The Impact of Aerosol on Cloud Water: A Heuristic Perspective

IF 5.2 1区地球科学 Q1 ENVIRONMENTAL SCIENCES

Atmospheric Chemistry and Physics Pub Date : 2024-06-21 DOI:10.5194/egusphere-2024-1725

Fabian Hoffmann, Franziska Glassmeier, Graham Feingold

引用次数: 0

Abstract

Abstract. Aerosol-cloud interactions modulate the role of clouds in Earth's climate. We derive, evaluate, and apply a simple model to understand aerosol-mediated cloud water adjustments in stratocumulus based on only two prognostic equations for the integrated cloud water L and droplet number concentration N. The model is solved numerically and analytically, and agrees well with documented large-eddy simulation data and satellite retrievals. A tight relationship between adjustments at low and high N is found, revealing the influence of non-precipitation processes (primarily entrainment) on adjustments in precipitating clouds. Furthermore, it is shown that adjustments in non-precipitating clouds tend to be positively biased by external L or N perturbations, while adjustments in precipitating clouds are barely susceptible. By deliberately reducing the complexity of the underlying system, this study constitutes a way forward to facilitate process-level understanding of cloud water adjustments.

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气溶胶对云水的影响：启发式视角

摘要气溶胶与云的相互作用调节着云在地球气候中的作用。我们推导、评估并应用了一个简单的模型来理解气溶胶介导的层积云云水调整，该模型仅基于综合云水 L 和水滴数浓度 N 的两个预报方程。研究发现，低 N 值和高 N 值的调整之间关系密切，揭示了非沉降过程（主要是夹带）对降水云调整的影响。此外，研究还表明，非沉降云的调整往往会受到外部L或N扰动的正偏影响，而沉降云的调整则几乎不受影响。通过有意降低基本系统的复杂性，本研究为促进对云水调节过程的理解提供了一条前进的道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Chemistry and Physics 地学-气象与大气科学

CiteScore

10.70

自引率

20.60%

发文量

702

审稿时长

6 months

期刊介绍： Atmospheric Chemistry and Physics (ACP) is a not-for-profit international scientific journal dedicated to the publication and public discussion of high-quality studies investigating the Earth''s atmosphere and the underlying chemical and physical processes. It covers the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. The main subject areas comprise atmospheric modelling, field measurements, remote sensing, and laboratory studies of gases, aerosols, clouds and precipitation, isotopes, radiation, dynamics, biosphere interactions, and hydrosphere interactions. The journal scope is focused on studies with general implications for atmospheric science rather than investigations that are primarily of local or technical interest.