The Key Role of Coupled Chemistry–Climate Interactions in Tropical Stratospheric Temperature Variability

The Key Role of Coupled Chemistry–Climate Interactions in Tropical Stratospheric Temperature Variability
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耦合化学与气候相互作用在热带平流层温度变化中的关键作用

DOI:
10.1175/jcli-d-20-0071.1
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发表时间:
2020
期刊:
影响因子:
4.9
通讯作者:
Kim, Seo-Yeon
Kim, Seo-Yeon
中科院分区:
地球科学2区
文献类型:
--
作者:
Yook, Simchan;Thompson, David W.;Solomon, Susan;Kim, Seo-Yeon

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本研究的目的是量化化学与气候耦合相互作用对平流层温度变化幅度和结构的影响。为此,作者检查了在全大气耦合气候模型 (WACCM) 第 4 版上运行的两个模拟:一个“自由运行”模拟,其中包括完全耦合的化学-气候相互作用,以及强制使用规定的气候平均化学成分的模型的“指定化学”版本。结果表明,耦合化学与气候的相互作用使热带平流层下部温度的内部变化增加了约 2 倍,南半球极地平流层的温度内部变化程度较小。热带平流层下部温度变化的增加与动态驱动的臭氧-温度反馈相关,该反馈仅包含在耦合化学模拟中。结果强调了大气环流和化学之间的双向反馈在驱动平流层低层气候变化中的基本作用。
The purpose of this study is to quantify the effects of coupled chemistry–climate interactions on the amplitude and structure of stratospheric temperature variability. To do so, the authors examine two simulations run on version 4 of the Whole Atmosphere Coupled Climate Model (WACCM): a “free-running” simulation that includes fully coupled chemistry–climate interactions and a “specified chemistry” version of the model forced with prescribed climatological-mean chemical composition. The results indicate that the inclusion of coupled chemistry–climate interactions increases the internal variability of temperature by a factor of ~2 in the lower tropical stratosphere and—to a lesser extent—in the Southern Hemisphere polar stratosphere. The increased temperature variability in the lower tropical stratosphere is associated with dynamically driven ozone–temperature feedbacks that are only included in the coupled chemistry simulation. The results highlight the fundamental role of two-way feedbacks between the atmospheric circulation and chemistry in driving climate variability in the lower stratosphere.
DOI: 10.1029/2019gl084679
发表时间: 2019-12-12
影响因子: 5.2
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