Impact of 500hPa height field anomaly on precipitation and temperature change over arid central Asia over the past 100 years

摘要

Based on the gridded monthly precipitation and temperature data, and the monthly 500hPa height field data, the influence of 500hPa height change on precipitation and temperature over arid central Asia is analyzed. The results show that the summer rainfall and temperature anomaly in arid central Asia relates largely to those of large-scale meridional circulation. The winter precipitation and temperature anomaly over arid central Asia is related mainly to the singularities of zonal circulations at extra-tropic area. The main large scale synoptic systems to influence the climate change of arid central Asia include Ural Mountains trough (ridge), west Pacific sub-tropic high and Arabia trough (ridge).