摘要
运用多年全球感热通量数据进行经验正交函数(EOF)分析,得到感热异常关键区。运用小波分析等方法发现,全球地表感热异常存在振荡现象,东半球在年际、年代际尺度上,地表感热异常主要以青藏高原东、西部的反相以及高原西部和北非的反相为热力异常振荡的主要分布形态。再运用中国月平均降水资料进行EOF分析,得到各个感热异常关键区与中国华北、江淮和华南地区汛期降水异常的相关关系,其中北非、青藏高原西北部和马来半岛这3个区域的感热距平之间有较大的相关关系,且感热异常季节变化较小,对我国东部地区降水的影响比较稳定,持续性较好。
The exchange of sensible heat is a primary form of energy exchange between the ground and atmosphere. The Empirical Orthogonal Function（ EOF） analyses of the NCEP/NCAR reanalysis data of global monthly means of ground surface sensible heat net flux from 1948 to 2002 reveal six sensible heat flux anomaly areas in the Eastern Hemisphere, and the oscillation phenomena of sensible heat fluxes between North Africa and the Tibetan Plateau. And the EOF analyses of the monthly precipitation data at 160 stations in China in 1951-2000 uncover the correlaton of the sensible heat oscillation phenomena and the rainy season precipitation anomaly of North China,South China and the Changjiang-Huaihe River valley. The sensible heat flux anomalies among North Africa ,the northwest of the Tibetan Plateau and Malay peninsular are close correlated each other and they have more stable and persistent influence on the precipitation in Eastern China.
出处
《南京气象学院学报》
CSCD
北大核心
2006年第5期620-626,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金重点资助项目(40233037)
国家重点基础研究发展规划项目(2004CB418300)
关键词
感热
振荡
降水异常
EOF分析
sensible heat
oscillation character
precipitation anomaly
EOF analysis
