The Variations of Outgoing Longwave Radiation in East Asia and Its Influencing Factors

Outgoing longwave radiation (OLR) data are one of the key factors in studying balance earth–atmosphere system East Asia. It is great significance to explore influence on OLR. This paper processes nearly 19 years, from September 2002 February 2022, and conducts in-depth research using exponential smoothing method, empirical orthogonal decomposition (EOF), correlation analysis, other methods. We found that spatial distribution OLR zonal symmetry gradually decreases with increase latitude. Using EOF it total variance contribution first four decomposed features exceeds 70%, overall change trend four-time coefficients past years all show a downward trend. positively correlated column water vapor (TCWV), air temperature (AT), cloud top (CTT), but negatively pressure (CTP). has similar TCWV AT, while between CTP opposite two parameters. In most parts Asia, CTT 0.8. The value affected by various meteorological positive 30° N 60° significantly TCWV, CTT; negative more CTP. At 0–25° N, CTT, AT.