets roiled from the unexpected disruption of trade and investment. For those unconcerned with climate change it remains a stark, though wholly ignored, warning of the power of nature. Here are just a few of its impacts.

10. Thomas Jefferson found his indebtedness increased by drastic crop failures

In 1815 former president Thomas Jefferson, living in retirement at his Monticello estate, offered his personal library as replacement for the losses suffered by the Library of Congress when the British burned the American capital. The sale was a gesture which gained Jefferson some temporary praise, but more importantly to him it provided an infusion of badly needed money. The former president was broke, and the $23,950 (almost $400,000 today) he received alleviated some, but by no means all, of his indebtedness. Jefferson was relying on a strong crop from his Virginia farms in 1816 to reduce his debts further. In his Farm Book for 1816 Jefferson noted the unusual cold as early as May; “repeated frosts have killed the early fruits and the crops of tobacco and wheat will be poor,” he wrote.

Jefferson struggled with the bizarre weather throughout the summer months, recording temperature and rainfall data still used by scientists studying the phenomenon, but he was unaware of its cause. He did lament its effect. Jefferson’s corn and wheat crops were reduced by two thirds, his tobacco even more so, and the former president slipped yet more deeply into debt, as did most of the farmers of the American states of Virginia, Maryland, Kentucky, Tennessee, and all of New York and New England. The failure of tobacco crops was particularly devastating, ships which normally would have carried the cured leaves to Europe lay idle, and British tobacconists shifted to plantations in Africa as the source of the weed, in high demand in Europe. During the summer, Jefferson reported frosts in every month of the year in the higher elevations of Virginia, and in every state north of his farms.

9. Prices of grains spiked as the summer went on, and remained high for nearly three years

In Virginia, oats were a crop which was considered essential to the survival of the economy. Oats were consumed by humans in the form of porridge, and in oat breads and cakes, but the grain was also an essential part of the diet of horses. Horses were of course critical in the early 19th century as motive power for plows and transportation. The shortage of oats caused the farmers who produced it to respond to the insatiable demand for the grain by raising their prices on the little they were able to harvest. According to Jefferson and other Virginia farmers, oats cost roughly 12 cents per bushel in 1815, a price already inflated by the demand placed on the crops by the recently ended War of 1812, when armies needed horses for cavalry and as draft animals.

By midsummer of 1816, oats had increased to nearly $1 per bushel, an increase which most were unable to pay. The shortage of grain, (as well as other fodder) meant what horses were available were often undernourished. European markets were unable to make up the shortage, as Europe too was locked in the grip of the low temperatures and excessive rains. In Europe the cost of maintaining horses increased dramatically, and the use of horseback for individual travel became the privilege of the wealthy few. A German tinkerer and inventor by the name of Karl Drais began experimenting with a device consisting of a piece of wood equipped with a seat upon which a person would perch while moving the legs in a manner similar to walking. Called variously the velocipede, the laufmaschine, and the draisine, it was the precursor for what is now known as the bicycle.

8. Temperatures throughout the Northern Hemisphere were abnormally cold, especially in New England

The New England states were particularly hard hit during the summer of 1816 by abnormally low temperatures. In the New England states, which were at the time still mostly agricultural, every month of the year suffered at least one hard frost, devastating crops in the fields and the fruit trees which had managed to blossom during the long and wet spring. On June 6, a Plymouth, Connecticut clockmaker noted in his diary that six inches of snow had fallen overnight, and he was forced to wear heavy mittens and his greatcoat during his customary walk to his shop. Sheep were a product of many New England farms, well adapted to grazing on the hillsides in pastures too small to accommodate cattle herds. Shorn in late winter, as was customary, many died in the unexpected cold, and the price of lamb and mutton reached record highs.

By the end of June, temperatures in New England had begun a rollercoaster ride which they would retain for the rest of the summer, further damaging crops and livestock. Late June in western Massachusetts saw temperatures reach 101 degrees only to plummet to the 30s over the Fourth of July. Men went about in their hayfields harvesting their sparse yields dressed in overcoats. Beans – long a staple crop of New England – froze in the fields. From Puritan pulpits across the region, the weather was attributed to a righteous judgment of God. In August there was measurable snowfall in Vermont, and though winter wheat crops yielded some harvests, the cost of moving the grain to market was often prohibitive. New Englanders, especially in the rural areas, began to forage off the land in the manner of their ancestors, surviving on what game and wild plants they could find in the woods.

