Contrasting Impacts of South and North Tropical Indian Ocean Sea Surface Temperature Anomalies on East Asian Summer Climate

Contrasting Impacts of South and North Tropical Indian Ocean Sea Surface Temperature Anomalies on East Asian Summer Climate
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南、北热带印度洋海表温度异常对东亚夏季气候的影响对比

DOI:
10.3878/aosl20150026
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发表时间:
2015-01
影响因子:
2.3
通讯作者:
Kaiming Hu
Kaiming Hu
中科院分区:
地球科学4区
文献类型:
--
作者:
Kaiming Hu

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摘要利用观测资料和模式模拟,作者发现北印度洋海温异常可触发一个向东传播的大气Kelvin波,并将其传播到赤道西太平洋,在副热带西北太平洋上空诱发一个异常反气旋,从而导致东亚-西北太平洋地区夏季气候异常。然而,对流层温度和大气Kelvin波对南印度洋(SIO)SST异常的响应较弱,因此,SIO SST异常对EANWP夏季气候的影响较弱。NIO和SIO海温异常对东亚太平洋夏季气候的影响差异很大,这可能是由于这两个地区海温的平均状态不同所致。在夏季,NIO的气候SST高于SIO,导致大气对流对NIO SST异常的响应强于SIO SST异常。因此,与SIO SST异常相比,NIO SST异常可以导致更强的对流层气温异常和大气Kelvin波,从而影响EANWP夏季气候。
Abstract Using observational data and model simulations, the author find that the North Indian Ocean (NIO) sea surface temperature (SST) anomalies can trigger an eastward atmospheric Kelvin wave propagating into the equatorial western Pacific, inducing an anomalous anticyclone over the subtropical Northwest Pacific (NWP) and resulting in prominent summer climate anomalies in the East Asia-Northwest Pacific (EANWP) region. However, the response of tropospheric temperatures and atmospheric Kelvin waves to the South Indian Ocean (SIO) SST anomalies is weak; as a result, the impact of the SIO SST anomalies on the EANWP summer climate is weak. The contrasting impacts of NIO and SIO SST anomalies on the EANWP summer climate is possibly due to the different mean state of SSTs in the two regions. In summer, the climatological SSTs in the NIO are higher than in the SIO, leading to a stronger response of atmospheric convection to the NIO SST anomalies than to the SIO SST anomalies. Thus, compared with the SIO SST anomalies, the NIO SST anomalies can lead to stronger tropospheric air temperature anomalies and atmospheric Kelvin waves to affect the EANWP summer climate.
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