Indian Ocean Variability in the CMIP5 Multimodel Ensemble: The Basin Mode

Indian Ocean Variability in the CMIP5 Multimodel Ensemble: The Basin Mode
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CMIP5 多模型系综中的印度洋变化:盆地模式

DOI:
10.1175/jcli-d-12-00678.1
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发表时间:
2013-09
期刊:
影响因子:
4.9
通讯作者:
Huang Gang
Huang Gang
中科院分区:
地球科学2区
文献类型:
--
作者:
Yang Ya-Li;Zheng Xiao-Tong;Liu Lin;Huang Gang

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本研究评估了耦合模式比对项目(CMIP5)第五阶段模型中印度洋盆地(IOB)模式和相关物理过程的模拟。 20 个 CMIP5 模型的历史运行可用于分析。他们再现了 IOB 模式及其与厄尔尼诺南方涛动 (ENSO) 的密切关系。一半的模型捕捉到了关键的 IOB 过程:热带印度洋南部 (TIO) 的下涌海洋罗斯贝波先于北方秋季的 IOB 发展,并在接下来的春季引发了横跨赤道的反对称风异常模式。异常风型导致北印度洋(NIO)在夏季出现第二次变暖,并通过辐射温暖的对流层开尔文波维持西北太平洋的反气旋风异常。 NIO 的第二次变暖表明 TIO 内部存在海洋-大气相互作用。超过一半的模型显示 NIO 变暖的双峰,正如在厄尔尼诺现象之后观察到的那样,而其余的模型仅显示一个冬季峰值。 IOB模式特征的模式间多样性似乎与TIO南部温跃层对ENSO引起的风变化的调整有关。几乎所有模型都显示 IOB 方差的数十年变化,可能受到 ENSO 的调节。
This study evaluates the simulation of the Indian Ocean Basin (IOB) mode and relevant physical processes in models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). Historical runs from 20 CMIP5 models are available for the analysis. They reproduce the IOB mode and its close relationship to El Nino-Southern Oscillation (ENSO). Half of the models capture key IOB processes: a downwelling oceanic Rossby wave in the southern tropical Indian Ocean (TIO) precedes the IOB development in boreal fall and triggers an antisymmetric wind anomaly pattern across the equator in the following spring. The anomalous wind pattern induces a second warming in the north Indian Ocean (NIO) through summer and sustains anticyclonic wind anomalies in the northwest Pacific by radiating a warm tropospheric Kelvin wave. The second warming in the NIO is indicative of ocean-atmosphere interaction in the interior TIO. More than half of the models display a double peak in NIO warming, as observed following El Nino, while the rest show only one winter peak. The intermodel diversity in the characteristics of the IOB mode seems related to the thermocline adjustment in the south TIO to ENSO-induced wind variations. Almost all the models show multidecadal variations in IOB variance, possibly modulated by ENSO.
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