The Rapid Transition From Shallow to Precipitating Convection as a Predator–Prey Process

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Cristian V. Vraciu, Julien Savre, Maxime Colin
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引用次数: 0

Abstract

Properly predicting the rapid transition from shallow to precipitating atmospheric convection within a diurnal cycle over land is of great importance for both weather prediction and climate projections. In this work, we consider that a cumulus cloud is formed due to the transport of water mass by multiple updrafts during its lifetime. Cumulus clouds then locally create favorable conditions for the subsequent convective updrafts to reach higher altitudes, leading to deeper precipitating convection. This mechanism is amplified by the cold pools formed by the evaporation of precipitation in the sub-cloud layer. Based on this conceptual view of cloud–cloud interactions which goes beyond the one cloud equals one–plume picture, it is argued that precipitating clouds may act as predators that prey on the total cloud population, such that the rapid shallow–to–deep transition can be modeled as a simple predator–prey system. This conceptual model is validated by comparing solutions of the Lotka-Volterra system of equations to results obtained using a high-resolution large-eddy simulation model. Moreover, we argue that the complete diurnal cycle of deep convection can be seen as a predator–prey system with varying food supply for the prey. Finally, we suggest that based on the present conceptual model, new unified cloud-convection parameterizations can be designed which may lead to improved representations of the transition from shallow to precipitating continental convection.

Abstract Image

从浅对流到沉淀对流的快速转变是一个捕食者-猎物过程
正确预测陆地上大气对流在日循环中由浅向降水的快速转变,对于天气预报和气候预估都具有重要意义。在这项工作中,我们认为积云是由于在其生命周期中多次上升气流输送水团而形成的。然后,积云在局部为随后的对流上升气流到达更高的高度创造有利条件,导致更深的降水对流。这种机制被下层降水蒸发形成的冷池放大。基于这种云-云相互作用的概念性观点,它超越了一朵云等于一朵羽的图景,有人认为,降水云可能扮演捕食者的角色,捕食整个云群,这样,从浅到深的快速过渡可以被建模为一个简单的捕食者-猎物系统。通过将Lotka-Volterra方程组的解与高分辨率大涡模拟模型的结果进行比较,验证了该概念模型。此外,我们认为深层对流的完整日循环可以被视为一个捕食者-猎物系统,猎物的食物供应变化。最后,我们建议基于目前的概念模式,可以设计新的统一的云对流参数化,从而改进从浅向降水大陆对流转变的表征。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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