Antarctica’s Ice Cores Hold A Climate Record For The Planet
More than a million years’ worth of information on the earth’s climate is recorded in Antarctica’s ice. Scientists who drill ice cores can decipher the data contained in them in order to learn secrets about the history of our planet.
That data comes in the form of soil, patterns in the ice, and even samples of atmospheric contents that reveal the gases present on earth. Studying these ice cores reveals information about how the content of the atmosphere has changed over time, how the earth’s soil developed, and much, much more.
Scientists Are Learning What Changes Are Natural And What Changes Are Made By Humans
The earth is always changing; atmospheric conditions, weather patterns, water, everything is continuously in fluctuation. One challenge today is understanding how many of those changes that are occurring today are natural processes and how many are caused by human activity.
The pristine environment of Antarctica, which has been mostly untouched by humans (except for explorers and researchers), helps researchers differentiate between natural changes and human-made changes. What they are finding is that the vast majority of the rapid environmental changes that are occurring today are the direct result of human activity, especially the burning of fossil fuels.
To get a clear picture of the night sky, astronomers need dry weather and, ideally, a high altitude. Antarctica has both. Even better, it has insanely long winter nights that, at their worst, can last for a full two months! Talk about an ideal place for stargazing.
The environment in Antarctica enables astronomers to examine the stars, planets, galaxies, and other celestial bodies with almost as much precision as a space telescope! Yet because they do not have to build a space telescope and launch it into orbit, they can conduct their research for much, much cheaper.
The experience of being able to research Antarctica is genuinely unique. Scientists can look into some of the most pristine – and beautiful – environments on the entire planet to understand problems and challenges in original and ground-breaking ways.
Imagine doing one research tour in Antarctica and then being able to tell people for the rest of your life that you lived in Antarctica! Researchers who have worked there get bragging rights for the rest of their lives, in addition to being able to say that they were a part of something amazing.
Living quarters for researchers working in Antarctica are not nearly as homey as conditions for those living and working in other parts of the world. While many scientists can go home to their houses in the suburbs, researchers in Antarctica lived in dormitory-style settings. Some even live on ships.
These scientists can go for weeks at a time without getting any personal or alone time, mainly because being alone in Antarctic weather can mean certain death. They have long work hours and close sleeping quarters, meaning that there is very little time or opportunity for socializing.
Mining towns emerged in history as a means of housing a large population that moved to an area to work in a mine that had just been opened. Many of the workers left behind their families, as conditions were too difficult for women and children. Many people lived in tents, and there were very few opportunities for entertainment.
Researchers in Antarctica have some free time, during which they may go to the coffee shop or bar on their station. They may even play trivia or watch a movie together. Nevertheless, everyone is living in a temporary situation, so all of the researchers know that their time together and the relationships that they form are temporary. Furthermore, no children are allowed, so many have to leave their families behind.
Polar weather is notoriously difficult to predict and can be incredibly unstable. Wind and snowstorms can spring up in a matter of minutes and turn a clear day into an unnavigable nightmare. Researchers have to carry emergency equipment with them, including tents, in case a sudden storm causes them to get stranded.
Upon arrival, researchers in Antarctica have to undergo survival training to prepare them for the harsh realities of extreme polar weather. Survival in Antarctica has more to do with braving the elements than learning to hunt your food, as much of the continent is devoid of wildlife.
They Have Very Strict Protocols To Avoid Contamination
Preservation of Antarctica’s pristine environment is of the utmost concern for researchers who live on the frozen continent. Moreover, they go to some pretty extreme measures, including having to send human waste back to their own countries for disposal! That’s right; they have to use toilets that are equipped to have the contents sent back home.
They also have to make sure that they carry out their experiments and research in such a way that disrupts the environment as little as possible. The researchers who work in Antarctica have to make some pretty serious sacrifices and commitments in order to make life there work.
Almost all of Antarctica is completely frozen – at least it was before global warming began to transform the landscape. Some isolated areas are not covered with snow and ice, usually because they receive no precipitation, and winds have blown all of the snow away.
Yet not all of the water in Antarctica is locked away in ice, as researchers have discovered some freshwater lakes underneath the Antarctic glaciers. They have surprised scientists and led to a series of remarkable discoveries that seem to be genuinely out of this world. Nevertheless, they are not out of this world. They are real, and they are on our planet.
The water in the subglacial lakes is at about freezing but is just warm enough to flow around in a liquid state. This is because the immense pressure of the ice – which is often over a mile thick – is so intense that it warms the water on the very bottom.
Additionally, the warmth of magma that flows underneath the earth’s crust comes from below the lakes and causes the water to warm, just enough to be in a liquid state. So they aren’t exactly hot springs, but they exist in a sub-frozen state that only enables them to flow around and be considered freshwater lakes.
The Southern Ocean surrounds much of Antarctica and contains many kinds of polar wildlife, including whales, seals, and micro-organisms. The Southern Ocean is full of icebergs that have broken off of Antarctic glaciers and ice sheets, so it can be complicated for a ship to navigate.
The water in the subglacial lakes of Antarctica flows in such a way that it pools together and streams down, underneath the glaciers, into the Southern Ocean. This freshwater that flows into a salty ocean has some impact on coastal wildlife, and the effects are something that researchers are trying to understand.
The Subglacial Lakes Have An Otherworldly Appearance
The lakes that exist underneath Antarctica’s glaciers bear no resemblance to anything that we are aware of on this earth. Researchers who study them have likened their appearance to extraterrestrial landscapes because the structures and formations in them are so unique. In fact, studying them may provide insight into astrobiology, the field that studies the possibility of life on other planets.
