DOI: 10.1029/2018JD028557
Scopus记录号: 2-s2.0-85052433130
论文题名: Impacts of Snow Darkening by Deposition of Light-Absorbing Aerosols on Hydroclimate of Eurasia During Boreal Spring and Summer
作者: Lau W.K.M. ; Sang J. ; Kim M.K. ; Kim K.M. ; Koster R.D. ; Yasunari T.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 16 起始页码: 8441
结束页码: 8461
语种: 英语
英文关键词: absorbing aerosols
; black carbon
; dust
; Eurasia
; heat waves
; hydroclimate
; snow-darkening effects
英文摘要: 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113226
Appears in Collections: 气候减缓与适应
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作者单位: Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Atmospheric Science, Kongju National University, Gongju, South Korea; Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Faculty of Engineering, Hokkaido University, Sapporo, Japan; Arctic Research Center, Hokkaido University, Sapporo, Japan
Recommended Citation:
Lau W.K.M.,Sang J.,Kim M.K.,et al. Impacts of Snow Darkening by Deposition of Light-Absorbing Aerosols on Hydroclimate of Eurasia During Boreal Spring and Summer[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(16)