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Aerosol effects on clouds are concealed by natural cloud heterogeneity and satellite retrieval errors
Nature Communications ( IF 16.6 ) Pub Date : 2022-11-30 , DOI: 10.1038/s41467-022-34948-5
Antti Arola 1 , Antti Lipponen 1 , Pekka Kolmonen 1 , Timo H Virtanen 1 , Nicolas Bellouin 2 , Daniel P Grosvenor 3 , Edward Gryspeerdt 4 , Johannes Quaas 5 , Harri Kokkola 1
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One major source of uncertainty in the cloud-mediated aerosol forcing arises from the magnitude of the cloud liquid water path (LWP) adjustment to aerosol-cloud interactions, which is poorly constrained by observations. Many of the recent satellite-based studies have observed a decreasing LWP as a function of cloud droplet number concentration (CDNC) as the dominating behavior. Estimating the LWP response to the CDNC changes is a complex task since various confounding factors need to be isolated. However, an important aspect has not been sufficiently considered: the propagation of natural spatial variability and errors in satellite retrievals of cloud optical depth and cloud effective radius to estimates of CDNC and LWP. Here we use satellite and simulated measurements to demonstrate that, because of this propagation, even a positive LWP adjustment is likely to be misinterpreted as negative. This biasing effect therefore leads to an underestimate of the aerosol-cloud-climate cooling and must be properly considered in future studies.



中文翻译:

气溶胶对云的影响被自然云的异质性和卫星检索误差所掩盖

云介导的气溶胶强迫的不确定性的一个主要来源是云液态水路径 (LWP) 对气溶胶-云相互作用的调整幅度,这很少受到观测的限制。最近的许多基于卫星的研究已经观察到 LWP 的降低是云滴数浓度 (CDNC) 的函数,作为主导行为。估计 LWP 对 CDNC 变化的响应是一项复杂的任务,因为需要隔离各种混杂因素。然而,一个重要方面尚未得到充分考虑:云光学深度和云有效半径的卫星反演中的自然空间变异性和误差对 CDNC 和 LWP 估计的传播。在这里,我们使用卫星和模拟测量来证明,由于这种传播,即使是积极的 LWP 调整也可能被误解为消极的。因此,这种偏差效应导致对气溶胶-云-气候冷却的低估,必须在未来的研究中适当考虑。

更新日期:2022-11-30
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