Revisiting Southern Hemisphere polar stratospheric temperature trends in WACCM: The role of dynamical forcing

被引：17

作者：

Calvo, N. ^{[1
,2
]}

Garcia, R. R. ^{[2
]}

Kinnison, D. E. ^{[2
]}

机构：

[1] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra 2, Madrid, Spain

[2] Natl Ctr Atmospher Res, Atmospher Chem Observat & Modeling Lab, POB 3000, Boulder, CO 80307 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 07期

基金：

美国国家科学基金会;

关键词：

temperature trends; Brewer-Dobson circulation; chemistry-climate model; WACCM; CLIMATE-CHANGE; 20TH-CENTURY; ATMOSPHERE; OZONE; MODEL;

D O I：

10.1002/2017GL072792

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The latest version of the Whole Atmosphere Community Climate Model (WACCM), which includes a new chemistry scheme and an updated parameterization of orographic gravity waves, produces temperature trends in the Antarctic lower stratosphere in excellent agreement with radiosonde observations for 1969-1998 as regards magnitude, location, timing, and persistence. The maximum trend, reached in November at 100hPa, is -4.42.8Kdecade(-1), which is a third smaller than the largest trend in the previous version of WACCM. Comparison with a simulation without the updated orographic gravity wave parameterization, together with analysis of the model's thermodynamic budget, reveals that the reduced trend is due to the effects of a stronger Brewer-Dobson circulation in the new simulations, which warms the polar cap. The effects are both direct (a trend in adiabatic warming in late spring) and indirect (a smaller trend in ozone, hence a smaller reduction in shortwave heating, due to the warmer environment).

引用

页码：3402 / 3410

页数：9

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