DOI: 10.1175/JCLI-D-16-0120.1
Scopus记录号: 2-s2.0-85014002424
论文题名: Local atmospheric response to an open-ocean polynya in a high-resolution climate model
作者: Weijer W. ; Veneziani M. ; Stössel A. ; Hecht M.W. ; Jeffery N. ; Jonko A. ; Hodos T. ; Wang H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 5 起始页码: 1629
结束页码: 1641
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate models
; Oceanography
; Precipitation (meteorology)
; Atmospheric response
; Coarser resolution
; Earth system model
; High resolution climate model
; Interannual time scale
; Long-wave radiation
; Radiative fluxes
; Turbulent heat fluxes
; Sea ice
; albedo
; brightness temperature
; climate modeling
; cloud
; computer simulation
; sea ice
; Southern Ocean
英文摘要: In this paper the atmospheric response to an open-ocean polynya in the Southern Ocean is studied by analyzing the results from an atmospheric and oceanic synoptic-scale resolving Community Earth System Model (CESM) simulation.While coarser-resolution versions of CESMgenerally do not produce open-ocean polynyas in the SouthernOcean, they do emerge and disappear on interannual time scales in the synoptic-scale simulation.This provides an ideal opportunity to study the polynya's impact on the overlying and surrounding atmosphere.This has been pursued here by investigating the seasonal cycle of differences of surface and air-column variables between polynya and nonpolynya years. The results indicate significant local impacts on turbulent heat fluxes, precipitation, cloud characteristics, and radiative fluxes. In particular, it is found that clouds over polynyas are optically thicker and higher than clouds over sea ice during nonpolynya years. Although the lower albedo of polynyas significantly increases the net shortwave absorption, the enhanced cloud brightness tempers this increase by almost 50%. Also, in this model, enhanced longwave radiation emitted from the warmer surface of polynyas is balanced by stronger downwelling fluxes from the thicker cloud deck. Impacts are found to be sensitive to the synopticwind direction. The strongest regional impacts are foundwhen northeasterlywinds cross the polynya and interact with katabatic winds. Surface air pressure anomalies over the polynya are only found to be significant when cold, dry air masses strike over the polynya (i.e., in the case of southerly winds). © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49822
Appears in Collections: 气候变化事实与影响
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作者单位: Los Alamos National Laboratory, Los Alamos, NM, United States; Texas A and M University, College Station, TX, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; U.S. Air Force Academy, Colorado SpringsCO, United States; Pacific Northwest National Laboratory, Richland, WA, United States
Recommended Citation:
Weijer W.,Veneziani M.,Stössel A.,et al. Local atmospheric response to an open-ocean polynya in a high-resolution climate model[J]. Journal of Climate,2017-01-01,30(5)