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高原气象  2017, Vol. 36 Issue (6): 1499-1511    DOI: 10.7522/j.issn.1000-0534.2016.00109
论文     
乌拉尔山阻塞与北大西洋涛动的关系及其对中国冬季天气的影响
肖贻青
陕西省气象台, 陕西 西安 710014
Relationship between Ural Blocking and the North Atlantic Oscillation and Their Influence on Winter Weather over China
XIAO Yiqing
Shaanxi Meteorological Observatory, Xi'an 710014, Shaanxi, China
 全文: PDF(45137 KB)  
摘要: 通过对2008年1-2月中国南方一次严重低温雨雪冰冻天气的分析,发现期间的两次乌拉尔山阻塞过程都对其有重要影响,且均伴随着北大西洋涛动正位相事件(North Atlantic Oscillation+,NAO+),但由于其发展演变位置的不同对中国的温度和降水造成了截然不同的影响。因此利用ERA-Interim再分析资料计算了1979-2014年冬季乌拉尔山阻塞的平均活动中心,将NAO+相关乌拉尔山阻塞根据位置变化分为偏北型、偏南型、偏东型和偏西型四类阻塞,研究其对中国冬季天气的影响。结果表明,偏南型和偏东型的乌拉尔山阻塞更容易引起中国冬季的异常降温;研究还发现与NAO+相关的乌拉尔山阻塞的发展演变总是滞后NAO+事件3~6天,其位置的变化主要受前期NAO+期间的纬向风异常分布及急流位置和强度的影响;另外,对1979-2014年冬季乌拉尔山阻塞和NAO的统计结果显示,绝大部分的乌拉尔山阻塞发生时伴随了NAO事件,NAO+期间比NAO负位相(North Atlantic Oscillation-,NAO-)期间更容易产生乌拉尔山阻塞,但伴随NAO-事件的阻塞强度更大,引起中国冬季的降温也更明显;进一步研究表明,单一的NAO事件期间引起中国冬季温度的变化非常微弱,因此,乌拉尔山阻塞可以作为NAO事件影响中国寒冷天气的媒介。
关键词: 乌拉尔山阻塞北大西洋涛动寒冷天气    
Abstract: A case study on persistent snow-ice weather over South China from January to February in 2008 was investigated. It is shown that two Ural blocking (UB) events that have important influence on this extreme cold weather for different location, are associated with positive North Atlantic Oscillation events (NAO+). So NAO+ related UB events (NAO+ UB) are classified to four patterns as a result of their different locations, according to statistical analysis for location of UB in winter from 1979 to 2014, which are northward, southward, eastward, and westward UB events. Composited analysis reveals that the influence of southward and eastward UB events on winter cold events over China is more intense than that of the northward and westward UB events. A further study shows the NAO+ UB events are lag the NAO+ events by 3~6 days for their different locations. The result shows that the variety of zonal wind anomalies over Ural regions may be the main cause that lead to different location for NAO+ UB at the occurrence condition of NAO+. Furthermore, a statistical result for UB events and NAO events in winter from 1979 to 2014 shows that most UB events can be associated with NAO events, especially NAO+ UB events are far more than NAO- related UB (NAO- UB), and NAO+ pattern is more in favore of UB events. Therefore, the intensity of NAO- UB is stronger than NAO+ UB, and lead to more intense cold weather over China. Moreover, it is shown that the impact of NAO+ and NAO- events being absent with UB events on winter air temperatures over China is extremely weak. This hints that the UB events may be a bridge that links the winter weather over China and NAO events.
Key words: Ural Blocking    North Atlantic Oscillation    cold weather
收稿日期: 2016-05-23 出版日期: 2017-12-20
ZTFLH:  P44  
作者简介: 肖贻青(1990-),女,陕西渭南人,助理工程师,主要从事气候统计、中小尺度天气的研究.E-mail:xxyyqq1222@163.com
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引用本文:

肖贻青. 乌拉尔山阻塞与北大西洋涛动的关系及其对中国冬季天气的影响[J]. 高原气象, 2017, 36(6): 1499-1511.

XIAO Yiqing. Relationship between Ural Blocking and the North Atlantic Oscillation and Their Influence on Winter Weather over China. PLATEAU METEOROLOGY, 2017, 36(6): 1499-1511.

链接本文:

http://www.gyqx.ac.cn/CN/10.7522/j.issn.1000-0534.2016.00109        http://www.gyqx.ac.cn/CN/Y2017/V36/I6/1499

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