| 摘要: |
| 基于中国气象局逐日降水和日最低气温及NCEP/NCAR再分析数据集,本文分析了1981—2022年内蒙古强冷空气事件的气候特征及大气环流型,发现就强冷空气事件线性变化趋势空间分布特征来看,2月强冷空气次数增加的站点最多。分析各区冷干型、冷湿型强冷空气次数,1区、2区冷干型强冷空气过程多于冷湿型,3区冷湿型强冷空气过程多于冷干型。长期变化趋势只有3区冷干型、冷湿型强冷空气次数都为减少趋势,1区、2区冷湿型强冷空气次数为增加趋势,1区、2区冷干型强冷空气次数为减少趋势。各区域形成冷干型强冷空气过程的主要条件是需要有西北气流影响该区域,而形成冷湿型强冷空气过程的主要条件是东南的暖湿气流输送到该区域。 |
| 关键词: 内蒙古;强冷空气;冷干;冷湿 |
| DOI： |
| 投稿时间：2023-12-18修订日期：2024-04-26 |
| 基金项目:2022LHMS04004 |
|
| Spatiotemporal Characteristics and Atmospheric Circulation Patterns of Strong Cold Air in Inner Mongolia |
| GAO Jing,SHI Rulin,CHEN Jinqi,WANG Huimin |
| (Inner Mongolia Climate Center) |
| Abstract: |
| Using daily precipitation and daily minimum temperature data from the China Meteorological Administration, as well as the NCEP/NCAR reanalysis dataset, this article analyzes the climatic characteristics and atmospheric circulation patterns of strong cold air in Inner Mongolia from 1981 to 2022. The results show that, in terms of the spatial distribution of linear trends in strong cold air events, the stations with the increase in cold air events are mostly observed in February. We further analyze the frequency of cold-dry and cold-wet type strong cold air events in different regions. Regions 1 and 2 show more cold-dry type events, while Region 3 encounters more cold-wet type events. Long-term trends indicate a decreasing tendency in the frequency of cold-dry and cold-wet type strong cold air events in Region 3, while Regions 1 and 2 show an increasing trend in cold-wet type events and a decreasing trend in cold-dry type events. The primary condition for the formation of cold-dry type strong cold air processes in each region is the influence of northwest airflow, whereas the formation of cold-wet type strong cold air processes requires the transport of warm and moist airflow from the southeast. |
| Key words: Inner Mongolia; Strong cold air; Cold-dry; Cold-wet |
