Journal Highlights

Arctic Clouds Highly Sensitive to Air Pollution

Press Release—

A new study finds air in the Arctic is extraordinarily sensitive to pollution and particulate matter may spur Arctic cloud formation.

In 1870, explorer Adolf Erik Nordenskiöld, trekking across the barren and remote ice cap of Greenland, saw something most people wouldn’t expect in such an empty, inhospitable landscape: haze.

Nordenskiöld’s record of the haze was among the first evidence that air pollution around the northern hemisphere can travel toward the pole and degrade air quality in the Arctic. Now, a new study finds that the air in the Arctic is extraordinarily sensitive to air pollution, and that particulate matter may spur Arctic cloud formation.

These clouds can act as a blanket, further warming an already-changing Arctic, according to Tim Garrett, an atmospheric scientist at the University of Utah and a co-author of the new study published online in Geophysical Research Letters, a journal of the American Geophysical Union....more

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Featured Special Collection

A Census of Atmospheric Variability from Seconds to Decades 

The atmosphere varies naturally on all length scales from millimeters to thousands of kilometers, and on all time scales from seconds to decades and longer.  This special collection of Geophysical Research Letters synthesizes and summarizes that variability through a phenomenological census.  The collection brings together some of the most influential and definitive papers to have been published in this journal in recent years.  The topics covered include turbulence on time scales of seconds and minutes, gravity waves on time scales of hours, weather systems on time scales of days, atmospheric blocking on time scales of weeks, the Madden–Julian Oscillation on time scales of months, the Quasi-Biennial Oscillation and El Niño–Southern Oscillation on time scales of years, and the North Atlantic, Arctic, Antarctic, Pacific Decadal, and Atlantic Multi-decadal Oscillations on time scales of decades.  The collection is accompanied by a Commentary article, which provides an authoritative, concise, and accessible point of reference for the most important modes of atmospheric variability.

A Census of Atmospheric Variability from Seconds to Decades