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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Influence of Positive IOD Events on the Northeastward Extension of the Tibetan High and East Asian Climate Condition in Boreal Summer to Early Autumn
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Influence of Positive IOD Events on the Northeastward Extension of the Tibetan High and East Asian Climate Condition in Boreal Summer to Early Autumn

机译：积极的IOD事件对北夏北藏藏高和东亚气候条件东北延伸的影响

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摘要

Herein, (i) the remote influence of positive Indian Ocean Dipole (P-IOD) events in enhancing Tibetan High and (ii) its impact on the East Asian climate, from July to September, is analyzed based on composite analysis and linear baroclinic model experiment. In the equatorial Indian Ocean, convective activity enhances over the western part and suppresses over the eastern, which is associated with the zonal contrast of the sea surface temperature anomaly during P-IOD events. A lower-tropospheric clockwise circulation anomaly is evident from the eastern equatorial Indian Ocean where the suppressed convection is seen to the Indochina Peninsula. The streamlines arrive at the seas east of the Philippines, contributing to the enhancement of the monsoon trough. In the upper troposphere, crucial divergence anomaly over a wide area in the western North Pacific and the associated stronger-than-normal northward divergent winds toward East Asia cause strong northward negative-vorticity advection over the northern part of East Asia, contributing to the northeastward extension of the Tibetan High. This circulation anomaly contributes to both the significantly hot conditions in boreal summer and the late-summer heat over East Asia.
机译：在此，（i）基于复合分析和线性曲金模型，分析了对增强西藏高（II）对东亚气候影响的积极印度洋偶极子（P-IOD）事件的远程影响，其对东亚气候的影响实验。在赤道印度洋中，对流活动增强了西部，并抑制了东部，这与P-IOD事件中海表面温度异常的区域对比有关。从东部赤道印度洋是明显的，抑制对流被视为Indochina半岛的抑制对流，这是一个较低的。精湛的线索到达菲律宾东部的海洋，为季风槽的增强有贡献。在对流层的上层，在西北地区广域的广泛面积和向东北亚的相关北方发散风的关键异常异常导致东亚北部的北部部分北方负面漩涡平流，为东北部带来了贡献藏藏高。这种循环异常有助于北方夏季的大大热情和东亚夏季热量。

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