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DOI | 10.1175/JCLI-D-16-0120.1 |
Local Atmospheric Response to an Open-Ocean Polynya in a High-Resolution Climate Model | |
Weijer, Wilbert1; Veneziani, Milena1; Stoessel, Achim2; Hecht, Matthew W.1; Jeffery, Nicole1; Jonko, Alexandra1; Hodos, Travis3; Wang, Hailong4 | |
2017-03-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | Mexico; USA |
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 CESM generally do not produce open-ocean polynyas in the Southern Ocean, 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 synoptic wind direction. The strongest regional impacts are found when northeasterly winds 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). |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395539100005 |
WOS关键词 | SEA-ICE ZONE ; EARTH SYSTEM MODEL ; SOUTHERN-OCEAN ; WEDDELL POLYNYA ; COSMONAUT SEA ; DEEP CONVECTION ; SIMULATIONS ; ANTARCTICA ; CLOUDS ; PHASE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20749 |
专题 | 气候变化 |
作者单位 | 1.Los Alamos Natl Lab, Los Alamos, Mexico; 2.Texas A&M Univ, College Stn, TX 77843 USA; 3.US Air Force Acad, Colorado Springs, CO USA; 4.Pacific NorthWest Natl Lab, Richland, WA USA |
推荐引用方式 GB/T 7714 | Weijer, Wilbert,Veneziani, Milena,Stoessel, Achim,et al. Local Atmospheric Response to an Open-Ocean Polynya in a High-Resolution Climate Model[J]. JOURNAL OF CLIMATE,2017,30(5). |
APA | Weijer, Wilbert.,Veneziani, Milena.,Stoessel, Achim.,Hecht, Matthew W..,Jeffery, Nicole.,...&Wang, Hailong.(2017).Local Atmospheric Response to an Open-Ocean Polynya in a High-Resolution Climate Model.JOURNAL OF CLIMATE,30(5). |
MLA | Weijer, Wilbert,et al."Local Atmospheric Response to an Open-Ocean Polynya in a High-Resolution Climate Model".JOURNAL OF CLIMATE 30.5(2017). |
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