关键词: 华北地区, 降水蒸发差, 副热带高压, 交叉小波变换

Abstract: To reveal the restrictions of atmospheric general circulation and the effects of interaction between atmosphere and ocean on the water resources in Northern China,the relationship between the movement of subtropical high(STH) location over the Western Pacific and the difference of precipitation and evaporation(DPE) in Northern China were analyzed by using the method of wavelet cross-correlation and cross wavelet transform.The results showed that the water resource shortage was relieved in the south of Northern China since 2000,but not changed in the north of Northern China including Beijing.There were significant correlation oscillations of inter-annual and inter-decadal scale between the DPE in Northern China and the location of STH ridge line and northern limit,and the coherence of inter-decadal correlation between the DPE and the STH ridge line was higher than the coherence of inter-decadal correlation between the DPE and the STH northern limit.The significance of inter-decadal correlation was exhibited at a stage and the inter-annual correlations were localized in the time space during 1955 to 2008.The results indicated that the main reason of the increasing of DPE in the south of Northern China since 2000 was increasing precipitation in the region,which resulted from the STH ridge line north-extending and keeping as anticyclonic circulation.The abnormal intensity and location of the STH had obvious effects on the inter-annualand inter-decadal variations of the DPE in North China.

Key words: Northern China, Northern China, Difference between precipitation and evaporation, Subtropical high, Cross wavelet transform