气候变化领域集成服务门户(CCPortal): Linking global changes of snowfall and wet-bulb temperature

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DOI	10.1175/JCLI-D-19-0254.1
	Linking global changes of snowfall and wet-bulb temperature
	Tamang S.K.; Ebtehaj A.M.; Prein A.F.; Heymsfield A.J.
发表日期	2020
ISSN	0894-8755
起始页码	39
结束页码	59
卷号	33 期号:1
英文摘要	Snowfall is one of the primary drivers of the global cryosphere and is declining in many regions of the world with widespread hydrological and ecological consequences. Previous studies have shown that the probability of snowfall occurrence is well described by wet-bulb temperatures below 1°C (1.1°C) over land (ocean). Using this relationship, wet-bulb temperatures from three reanalysis products as well as multisatellite and reanalysis precipitation data are analyzed from 1979 to 2017 to study changes in potential snowfall areas, snowfall-torainfall transition latitude, snowfall amount, and snowfall-to-precipitation ratio (SPR). Results are presented at hemispheric scales, as well as for three Köppen-Geiger climate classes and four major mountainous regions including the Alps, the western United States, High Mountain Asia (HMA), and the Andes. In all reanalysis products, while changes in the wet-bulb temperature over the Southern Hemisphere are mostly insignificant, significant positive trends are observed over the Northern Hemisphere (NH). Significant reductions are observed in annual-mean potential snowfall areas over NH land (ocean) by 0.52 (0.34) million km2 decade-1 due to an increase of 0.34°C (0.35°C) decade-1 in wet-bulb temperature. The fastest retreat in NH transition latitudes is observed over Europe and central Asia at 0.78 and 0.458 decade-1. Among mountainous regions, the largest decline in potential snowfall areas is observed over the Alps at 3.64% decade-1 followed by the western United States at 2.81% and HMA at 1.85% decade-1. This maximum decrease over the Alps is associated with significant reductions in annual snowfall of 20 mm decade-1 and SPR of 2% decade-1 © 2019 American Meteorological Society.
英文关键词	Ecology; Ecological consequences; Mountainous regions; Northern hemisphere; Precipitation data; Precipitation ratios; Southern Hemisphere; Western United States; Wet bulb temperature; Snow; annual variation; cryosphere; precipitation assessment; precipitation intensity; satellite data; snow; Central Asia; Europe
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171541
作者单位	Saint Anthony Falls Laboratory, Department of Civil, Environmental and Geo-Engineering, University of Minnesota-Twin Cities, Minneapolis, MN, United States; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Tamang S.K.,Ebtehaj A.M.,Prein A.F.,et al. Linking global changes of snowfall and wet-bulb temperature[J],2020,33(1).
APA	Tamang S.K.,Ebtehaj A.M.,Prein A.F.,&Heymsfield A.J..(2020).Linking global changes of snowfall and wet-bulb temperature.Journal of Climate,33(1).
MLA	Tamang S.K.,et al."Linking global changes of snowfall and wet-bulb temperature".Journal of Climate 33.1(2020).