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Impacts of Snow Darkening by Deposition of Light‐Absorbing Aerosols on Hydroclimate of Eurasia During Boreal Spring and Summer
Author(s) -
Lau William K. M.,
Sang Jeong,
Kim M. K.,
Kim K. M.,
Koster R. D.,
Yasunari T. J.
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2018jd028557
Subject(s) - snowmelt , environmental science , snow , climatology , atmospheric sciences , boreal , albedo (alchemy) , geopotential height , relative humidity , precipitation , geology , geography , meteorology , art , paleontology , performance art , art history
Abstract In this study, we used the NASA GEOS‐5 climate model to investigate the impact of snow darkening by deposition of light‐absorbing aerosols on the hydroclimate of Eurasia during boreal spring and summer. Two sets of 10‐member ensemble model integrations with prescribed sea surface temperature were carried out for 10 simulated years (2002–2011); one includes snow‐darkening effects (SDE) by light‐absorbing aerosols and one does not (NSDE). Differences between the two experiments in the hydroclimates over Eurasia were evaluated. Results show that SDE warming is most pronounced during the melting season due to strong snow‐albedo feedback in the vicinity of the retreating seasonal snowline. SDE spurs a wet‐first‐dry‐later modulation of the surface energy and water balances, characterized by an accelerated (days‐to‐weeks) snowmelt, accompanied by excessive runoff and a warming and wetting of the land (relative to NSDE) during the early melting season. The snowmelt is followed by a fast desiccation of the land during the late melting, and early warming season, and then a prolonged warmer and drier land, through the boreal summer. The prolonged warming is sustained by atmospheric conditions favorable for the development of atmospheric blocking, that is, higher middle‐to‐upper‐tropospheric geopotential height, lower relative humidity, reduced cloudiness, and enhanced atmospheric subsidence. Overall, SDE by light‐absorbing aerosols leads to a warmer and drier boreal summer hydroclimate, increasing the frequency of the top 5 and 1% extreme hot days (as defined by NSDE statistics) over western and northern Eurasia by approximately threefold and tenfold, respectively.