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North atlantic modulation of interdecadal variations in hot drought events over northeastern China

机译：北大西洋调制中国东北地区热干旱事件中的跨界变化

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摘要

Based on the long-term reanalysis datasets and the multivariate copula method, this study reveals that the frequency of summer hot drought events (SHDEs) over northeastern China (NEC) shows interdecadal variations during 1925-2010. It is revealed that the summer sea surface temperature (SST) over the North Atlantic has a significant positive correlation with the frequency of SHDEs over NEC on the decadal time scale, indicating a potential influence of the Atlantic multidecadal oscillation (AMO). Further analyses indicate that during the positive phases of the AMO, the warming SST over the North Atlantic can trigger a stationary Rossby wave originating from the North Atlantic, which splits into two wave trains propagating along two different routes. One is a zonally orientated wave train that resembles the Silk Road pattern, whereas the other is an arching wave train that resembles the polar-Eurasian pattern. A negative (positive) phase of the Silk Road pattern (polar-Eurasian pattern) may result in the weakened westerly wind along the jet stream, the downward vertical motion, and the anomalous positive geopotential center over NEC, providing favorable conditions for precipitation deficiency and high temperature and resulting in increased SHDEs. Thus, the Silk Road pattern and the polar-Eurasian pattern serve as linkages between the AMO and SHDEs over northeastern China in summer on the interdecadal time scale. Model simulations from CAM4 perturbed with warmer SST in the North Atlantic show precipitation deficiency and high temperature conditions over northeastern China in summer, supporting the potential impacts of the North Atlantic SST on SHDEs over northeastern China. The results suggest that the phase of the AMO should be taken into account in the decadal prediction of SHDEs over northeastern China in summer.
机译：本研究基于长期重新分析数据集和多元拷贝方法，揭示了中国东北（NEC）夏季热干旱事件（Shdes）的频率在1925 - 2010年期间显示了跨界变化。据透露，北大西洋夏天海面温度（SST）与十二次时间尺度的SHDES频率具有显着的正相关性，表明大西洋多型振荡（AMO）的潜在影响。进一步的分析表明，在AMO的正阶段，北大西洋的变暖SST可以引发源自北大西洋的固定罗斯比波，这分成了沿着两条不同路线传播的两个波动列车。一个是一种像丝绸之路模式一样类似于丝绸之路模式的自由定向波动火车，而另一个是一种类似于极地欧亚模式的拱形波动火车。丝绸道路图案（极地欧洲图案）的负（正）阶段可能导致沿着喷射流，向下垂直运动和NEC的异常正面地球势中心削弱，为降水缺陷提供有利条件高温并导致SHDES增加。因此，丝绸之路图案和极地欧洲模式用作夏季东北地区盟友和Shdes之间的联系在夏季的跨越时间尺度。 CAM4的模型模拟在北方大西洋展示北大西洋展示中扰动了温暖的SST，夏季东北地区的降水缺陷和高温条件，支持北大西洋SST在中国东北部的潜在影响。结果表明，在中国东北夏天，应考虑到amo的阶段。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2116-2116|共1页
  • 作者

    L.I. Huixin; H.E. Shengping; G.A.O. Yongqi;

  • 作者单位

    Nansen- Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    Nansen- Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    Nansen- Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

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