長江中下游冬季兩類冷空氣活動事件的環(huán)流差異及其與急流的關系

doi:10.12306/2022jms.0089

首頁 > 過刊瀏覽>2023年第43卷第3期 >326-336. DOI:10.12306/2022jms.0089

長江中下游冬季兩類冷空氣活動事件的環(huán)流差異及其與急流的關系
DOI:
                        10.12306/2022jms.0089
                    
CSTR:
                        
                    
作者:
                        
                        
                    
作者單位:
作者簡介:
通訊作者:
中圖分類號:P466
基金項目:國家自然科學基金項目資助(41930969)

Circulation differences between two types of winter cold air activity events in the middle-lower reaches of the Yangtze River and their relationship with the jet stream

Author:

Affiliation:

Fund Project:

摘要

圖/表

訪問統計

參考文獻

相似文獻

引證文獻

資源附件

文章評論

摘要:

利用1981—2020年臺站觀測的降水和最低氣溫資料,從長江中下游地區(qū)冬季冷空氣活動事件中分出"降溫有降水"和"降溫無降水"兩類事件(簡稱為"冷濕"和"冷干"事件),結合再分析資料,分析兩類事件的冷暖空氣活動特征和大氣環(huán)流差異,進而探討其與急流的聯系。結果發(fā)現,長江中下游冷空氣活動事件發(fā)生頻次逐年減少,其中冷干事件發(fā)生頻次逐年減少,冷濕事件發(fā)生頻次顯著增加,且冷濕事件的降溫幅度大于冷干事件。冷濕事件發(fā)生時,高層副熱帶急流北移、極鋒急流偏弱,中層存在傾斜槽脊、副熱帶高壓偏西,低層西伯利亞高壓增強,有來自西南的暖濕氣流在長江中下游地區(qū)輻合上升;冷干事件發(fā)生時,高層副熱帶急流偏弱、極鋒急流偏強,中層槽脊傾斜程度偏弱、副熱帶高壓偏東,低層西伯利亞高壓南移,有來自北方的偏干氣流在長江中下游地區(qū)輻散下沉。此外,與冷濕事件相比,冷干事件過程中急流強度指數和經向風位置指數的波動更加頻繁,冷空氣活動持續(xù)時間更短。

Abstract:

Based on the precipitation and minimum temperature data observed at the stations from 1981 to 2020, two types of winter cold air activity events in the middle-lower reaches of the Yangtze River were identified, which are strong cooling events with precipitation and only strong cooling events without precipitation(referred to as "cold-wet" and "cold-dry" events), respectively. The atmospheric circulation differences and the characteristics of cold and warm air activities in the two type events, and their connection with the jet stream are also examined. Results show that the frequency of cold air activity events in the middle-lower reaches of the Yangtze River decreases year by year, among which the frequency of cold-dry events decreases and the frequency of cold-wet events increases significantly. In addition, the cooling amplitude of cold-wet events is greater than that with no precipitation. When cold-wet events occur, the upper-level subtropical jet moves northward and the polar front jet is weaker. There is a tilting ridge in the middle level and the subtropical high is located westward. In the lower-level,the Siberian high is strengthened and the warm and humid air flowing from the southwest converges and ascends in the middle-lower reaches of the Yangtze River. However, when cold-dry events occur, the subtropical jet in the upper level is weaker and the polar front jet is stronger. The trough and ridge in the middle level are weaker and the subtropical high is located eastward.In the lower level, the Siberian high is located southward and the dry air flowing from the north diverges and sinks in the middle-lower reaches of the Yangtze River. In addition, compared with cold-wet events, the jet stream intensity index and the meridional wind position index fluctuate more frequently during cold-dry events, and the cold air activity duration is shorter.

參考文獻

相似文獻

引證文獻

引用本文

朱璇,張耀存,尹婧楠.長江中下游冬季兩類冷空氣活動事件的環(huán)流差異及其與急流的關系.氣象科學,2023,43(3):326-336 ZHU Xuan, ZHANG Yaocun, YIN Jingnan. Circulation differences between two types of winter cold air activity events in the middle-lower reaches of the Yangtze River and their relationship with the jet stream. Journal of the Meteorological Sciences,2023,43(3):326-336

復制

文章指標

點擊次數:
下載次數:
HTML閱讀次數:
引用次數:

歷史

收稿日期:2022-08-26
最后修改日期:2022-09-18
錄用日期:
在線發(fā)布日期: 2023-07-27
出版日期: 2023-06-15

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關視頻

文章指標

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒 激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關視頻

文章指標

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说