GSTDTAP  > 地球科学
DOI10.5194/acp-19-6295-2019
Cloud droplet growth in shallow cumulus clouds considering 1-D and 3-D thermal radiative effects
Klinger, Carolin1,2; Feingold, Graham1; Yamaguchi, Takanobu1,3
2019-05-14
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2019
卷号19期号:9页码:6295-6313
文章类型Article
语种英语
国家USA; Germany
英文摘要

The effect of 1-D and 3-D thermal radiation on cloud droplet growth in shallow cumulus clouds is investigated using large eddy simulations with size-resolved cloud microphysics. A two-step approach is used for separating microphysical effects from dynamical feedbacks. In step one, an offline parcel model is used to describe the onset of rain. The growth of cloud droplets to raindrops is simulated with bin-resolved microphysics along previously recorded Lagrangian trajectories. It is shown that thermal heating and cooling rates can enhance droplet growth and raindrop production. Droplets grow to larger size bins in the 10-30 mu m radius range. The main effect in terms of raindrop production arises from recirculating parcels, where a small number of droplets are exposed to strong thermal cooling at cloud edge. These recirculating parcels, comprising about 6%-7% of all parcels investigated, make up 45% of the rain for the no-radiation simulation and up to 60% when 3-D radiative effects are considered. The effect of 3-D thermal radiation on rain production is stronger than that of 1-D thermal radiation. Three-dimensional thermal radiation can enhance the rain amount up to 40% compared to standard droplet growth without radiative effects in this idealized framework.


In the second stage, fully coupled large eddy simulations show that dynamical effects are stronger than microphysical effects, as far as the production of rain is concerned. Three-dimensional thermal radiative effects again exceed one-dimensional thermal radiative effects. Small amounts of rain are produced in more clouds (over a larger area of the domain) when thermal radiation is applied to microphysics. The dynamical feedback is shown to be an enhanced cloud circulation with stronger subsiding shells at the cloud edges due to thermal cooling and stronger updraft velocities in the cloud center. It is shown that an evaporation-circulation feedback reduces the amount of rain produced in simulations where 3-D thermal radiation is applied to microphysics and dynamics, in comparison to where 3-D thermal radiation is only applied to dynamics.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000467813100002
WOS关键词MICROPHYSICAL STRUCTURE ; CONDENSATION NUCLEI ; SIZE DISTRIBUTIONS ; COLLECTION BREAKUP ; RAINDROP SPECTRA ; STRATOCUMULUS ; MODEL ; TURBULENT ; EVOLUTION ; CLIMATE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/183185
专题地球科学
作者单位1.NOAA, Chem Sci Div, ESRL, Boulder, CO 80305 USA;
2.Ludwig Maximilians Univ Munchen, Lehrstuhl Expt Meteorol, Munich, Germany;
3.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
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GB/T 7714
Klinger, Carolin,Feingold, Graham,Yamaguchi, Takanobu. Cloud droplet growth in shallow cumulus clouds considering 1-D and 3-D thermal radiative effects[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(9):6295-6313.
APA Klinger, Carolin,Feingold, Graham,&Yamaguchi, Takanobu.(2019).Cloud droplet growth in shallow cumulus clouds considering 1-D and 3-D thermal radiative effects.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(9),6295-6313.
MLA Klinger, Carolin,et al."Cloud droplet growth in shallow cumulus clouds considering 1-D and 3-D thermal radiative effects".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.9(2019):6295-6313.
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