Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0213.1 |
The Gulf Stream Convergence Zone in the Time-Mean Winds | |
O&1; 39;Neill, Larry W.2 | |
2017-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The distribution of surface divergence in the northwest Atlantic is investigated using 10 years of satellite wind observations from QuikSCAT and a 1-yr simulation from the COAMPS atmospheric model. A band of time-mean surface convergence overlies the Gulf Stream [called here theGulf Stream convergence zone (GSCZ)] and has been attributed previously to a local boundary layer response to Gulf Stream SST gradients. However, this analysis shows that the GSCZ results mainly from the aggregate impacts of strong convergence anomalies associated with storms propagating along the storm track, which approximately overlies theGulf Stream. Storm surface convergence anomalies are one to two orders of magnitude greater than the time-mean convergence and produce a highly asymmetric divergence distribution skewed toward convergent winds. The sensitivity of the sign and magnitude of the time-mean divergence to extreme weather events is demonstrated through analysis using an extreme-value filter, conditional sampling based on rain occurrence, and comparison to its median and mode. Vertical velocity and surface pressure are likewise affected by strong storms, which are characterized by upward velocity and low surface pressure. Storms are thus an important process in shaping the mean state of the atmosphere in the northwest Atlantic. These results are difficult to reconcile with the prevailing view that SST "anchors'' surface convergence, upward vertical velocity, and increased rain over theGulf Stream through a local boundary layer adjustment mechanism. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405556700016 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; NORTHERN-HEMISPHERE WINTER ; LOW-FREQUENCY VARIABILITY ; BOUNDARY-LAYER STRUCTURE ; STORM-TRACK VARIABILITY ; OCEANIC THERMAL FRONT ; ATMOSPHERIC RESPONSE ; DENSITY-FUNCTION ; EASTERN PACIFIC ; SST FRONT |
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/29626 |
专题 | 地球科学 |
作者单位 | 1.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 2.Naval Res Lab, Marine Meteorol Div, Monterey, CA USA |
推荐引用方式 GB/T 7714 | O&,39;Neill, Larry W.. The Gulf Stream Convergence Zone in the Time-Mean Winds[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(7). |
APA | O&,&39;Neill, Larry W..(2017).The Gulf Stream Convergence Zone in the Time-Mean Winds.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(7). |
MLA | O&,et al."The Gulf Stream Convergence Zone in the Time-Mean Winds".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.7(2017). |
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