Variation Characteristics of Summer Precipitation in Tarim River Basin and Its Relationship with Sea Surface Temperature
To investigate the variation characteristics of summer precipitation and its relationship with sea surface temperature(SST)in Tarim River Basin,this paper uses the 1991-2020 daily precipitation observation data provided by Xinjiang Meteorological Information Center and the NCEP reanalysis data from 1979 to 2021 to analyze the spatio-temporal variation of summer precipitation and its related SST anomalies in Tarim River Basin based on the conventional meteorological statistical method.The results show that:(1)The summer precipitation in Tarim River Basin has an increasing trend from 1991 to 2020 and the increase rate is 5.31%per decade.(2)The year 2009 is an abrupt year with the increase of summer precipitation in the basin,but the change is not significant.(3)The summer precipitation in Tarim River Basin has a period cycle of about 3 years and 6 years respectively,and the main period cycle is about 3 years.Summer precipitation in Tarim River Basin mainly has the consistent variation and the east-west reverse variation,showing obvious inter-annual variation characteristics.The uniform type of precipitation distribution is correlated to the SST anomalies in the Indian Ocean,the central and eastern Pacific Ocean and the low latitude Atlantic Ocean in the previous winter(or previous spring),while the east-west inverse type is associated with the SST anomalies in the middle and low latitude Pacific Ocean(or the Arabian Sea area in the previous spring)in the previous winter.The composite results of the previous winter SST anomaly to the summer precipitation anomaly are relatively more significant,having passed the 95%significance test.
Tarim River Basinchanges in precipitationMutation testWavelet analysissea surface temperature(SST)
NETL
NSTL
万方数据
