How to think about the clear-sky shortwave water vapor feedback

IF 8.5 1区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Florian E. Roemer, Stefan A. Buehler, Kaah P. Menang
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Abstract

Earth’s climate feedback quantifies the response of Earth’s energy budget to temperature changes and thus determines climate sensitivity. The climate feedback is largely controlled by water vapor which absorbs both longwave radiation emitted by Earth and shortwave radiation from the Sun. For the clear-sky shortwave water vapor feedback λSW, a gap remains between process understanding and estimates from comprehensive climate models. Therefore, we present a hierarchy of simple models for λSW. We show that λSW is proportional to the change with temperature in the square of atmospheric transmissivity that depends on the atmospheric concentration of water vapor and its ability to absorb shortwave radiation. The global mean λSW is well captured by a simple analytical model that approximates the strong spectral variations in water vapor absorption, whereas its temperature dependence results from spectral details in water vapor absorption. With this study, we expand the conceptual understanding of an important but understudied feedback component.

Abstract Image

如何看待晴空短波水汽反馈
地球的气候反馈量化了地球能量收支对温度变化的响应,从而决定了气候敏感性。气候反馈在很大程度上是由水蒸气控制的,水蒸气吸收地球发出的长波辐射和太阳发出的短波辐射。对于晴空短波水汽反馈λSW,过程理解与综合气候模式估算之间仍有差距。因此,我们提出了λSW的简单模型层次结构。我们表明,λSW与大气透射率的平方成正比,而大气透射率取决于大气中水蒸气的浓度及其吸收短波辐射的能力。一个简单的解析模型可以很好地捕获全球平均λSW,该模型近似于水汽吸收的强烈光谱变化,而其温度依赖性则来自于水汽吸收的光谱细节。通过这项研究,我们扩展了对一个重要但研究不足的反馈组件的概念理解。
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来源期刊
npj Climate and Atmospheric Science
npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science
CiteScore
8.80
自引率
3.30%
发文量
87
审稿时长
21 weeks
期刊介绍: npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.
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