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Arctic Atmosphere Very Clean This Year

Date:
April 12, 2007
Source:
Alfred Wegener Institute for Polar and Marine Research
Summary:
Scientists are examining the Arctic atmosphere, specifically, small suspended particles, so-called aerosols, and clouds in order to improve our understanding of the radiation dynamics in the atmosphere, and their impact on climate. Aerosols represent minute airborne substances which, through absorption or reflection of solar radiation have a direct influence on the climate.
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The research aircraft Polar 2 of the Alfred Wegener Institute.
Credit: Andreas Herber, Alfred Wegener Institute

Under the direction of two of the Helmholtz Centres, i.e. the Alfred Wegener Institute for Polar and Marine Research and the German Aerospace Center, an international research group is currently investigating the Arctic atmosphere above Spitsbergen. Aim of this year’s ASTAR 2007 project (Arctic Study of Tropospheric Aerosol, Clouds and Radiation) is an accurate description of the Arctic atmosphere during spring.

Until April 17, scientists from nine countries will examine the Arctic atmosphere, specifically small suspended particles, so-called aerosols, and clouds in order to improve our understanding of the radiation dynamics in the atmosphere, and their impact on climate. Aerosols represent minute airborne substances which, through absorption or reflection of solar radiation have a direct influence on the climate.

In addition, they may have indirect climate effects by acting as crystallisation nuclei in the formation of clouds.  Furthermore, the data collected during this campaign will provide an important contribution to assessment of data from the satellite CALIPSO. Since April 28, 2006, this satellite has been travelling in a polar orbit, observing clouds and aerosols above the Arctic from space.

Measurements will be carried out using research aircraft of the Alfred Wegener Institute (Polar 2), and of the German Aerospace Center (Falcon). Both aircraft are taking off and landing in Longyearbyen, and flights are synchronised with the flight path of the satellite CALIPSO above. In the research town of Ny-Ålesund, 120 kilometres away, researchers support the campaign through ground-based measurements.

First results from recording flights to date indicate that, compared to previous years, the Arctic atmosphere this year is very clean. Nevertheless, at several kilometres altitude, pollution residues from Central and Eastern Europe were detected. The data collected during ASTAR 2007 will aid in the evaluation of CALIPSO measurements, and will improve our understanding of transport of air-masses between the Arctic and temperate latitudes.

The ASTAR project is supported by the German Research Foundation, the Japanese Ministry of Education, Science, Sports, and Culture, the Swedish Polar Research Secretariat, and the French Polar Research Institute IPEV as part of the French-German Arctic Research Base.


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Alfred Wegener Institute for Polar and Marine Research. "Arctic Atmosphere Very Clean This Year." ScienceDaily. ScienceDaily, 12 April 2007. <www.sciencedaily.com/releases/2007/04/070412100253.htm>.
Alfred Wegener Institute for Polar and Marine Research. (2007, April 12). Arctic Atmosphere Very Clean This Year. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2007/04/070412100253.htm
Alfred Wegener Institute for Polar and Marine Research. "Arctic Atmosphere Very Clean This Year." ScienceDaily. www.sciencedaily.com/releases/2007/04/070412100253.htm (accessed May 23, 2017).

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