7. The lack of summer provided one of literature’s most infamous characters

Most people had no idea what were the scientific reasons behind the bizarre weather in the summer months of 1816. Many of the wealthy, better able to weather the storm, so to speak, went about their business despite the adverse weather conditions. In Europe, a group of young English writers and their guests summered at Lake Geneva, Switzerland. The group included Lord Byron and an English poet named Percy Shelley, who brought with him his wife, the former Mary Wollstonecraft. Housebound by the continuing inclement weather (Mary later wrote that it was an ungenial summer), the group was forced to find ways to entertain themselves. Bored of playing parlor games one of the members, probably Lord Byron, suggested that each member of the group write a story, along the lines of a ghost story, for the entertainment of the rest.

Mrs. Shelley at first balked at the idea, unable to come up with a plot until mid-July, when she confided to her diary that at the group’s nightly discussions she arrived at the idea of “Perhaps a corpse could be reanimated.” She began writing a short story, which grew into a full length gothic novel which she entitled,  “Frankenstein; or, The Modern Prometheus.” Her husband was later credited with assisting Mary with the work, though the extent of his contributions to the classic tale of horror remains disputed by scholars. Mary Shelley later credited her inspiration to a waking dream which came upon her during one of her long walks in the woods around Geneva, immersed in the gloom of the strange weather that summer. Shelley wrote that while her husband Percy – who committed suicide in 1822 – helped her with technical aspects of the writing, the tale wholly originated with her.

6. The year with no summer coincided with the end of the Little Ice Age

The year without summer is commonly ascribed to the summer months of 1816, though its effects were felt for three years, part of the final months of what is known as the Little Ice Age. Crop failures were acute in the first harvest season of the period, and such continued for at least another two years. Wet and cold weather impeded planting in the spring as well as harvests in the fall, and the size of the harvests from North America to China were insufficient to support the populations. Hunger became famine in many areas, including Europe and China, residents of rural communities migrated to urban areas in search of food through begging, and population density grew those diseases which strengthen among hungry populations, including cholera and typhus. Medicine of the time was inadequate to treat either.

The result was a globally felt – at least in the Northern Hemisphere – calamity, which encompassed starvation, diseases, and popular unrest for a period of three years. Hundreds of thousands of former soldiers, veterans of the Napoleonic Wars, roamed Europe seeking the means to feed themselves and their families. In England sailors who had manned the ships of His Majesty’s Navy found themselves unemployed as warships were decommissioned, and the absence of crops reduced the amount of goods available for international trade. Ships rotted at their moorings. By the summer of 1817 organized groups of former soldiers across Europe were rioting in the belief that government warehouses held grain being kept from the starving people. In the United States, especially in still largely agricultural New England, failed crops caused farmers to pull up stakes and head for the promised lands west of the Ohio River.

5. The Swiss disaster of 1816-1817 was among the worst of the global catastrophe

Over a period of 153 days between April and September, 1816, Geneva, Switzerland recorded 130 days of rain. The temperature remained too cold for the snow in the Alps to melt, which prevented the disaster from being far worse. The streets, and more importantly the sewers and drains, of Geneva were flooded, and Lake Geneva was too swollen with rain to absorb the runoff. Meanwhile local crops were drowned by the incessant chill rains, and the harvest of 1816 was a complete failure, leading to the last recorded famine on the European continent. The lack of fodder led to the demise of hundreds of thousands of draft animals and cattle and oxen died in the waters in the fields and alongside the Swiss roads. Hundreds of thousands of Swiss were rendered homeless, living in the streets and fields unable to feed themselves, as the brutal cold of an Alpine winter settled upon them.

Beginning in early 1817 the death rate in Switzerland, already well above normal due to starvation and disease, increased by more than 50%. Oxen, horses, and cattle dead from starvation and rotting in the fields became sources of food for the desperate populace. Aid from European neighbors was nonexistent, as the harvests on the continent and in England were similarly sparse. France had but recently survived its revolution and the ravages of the Napoleonic Era, it was short of manpower, and its newly restored monarchy was inadequate to the challenges of the disaster which had befallen. As the seemingly unending winter lengthened it soon became obvious to the people of Europe that those of wealth and privilege were better able to cope, and that the burden of suffering was being borne by the urban and rural poor.

