Aerosol-cloud-climate cooling overestimated by ship-track data

doi:10.1126/science.abd3980

GSTDTAP > 气候变化

DOI	10.1126/science.abd3980
	Aerosol-cloud-climate cooling overestimated by ship-track data
	Franziska Glassmeier; Fabian Hoffmann; Jill S. Johnson; Takanobu Yamaguchi; Ken S. Carslaw; Graham Feingold
	2021-01-29
发表期刊	Science
出版年	2021
英文摘要	The magnitude of the effect of anthropogenic aerosols on the formation of clouds is an important unknown about how humans are affecting climate. Studies of stratocumulus cloud tracks that are formed by ship exhaust have been used to estimate the radiative impact of this process, but Glassmeier et al. now show that this approach overestimates the cooling effect of aerosol addition by up to 200%. These findings underscore the need to quantify stratocumulus cloud responses to anthropogenic aerosols to understand the climate system. Science , this issue p. [485][1] The effect of anthropogenic aerosol on the reflectivity of stratocumulus cloud decks through changes in cloud amount is a major uncertainty in climate projections. In frequently occurring nonprecipitating stratocumulus, cloud amount can decrease through aerosol-enhanced cloud-top mixing. The climatological relevance of this effect is debated because ship exhaust only marginally reduces stratocumulus amount. By comparing detailed numerical simulations with satellite analyses, we show that ship-track studies cannot be generalized to estimate the climatological forcing of anthropogenic aerosol. The ship track–derived sensitivity of the radiative effect of nonprecipitating stratocumulus to aerosol overestimates their cooling effect by up to 200%. The offsetting warming effect of decreasing stratocumulus amount needs to be taken into account if we are to constrain the cloud-mediated radiative forcing of anthropogenic aerosol. [1]: /lookup/doi/10.1126/science.abd3980
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314011
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Franziska Glassmeier,Fabian Hoffmann,Jill S. Johnson,et al. Aerosol-cloud-climate cooling overestimated by ship-track data[J]. Science,2021.
APA	Franziska Glassmeier,Fabian Hoffmann,Jill S. Johnson,Takanobu Yamaguchi,Ken S. Carslaw,&Graham Feingold.(2021).Aerosol-cloud-climate cooling overestimated by ship-track data.Science.
MLA	Franziska Glassmeier,et al."Aerosol-cloud-climate cooling overestimated by ship-track data".Science (2021).