在CESM1（WACCM）模型中对亚洲夏季风区域平流层水汽的模拟
The Simulation of Stratospheric Water Vapor over the Asian Summer Monsoon Region in CESM1(WACCM) Models.
作者信息
Wang Xinyue, Wu Yutian, Tung Wen-Wen, Richter Jadwiga H, Glanville Anne A, Tilmes Simone, Orbe Clara, Huang Yi, Xia Yan, Kinnison Douglas E
机构信息
Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USA.
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA.
出版信息
J Geophys Res Atmos. 2018 Oct 27;123(20):11377-11391. doi: 10.1029/2018jd028971. Epub 2018 Oct 9.
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 Whole Atmosphere Community Climate Model (WACCM). 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 PV gradient over the central Pacific Ocean that better closes the upper-level anticyclone and confines the SWV within the enhanced transport barrier.
以往的观测研究发现，在亚洲夏季风区域上空的对流层上层和平流层下层（UTLS）中，平流层水汽（SWV）在高层反气旋的限制下持续出现最大值。本研究调查了全大气社区气候模型（WACCM）中SWV的模拟情况。WACCM通常倾向于模拟出太平洋中部上空的SWV最大值，但在高垂直分辨率版本中，这种偏差有了很大改善。与低垂直分辨率模型相比，在UTLS中增加垂直层数的高垂直分辨率模型在太平洋中部的UTLS分层较少。因此，它模拟出太平洋中部上空变陡的位涡梯度，能更好地封闭高层反气旋，并将SWV限制在增强的输送屏障内。
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