Title Measured black carbon deposition on the Sierra Nevada snow pack and implication for snow pack retreat
Author Hadley, O.L.; Corrigan, C.E.; Kirchstetter, T.W.; Cliff, S.S.; Ramanathan, V.
Author Affil Hadley, O.L., Lawrence Berkeley National Laboratory, Environmental Energy Technologies Division, Berkeley, CA. Other: Scripps Institution of Oceanography; University of California Davis
Source Atmospheric Chemistry and Physics, 10(15), p.7505-7513, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 21 April 2010, http://www.atmos-chem-phys- discuss.net/10/10463/2010/acpd-10-10463-2010. html; accessed in June, 2011. 54 refs. GeoRef Acc. No: 310027
Index Terms aerosols; albedo; precipitation (meteorology); boundary layer; ice; metals; pollution; snow; water; water pollution; water supply; China; United States-- California--Humboldt County; United States-- California--Lassen Peak; United States-- California--Nevada County; United States-- California--Sierra Nevada; United States-- California--Trinidad Head; alkaline earth metals; Asia; atmospheric precipitation; black carbon; calcium; California; climate effects; climate forcing; deposition; discharge; Far East; Humboldt County California; iron; Lassen Peak; mountains; Nevada County California; nonpoint sources; northeastern China; Shasta County California; Sierra Nevada; snowpack; solar forcing; trajectories; Trinidad Head California; United States
Abstract Modeling studies show that the darkening of snow and ice by black carbon deposition is a major factor for the rapid disappearance of arctic sea ice, mountain glaciers and snow packs. This study provides one of the first direct measurements for the efficient removal of black carbon from the atmosphere by snow and its subsequent deposition to the snow packs of California. The early melting of the snow packs in the Sierras is one of the contributing factors to the severe water problems in California. BC concentrations in falling snow were measured at two mountain locations and in rain at a coastal site. All three stations reveal large BC concentrations in precipitation, ranging from 1.7 ng/g to 12.9 ng/g. The BC concentrations in the air after the snow fall were negligible suggesting an extremely efficient removal of BC by snow. The data suggest that below cloud scavenging, rather than ice nuclei, was the dominant source of BC in the snow. A five-year comparison of BC, dust, and total fine aerosol mass concentrations at multiple sites reveals that the measurements made at the sampling sites were representative of large scale deposition in the Sierra Nevada. The relative concentration of iron and calcium in the mountain aerosol indicates that one-quarter to one-third of the BC may have been transported from Asia.
URL http://www.atmos-chem-phys.net/10/7505/2010/acp-10-7505-2010.pdf
Publication Type journal article
Record ID 65006825