气候变化领域集成服务门户(CCPortal): A key factor initiating surface ablation of Arctic sea ice: Earlier and increasing liquid precipitation

CCPortal

DOI	10.5194/tc-13-1233-2019
	A key factor initiating surface ablation of Arctic sea ice: Earlier and increasing liquid precipitation
	Dou T.; Xiao C.; Liu J.; Han W.; Du Z.; Mahoney A.R.; Jones J.; Eicken H.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1233
结束页码	1246
卷号	13 期号:4
英文摘要	Snow plays an important role in the Arctic climate system, modulating heat transfer in terrestrial and marine environments and controlling feedbacks. Changes in snow depth over Arctic sea ice, particularly in spring, have a strong impact on the surface energy budget, influencing ocean heat loss, ice growth and surface ponding. Snow conditions are sensitive to the phase (solid or liquid) of deposited precipitation. However, variability and potential trends of rain-on-snow events over Arctic sea ice and their role in sea-ice losses are poorly understood. Time series of surface observations at UtqiaÄ¡vik, Alaska, reveal rapid reduction in snow depth linked to late-spring rain-on-snow events. Liquid precipitation is key in preconditioning and triggering snow ablation through reduction in surface albedo as well as latent heat release determined by rainfall amount, supported by field observations beginning in 2000 and model results. Rainfall was found to accelerate warming and ripening of the snowpack, with even small amounts (such as 0.3mm recorded on 24 May 2017) triggering the transition from the warming phase into the ripening phase. Subsequently, direct heat input drives snowmelt, with water content of the snowpack increasing until meltwater output occurs, with an associated rapid decrease in snow depth. Rainfall during the ripening phase can further raise water content in the snow layer, prompting onset of the meltwater output phase in the snowpack. First spring rainfall in UtqiaÄ¡vik has been observed to shift to earlier dates since the 1970s, in particular after the mid-1990s. Early melt season rainfall and its fraction of total annual precipitation also exhibit an increasing trend. These changes of precipitation over sea ice may have profound impacts on ice melt through feedbacks involving earlier onset of surface melt. © 2019 Author(s).
学科领域	ablation; albedo; liquid; precipitation (climatology); rainfall; sea ice; snow; snowmelt; snowpack; trend analysis; warming; Arctic
语种	英语
scopus关键词	ablation; albedo; liquid; precipitation (climatology); rainfall; sea ice; snow; snowmelt; snowpack; trend analysis; warming; Arctic
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118894
作者单位	College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, 100875, China; Institute of Polar Meteorology, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; Beijing Meteorological Observation Center, Beijing, 102600, China; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775-7320, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775-7340, United States
推荐引用方式 GB/T 7714	Dou T.,Xiao C.,Liu J.,et al. A key factor initiating surface ablation of Arctic sea ice: Earlier and increasing liquid precipitation[J],2019,13(4).
APA	Dou T..,Xiao C..,Liu J..,Han W..,Du Z..,...&Eicken H..(2019).A key factor initiating surface ablation of Arctic sea ice: Earlier and increasing liquid precipitation.The Cryosphere,13(4).
MLA	Dou T.,et al."A key factor initiating surface ablation of Arctic sea ice: Earlier and increasing liquid precipitation".The Cryosphere 13.4(2019).