气候变化领域集成服务门户(CCPortal): Intercomparison of precipitation estimates over the southern ocean from atmospheric reanalyses

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DOI	10.1175/JCLI-D-20-0044.1
	Intercomparison of precipitation estimates over the southern ocean from atmospheric reanalyses
	Boisvert L.N.; Webster M.A.; Petty A.A.; Markus T.; Cullather R.I.; Bromwich D.H.
发表日期	2020
ISSN	0894-8755
起始页码	10627
结束页码	10651
卷号	33 期号:24
英文摘要	Precipitation is a major component of the hydrologic cycle and plays a significant role in the sea ice mass balance in the polar regions. Over the Southern Ocean, precipitation is particularly uncertain due to the lack of direct observations in this remote and harsh environment. Here we demonstrate that precipitation estimates from eight global reanalyses produce similar spatial patterns between 2000 and 2010, although their annual means vary by about 250mmyr-1 (or 26% of the median values) and there is little similarity in their representation of interannual variability. ERA-Interim produces the smallest and CFSR produces the largest amount of precipitation overall. Rainfall and snowfall are partitioned in five reanalyses; snowfall suffers from the same issues as the total precipitation comparison, with ERA-Interim producing about 128mm less snowfall and JRA-55 about 103mm more rainfall compared to the other reanalyses.When compared to CloudSat-derived snowfall, these five reanalyses indicate similar spatial patterns, but differ in their magnitude. All reanalyses indicate precipitation on nearly every day of the year, with spurious values occurring on an average of about 60 days yr-1, resulting in an accumulation of about 4.5mmyr-1.While similarities in spatial patterns among the reanalyses suggest a convergence, the large spread in magnitudes points to issues with the background models in adequately reproducing precipitation rates, and the differences in the model physics employed. Further improvements to model physics are required to achieve confidence in precipitation rate, as well as the phase and frequency of precipitation in these products. © 2020 American Meteorological Society.
英文关键词	Rain; Sea ice; Background model; Direct observations; Harsh environment; Hydrologic cycles; Interannual variability; Precipitation rates; Spatial patterns; Total precipitation; Snow; annual variation; comparative study; precipitation assessment; rainfall; snow; Southern Ocean
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/171037
作者单位	NASA Goddard Space Flight Center, Greenbelt, MD, United States; University of Alaska Fairbanks, Fairbanks, AK, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States; Byrd Polar and Climate Research Center, The Ohio State University, Columbus, OH, United States
推荐引用方式 GB/T 7714	Boisvert L.N.,Webster M.A.,Petty A.A.,et al. Intercomparison of precipitation estimates over the southern ocean from atmospheric reanalyses[J],2020,33(24).
APA	Boisvert L.N.,Webster M.A.,Petty A.A.,Markus T.,Cullather R.I.,&Bromwich D.H..(2020).Intercomparison of precipitation estimates over the southern ocean from atmospheric reanalyses.Journal of Climate,33(24).
MLA	Boisvert L.N.,et al."Intercomparison of precipitation estimates over the southern ocean from atmospheric reanalyses".Journal of Climate 33.24(2020).