气候变化领域集成服务门户(CCPortal): Blowing snow sublimation and transport over Antarctica from 11 years of CALIPSO observations

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DOI	10.5194/tc-11-2555-2017
	Blowing snow sublimation and transport over Antarctica from 11 years of CALIPSO observations
	Palm S.P.; Kayetha V.; Yang Y.; Pauly R.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Blowing snow processes commonly occur over the earth's ice sheets when the 10 m wind speed exceeds a threshold value. These processes play a key role in the sublimation and redistribution of snow thereby influencing the surface mass balance. Prior field studies and modeling results have shown the importance of blowing snow sublimation and transport on the surface mass budget and hydrological cycle of high-latitude regions. For the first time, we present continent-wide estimates of blowing snow sublimation and transport over Antarctica for the period 2006-2016 based on direct observation of blowing snow events. We use an improved version of the blowing snow detection algorithm developed for previous work that uses atmospheric backscatter measurements obtained from the CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) lidar aboard the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) satellite. The blowing snow events identified by CALIPSO and meteorological fields from MERRA-2 are used to compute the blowing snow sublimation and transport rates. Our results show that maximum sublimation occurs along and slightly inland of the coastline. This is contrary to the observed maximum blowing snow frequency which occurs over the interior. The associated temperature and moisture reanalysis fields likely contribute to the spatial distribution of the maximum sublimation values. However, the spatial pattern of the sublimation rate over Antarctica is consistent with modeling studies and precipitation estimates. Overall, our results show that the 2006-2016 Antarctica average integrated blowing snow sublimation is about 393 ± 196 Gt yr-1, which is considerably larger than previous model-derived estimates. We find maximum blowing snow transport amount of 5 Mt km-1 yr-1 over parts of East Antarctica and estimate that the average snow transport from continent to ocean is about 3.7 Gt yr-1. These continent-wide estimates are the first of their kind and can be used to help model and constrain the surface mass budget over Antarctica. © 2017 Author(s).
学科领域	algorithm; backscatter; blowing snow; CALIOP; CALIPSO; glacier mass balance; hydrological cycle; ice sheet; observational method; snow cover; spatial distribution; sublimation; transport process; Antarctica
语种	英语
scopus关键词	algorithm; backscatter; blowing snow; CALIOP; CALIPSO; glacier mass balance; hydrological cycle; ice sheet; observational method; snow cover; spatial distribution; sublimation; transport process; Antarctica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119311
作者单位	Science Systems Applications Inc., 10210 Greenbelt Road, Greenbelt, MD 20771, United States; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States
推荐引用方式 GB/T 7714	Palm S.P.,Kayetha V.,Yang Y.,et al. Blowing snow sublimation and transport over Antarctica from 11 years of CALIPSO observations[J],2017,11(6).
APA	Palm S.P.,Kayetha V.,Yang Y.,&Pauly R..(2017).Blowing snow sublimation and transport over Antarctica from 11 years of CALIPSO observations.Cryosphere,11(6).
MLA	Palm S.P.,et al."Blowing snow sublimation and transport over Antarctica from 11 years of CALIPSO observations".Cryosphere 11.6(2017).