双月刊

ISSN 1006-9895

CN 11-1768/O4

1961~2017年华南区域性持续高温过程年际变化成因分析
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作者单位:

1.广东省气候中心;2.中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室

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基金项目:

国家自然科学基金项目(41575043),国家重点基础研究发展计划(2018YFC1505801)


Analysis on Interannual Variation of Regional Persistent High-Temperature Events in South China during 1961-2017
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Affiliation:

1.Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,China Meteorological Administration;2.College of Ocean and Meteorology,Guangdong Ocean University

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    摘要:

    本文利用近60年我国气象站的日最高气温、降水资料以及NCEP/NCAR大气多要素等全球格点资料,基于华南区域性持续高温历史过程定义夏季区域性持续高温指数(RPH),分析影响华南夏季区域性持续高温年际异常的大气环流及下垫面海温因子。主要结果表明,在华南夏季持续高温偏重年,华南区域对流层高、中、低层均受反气旋性环流异常控制,在华南上空垂直方向上表现出深厚的大气动力和热力异常,华南夏季持续性高温的年际异常也与欧亚东传波列和热带大范围环流异常密切联系。热带印度洋、热带太平洋以及北大西洋三大洋海温异常共同影响华南区域性持续高温的年际异常,其中热带印度洋、太平洋海温异常主要有利于南海-西太平洋反气旋性环流异常的形成,使副热带高压偏西偏强,北大西洋海温异常则有利于高层欧亚波列的加强,使南亚高压在东亚地区加强东伸。在各区域海温异常共同作用下,华南在对流层高、低层反气旋性环流的控制下,大气产生强烈的下沉运动,一方面大气绝热增温,另一方面使大气晴空少云、地面接收更多的太阳辐射,从而有利于高温偏重。

    Abstract:

    This study investigates the general circulation and external forcing factors which synergistically impact interannual variation of regional persistent high-temperature events in South China (RPH) during summer. Several observational datasets for nearly 60 years from meteorological stations and the NCEP/NCAR Global Reanalysis Data are used. The RPH index is defined based on historical processes of regional persistent high temperature in South China. Under the control of anti-cyclone throughout the troposphere, deep atmospheric dynamics and thermal anomalies occupy vertically over South China during the years with high RPHs. The interannual variation of RPH of South China is also closely relative to eastward-propagating wave trains over Eurasia and large circulation anomaly in the tropics due to the joint influence of sea surface temperature anomaly (SSTA) from tropical Indian Ocean, tropical Pacific and North Atlantic. The generation of anti-cyclone anomaly over South China Sea-western Pacific, which leads to the westward extension of strengthened western Pacific subtropical high, is resulted from the SSTA of tropical Indian Ocean and tropical Pacific. Meanwhile, the enhancement of wave trains over Eurasia in the upper troposphere, which leads to the eastward extension of strengthened South Asia high, is resulted from the SSTA of North Atlantic. Thus, strong descending is generated under the control of anti-cyclone throughout the troposphere over South China with combined effect of these key regions of oceans. And the high RPH is resulted from this strong descending which brings both adiabatic heating and strengthened solar radiation heating at the surface.

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  • 收稿日期:2021-09-19
  • 最后修改日期:2022-04-11
  • 录用日期:2022-05-30
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