地理学报 ›› 2020, Vol. 75 ›› Issue (3): 485-496.doi: 10.11821/dlxb202003004
马宁, 何丽烨, 梁苏洁, 郭军
收稿日期:
2018-11-09
修回日期:
2019-12-11
出版日期:
2020-03-25
发布日期:
2020-05-25
作者简介:
马宁(1985-), 女, 河南人, 硕士, 工程师, 主要从事短期气候预测与诊断分析。E-mail: esmaning@gmail.com
基金资助:
MA Ning, HE Liye, LIANG Sujie, GUO Jun
Received:
2018-11-09
Revised:
2019-12-11
Published:
2020-03-25
Online:
2020-05-25
Supported by:
摘要:
本文使用1981—2015年京津冀地区逐日气温和NCEP/NCAR再分析资料,分析了京津冀地区冬季冷空气过程的低频环流特征,以及西伯利亚高压(SH)的低频变化特征及其对京津冀冷空气过程的影响。分析表明,冬季京津冀气温和SH都存在10~30 d显著低频周期,且二者的低频分量之间存在显著的超前滞后相关。京津冀冷空气过程主要发生在低频气温从零位相到谷值的下降阶段,以及低频SH从峰值到零位相的下降阶段。随着京津冀气温和SH的10~30 d低频变化,亚洲近地面层和中层大气环流均表现出一个从西北向东南传播的低频变化周期。影响京津冀地区的低温异常最早出现在喀拉海附近并在亚洲高纬地区维持和积累,产生持续冷却作用;同时中层相应区域维持的强气旋性环流异常表明有持续的大气辐合,中层辐合下沉与近地面持续冷却作用配合形成近地面异常高压。异常高压伴随异常低温南下过程中与中层加强的东亚大槽配合,使京津冀地区处于整层北风异常中,易形成冷空气过程。
马宁, 何丽烨, 梁苏洁, 郭军. 京津冀冬季冷空气过程的低频特征及西伯利亚高压低频变化的影响[J]. 地理学报, 2020, 75(3): 485-496.
MA Ning, HE Liye, LIANG Sujie, GUO Jun. Low-frequency characteristics of winter-time cold air activity in the Beijing-Tianjin-Hebei region and the impacts of low-frequency variation of the Siberian High[J]. Acta Geographica Sinica, 2020, 75(3): 485-496.
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[1] | 张天宇, 陈海山, 孙照渤. 欧亚秋季雪盖与北半球冬季大气环流的联系[J]. 地理学报, 2007, 62(7): 728-741. |
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