Muted Radiative Feedback of Stratospheric Water Vapor Found in a Multimodel Assessment

IF 3.8 2区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-17 DOI:10.1029/2025JD043676

Ruogu He, Yi Huang

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Abstract

The strength of stratospheric water vapor (SWV) radiative feedback has been debated, primarily due to the compensating radiative effects of the associated stratospheric and tropospheric temperature adjustments, which are primarily triggered by radiation process. In this study, we calculate the SWV radiative feedback in the CMIP6 model ensemble in a quadrupling CO₂ experiment. Specifically, we compare the results of two quantifications: one accounting for the radiatively driven temperature adjustment in the stratosphere only and the other in the entire atmospheric column including both the stratosphere and the troposphere. The stratosphere-adjusted feedback is found to be $0.25 \pm 0.06 W m^{- 2} K^{- 1}$ , but it reduces to $0.020 \pm 0.007 W m^{- 2} K^{- 1}$ with the full atmosphere adjustment, indicating the radiation process alone may lead to a muted overall SWV radiative effect, due to the stratospheric cooling and tropospheric warming simultaneously driven by the SWV radiative perturbation. This suggests that the radiative forcing of SWV is subject to an intrinsic and robust limiting effect. In addition, we analyze the intermodel spreads in the temperature adjustment and its radiative effect, and find the spreads primarily arise from the differences in SWV responses projected by GCMs, rather than the differences in their climatological states.

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在多模式评估中发现的平流层水汽的弱辐射反馈

平流层水汽（SWV）辐射反馈的强度一直存在争议，主要是由于相关的平流层和对流层温度调整的补偿辐射效应，而平流层和对流层温度调整主要由辐射过程触发。在本研究中，我们计算了四倍CO2实验中CMIP6模式集合的SWV辐射反馈。具体来说，我们比较了两种量化结果：一种只考虑平流层辐射驱动的温度调整，另一种考虑整个大气柱（包括平流层和对流层）的辐射驱动温度调整。平流层调整反馈为0.25±0.06 W m−2 K−1$0.25\mathit{\pm}0.06\ mathm {W}{\ mathm {m}}^{-2}{\ mathm {K}}^{-1}$但减小到0.020±0.007 W m−2 K−1$0.020\mathit{\pm}0.007\ mathm {W}{\ mathm {m}}^{-2}{\ mathm {K}}^{-1}$表明，由于SWV辐射扰动同时驱动平流层变冷和对流层变暖，辐射过程本身可能导致整体SWV辐射效应减弱。这表明SWV的辐射强迫受到一个内在的和强大的限制效应。此外，我们还分析了模式间在温度调整及其辐射效应中的差异，发现这种差异主要是由gcm预估SWV响应的差异引起的，而不是由其气候状态的差异引起的。

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来源期刊

Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics

CiteScore

7.30

自引率

11.40%

发文量

684

期刊介绍： JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.