Aurora in the night sky
Click on image for full size
University Corporation for Atmospheric Research
The Polar Atmosphere
Phenomena in the Polar Atmosphere
There are some unique phenomena that happen in the atmosphere that is above the Earth's polar regions. Read on to discover more about some of the unique parts of the polar atmosphere.
Aurora:High in the thermosphere layer of Earth's atmosphere, energized particles that come from the Sun follow Earth's magnetic field lines toward the Poles. The gases of the upper atmosphere light up with the added energy. The display can only be seen at high latitudes and is called the aurora borealis (Northern Lights) in the Northern Hemisphere and the aurora australis (Southern Lights) in the Southern Hemisphere.
Noctilucent Clouds: In the mesosphere layer of Earth’s atmosphere, below the thermosphere and above the stratosphere, noctilucent clouds form in the polar regions. This is much higher in the atmosphere than typical clouds, but noctilucent clouds are not typical clouds. The word noctilucent means to glow, and these clouds do glow blue in color when they are lit from below by the setting Sun.
Less Ozone: The ozone layer, located in the stratosphere layer of the atmosphere, shields our planet from harmful UV radiation. However, during the 20th Century pollutants that were used in aerosol cans and refrigeration destroyed a large amount of ozone. Most of the ozone destruction happened in the part of the stratosphere that is over Earth’s polar regions. There are now a number of ozone holes, areas where the amount of ozone is only about a third of what it used to be, including a very large hole over Antarctica.
Cold Weather: Less solar energy gets to the poles making for lots of cold weather. However, even though both poles get the same amount of sunlight, the North Pole is less cold and has different weather than the South Pole. This is because the North Pole is over the Arctic Ocean, which is less cold than Antarctica and its thick layer of ice. Antarctica is the coldest continent on Earth. It has some of the harshest weather on the planet with high winds and low precipitation. Weather events happen in the troposphere layer of Earth’s atmosphere, which is about half as thick at the poles as it is at the equator.
Patterns of the Polar Atmosphere
Changing patterns of high pressure are found in both polar regions. In the north polar region, the Northern Annular Mode is an area of high atmospheric pressure that moves between a location over the North Pole and a ring around the Pole at 45°N latitude. The changing location of the high-pressure zone causes changes in wind patterns and affects weather patterns from year to year such as how cold it will get in North America and Europe during a winter. In the south polar region, the Southern Annular Mode is similar. It involves a zone of high pressure that moves its location between the South Pole and a ring around the pole at 45°S latitude.
Shop Windows to the Universe Science Store!
The Spring 2010 issue of The Earth Scientist
, focuses on the ocean, including articles on polar research, coral reefs, ocean acidification, and climate. Includes a gorgeous full color poster!
You might also be interested in:
The thermosphere is a layer of Earth's atmosphere. The thermosphere is directly above the mesosphere and below the exosphere. It extends from about 90 km (56 miles) to between 500 and 1,000 km (311 to...more
The Earth has a magnetic field with north and south poles. The magnetic field of the Earth is enclosed in a region surrounding the Earth called the magnetosphere. As the Earth rotates, its hot core generates...more
Noctilucent clouds (NLC’s) or polar mesospheric clouds (PMC’s) are found very high in the Earth's atmosphere (about 85,300 meters above the Earth's surface!). They are called Polar Mesospheric Clouds when...more
About 90% of the ozone in the Earth's atmosphere lies in the region called the stratosphere which is found between 16 and 48 kilometers (10 and 30 miles) above the Earth's surface. Ozone forms a kind of...more
The Arctic or the Earth's Northern Polar Region is the land and ocean above 66.5 degrees latitude. As you can imagine, being that far north in latitude has certain implications on Arctic weather! Ok, so...more
Antarctica is unique. It is the coldest, windiest, and driest continent on Earth. The land is barren and mostly covered with a thick sheet of ice. Antarctica is almost entirely south of the Antarctic Circle...more
The cryosphere includes the parts of the Earth system where water is in its frozen (solid) form. This includes snow, sea ice, icebergs, ice shelves, glaciers, ice sheets, and permafrost soils. Approximately...more