Change search
ReferencesLink to record
Permanent link

Direct link
Elemental carbon in snow at Changbai Mountain, northeastern China: concentrations, scavenging ratios, and dry deposition velocities
Show others and affiliations
2014 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 14, no 2, 629-640 p.Article in journal (Refereed) Published
Abstract [en]

Light-absorbing aerosol - particularly elemental carbon (EC) - while mixed with snow and ice is an important climate driver from the enhanced absorption of solar radiation. Currently, considerable efforts are being made to estimate its radiative forcing on a global scale, but several uncertainties remain, particularly those regarding its deposition processes. In this study, concurrent measurements of EC in air and snow are performed for three years (2009-2012) at Changbai station, northeastern China. The scavenging ratio and the wet-and dry-deposition fluxes of EC over the snow surface are estimated. The mean EC concentration in the surface snow is 1000 +/- 1500 ng g(-1), ranging from 7 to 7640 ng g(-1). The mean value of the scavenging ratio of EC by snow is 140 +/- 100, with a median value of 150, which is smaller than that reported in Arctic areas. A non-rimed snow process is a significant factor in interpreting differences with Arctic areas. Wet-deposition fluxes of EC are estimated to be 0.47 +/- 0.37 mu g cm(-2) month(-1) on average over the three snow seasons studied. Dry deposition is more than five times higher, with an average of 2.65 +/- 1.93 mu g cm(-2) month(-1); however, only winter period estimation is possible (December-February). During winter in Changbai, 87% of EC in snow is estimated to be due to dry deposition, with a mean dry deposition velocity of 6.44 x 10(-3) ms(-1) and median of 8.14 x 10(-3) ms(-1). Finally, the calculation of the radiative effect shows that 500 ng g(-1) of dry-deposited EC to a snow surface absorbs three times more incoming solar energy than the same mass mixed in the snow through wet deposition. Deposition processes of an EC-containing snow surface are, therefore, crucial to estimate its radiative forcing better, particularly in northeastern China, where local emission strongly influences the level and gradient of EC in the snowpack, and snow-covered areas are cold and dry due to the atmospheric general circulation. Furthermore, this study builds on the knowledge to characterize the conditions in the snow-laden Chinese rural areas better as well as to constrain transport of EC to the Arctic better.

Place, publisher, year, edition, pages
COPERNICUS GESELLSCHAFT MBH , 2014. Vol. 14, no 2, 629-640 p.
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:su:diva-101750DOI: 10.5194/acp-14-629-2014ISI: 000330853800008OAI: diva2:705857
Swedish Research Council Formas


Available from: 2014-03-18 Created: 2014-03-14 Last updated: 2015-06-01Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Ström, J.
By organisation
Department of Applied Environmental Science (ITM)
In the same journal
Atmospheric Chemistry And Physics
Meteorology and Atmospheric Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 22 hits
ReferencesLink to record
Permanent link

Direct link