Global Warming Attenuates the Tropical Atlantic-Pacific Teleconnection.
Global Warming Attenuates the Tropical Atlantic-Pacific Teleconnection.
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全球变暖削弱了热带大西洋-太平洋遥相关
DOI：
10.1038/srep20078
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发表时间：
2016-02-03
影响因子：
4.6
通讯作者：
Cai W
中科院分区：
文献类型：
--
作者：
Jia F;Wu L;Gan B;Cai W
自上个世纪末以来，全球海表温度（SST）的变化显示出一种广泛的变暖模式，但赤道东太平洋和美洲大陆西海岸的冷却被拦截。研究表明，赤道东太平洋的冷却可能部分是由北大西洋的变暖引起的。然而，在全球变暖的情况下，这种热带遥相关的稳定性如何仍然是未知的。结果表明，随着CO2浓度的增加，从热带大西洋到太平洋的热带遥相关显著减弱。这种影响的减少与热带太平洋平均状态的厄尔尼诺式变暖有关，这导致太平洋热带辐合带的季节性迁移有限，海洋热量输送减弱。热带大西洋海温距平在较暖气候条件下的快速衰减也是遥相关减弱的原因。我们的研究表明，随着温室效应的持续，热带太平洋的趋势以及ENSO的发展将不那么频繁地被大西洋打断，因为这种衰减。减弱的遥相关也得到了CMIP5模式的支持，尽管只有少数模式可以捕捉到这种热带间的遥相关。
Changes in global sea surface temperature (SST) since the end of last century display a pattern of widespread warming intercepted by cooling in the eastern equatorial Pacific and western coasts of the American continent. Studies have suggested that the cooling in the eastern equatorial Pacific may be partly induced by warming in the North Atlantic. However, it remains unknown how stable this inter-tropical teleconnection will be under global warming. Here we show that the inter-tropical teleconnection from the tropical Atlantic to Pacific weakens substantially as the CO2concentration increases. This reduced impact is related to the El Niño-like warming of the tropical Pacific mean state, which leads to limited seasonal migration of the Pacific inter-tropical convergence zone (ITCZ) and weakened ocean heat transport. A fast decay of the tropical Atlantic SST anomalies in a warmer climate also contributes to the weakened teleconnection. Our study suggests that as greenhouse warming continues, the trend in the tropical Pacific as well as the development of ENSO will be less frequently interrupted by the Atlantic because of this attenuation. The weakened teleconnection is also supported by CMIP5 models, although only a few of these models can capture this inter-tropical teleconnection.