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DOI | 10.1002/joc.5051 |
Convection regimes and tropical-midlatitude interactions over the Intra-American Seas from May to November | |
Vigaud, N.; Robertson, A. W. | |
2017-08-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A cluster analysis is applied to National Oceanic and Atmospheric Administration daily outgoing longwave radiation anomaly fields over the Intra-American Seas, for the May to November rainy season 1980-2009. Seven recurrent convection regimes are identified, each with distinct impacts on local rainfall. Three suppressed-convection regimes prevailing throughout the season and in particular during the Mid-Summer Drought are related to transient anticyclonic circulation anomalies and broad drying over the region. The remaining regimes are all related to enhanced convection and cyclonic circulation anomalies over the Caribbean. For one wet regime, the cyclonic anomaly is located over Central America, which increases moisture advection from the eastern Pacific and in turn rainfall over Central and South America to the disadvantage of northern regions of the Caribbean. The three other regimes are associated with a weaker Caribbean Low Level Jet along its southern branch stretching along the South American coast, while its northern branch is strengthened, exposing the Caribbean to more moisture advection from the northeast trade winds, enhancing convection and rainfall locally. These three wet regimes are related to northwestward-propagating convective cells that can be traced in a composite sense to the southward incursion of baroclinic waves from the midlatitudes, and anticyclonic wave breaking. In addition, their frequencies are found to be higher during phases 1 and 2 of the Madden-Julian Oscillation, suggesting a connection with easterly waves emanating from African convection. Relationships are shown between these three northwestward-propagating wet regimes and historical floods in the Caribbean illustrating the potential value of the convective regime approach for ultimately improving regional predictions and disaster early warning on sub-seasonal scales. |
英文关键词 | sub-seasonal convection variability weather typing tropical-midlatitudes interactions IAS rainfall Caribbean floods |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417298600066 |
WOS关键词 | LOW-LEVEL JET ; NINO-SOUTHERN-OSCILLATION ; AFRICAN EASTERLY WAVES ; ATLANTIC WARM POOL ; PART I ; CARIBBEAN RAINFALL ; NORTH-ATLANTIC ; INTERANNUAL VARIABILITY ; PRECIPITATION PATTERNS ; SURFACE TEMPERATURE |
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/37712 |
专题 | 气候变化 |
作者单位 | Columbia Univ, Earth Inst, IRI, Int Res Inst Climate, New York, NY USA |
推荐引用方式 GB/T 7714 | Vigaud, N.,Robertson, A. W.. Convection regimes and tropical-midlatitude interactions over the Intra-American Seas from May to November[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37. |
APA | Vigaud, N.,&Robertson, A. W..(2017).Convection regimes and tropical-midlatitude interactions over the Intra-American Seas from May to November.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37. |
MLA | Vigaud, N.,et al."Convection regimes and tropical-midlatitude interactions over the Intra-American Seas from May to November".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37(2017). |
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