Exploring the characteristics of global surface pressure variations and their relationship with precipitation based on the eigen microstate method
By using ERA5,GPCP reanalysis dataset,and climate indices provided by the NOAA,this study discusses the characteristics of global surface pressure changes from 1950 to 2022 and its relationship with global precipitation and circulation changes based on the eigen microstates and traditional meteorological methods.Results show that the first leadingeigen microstate of global surface pressure is dominated by coherent changes in the Antarctic,significantly related to the Antarctic oscillation.The second mode mainly features consistent changes in the Arctic,which is significantly related to the Arctic Oscillation(AO)and North Atlantic Oscillation(NAO).The third mode exhibits an east-west dipole structure in the tropical Pacific,closely related to the El Niño-Southern Oscillation(ENSO).Each mode is primarily characterized by annual variations,and there are significant regional differences in their impacts on global precipitation.When the first mode is in a positive phase,the Antarctic polar vortex strengthens,causing an increase in precipitation in high-latitude regions and a decrease in mid-latitude regions of the Southern Hemisphere.The second mode is closely related to precipitation in the mid-to-high latitudes of the Northern Hemisphere,with its positive phase corresponding to increased Arctic precipitation and decreased precipitation in the North Atlantic and its surrounding areas.The third mode could affect global precipitation,mainly manifested as decreased precipitation in the western Pacific and increased precipitation in the East Central Pacific.
国家科技期刊平台
NSTL
万方数据
