气候变化领域集成服务门户(CCPortal): Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation

CCPortal

DOI	10.1029/2018MS001523
	Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation
	Beydoun H.; Hoose C.
发表日期	2019
ISSN	19422466
起始页码	1066
结束页码	1087
卷号	11 期号:4
英文摘要	We investigate the sensitivity of self-aggregated radiative-convective-equilibrium cloud-resolving model simulations to the cloud condensation nuclei (CCN) concentration. Experiments were conducted on a long (2,000-km × 120-km) channel domain, allowing the emergence of multiple convective clusters and dry regions of subsidence. Increasing the CCN concentration leads to increased moisture in the dry regions, increased midlevel and upper level clouds, decreased radiative cooling, and decreased precipitation. We find that these trends follow from a decrease in the strength of the self-aggregation as measured by the moist static energy (MSE) variance. In our simulations, precipitation is correlated, both locally and in total, with the distribution of MSE anomalies. We thus quantify changes in the adiabatic/diabatic contributions to MSE anomalies (Wing & Emanuel, 2014, https://doi.org/10.1002/2013MS000269) and relate those changes to changes in precipitation. Through a simple two-column conceptual model, we argue that the reduction in precipitation can be explained thermodynamically by the reduction in mean net radiative cooling and mechanistically by the weakening of the area-weighted radiatively driven subsidence velocity—defined as the ratio of the total radiative cooling over the dry regions and the static stability. We interpret the system's response to increasing CCN as a thermodynamically constrained realization of an aerosol indirect effect on clouds and precipitation. ©2019. The Authors.
语种	英语
scopus关键词	Aerosols; Radiative Cooling; Subsidence; Aerosol indirect effect; Cloud condensation nuclei; Cloud-resolving model simulations; Moist static energy; Radiative-convective equilibrium; Self aggregation; Static stability; Subsidence velocity; Precipitation (meteorology); atmospheric convection; cloud condensation nucleus; concentration (composition); cooling; precipitation (climatology); thermodynamics
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156926
作者单位	Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
推荐引用方式 GB/T 7714	Beydoun H.,Hoose C.. Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation[J],2019,11(4).
APA	Beydoun H.,&Hoose C..(2019).Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation.Journal of Advances in Modeling Earth Systems,11(4).
MLA	Beydoun H.,et al."Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation".Journal of Advances in Modeling Earth Systems 11.4(2019).