摘要
应用奇异值分解(SVD)技术,研究了青藏高原地面加热场与东亚地区上空500hPa高度场及其东侧川渝地区春季气温场的时空联系和冷暖异常成因。结果表明:前期冬季青藏高原地面加热场与后期春季高度场的第一模态代表了两场间的主要耦合特征,具有显著的时空相关;前期冬季青藏高原地面加热场通过影响后期春季500hPa高度场,导致高原东侧川渝地区春季气温异常;冬季高原地面加热场强度偏强(弱),则后期春季东亚上空500hPa高度场偏高(低),川渝地区春季气温偏高(低);加热场—高度场—气温场之间的这种非同步联系,表明冬季青藏高原地面加热场异常,通过影响未来春季大气环流变化,是造成高原东侧川渝地区春季气温异常的重要原因。
Using the Singular Value Decomposition (SVD) technique, the relationship between the surface heating field in QinghaiXizang Plateau and 500 hPa geopotential height field of East Asia area and spring air temperature field of SichuanChongqing area and its forming anomalous causes of are studied. The result shows that the first mode, derived from SVD of the surface heating field in QinghaiXizang Plateau in previous winter and 500 hPa goepotential height field in next spring, represent the main coupling feature between the two fields with significant timespace correlations. The surface heating field in QinghaiXizang Plateau in previous winter result in the anomalies of air temperature of SichuanChongqing area in next spring by influencing 500 hPa geopotential height field. If the surface heating field in QinghaiXizang Plateau in winter is strong(weak), the 500 hPa geopotential height field over East Asia area is high (low), and the air temperature of SichuanChongqing area is also high (low) in next spring. This asynchronous connections between the surface heating field, geopotential height field and air temperature field indicate that the variation of the surface heating field in QinghaiXizang Plateau in winter, by influencing the general circulation, is the important reason for the anomaly of air temperature of SichuanChongqing area in next spring.
出处
《高原气象》
CSCD
北大核心
2003年第B10期32-39,共8页
Plateau Meteorology
基金
中国气象局成都高原气象研究所高原气象开放实验室基金
国家重点基础研究发展规划项目(G1998040900)
四川省科技厅重点科技项目(2000 03 21)
"十五"四川省重点攻关项目(DING018-01)资助
关键词
青藏高原
加热场
大气环流
春季气温
奇异值分解
Qinghai-Xizang Plateau
Heating field
General circulation
Air temperature in spring, SVD technique