4. The Year with no summer was well documented by the educated and wealthy, including Thomas Jefferson

In the United States, former president Thomas Jefferson left behind a record of meteorological events which was so detailed it remains in use by scholars and scientists studying the global disaster two centuries later. In modern times it is compared to scientific data acquired through means not understood in Jefferson’s day. For example, the studies of tree rings cut from trees which were alive during the catastrophe in Vermont indicate that for the period including 1816 there was little or no growth, which corresponds to the notes left by Jefferson in his Farm Book and other diaries, recording observations he made hundreds of miles to the south. Among the observations left by Jefferson are records of rainfalls, which while devastatingly heavy in some areas were scant in others, including Jefferson’s Virginia.

Jefferson wrote to Albert Gallatin towards the end of the summer of 1816 describing the shortage of rainfall which had been prevalent during the ending growing season, as well as the unseasonably cold temperatures. Jefferson, who used the records he had prepared every year since occupying his “Little Mountain” as a basis, informed Gallatin that an average normal rainfall for the month of August was 9 and 1/6 of an inch. Rainfall for August 1816 had been less than one inch; “we had only 8/10 of an inch, and still it continues”. He also noted the continuing cold weather conditions, including the frosts well to the north of Virginia, of which he had learned through his voluminous correspondence. Yet not Jefferson, nor any other student of science or the weather of the time, was able to postulate the global disaster had been due to a natural event, occurring many thousands of miles away.

3. In England, the army was called out to crush urban uprisings of the starving

England, which had been instrumental in the formation of the coalitions which crushed Napoleon, was particularly hard hit by the lack of a growing season. Unable to feed itself with the best of harvests, England found its own crops devastated by the adverse weather and its trading partners unable to provide food in sufficient quantities to make them affordable for most of its population. England had already endured years of shortages as the nation threw its might behind the wars with Napoleon, and the people by 1816 had had enough. As early as in the spring of 1816 food and grain riots were experienced in the west counties. In the town of Ely armed mobs locked up the local magistrates and fought the militia which mustered to rescue them.

By the following spring mobs in the urban centers of the midlands were common. Ten thousand armed and angry people rioted in Manchester that March. The summer of 1817 saw the British Army called to quell riots and other uprisings in England, Scotland, and Wales, while the transports to the newly established penal colonies were increased. Local landlords and magistrates often ignored the pleas of the authorities in London, establishing their own mini-fiefdoms through the promises of bread and grain. In England, as well as on the European continent, demands from the wealthier classes led to an increase in more authoritarian governments and the subsequent loss of civil liberties – such as they were at the time – in response to the international demand for food. On the other side, the suspicion that governments were hoarding food and grain at the expense of the poor led to a rise in radical thought, especially in France and the German principalities.

2. The Great Migration from New England to the west began in 1816

 

Most history books attribute the movement of the American agricultural population to the west following the War of 1812 to the end of the threat from the Indian tribes formerly supported by their British allies. The end of British influence was no doubt part of the mass migration, but it takes more than just the potential of new lands to uproot families from farms held by their ancestors for generations. The catastrophic crop failures which began in 1816 were a large part of the motivation for the movement to the west, as indicated by the massive depopulation of the New England states which began during the Year with no Summer. Particularly hard hit were Vermont and New Hampshire, as residents packed up and left for the west. For many of them, it was a journey away from divine punishment, a new exodus to a promised land, a view encouraged from pulpits.

family from Vermont was one of them, which headed to the west into the lands which are now upstate New York, Indian Territory before the American victory during the War of 1812. The move coincided with a religious revival across America which became known as the Second Great Awakening, a return to the fundamentalism which had protected Americans from the ravages of an angry God, in the view of many. The family which settled for a time in New York were the Smiths, of Sharon, Vermont. While in their new home one of them, a son named Joseph, experienced the visions which eventually led to his discovery of the Book of Mormon. Without a rational explanation for the seemingly apocalyptic weather, divine explanations sufficed, not only among the Smith family, but with thousands of families fleeing what they were unable to understand, in search of an explanation and deliverance.

