Analysis of a Large Scale Cold Air Weather Process in China during January 2021

Baojun Wu
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Abstract

This study uses data provided by the National Meteorological Information Center of China, Japan Meteorological Agency (JMA) and National Oceanic Atmospheric Administration (NOAA) Physical Sciences Laboratory of the USA to analyze a cold air weather process at the beginning of January 2021. Synoptic analysis is mainly used to summarize synoptic laws or patterns based on observational data, and describe and infer weather processes. The main conclusions are as follows: The cold air travels south along the northwest path, affecting most of China. During the cold wave process, the first cold air is weak, which has a certain cooling effect on northern China. The second cold air was guided by the low vortex, the accumulation in the transverse groove of Mongolia was strengthened, and the cooling effect was significant. The southwest jet showed an increasing trend, and the water vapor transport conditions were good. However, due to the relatively gentle southern branch system, the warm and humid air flow was weak and the precipitation level was small. The purpose of this study is to better understand a large-scale cold air weather process in January 2021 in China.
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2021年1月中国一次大尺度冷空气天气过程分析
本研究利用中国国家气象信息中心、日本气象厅(JMA)和美国国家海洋大气管理局(NOAA)物理科学实验室提供的数据,分析了2021年1月初的一次冷空气天气过程。天气分析主要是根据观测资料总结天气规律或模式,描述和推断天气过程。主要结论如下:冷空气沿西北路径南下,影响了中国大部分地区;在寒潮过程中,第一股冷空气较弱,对华北地区有一定的降温作用。第二次冷空气受低涡引导,蒙古横槽内积累增强,降温效果显著。西南急流呈增加趋势,水汽输送条件良好。但由于南支系统相对温和,暖湿气流偏弱,降水偏少。本研究的目的是更好地了解2021年1月中国大尺度冷空气天气过程。
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