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学科主题: Meteorology & Atmospheric Sciences
题名: What drives the seasonal onset and decay of the Western Hemisphere warm pool?
作者: Lee, SK ; Enfield, DB ; Wang, C
通讯作者: sang-ki.lee@noaa.gov
刊名: JOURNAL OF CLIMATE
发表日期: 2007-01-01
卷: 20, 期:10, 页:2133-2146
收录类别: sci
部门归属: Univ Miami, Cooperat Inst Marine & Atmospher Studies, Miami, FL 33149 USA; NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 USA
摘要: The annual heat budget of the Western Hemisphere warm pool (WHWP) is explored using the output of an ocean general circulation model (OGCM) simulation. According to the analysis, the WHWP cannot be considered as a monolithic whole with a single set of dominating processes that explain its behavior. The three regions considered, namely the eastern north Pacific ( ENP), the Gulf of Mexico (GoM), and the Caribbean Sea (CBN), are each unique in terms of the atmospheric and oceanic processes that dominate the corresponding heat budgets. In the ENP region, clear-sky shortwave radiation flux is responsible for the growth of the warm pool in boreal spring, while increased cloud cover in boreal summer and associated reduction in solar radiation play a crucial role for the ENP warm pool's demise. Ocean upwelling in the Costa Rica Dome connected to surrounding areas by horizontal advection offers a persistent yearlong cooling mechanism. Over the Atlantic, the clear- sky radiation flux that increases monotonically from December to May and decreases later is largely responsible for the onset and decay of the Atlantic- side warm pool in boreal summer and fall. The CBN region is affected by upwelling and horizontal advective cooling within and away from the coastal upwelling zone off northern South America during the onset and peak phases, thus slowing down the warm pool's development, but no evidence was found that advective heat flux divergence is important in the GoM region. Turbulent mixing is also an important cooling mechanism in the annual cycle of the WHWP, and the vertical shear at the warm pool base helps to sustain the turbulent mixing. Common to all three WHWP regions is the reduction of wind speed at the peak phase, suggestive of a convection-evaporation feedback known to be important in the Indo-Pacific warm pool dynamics.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8451
Appears in Collections:海洋科技动态信息-印太暖池系统研究_期刊论文

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Lee, SK; Enfield, DB; Wang, C.What drives the seasonal onset and decay of the Western Hemisphere warm pool?,JOURNAL OF CLIMATE,2007,20(10):2133-2146
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