热带气象学报2011，Vol.27Issue(1)：101-108,8.DOI:10.3969/j.issn.1004-4965.2011.01.012
粤西北霜日的年际变化与大气环流异常的关系
INTERANNUAL VARIABILITY OF FROST-DAY IN NORTHWESTERN GUANGDONG AND RELATED CIRCULATION BACKGROUND
摘要
Abstract
Based on the observed data and the NCEP/NCAR reanalysis data from 1964 to 2006, the interannual variability of frost-day in northwestern Guangdong and related circulation background are analyzed. The frost-day in northwestern Guangdong are concentrated in December and January. The annual frost-day decreases remarkably after 1986, especially in the west and the south of northwestern Guangdong. The abnormal characteristics of general circulation for more frost-day cases (or in less frost-day cases) are similar in both December and January in northwestern Guangdong. In the years for more frost-day, the general circulation in December and January can be characterized as follows. The upper ridge and trough over Eurasian continent develop intensively, and the Mongolian high pressure is also intensified. The sea level pressure is abnormally higher in East Asia but lower in the northwestern Pacific. The cold surges are active in the South China, which lead to lower surface temperature and lower relative humidity in the low-middle layer of atmosphere, accompanied with stronger descending motion. Meanwhile, the ascending motion is stronger over Philippines. The abnormal circulation background for less frost-day years is basically inversed to that for more frost-day years.关键词
气候学/霜日/粤西北/年际变化/大气环流Key words
Climatology/ frost day/ northwestern Guangdong/ interannual variability/ circulation分类
天文与地球科学引用本文复制引用
李丽,简茂球..粤西北霜日的年际变化与大气环流异常的关系[J].热带气象学报,2011,27(1):101-108,8.基金项目
国家重点基础研究发展规划(973)项目(2009CB421404)资助 （973）
