Near-Surface Ozone Variations in East Asia during Boreal Summer

摘要: This study examined the variability of near-surface (850 hPa) ozone during summer in East Asia using simulations from 12 models participating Chemistry–Climate Model Initiative (CCMI). The empirical orthogonal function (EOF) analysis non-detrended shows that first (second) EOF mode is characterized by a monopole (dipole) structure describe 83.3% (7.1%) total variance. corresponding principle component (PC1) time series exhibits gradually increasing trend due to rising anthropogenic emission, whereas PC2 interannual variation. To understand drivers this variability, detrended also analyzed. two leading patterns ozone, EOF1 and EOF2, explain 37.0% 29.2% variance, respectively. regression results indicate positive anomaly associated with caused combination net production transport upper atmosphere. In contrast, EOF2 weakened western Pacific subtropical high La Nina decaying summer, which tends decrease monsoon precipitation, thus concentration China. Our suggest El Nino-Southern Oscillation (ENSO) plays key role driving tropospheric Asia.