9. Antarctica is the largest desert on earth, almost twice the size of the Sahara Desert.
When most people imagine Antarctica they think of a cold continent covered in ice. And they’re right. In fact, 90% of the world’s freshwater is locked up in Antarctica’s permanent ice sheet. By contrast, the idea of the desert usually conjures images of rippled sand dunes and the shimmering heat of the Sahara. So how is it possible that a cold, ice-covered continent like Antarctica is a desert?
Why is Antarctica a desert?
A desert is defined by the amount of precipitation (rain, snow, mist and fog) in an area. A region that receives very little precipitation (the exact amount depends on who you ask) is classified as a desert. There are many types of deserts, including subtropical, coastal and polar deserts. What they all have in common is a barren, windswept landscape, which makes it difficult for plants and animals alike to gain a foothold on land. This all certainly applies to Antarctica.
The average yearly rainfall at the South Pole over the past 30 years was a tiny 10 mm (0.4 in). Most of the continent is covered by ice fields carved by the wind, and craggy mountains covered in glaciers. While Antarctica is home to wonderful forests of low-lying mosses and lichens, there are only two flowering plants that can survive the harsh conditions. And most of the animals we encounter – penguins, seals, whales and seabirds – rely on seafood for sustenance.
Is there a desert in Antarctica, or is Antarctica a desert?
While most deserts only cover part of a continent, the Antarctic Polar Desert spans the whole of Antarctica. It snows and rains on the coastal Antarctic Peninsula, but in the McMurdo Dry Valleys in East Antarctica, it never rains. In fact, scientists believe that in some parts of the Dry Valleys it hasn’t snowed or rained for 14 million years! So although the coast sees some precipitation, the average across the continent is low enough to classify all of Antarctica as a polar desert.
How much of Antarctica is covered in ice?
Approximately 98% of the Antarctic continent is covered by a permanent ice sheet. This beautiful and wild expanse of ice covers an incredible 14 million km² (5.4 million square miles). That’s about the same area as the United States and Mexico combined!
At its deepest, Antarctica’s ice is 4.5km (2.7 miles) thick. If it melted, global sea levels would rise about 60 m (200 ft). That’s a lot of ice. And due to Antarctica’s desert conditions, it has taken an impressive 45 million years for it to grow to its current thickness.
How much precipitation does Antarctica receive annually?
The interior is very dry and rarely sees clouds. Here, the annual precipitation averages around 50 mm (1.9 in), and most of this falls as snow or ice crystals. This gives rise to some of the most ethereal weather conditions you can see on earth including frost flowers, solar haloes and polar stratospheric clouds.
By contrast, the coast has a maritime climate influenced by the ocean and it’s quite common to see low clouds and mist clinging to the craggy mountains. The Antarctic coastline can receive more than 200 mm (7.8 in) of precipitation each year.
On the Antarctic Peninsula, which travellers can visit in the summer months, it’s quite possible to see snow, rain and sunshine in one day. Some northern parts of the Antarctic Peninsula receive 500 mm (19.7 in) between October and March, and on nearby subantarctic islands this can double, with 1000 mm (39.4 in) each year! That’s why we make sure that everyone on our voyages has a top notch, complimentary polar expedition jacket. These jackets are water and wind-resistant, so you’ll be protected from the elements whatever the weather. https://www.aurora-expeditions.com/blog/is-antarctica-a-desert/