1. During the global cooling, the Arctic experienced warming and ice melt

As nearly all of the Northern Hemisphere in the climes occupied by humans felt decreased temperatures and abnormal rain patterns, the Arctic, including the ice cap, experienced a sharp increase in temperature which led to a melting of the ice at the top of the world. The receding ice cap allowed explorers, especially those from the United States and Great Britain, to travel deeper than ever before into the polar region, using waterways which until then had been unwelcoming sheets of ice. Since the days of Henry Hudson and the earliest English exploration of North America, the quest for the fabled Northwest Passage had occupied the minds of explorers and adventurers, and the opportunity presented by changing weather conditions was too good to pass up. 1818 was the first year in a new series of English led Polar Expeditions which continued for most of the 19th century.

Among them was an expedition led by Englishman John Ross which included a counter-clockwise navigation around Baffin Bay, which had the salutary effect of opening the waters for the exploitation of whaling ships. Though the Northwest Passage eluded him, as it did so many others over history, the boon to the whaling industry was immediate, and whalers from Great Britain and the United States were soon delivering the fine oil for illumination to ports around the world. By 1820 the effects of the Year with no Summer were relegated to history, a part of family lore in which elders described to children the weather events of the past as far more consequential than those of the current day. Unknown to them, the real effects continued for decades, and in some ways continue to this day.


No Summer, No Vacation, No Fun, No Kidding –

WIF Into History

Cold Hard Facts About the Ice Age – WIF Current Events

Leave a comment

 Stone Cold Facts

About

the Ice Age

Even though it’s hard to see it, our planet is in a continuous state of change. Continents constantly shift and clash with each other. Volcanoes erupt, glaciers expand and recede, and life has to keep up with all of it. Throughout its existence, Earth has at various times been covered by miles-high polar ice sheets and alpine glaciers, in periods that lasted for millions of years. Generally characterized by a long-term cold climate and ice as far as the eye can see, these Ice Ages will be the topic of discussion in today’s list.

10. What is an Ice Age?

 

Believe it or not, defining an Ice Age is not as straightforward as some may think. Sure, we can characterize it as a period in which global temperatures were much lower than they are today, and where both hemispheres are covered in huge sheets of ice that extend for thousands of miles towards the Equator. The problem with this definition, however, is that it analyzes any given Ice Age from today’s perspective, and doesn’t actually take the entire planetary history into account. Who’s to say, then, that we’re not actually living in a cooler period than the overall average? In which case, we would actually be in an Ice Age right now. Well, some scientists, who’ve dedicated their lives to the study of these sorts of phenomena,can say. And yes, we’re actually living in an Ice Age, but we’ll get to that in a moment.

A better description of an ice age would be that it’s a long stretch of time in which both the atmosphere and the planet’s surface have a low temperature, resulting in the presence of polar ice sheets and mountainous glaciers. These can last for several million years, during which time there are also periods of glaciation, characterized by ice sheet and glacier expansion over the face of the planet, and interglacial periods, where we would have an interval of several thousand years of warmer temperatures and receding ice. So, in other words, what we know as “the last Ice Age” is, in fact, one such glaciation stage, part of the larger Pleistocene Ice Age, and we’re currently in an interglacial period known as the Holocene, which began some 11,700 years ago.

9. What causes an Ice Age?

 

At first glance, an Ice Age would seem to be like some sort of global warming in reverse. But while this is true to a certain extent, there are several other factors that can initiate and contribute to one. It’s important to note that the study of Ice Ages is not that old, nor is our understanding complete. Nevertheless, there is some scientific consensus on several factors that do contribute to the onset of an Ice Age. One obvious element is the level of greenhouse gases in the atmosphere. There is consistent evidence that the concentration of these gases in the air rises and falls with the retreat and advance of ice sheets. But some argue that these gases don’t necessarily kick start every Ice Age, and only influence their severity.

Another key factor that plays a part here are tectonic plates. Geological records point to a correlation between the position of the continents and the onset of an Ice Age. This means that, in certain positions, continents can obstruct the so-called Oceanic Conveyor Belt, a global-scale system of currents that bring cold water from the poles down to the Equator and vice versa. Continents can also sit right on top of a pole, as Antarctica does today, or can make a polar body of water become completely or semi-landlocked, similar to the Arctic Ocean. Both of these favor ice formation. Continents can also bulk up around the Equator, blocking the oceanic current – leading to an Ice Age. This happened during the Cryogenian period when the supercontinent Rodinia covered most of the Equator. Some specialists go even as far as saying that the Himalayas played a major role in the the current Ice Age. They say that after these mountains began forming some 70 million years ago, they increased the amount of global rainfall, which in turn led to a steady decrease of CO2 from the air.

