A. Gettelman, T. Eidhammer, M. L. Duffy, D. T. McCoy, C. Song, D. Watson-Parris
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引用次数: 0
摘要
为了更好地理解气溶胶强迫和云反馈对模型过程变化的敏感性,使用了共同体大气模式第 6 版(CAM6)的扰动参数集合(PPE)。由于短波辐射,通过气溶胶-云相互作用产生的气溶胶强迫大多是负的(降温),而由于长波和短波效应的对比,不同地区的反馈是正的或负的。强迫和反馈都与平均气候状态有关。云辐射效应越大,通常意味着净负强迫和净正反馈越大。气溶胶作用力与云对降雨量的敏感性密切相关。反馈作用也与易感性有关,但程度较轻,而且在不同地区与气溶胶强迫有关。在 CAM6 PPE 中,气溶胶作用力和云的反馈作用是反相关的,因此较强的负作用力与较强的正反馈作用力相关。甚至在 PPE 中,影响强迫和反馈敏感性的过程也是相似的。这些过程包括暖雨形成过程、冰损失过程和深对流强度。
The Interaction Between Climate Forcing and Feedbacks
A Perturbed Parameter Ensemble (PPE) with the Community Atmosphere Model version 6 (CAM6) is used to better understand the sensitivity of aerosol forcing and cloud feedbacks to changes in model processes. Aerosol forcing through aerosol-cloud interactions is mostly negative (a cooling) due to shortwave radiation, while feedbacks are positive or negative in different regions due to contrasting longwave and shortwave effects. Both forcing and feedbacks are related to the mean climate state. Higher magnitude cloud radiative effects generally mean larger magnitude net negative forcing and larger magnitude net positive feedback. Aerosol forcing is broadly related to the susceptibility of clouds to drop number. Feedbacks also related to susceptibility, but to a lesser extent and in different regions to aerosol forcing. Aerosol forcing and cloud feedbacks are anti-correlated in the CAM6 PPE such that stronger negative forcing is associated with stronger positive feedbacks. Even the processes governing forcing and feedback sensitivity in the PPE are similar. These include the warm rain formation process, ice loss processes and deep convective intensity.
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.