气候变化领域集成服务门户(CCPortal): Global Radiative Impacts of Mineral Dust Perturbations Through Stratiform Clouds

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DOI	10.1029/2019JD031807
	Global Radiative Impacts of Mineral Dust Perturbations Through Stratiform Clouds
	McGraw Z.; Storelvmo T.; David R.O.; Sagoo N.
发表日期	2020
ISSN	2169897X
卷号	125 期号:23
英文摘要	Airborne mineral dust influences cloud occurrence and optical properties, which may provide a pathway for recent and future changes in dust concentration to alter the temperature at Earth's surface. However, despite prior suggestions that dust-cloud interactions are an important control on the Earth's radiation balance, we find global mean cloud radiative effects to be insensitive to widespread dust changes. Here we simulate uniformly applied shifts in dust amount in a present-day atmosphere using a version of the CAM5 atmosphere model (within CESM v1.2.2) modified to incorporate laboratory-based ice nucleation parameterizations in stratiform clouds. Increasing and decreasing dustiness from current levels to paleoclimate extremes caused effective radiative forcings through clouds of +0.02 ± 0.01 and −0.05 ± 0.02 W/m2, respectively, with ranges of −0.26 to +0.13 W/m2 and −0.21 to +0.39 W/m2 from sensitivity tests. Our simulations suggest that these forcings are limited by several factors. Longwave and shortwave impacts largely cancel, particularly in mixed-phase clouds, while in warm and cirrus clouds opposite responses between regions further reduce each global forcing. Additionally, changes in dustiness cause opposite forcings through aerosol indirect effects in mixed-phase clouds as in cirrus, while in warm clouds indirect effects are weak at nearly all locations. Nevertheless, regional forcings and global impacts on longwave and shortwave radiation were found to be nonnegligible, suggesting that cloud-mediated dust effects have significance in simulations of present and future climate. © 2020. The Authors.
英文关键词	aerosol indirect effects; cirrus clouds; climate modeling; ice nucleation; mineral dust; mixed-phase clouds
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185600
作者单位	Department of Geosciences, University of Oslo, Oslo, Norway; Department of Meteorology, Stockholm University, Stockholm, Sweden
推荐引用方式 GB/T 7714	McGraw Z.,Storelvmo T.,David R.O.,et al. Global Radiative Impacts of Mineral Dust Perturbations Through Stratiform Clouds[J],2020,125(23).
APA	McGraw Z.,Storelvmo T.,David R.O.,&Sagoo N..(2020).Global Radiative Impacts of Mineral Dust Perturbations Through Stratiform Clouds.Journal of Geophysical Research: Atmospheres,125(23).
MLA	McGraw Z.,et al."Global Radiative Impacts of Mineral Dust Perturbations Through Stratiform Clouds".Journal of Geophysical Research: Atmospheres 125.23(2020).