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Light absorbing properties of particles extracted from snow samples

Linke, Claudia; Ibrahim, Inas; Waitz, Fritz; Kiselev, Alexei; Rehm, Till; Leisner, Thomas; Schaiter, Martin

Abstract:
Although BC is the dominating absorbing component in the atmosphere, there is evidence of numerous other aerosol components which are able to contribute to the aerosol light absorption. Such non-BC particles include mineral dust, volcanic ash, brown carbon as well as biological debris. Sooner or later different physical processes remove these airborne particles from the atmosphere and deposit them on the ground. If they are deposited on snow or ice surfaces these particles might induce melting processes by the absorption of solar radiation. Because snow is the most reflective natural surface on earth, already small amounts of absorptive impurities can significantly reduce the surface albedo.

The contribution of the albedo reduction on the radiative balance of the atmosphere is usually assessed based on the mass concentration of refractory BC deposited in the snow. Ignoring the absorption contribution of the non-BC aerosol components might result in an underestimation of the albedo reduction. Therefore, the knowledge of the visible absorption coefficients of aerosol particles deposited in snow and ice, is essential for a realistic evaluation of the albedo effect on regional and global climate. ... mehr

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Volltext §
DOI: 10.5445/IR/1000096792
Veröffentlicht am 24.07.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Poster
Publikationsdatum 15.05.2019
Sprache Englisch
Identifikator KITopen-ID: 1000096792
Veranstaltung 7th International Symposium on Ultrafine Particles, Air Quality and Climate (2019), Brüssel, Belgien, 15.05.2019 – 16.05.2019
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