Lastly, we have the Earth’s orbits. These also partially account for the glacial and interglacial periods within any given Ice Age. Known as the Milankovitch Cycles, the Earth experiences a series of periodic changes while circumnavigating the Sun. The first of these cycles is Earth’s eccentricity, which is characterized by the shape of our planet’s orbit around the Sun. Every 100,000 years or so, Earth’s orbit becomes more or less elliptical, meaning that it will receive more or less of the Sun’s rays. The second of these cycles is the axial tilt of the planet, which changes by several degrees every 41,000 years, on average. This tilt accounts for the Earth’s seasons and the difference in solar radiation between the poles and the equator. Thirdly, we have Earth’s precession, which translates to a wobble as Earth spins on its axis. This happens roughly every 23,000 years, and will cause winter in the Northern Hemisphere to happen when Earth is farthest away from the Sun, and summer when it’s closest. When this happens, the difference in severity between seasons will be greater than it is today. Besides these major factors, we also have the occasional lack of solar spots, large meteor impacts, huge volcanic eruptions, or nuclear wars, among other things, that can potentially lead to an Ice Age.

8. Why do they last so long?

 

We know that Ice Ages usually last for millions of years at a time. The reasons behind this can be explained through a phenomenon known as albedo. This is the reflectivity of the Earth’s surface when it comes to the Sun’s shortwave radiation. In other words, the more our planet is covered in white ice and snow, the more of the Sun’s radiation is reflected back into space, and the colder it gets. This leads to more ice and more reflectivity – in a positive feedback cycle that lasts for millions of years. This is one of the reasons why it’s so important for Greenland’s ice to remain where it is. Because if it doesn’t, the island’s reflectivity will decrease, adding to the overall global temperature increase.

Nevertheless, Ice Ages do eventually come to an end, and so do their glacial periods. As the air becomes colder, it can no longer hold as much moisture as it did before, leading, in turn, to less snowfall and the eventual impossibility for the ice to expand or even replenish itself. This starts a negative feedback cycle that marks the beginning of an interglacial period. By this logic, a theory was proposed back in 1956 which hypothesized that an ice-free Arctic Ocean would actually cause more snowfall at higher latitudes, above and below the Arctic Circle. This snow may eventually be in such great quantities that it will not melt during the summer months, increasing Earth’s albedo and reducing the overall temperature. In time, this will allow ice to form at lower altitudes and mid-latitudes – kick starting a glaciation event in the process.

7. But how do we really know Ice Ages even exist?

 

The reason people began thinking about Ice Ages in the first place was because of some large boulders located seemingly in the middle of nowhere, and with no explanation as to how they got there. The study of glaciation started during the mid-18th century, when Swiss engineer and geographer Pierre Martel began documenting the erratic dispersal of rock formations inside an Alpine valley, and downhill from a glacier. The locals told to him that those huge boulders were pushed there by the glacier that once extended much farther down the mountain. Over the decades, many other similar features were documented around the world, forming the basis for the theory of Ice Ages. Since then, other forms of evidence have been taken into account. The geological features, among which are the previously mentioned rock formations, also contain moraines, carved valleys such as fjords, glacial lakes, and various other forms of land scarring. The problem with these, however, is that they’re extremely hard to date, and successive glaciations can distort, or even completely erase the previous geological formations.

6. The Big Ice Ages

 

At the moment, scientists are confident that there were five major Ice Ages throughout Earth’s long history. The first of them, known as the Huronian glaciation, happened roughly 2.4 billion years ago and lasted for about 300 million years, and is considered the longest. The Cryogenian Ice Age happened around 720 million years ago, and lasted until 630 million years ago. This one is considered to be the most severe. The third massive glaciation took place about 450 million years ago and lasted some 30 million years. It’s known as the Andean-Saharan Ice Age, and caused the second largest mass extinction in Earth’s history, after the so-called Great Dying. Lasting for 100 million years, the Karoo Ice Age happened between 360 and 260 million years ago, and was caused by the appearance of land plants, whose remains we now use as fossil fuels.

