气候变化领域集成服务门户(CCPortal): Ice-nucleating particles near two major dust source regions

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DOI	10.5194/acp-22-12607-2022
	Ice-nucleating particles near two major dust source regions
	Beall, Charlotte M.; Hill, Thomas C. J.; DeMott, Paul J.; Koneman, Tobias; Pikridas, Michael; Drewnick, Frank; Harder, Hartwig; Pohlker, Christopher; Lelieveld, Jos; Weber, Bettina; Iakovides, Minas; Prokes, Roman; Sciare, Jean; Andreae, Meinrat O.; Stokes, M. Dale; Prather, Kimberly A.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12607
结束页码	12627
卷号	22 期号:18 页码:21
英文摘要	Mineral dust and sea spray aerosol represent important sources of ice-nucleating particles (INPs), the minor fraction of aerosol particles able to trigger cloud ice crystal formation and, consequently, influence multiple climate-relevant cloud properties including lifetime, radiative properties and precipitation initiation efficiency. Mineral dust is considered the dominant INP source in many parts of the world due to its ice nucleation efficiency and its sheer abundance, with global emission rates of up to 4700 Tg a(-1). However, INPs emitted from the ocean surface in sea spray aerosol frequently dominate INP populations in remote marine environments, including parts of the Southern Ocean where cloud-resolving model simulations have demonstrated that cloud radiative properties are likely strongly controlled by INPs. Here we report INP concentrations measured in aerosol and seawater samples during Air Quality and Climate Change in the Arabian Basin (AQABA), a shipborne campaign that spanned the Red Sea, Gulf of Aden, Arabian Sea, Arabian Gulf and part of the Mediterranean. In aerosol samples collected within a few hundred kilometers of the first and second ranked sources of dust globally, the Sahara and Arabian Peninsula, INP concentrations ranged from 0.2 to 11 L-1 at -20 degrees C with observed ice-active surface site densities (n(s)) 1-3 orders of magnitude below levels predicted by mineral dust INP parameterizations. Over half of the samples (at least 14 of 26) were collected during dust storms with average dust mass concentrations between 150 and 490 mu g m(-3) (PM10), as simulated by the Modern-Era Retrospective analysis for Research and Application, version 2 (MERRA-2). The impacts of heat and peroxide treatments indicate that organics dominated the observed ice nucleation (IN) activity at temperatures >= -15 degrees C with proteinaceous (heat-labile) INPs frequently observed at high freezing temperatures > - 10 degrees C. INP concentrations in seawater samples ranged between 3 and 46 mL(-1) at -19 degrees C, demonstrating the relatively low INP source potential of seawater in the region as compared to seawater from multiple other regions reported previously. Overall, our results demonstrate that despite proximity to the Sahara and the Arabian Peninsula and the dominance of mineral dust in the aerosol sampled, existing mineral dust parameterizations alone would not skillfully represent the near-surface n(s) in the observed temperature regime (-6 to -25 degrees C). Future efforts to develop or improve representations of dust INPs at modest supercooling (>= -15 degrees C) would benefit from a characterization of the specific organic species associated with dust INPs. More generally, an improved understanding of the organic species associated with increased IN activity and their variability across dust source regions would directly inform efforts to determine whether n(s)-based parameterizations are appropriate for faithful representation of dust INPs in this sensitive temperature regime, whether region-specific parameterizations are required, or whether an alternative to the n(s) approach is necessary.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000860521300001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273672
作者单位	University of California System; University of California San Diego; Scripps Institution of Oceanography; Max Planck Society; Max Planck Society; Colorado State University; Max Planck Society; Max Planck Society; Masaryk University Brno; Czech Academy of Sciences; Global Change Research Centre of the Czech Academy of Sciences; King Saud University; University of California System; University of California San Diego; University of Graz
推荐引用方式 GB/T 7714	Beall, Charlotte M.,Hill, Thomas C. J.,DeMott, Paul J.,et al. Ice-nucleating particles near two major dust source regions[J],2022,22(18):21.
APA	Beall, Charlotte M..,Hill, Thomas C. J..,DeMott, Paul J..,Koneman, Tobias.,Pikridas, Michael.,...&Prather, Kimberly A..(2022).Ice-nucleating particles near two major dust source regions.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),21.
MLA	Beall, Charlotte M.,et al."Ice-nucleating particles near two major dust source regions".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):21.