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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Changes in clustered extreme precipitation events in South China and associated atmospheric circulations
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Changes in clustered extreme precipitation events in South China and associated atmospheric circulations

机译：华南地区成群极端降水事件的变化及相关的大气环流

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摘要

Previous studies have documented that the summer precipitation over South China (SC) has experienced a prominent inter-decadal increase in 1992/1993, and the possible mechanism has been well revealed. The aim of this study is to investigate the changes in extreme precipitation and clustered extreme precipitation events in recent decades using station observations and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data. The results indicate that extreme precipitation also experienced a significant inter-decadal increase around 1992/1993. Significant changes can also be found in the associated atmospheric circulations, such as the western North Pacific subtropical high (WNPSH) and the westerly jet stream over East Asia. In addition, the water vapour transport (WVT) related to extreme precipitation differed from mean conditions. For extreme precipitation events, the WVT from the Northwest Pacific and Indian Oceans was much stronger when compared with mean precipitation. When extreme precipitation events were clustered, the increased WVT mainly originated from the South China Sea and Northwest Pacific Ocean. Further analysis indicates that the WVT increased from the Indian Ocean but decreased from the Northwest Pacific after 1992/1993; this finding explains the significant increase in the clustered extreme precipitation events over SC after 1992/1993. In addition, the atmospheric stratification has become more unstable since 1992/1993.
机译：先前的研究表明，1992/1993年华南地区夏季降水经历了年代际显着增加，其可能的机理已被充分揭示。本研究的目的是使用台站观测资料和国家环境预测中心/国家大气研究中心（NCEP / NCAR）的再分析数据，调查近几十年来极端降水和聚集极端降水事件的变化。结果表明，极端降水在1992/1993年左右也经历了年代际显着增加。在相关的大气环流中，例如北太平洋副热带高压西部（WNPSH）和东亚上空的西风急流，也可以发现重要的变化。此外，与极端降水有关的水蒸气传输（WVT）与平均条件不同。对于极端降水事件，与平均降水量相比，西北太平洋和印度洋的WVT强得多。当极端降水事件聚集时，增加的WVT主要来自南中国海和西北太平洋。进一步的分析表明，1992/1993年以后印度洋的WVT上升，而西北太平洋的WVT下降;这一发现解释了1992/1993年以后，南极地区的成群极端降水事件显着增加。此外，自1992/1993年以来，大气分层变得更加不稳定。

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