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The Simulation of Stratospheric Water Vapor Over the Asian Summer Monsoon in CESM1(WACCM) Models
Author(s) -
Wang Xinyue,
Wu Yutian,
Tung Wenwen,
Richter Jadwiga H.,
Glanville Anne A.,
Tilmes Simone,
Orbe Clara,
Huang Yi,
Xia Yan,
Kinnison Douglas E.
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2018jd028971
Subject(s) - stratosphere , troposphere , climatology , anticyclone , environmental science , water vapor , atmosphere (unit) , atmospheric sciences , climate model , monsoon , meteorology , climate change , geology , oceanography , geography
Previous observational studies have found a persistent maximum in stratospheric water vapor (SWV) in the upper troposphere lower stratosphere (UTLS) confined by the upper‐level anticyclone over the Asian summer monsoon region. This study investigates the simulation of SWV in the Community Earth System Model, version 1 with the Whole Atmosphere Community Climate Model as its atmospheric component [CESM1(WACCM)]. CESM1(WACCM) generally tends to simulate a SWV maximum over the central Pacific Ocean, but this bias is largely improved in the high vertical resolution version. The high vertical resolution model with increased vertical layers in the UTLS is found to have a less stratified UTLS over the central Pacific Ocean compared with the low vertical resolution model. It therefore simulates a steepened potential vorticity gradient over the central Pacific Ocean that better closes the upper‐level anticyclone and confines the SWV within the enhanced transport barrier.