气候变化领域集成服务门户(CCPortal): Saharan dust aerosols change deep convective cloud prevalence, possibly by Inhibiting Marine New Particle formation

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DOI	10.1175/JCLI-D-20-0083.1
	Saharan dust aerosols change deep convective cloud prevalence, possibly by Inhibiting Marine New Particle formation
	Zamora L.M.; Kahn R.A.
发表日期	2020
ISSN	08948755
起始页码	9467
结束页码	9480
卷号	33 期号:21
英文摘要	Deep convective clouds (DCCs) are important to global climate, atmospheric chemistry, and precipitation. Dust, a dominant aerosol type over the tropical North Atlantic, has potentially large microphysical impacts on DCCs over this region. However, dust effects are difficult to identify, being confounded by covarying meteorology and other factors. Here, a method is developed to quantify DCC responses to dust and other aerosols at large spatial and temporal scales despite these uncertainties. Over 7 million tropical North Atlantic cloud, aerosol, and meteorological profiles from CloudSat satellite data and MERRA-2 reanalysis products are used to stratify cloud observations into meteorological regimes, objectively select a priori assumptions, and iteratively test uncertainty sensitivity. Dust is robustly associated with a 54% increase in DCC prevalence. However, marine aerosol proxy concentrations are 5 times more predictive of dustassociated increases in DCC prevalence than the dust itself, or any other aerosol or meteorological factor. Marine aerosols are also the most predictive factor for the even larger increases in DCC prevalence (61%-87%) associated with enhanced dimethyl sulfide and combustion and sulfate aerosols. Dust-associated increases in DCC prevalence are smaller at high dust concentrations than at low concentrations. These observations suggest that not only is dust a comparatively ineffective CCN source, but it may also act as a condensation/coagulation sink for chemical precursors to CCN, reducing total CCN availability over large spatial scales by inhibiting new particle formation from marine emissions. These observations represent the first time this process, previously predicted by models, has been supported and quantified by measurements. © 2020 American Meteorological Society.
英文关键词	Aerosol-cloud interaction; Atmospheric composition; Cloud microphysics; Deep convection; North atlantic ocean; Remote sensing
语种	英语
scopus关键词	Aerosols; Atmospheric chemistry; Atmospheric thermodynamics; Clouds; Iterative methods; Precipitation (meteorology); Sulfur compounds; Tropics; Chemical precursors; Cloud observations; Deep convective clouds; Dust concentrations; Low concentrations; Meteorological factors; New particle formation; Spatial and temporal scale; Dust; aerosol; cloud microphysics; CloudSat; concentration (composition); convective cloud; dust; marine atmosphere; remote sensing; spatiotemporal analysis; Atlantic Ocean; Atlantic Ocean (North); Sahara
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178717
作者单位	Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Zamora L.M.,Kahn R.A.. Saharan dust aerosols change deep convective cloud prevalence, possibly by Inhibiting Marine New Particle formation[J],2020,33(21).
APA	Zamora L.M.,&Kahn R.A..(2020).Saharan dust aerosols change deep convective cloud prevalence, possibly by Inhibiting Marine New Particle formation.Journal of Climate,33(21).
MLA	Zamora L.M.,et al."Saharan dust aerosols change deep convective cloud prevalence, possibly by Inhibiting Marine New Particle formation".Journal of Climate 33.21(2020).