DOI: 10.1175/JCLI-D-18-0125.1
Scopus记录号: 2-s2.0-85054074965
论文题名: Intercomparison of precipitation estimates over the Arctic ocean and its peripheral seas from reanalyses
作者: Boisvert L.N. ; Webster M.A. ; Petty A.A. ; Markus T. ; Bromwich D.H. ; Cullather R.I.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8441
结束页码: 8462
语种: 英语
英文关键词: Atmosphere
; Freezing precipitation
; Precipitation
; Reanalysis data
Scopus关键词: Budget control
; Earth atmosphere
; Oceanography
; Precipitation (chemical)
; Remote sensing
; Sea ice
; Snow
; Cloud microphysical process
; Freezing precipitations
; Interannual variability
; Precipitation controls
; Precipitation distribution
; Precipitation events
; Quantitative estimates
; Reanalysis
; Uncertainty analysis
英文摘要: Precipitation over the Arctic Ocean has a significant impact on the basin-scale freshwater and energy budgets but is one of the most poorly constrained variables in atmospheric reanalyses. Precipitation controls the snow cover on sea ice, which impedes the exchange of energy between the ocean and atmosphere, inhibiting sea ice growth. Thus, accurate precipitation amounts are needed to inform sea ice modeling, especially for the production of thickness estimates from satellite altimetry freeboard data. However, obtaining a quantitative estimate of the precipitation distribution in the Arctic is notoriously difficult because of a number of factors, including a lack of reliable, long-term in situ observations; difficulties in remote sensing over sea ice; and model biases in temperature and moisture fields and associated uncertainty of modeled cloud microphysical processes in the polar regions. Here, we compare precipitation estimates over the Arctic Ocean from eight widely used atmospheric reanalyses over the period 2000-16 (nominally the "new Arctic"). We find that the magnitude, frequency, and phase of precipitation vary drastically, although interannual variability is similar. Reanalysis-derived precipitation does not increase with time as expected; however, an increasing trend of higher fractions of liquid precipitation (rainfall) is found. When compared with drifting ice mass balance buoys, three reanalyses (ERA-Interim, MERRA, and NCEP R2) produce realistic magnitudes and temporal agreement with observed precipitation events, while two products [MERRA, version 2 (MERRA-2), and CFSR] show large, implausible magnitudes in precipitation events. All the reanalyses tend to produce overly frequent Arctic precipitation. Future work needs to be undertaken to determine the specific factors in reanalyses that contribute to these discrepancies in the new Arctic. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110674
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, 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; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Boisvert L.N.,Webster M.A.,Petty A.A.,et al. Intercomparison of precipitation estimates over the Arctic ocean and its peripheral seas from reanalyses[J]. Journal of Climate,2018-01-01,31(20)