气候变化领域集成服务门户(CCPortal): Aerosol-induced modification of organised convection and top-of-atmosphere radiation

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DOI	10.1038/s41612-019-0089-1
	Aerosol-induced modification of organised convection and top-of-atmosphere radiation
	Nishant N.; Sherwood S.C.; Geoffroy O.
发表日期	2019
ISSN	23973722
卷号	2 期号:1
英文摘要	Aerosol effects on cloud cover and precipitation could affect the global climate but have proven difficult to verify, because cloud and rain amounts are so strongly influenced by local meteorological conditions. Here model and observational evidence is presented that an increase in CCN concentration slightly invigorates mixed-phase convective clouds and narrows tropical convergence and rain bands, while expanding associated cloud cover particularly at mid-levels. A suite of model simulations with various approaches indicates a 4 ± 3.8% decrease in the rain-to-cloud area ratio per doubling of the CCN concentration, an effect also detected in satellite observations. Idealised numerical experiments suggest the area ratio change is due to the invigoration-induced static stability increase. Although the invigoration and cloud amount changes are much smaller than suggested in some studies, in simulations the latter cool the planet by 0.71 ± 0.25 W/m2 in deep convective regions, suggesting a global effect of order 0.2–0.5 W/m2, per aerosol doubling. The contribution to present-day anthropogenic forcing is even harder to quantify but could compare to that of the direct aerosol radiative forcing. These results indicate a previously unrecognised pathway for aerosols to indirectly cool the climate by altering convective clouds dynamically. © 2019, The Author(s).
语种	英语
scopus关键词	aerosol; anthropogenic effect; atmospheric convection; cloud condensation nucleus; cloud cover; concentration (composition); precipitation (climatology); radiative forcing; solar radiation
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178072
作者单位	Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW, Australia; NSW Department of Planning, Industry and Environment, Sydney, NSW, Australia; National Centre for Meteorological Research, Toulouse, France
推荐引用方式 GB/T 7714	Nishant N.,Sherwood S.C.,Geoffroy O.. Aerosol-induced modification of organised convection and top-of-atmosphere radiation[J],2019,2(1).
APA	Nishant N.,Sherwood S.C.,&Geoffroy O..(2019).Aerosol-induced modification of organised convection and top-of-atmosphere radiation.npj Climate and Atmospheric Science,2(1).
MLA	Nishant N.,et al."Aerosol-induced modification of organised convection and top-of-atmosphere radiation".npj Climate and Atmospheric Science 2.1(2019).