近40年玉树地区地面气压变化特征分析

Analysis on Change Characteristics of Surface Pressure in Yushu Area in Recent 40 Years

利用玉树地区近40年地面气压的逐月观测资料,分析了该地区地面气压的年代际、年、季和月的变化特征,并用气候突变理论对其进行了检验。结果表明:1971—2010年玉树地区地面气压在20世纪70—90年代有上升趋势,90年代之后呈下降趋势。年、季、月平均地面气压随时间的变化呈明显的上升趋势。年、季的气压倾向率分别为0.230、0.227、0.214、0.177、0.298 h Pa/10年,其中以冬季的平均地面气压上升趋势最为显著。各月平均地面气压都有上升趋势,但变化速率各有不同,以2月的上升趋势最为显著,上升趋势最小是11月。

The climate change characteristics of decade, annual, seasonal and monthly surface pressure in Yushu Area were analyzed based on the observed data of surface pressure in Yushu Area in recent 40 years.The results showed that there was an increasing trend in the period of 1970s to 1990s and a obvious decreasing trend in the after of 1990s ;the trend of annual,seasonal and monthly average surface pressure was significant during the whole analyzed period ,with a obvious increasing trend.The rate of annual,seasonal pressure tendency were 0.230,0.227,0.214,0.177,0.298 hPa/ per 10 years ,the overage surface pressure increasing tendency was the most significant in winter.The trend of monthly average surface pressure showed clearly difference ,with a sufficiently increasing trend ,the increasing tendency was the most significant in February ,the increasing tendency was the minimum in November.