Indian Ocean Variability and Its Association with ENSO in a Global Coupled Model
Indian Ocean Variability and Its Association with ENSO in a Global Coupled Model
复制标题
DOI：
10.1175/jcli3493.1
复制
发表时间：
2005-09
影响因子：
4.9
通讯作者：
A. Zhong;H. Hendon;O. Alves
中科院分区：
文献类型：
--
作者：
A. Zhong;H. Hendon;O. Alves
利用澳大利亚气象局的100年耦合季节预报模式，研究了厄尔尼诺-南方涛动期间印度洋的演变。在厄尔尼诺现象期间，东赤道印度洋引起偏东异常。这些作用抑制了西部赤道温跃层并将其抬升到东部，并在东部（西部）最初冷却（温暖）海表温度（SST）。随后，整个印度洋盆地变暖，主要是由于潜热通量减少和与降雨抑制相关的短波辐射增强。这种演变可以部分解释为激发了一种内在耦合模式，该模式涉及异常赤道东风和海温和降雨的纬向梯度之间的反馈。这种正反馈在北半球夏季和秋季发展，当时赤道东印度洋的平均温跃层较浅，这是对东南贸易风的反应。这及…
Abstract The evolution of the Indian Ocean during El Nino–Southern Oscillation is investigated in a 100-yr integration of an Australian Bureau of Meteorology coupled seasonal forecast model. During El Nino, easterly anomalies are induced across the eastern equatorial Indian Ocean. These act to suppress the equatorial thermocline to the west and elevate it to the east and initially cool (warm) the sea surface temperature (SST) in the east (west). Subsequently, the entire Indian Ocean basin warms, mainly in response to the reduced latent heat flux and enhanced shortwave radiation that is associated with suppressed rainfall. This evolution can be partially explained by the excitation of an intrinsic coupled mode that involves a feedback between anomalous equatorial easterlies and zonal gradients in SST and rainfall. This positive feedback develops in the boreal summer and autumn seasons when the mean thermocline is shallow in the eastern equatorial Indian Ocean in response to trade southeasterlies. This posi...