Lastly, we have the Pleistocene Ice Age, also known as the Pliocene-Quaternary glaciation. It began roughly 2.58 million years ago and has since gone through several glacial and interglacial periods, roughly 40,000 to 100,000 years apart. Over the past 250,000 years, however, the climate changed more frequently and abruptly, with the previous interglacial period being interrupted by numerous cold spells that lasted for several centuries at a time. The current interglacial that began roughly 11,000 years ago is atypical because of the relatively stable climate it has had up until this point. It’s somewhat safe to say that humans may have not been able to discover agriculture and develop its current level of civilization if it wasn’t for this unusual period of temperature stability.

5. Witchcraft

“Wait, what?” We know that’s what you’re thinking when you see that header in this list. But let us explain…

For a period of several centuries, beginning sometime around 1300 and ending around 1850, the world went through a period known as the Little Ice Age. Several factors worked together to lower the overall temperature, particularly in the Northern Hemisphere, allowing many alpine glaciers to expand, rivers to freeze over, and crops to fail. Several villages in Switzerland were completely destroyed by the encroaching glaciers during the mid-17th century, and in 1622, even the southern section of the Bosporus Strait, around Istanbul, had completely frozen over. Things got worse in 1645 and lasted for the following 75 years, in a period known to scientists today as the Maunder Minimum.

During that time, the Sun was going through a period with little to no sunspots. These sunspots are regions on the surface of the Sun that are much lower in temperature. They are caused by concentrations in our star’s magnetic field flux. By themselves, these spots would probably be able of lower Earth’s temperature, but they’re also surrounded by some intensely-bright regions, known as faculae. These have a significantly higher radiation output that far outweighs the reduction caused by sunspots. So, a spot-free Sun actually has a lower radiation output than usual. During the 17th century, it’s estimated that the Sun dimmed by 0.2 percent – something which partially accounted for this Little Ice Age. Over 17 volcanic eruptions took place across the world during that time, dimming the sun’s rays even further.

Economic adversity brought on by this several-century-long cold spell had an incredible psychological impact on people. Frequent crop failures and firewood shortages led many from Salem, Massachusetts to suffer from a severe case of mass hysteria. In the winter of 1692, twenty people – fourteen of which were women – were hung on accusations that they were witches and to blame for everyone’s hardships. Five other people – two children included – later died in prison for the same thing. Because of unfavorable weather, some people in places like Africa occasionally accuse each other of being witches, even to this day. In other places, however, gay people are the scapegoats for the effects of global warming.

4. Snowball Earth

Earth’s first Ice Age was also its longest. As we mentioned earlier, it lasted a whopping 300 million years. Known as the Huronian Glaciation, this incredibly long and freezing epoch happened some 2.4 billion years ago, in a time when only single-celled organisms roamed the Earth. The landscape would have looked completely different than today, even before the ice took over. A series of events, however, happened that would eventually lead to an apocalyptic event of global proportions, engulfing much of the planet in a thick sheet of ice. Life prior to the Huronian Glaciation was dominated by anaerobic organisms that didn’t require oxygen to live. Oxygen was, in fact, poisonous to them, and extremely rare in the air at the time, making up just 0.02% of the atmospheric composition. But at some point, a different form of life evolved – the Cyanobacteria.

This tiny bacterium was the first being to ever make use of photosynthesis as a means of generating its food. A byproduct of this process is oxygen. As these tiny creatures thrived in the world’s oceans, they pumped millions upon millions of tons of oxygen, raising its concentration in the atmosphere to 21%, and almost driving the entire anaerobic life into extinction. This event is known as The Great Oxygenation Event. The air was also full of methane, and in contact with oxygen it turns into CO2 and water. Methane, however, is 25 times more potent as a greenhouse gas than CO2, meaning that this transformation led to a drop in overall temperatures – which, in turn, began the Huronian Glaciation and the first mass extinction on Earth. The occasional volcano added further CO2 into the air, resulting in periodic interglacials.

