Tropical indian ocean variability in the IPCC twentieth-century climate simulations
Tropical indian ocean variability in the IPCC twentieth-century climate simulations
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DOI：
10.1175/jcli3847.1
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发表时间：
2006-09
影响因子：
4.9
通讯作者：
N. Saji;S. Xie;T. Yamagata
中科院分区：
文献类型：
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作者：
N. Saji;S. Xie;T. Yamagata
摘要对提交给政府间气候变化专门委员会第四次评估报告(IPCC AR4)的17个海-气耦合大气环流模式(CGCM)在20世纪的模拟进行了评估，以评估它们在再现印度洋(IO)气候变化观测模式方面的技巧。在厄尔尼诺-南方涛动(ENSO)在太平洋达到高峰几个月后，大多数模型成功地捕捉到了IO延迟的、在整个盆地范围内变暖的反应。ENSO通过印度尼西亚群岛的沿岸波进入IO的海洋遥相关在这些模式中模拟得很差，辐射Rossby波的转向纬度发生了显著变化。在观测中，ENSO通过大气桥梁机制迫使强海洋Rossby波在热带IO西南部的温跃层穹顶内引起SST、大气对流和热带气旋的异常。虽然几乎所有的模式都模拟了西南IO温跃层穹顶，但这种海洋Rossby波的响应是不同的。
Abstract The twentieth-century simulations using by 17 coupled ocean–atmosphere general circulation models (CGCMs) submitted to the Intergovernmental Panel on Climate Change’s Fourth Assessment Report (IPCC AR4) are evaluated for their skill in reproducing the observed modes of Indian Ocean (IO) climate variability. Most models successfully capture the IO’s delayed, basinwide warming response a few months after El Nino–Southern Oscillation (ENSO) peaks in the Pacific. ENSO’s oceanic teleconnection into the IO, by coastal waves through the Indonesian archipelago, is poorly simulated in these models, with significant shifts in the turning latitude of radiating Rossby waves. In observations, ENSO forces, by the atmospheric bridge mechanism, strong ocean Rossby waves that induce anomalies of SST, atmospheric convection, and tropical cyclones in a thermocline dome over the southwestern tropical IO. While the southwestern IO thermocline dome is simulated in nearly all of the models, this ocean Rossby wave respo...