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基于Polar WRF研究分析南极Dome A极端低温事件

王一丞1,2,谢爱红1,丁明虎3,效存德4   

  1. 1.中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室 2.中国科学院大学 3.中国气象科学研究院 4.北京师范大学 地表过程与资源生态国家重点实验室
  • 收稿日期:2018-01-02 修回日期:2018-03-26 出版日期:2019-10-28 发布日期:2019-10-28
  • 通讯作者: 谢爱红
  • 作者简介:王一丞(1993—),男,甘肃武威人,2015年在兰州大学获学士学位,现为中国科学院西北生态环境资源研究院在读硕士研究生,从事极地气象研究. E-mail:wangyicheng@lzb.ac.cn
  • 基金资助:
    国家自然科学基金面上项目(41476164;41671073;41425003)资助

Extreme low temperature events in Dome A, Antarctica, simulated by Polar Weather Research and Forecast Model

WANG Yicheng1,2, XIE Aihong1, DING Minghu3, XIAO Cunde4   

  • Received:2018-01-02 Revised:2018-03-26 Online:2019-10-28 Published:2019-10-28
  • Contact: 谢爱红,E-mail:xieaih@lzb.ac.cn

摘要: 南极作为地球的寒极,其最高点Dome A地区于2013年8月1日气温达到-93.0 ℃的极低值。利用Polar WRF 3.8.1模式,对发生在南极Dome A地区的3次极端低温事件进行数值模拟分析。通过与自动气象站实测数据对比验证,模拟效果较为理想结果表明:印度洋和大西洋交界方向的高压加强,其高压脊开始向南极内陆延伸,控制Dome A地区气压升高,使得该地区天气晴好,云量极低,为极端低温事件发生奠定基础;同时,南极南极中心冷涡加强,长时间的冷平流和稳定的逆温层为Dome A地区提供了足够的降温条件,并且加强了夜间辐射降温效应,稳定的垂直场、极低的向下长波辐射使得Dome A地区的极端低温事件得以维持。

关键词: 南极, Dome A, 极端低温, Polar WRF模式

Abstract:

Antarctica is the coldest continent on the earth. The temperature of the highest point in Antarctica, Dome A, has reached -90.0 . Three extreme low temperature events are simulated through Polar Weather Research and Forecast Model (WRF) 3.8.1. Compared with the observation of automatic weather station at Dome A, the simulated results are satisfactory. Diagnoses are made based on the simulation outputs. The following results were obtained: the enhancement of the high-pressure center between the Indian Ocean and the Atlantic Ocean and its high-pressure ridge stretching into Antarctic plateau led the pressure rising at Dome A and made this region fine and cloudless, which were the foundation for the extreme low temperature events;

the enhancement of the Antarctic cold vortex, longstanding cold advection and stable thermal inversion layer provided enough cooling factors and strengthen the radiation cooling effect at night; stable vertical field and extremely low downward longwave radiation made the extreme cold events continue. However, more in-situ observations are required, especially in the vast interior of Antarctica.

Key words: Antarctica, Dome A, extreme low temperature events, Polar WRF