3. Baked Alaska

 

If its name wasn’t clear enough, the Cryogenian Ice Age was the coldest period in Earth’s long history. It’s also the subject of much scientific controversy today. One topic of debate is whether the Earth was completely covered in ice, or a band of open water still remained around the equator – a Snowball, or Slushball Earth, as some call the two scenarios. The Cryogenian lasted from roughly 720 to 635 million years ago, and can be divided into two major glaciation events known as theSturtian (720 to 680 Ma) and the Marinoan (approximately 650 to 635 Ma). It’s important to note that there were no forms of multi-cellular life at that point, and some speculate that one such Snowball or Slushball Earth scenario was an early catalyst for their evolution during the so-called Cambrian explosion.

A particularly interesting study was published back in 2009, focusing on the Marinoan glaciation in particular. According to the analysis, Earth’s atmosphere was relatively warm, while its surface was covered in a thick layer of ice. This can only be possible if the planet was entirely, or almost entirely, covered in ice. They compared the phenomenon to a Baked Alaska dessert – where the ice cream doesn’t immediately melt when it’s placed in the oven. It turns out that the atmosphere had plenty of greenhouse gases in its composition, but that didn’t stop or mediate the Ice Age as we would expect. These gasses were present in such great quantities because of increased volcanic activity due to the breakup of the Rodinia supercontinent. This long volcanism is also thought to have helped start the Ice Age.

The science team warned us, however, that something similar could happen again if the atmosphere reflected too much of the Sun’s rays back into space. One such process could be triggered by a massive volcanic eruption, nuclear war, or our future attempts at mitigating the effects of global warming by spraying the atmosphere with too many sulphate aerosols.

2. Flood Myths

 

When the glacial ice began to melt some 14,500 years ago, the water didn’t flow to the ocean in a uniform pattern across the globe. In some places like North America, a huge proglacial lake began to form. These lakes are a result of damming, either by a moraine or an ice wall. In 1,600 years’ time, Lake Agassizcovered an estimated area of 170,000 sq. miles – larger than any lake currently in existence. It formed over parts of North Dakota, Minnesota, Manitoba, Saskatchewan, and Ontario. When the dam finally gave in, fresh water flooded into the Arctic Ocean via the Mackenzie River Valley. This great influx of fresh water weakened the oceanic current by up to 30%, plunging the planet into a 1,200-year-long period of glaciation known as the Younger Dryas. This unfortunate turn of events is suspected to have killed off the Clovis culture and the North American megafauna. Records also show that this cold spell came to an abrupt end some 11,500 years ago, with temperatures in Greenland rising by 18 degrees F in a mere decade.

During the Younger Dryas, the glacial ice replenished itself, and when the planet began to warm up again, Lake Agassiz also reappeared. This time, however, it joined with an equally large lake, known as Ojibway. Shortly after their merger, a new drainage took place, but this time in the Hudson Bay. Another cold spell happened 8,200 years ago, known as the 8.2 kiloyear event. Though cold temperatures lasted for only 150 years, this incident was able to raise sea levels by 13 feet. Interestingly, historians were able to link the origins of many flood myths from around the world to this exact time period. This sudden rise in sea levels also caused the Mediterranean to punch its way through the Bosporus Strait and flood the Black Sea, which at the time was only a freshwater lake.

1. Martian Ice Age

Influenced by forces beyond our control, Ice Ages are naturally occurring events that aren’t confined to Earth alone. Like our own planet, Mars also goes through periodical changes in its orbit and axial tilt. But unlike Earth, where an Ice Age implies polar ice caps growing in size, Mars experiences a different process. Because its axial tilt is more pronounced than Earth’s, and the poles receive more sunlight, a Martian Ice Age means that polar ice caps actually recede, while glaciers at the mid-latitude expand. This process is reversed during interglacial periods.

For the past 370,000 years, Mars has been slowly coming out of its own ice age and entering an interglacial period. Scientists estimate that roughly 20,900 cubic miles of ice has been accumulating at the poles since, most of it being in the Northern Hemisphere. Computer models have also shown that Mars has the capacity of being totally enveloped in ice during a glaciation event. This research is in its early stages, however, and given the fact that we’re still a long way away from fully understanding Earth’s own Ice Ages, we can’t logically expect to know everything that’s happening on Mars. Nevertheless, this research can prove useful, given our future plans for the Red Planet. It also helps us a great deal here on Earth. “Mars serves as a simplified laboratory for testing climate models and scenarios, without oceans and biology, which we can then use to better understand Earth systems,” said planetary scientist Isaac Smith.


Cold Hard Facts About the Ice Age

– WIF Current Events