On the temporal and spatial structure of troposphere-to-stratosphere transport in the lowermost stratosphere over the Asian monsoon region during boreal summer

摘要: This study produced a novel characterization of the troposphere-to-stratosphere transport (TST) over Asian monsoon region during boreal summer, using comprehensive analysis 60-day backward trajectories initialized in stratosphere. The trajectory datasets were derived from high-resolution Lagrangian particle dispersion model (FLEXPART) simulation driven by wind fields acquired National Center for Environmental Prediction (NCEP). results indicate that distribution residence time (tTST) tropopause-crossing lowermost stratosphere represents horizontal signature summer monsoon. Vertically, tTST can be roughly separated into two layers: consistent lower layer with <5 days forming narrow band, corresponding to ∼3 km thick following location tropopause, and an upper at larger distance local tropopause. maximum was ∼20 days, especially within high anticyclone its confinement effects. In general, overall geographical dehydration points not coincident tropopause crossing. TST trajectories, which stratosphere, underwent their cold mostly tropics subtropics 1–4 after event; they characterized wide range temperature differences, mean value 3–12 K. vertical extent influence tropospheric intrusion on exhibited peak ∼16.5–18.5 km, uppermost height ∼21 km.