主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2011, Vol. 27 ›› Issue (5): 53-57.doi:

• 简报 • 上一篇    下一篇

2009年丹东罕见伏旱天气成因分析

李慧琳  高松影  徐璐璐  韩卫东  薛金艳   

  1. 丹东市气象局,辽宁 丹东118000
  • 出版日期:2011-10-30 发布日期:2011-10-30

Analysis of formation reason of rare summer drought in 2009 in Dandong, Liaoning province

LI Hui-lin  GAO Song-ying  XU Lu-lu  HAN Wei-dong  XUE Jin-yan   

  1. Dandong Meteorological Service, Dandong 118000, China
  • Online:2011-10-30 Published:2011-10-30

摘要: 2009年丹东不仅没有气象意义上的主汛期,而且发生了持续时间居历史第3位的伏旱天气。阐述了2009年丹东伏旱天气事实,探讨了伏旱成因机理。结果表明:造成2009年中国丹东伏旱天气的直接原因并不是历史上常见的西太平洋副热带高压西伸北跳和“588线”控制丹东地区。与之相反,伏旱事件期间,副热带高压位置稳定偏南,极涡位置主体偏北,中国丹东地区持续受西风带纬向环流控制,导致冷空气南下引导受阻,高层南亚高压在高温期有明显的北抬东伸。台风活动路径偏西、偏南,使副热带高压维持偏南而无明显西伸北跳,也是导致全区干旱少雨的主要原因。此外,全球气候变暖大背景和日益明显的城市化效应亦与伏旱天气事件的发生有关。

关键词: 罕见伏旱, 高温, 成因分析

Abstract: The main flood season is not significant in 2009 in Dandong, and summer drought occurs and its duration is the third in historical record. The characters and formation mechanism of summer drought were analyzed. The results show that the west pacific subtropical high and “588” line are not the direct reasons of this summer drought. Contrarily, the location of subtropical high is stable and leans to the south in this event and the location of polar vortex leans to the north. The zonal circulation of westerly belt controls Dandong area, which makes cold air moving to the south disturbed, so the south Asia high strengthens obviously and stretches eastwardly during the high temperature period. The path of typhoon moves to the west and further southward and it makes subtropical high southward, which is the important reason of summer drought in Dandong. Furthermore, the global climate warming and the urbanization are also the indirect factors of summer drought.

Key words: Rare summer drought, High temperature, Formation reason