The lakes are lined with ice that is full of bubbles, giving them an ethereal appearance that seems like it is out of this world. They are also very dark and very, very cold.
The lakes lie underneath glaciers that can be a mile thick or more. While ice may have a clear appearance in minimal amounts, this dense layer of ice has an opaque appearance that is solid white all the way through. You cannot see through a glacier.
As a result, no sunlight can reach the subglacial lakes. They are pitch black, so photosynthesis – the process whereby plant and some microbial life forms synthesize energy from sunlight – is unable to happen there. By all accounts, there should not be any life that exists down there.
There are abundant signs of life in the subglacial lakes, but none of the macro-organisms that we are familiar with. There are no penguins, fish, whales, or even plants such as seagrass or kelp. All of life is microbial, and it seems to be thriving.
Microbial life is incredibly resilient and can thrive in some of the harshest, most unforgiving climates on the planet. Evidence of the microbial life in Antarctica’s subglacial lakes is seen in the chemical composition, which includes the chemical byproducts of life processes that including eating, eliminating waste, and dying.
The fossil water inside the subglacial lakes has high levels of dissolved minerals, which support the microbial lifeforms that live there. The minerals include carbon and other nutrients, which affect the chemical composition of the coastal areas of the Southern Ocean.
The lakes periodically drain out into the Southern Ocean and then are filled again by the water that flows and collects together. As the water flows out into the ocean, the minerals flow out and join the salty Southern Ocean. As more water flows in, the minerals recollect. The carbon levels can replenish themselves within 4.8 to 11.9 years.
Scientists have concluded that the movement of magma underneath the earth’s crust causes the tectonic plates on the surface to move. They slide around on the ocean of magma, so slowly that the movements are imperceptible but measurable over the long term.
A very similar scenario exists between the subglacial lakes and surface ice sheets. As the water flows around and drains into the Southern Ocean, the ice moves around. This movement causes the lake water to flow even more rapidly; this relationship between the lakes and the glaciers can actually be seen by measuring surface ice.
While finding one of these subglacial lakes would certainly be extraordinary, as of 2018, researchers had identified 379 of them! What this means is that they may be much more ordinary than scientists had initially thought, and estimates say that we are sure to discover many, many more.
Scientists have been finding the lakes by using radiography; they discovered the first one in 1970. The largest known subglacial lake is Lake Vostok; it is hundreds of meters deep, 50 kilometers across, and 240 kilometers long! Some areas have higher concentrations of lakes because of their unique geography, which is more conducive to lake formation.
They May Have Been In Existence For 35 Million Years Or More
The subglacial lakes of Antarctica have some of the most extreme conditions on the entire planet. The immense pressure upon the water affects the temperature at which water freezes, making them more akin to alien liquid bodies than other water bodies on earth.
These lakes are incredibly old; some estimates say that they may be 35 million years old or more! They have been a longstanding feature of Antarctica’s landscape and have been affecting the ice sheets in ways that scientists are only now beginning to understand.
Scientists In Antarctica Also Study The Continent’s Wildlife
There are very few land animals that live in Antarctica. The largest animal that lives solely on the land there is a flightless bird known as Belgica Antarctica, and it is only one-quarter of an inch in size! Most of its wildlife, including its penguins, is considered to be marine.
The wildlife of Antarctica includes killer whales, blue whales, and other large marine mammals that thrive in icy water, as well as seals and colossal squids. Many different types of penguins live there, including emperor penguins, southern rockhopper penguins, king penguins, Gentoo penguins, and chinstrap penguins.
While the wildlife in Antarctica is spectacular, large animals only occupy a tiny portion of the continent – mostly along its coastline. Its smaller lifeforms include phytoplankton, mites, nematodes, lice, tardigrades, springtails, krill, and rotifers.
However, most of the life that lives on Antarctica is microbial. Algae are abundant, including microscopic diatoms. Some bacteria, in particular, favor the frigid conditions, as they have been found living as deep as 2600 feet underneath the ice. Microbial life is incredibly resilient and can thrive in some of the harshest conditions on the planet, where scientists least expect to find any living thing.
Geologic evidence suggests that tundra vegetation, including some forests, covered parts of Antarctica until as recently as about 15 million years ago. However, its inhospitable climate has made plant life there extremely rare. Plants in Antarctica consist mostly of mosses and liverworts, which are primitive plants that do not have a vascular system,
Some flowering plants live in a few places along Antarctica’s coastline, and they only grow for a few weeks out of the summer. Researchers who study plant life in Antarctica can learn about some of the conditions on earth in its distant past.
Researchers have identified approximately 1150 different types of fungi in Antarctica. Many of these fungi are very primitive, with very simple morphology, low metabolisms, and undifferentiated structures. These primitive features make them ideally suited to life in the frozen Antarctic tundra.
Fungi in Antarctica are so abundant that they have had a noticeable impact on some of the rock formations there. Scientists who study the fungi estimate that they may have qualities and features similar to extraterrestrial life on places such as Mars. Studying these unique forms of life helps provide a window into both early conditions of life on earth and what life may be like if it exists elsewhere in the universe.
Sources: “50 Amazing Facts About Antarctica,” by Andrea Thompson. Live Science. March 10, 2014. “Scientists Reveal What Living and Working in Antarctica Is Really Like,” by Jesslyn Shields. How Stuff Works. February 2, 2017. “Almost alien: Antarctic subglacial lakes are cold, dark and full of secrets.” Science Daily. March 4, 2020. “Antarctica.” Wikipedia.