DOI: 10.1175/JCLI-D-15-0559.1
Scopus记录号: 2-s2.0-84977493049
论文题名: Atmospheric moisture transport to the arctic: Assessment of reanalyses and analysis of transport components
作者: Dufour A. ; Zolina O. ; Gulev S.K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 14 起始页码: 5061
结束页码: 5081
语种: 英语
Scopus关键词: Atmospheric humidity
; Budget control
; Evaporation
; Moisture
; Radiosondes
; Storms
; Arctic
; Geographic location
; Hydrologic cycles
; Radiosonde observations
; Reanalysis
; Transport
; Atmospheric movements
; algorithm
; atmospheric moisture
; hydrological cycle
; moisture transfer
; radiosonde
; storm track
; tropical cyclone
; Arctic
英文摘要: The atmospheric water cycle of the Arctic is evaluated via seven global reanalyses and in radiosonde observations covering the 1979-2013 period. In the regional moisture budget, evaporation and precipitation are the least consistent terms among different datasets. Despite the assimilation of radiosoundings, the reanalyses present a tendency to overestimate the moisture transport. Aside from this overestimation, the reanalyses exhibit a remarkable agreement with the radiosondes in terms of spatial and temporal patterns. The northern North Atlantic, subpolar North Pacific, and Labrador Sea stand out as the main gateways for moisture to the Arctic in all reanalyses. Because these regions correspond to the end of the storm tracks, the link between moisture transports and extratropical cyclones is further investigated by decomposing the moisture fluxes in the mean flow and transient eddy parts. In all reanalyses, the former term tends to cancel out when averaged over a latitude circle, leaving the latter to provide the bulk of the midlatitude moisture imports (89%-94% at 70°N). Although the Arctic warms faster than the rest of the world, the impact of these changes on its water cycle remains ambiguous. In most datasets, evaporation, precipitation, and precipitable water increase in line with what is expected from a warming signal. At the same time, the moisture transports have decreased in all the reanalyses but not in the radiosonde observations, though none of these trends is statistically significant. The fluxes do not scale with the Clausius-Clapeyron relation because the increasing humidity is not correlated with the meridional wind, particularly near the surface. © 2016 American Meteorological Society. 资助项目: ANR, Agence Nationale de la Recherche
; CNRS, Centre National de la Recherche Scientifique
; Ministry of Education and Science
; NASA, National Aeronautics and Space Administration
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50301
Appears in Collections: 气候变化事实与影响
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作者单位: LGGE, CNRS/UJF, Grenoble, France; P. P. Shirshov Institute of Oceanology, Moscow, Russian Federation
Recommended Citation:
Dufour A.,Zolina O.,Gulev S.K.. Atmospheric moisture transport to the arctic: Assessment of reanalyses and analysis of transport components[J]. Journal of Climate,2016-01-01,29(14)