近51 a甘肃夏季气温和降水极端事件变化

Abstract

Abstract: In this paper, the characteristics and trends of rainstorm events, severe drought events and anomalous maximum and minimum temperature events were investigated based on the daily data observed by 35 meteorological stations in Gansu Province and the reanalysis monthly data in summer (from June to August) during the period from 1960 to 2010, and the data were derived from National Climate Center and National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR). The main results show that the absolute intensity of rainstorm was lower than the relative intensity. The frequency of rainstorm events in summer was about 0.1 time a year in the Hexi Corridor in recent 51 years. In the Hedong region, however, the rainstorm frequency was in a decrease trend before the mid-1970s, and then the change trend was not significant. The variation of rainstorm intensity in these two areas was not significant, and the seasonal distribution was relatively dispersed. Rainstorm events occurred 10 days earlier compared with that after the mid-1980s. Severe drought events were sharply increased from 1991. The frequency of extremely high temperature was significantly increased but that of extremely low temperature decreased from the mid-1990s.

Key words: extreme weather, summer, air temperature, precipitation, rainstorm, Gansu Province

KONG Xiang-wei, TAO Jian-hong. Change of Extreme Temperature and Precipitation Events in Gansu Province in Summer in Recent 51 Years[J].Arid Zone Research, 2012, 29(6): 965-971.

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Change of Extreme Temperature and Precipitation Events in Gansu Province in Summer in Recent 51 Years

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