Aerosol Microphysical and Radiative Effects on Continental Cloud Ensembles

本文刊于: 《Advances in Atmospheric Sciences》 2018年第02期

关键词:
aerosol-cloud-radiation interactions;clo

Keywords
aerosol-cloud-radiation interactions;cloud-resolving model;cloud microphysics and macrophysics;precipitation
下载地址:    点击下载
Aerosol Microphysical and Radiative Effects on Continental Cloud Ensembles
摘要
     Aerosol–cloud–radiation interactions represent one of the largest uncertainties in the current climate assessment. Much of the complexity arises from the non-monotonic responses of clouds, precipitation and radiative fluxes to aerosol perturbations under various meteorological conditions. In this study, an aerosol-aware WRF model is used to investigate the microphysical and radiative effects of aerosols in three weather systems during the March 2000 Cloud Intensive Observational Period campaign at the US Southern Great Plains. Three simulated cloud ensembles include a low-pressure deep convective cloud system, a collection of less-precipitating stratus and shallow cumulus, and a cold frontal passage. The WRF simulations are evaluated by several ground-based measurements. The microphysical properties of cloud hydrometeors, such as their mass and number concentrations, generally show monotonic trends as a function of cloud condensation nuclei concentrations.Aerosol radiative effects do not influence the trends of cloud microphysics, except for the stratus and shallow cumulus cases where aerosol semi-direct effects are identified. The precipitation changes by aerosols vary with the cloud types and their evolving stages, with a prominent aerosol invigoration effect and associated enhanced precipitation from the convective sources. The simulated aerosol direct effect suppresses precipitation in all three cases but does not overturn the aerosol indirect effect. Cloud fraction exhibits much smaller sensitivity(typically less than 2%) to aerosol perturbations, and the responses vary with aerosol concentrations and cloud regimes. The surface shortwave radiation shows a monotonic decrease by increasing aerosols, while the magnitude of the decrease depends on the cloud type.


本文地址:www.fabiao.net/content-36-66377-1.html

上一篇:Aerosol Properties and Their Impacts on Surface CCN at the ARM Southern Great Pl
下一篇:最后一页

分享到: 分享Aerosol Microphysical and Radiative Effects on Continental Cloud Ensembles到腾讯微博           收藏
评论排行
公告 
相关期刊文献推荐