气候变化领域集成服务门户(CCPortal): Observationally constrained analysis of sea salt aerosol in the marine atmosphere

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DOI	10.5194/acp-19-10773-2019
	Observationally constrained analysis of sea salt aerosol in the marine atmosphere
	Bian H.; Froyd K.; Murphy D.M.; Dibb J.; Darmenov A.; Chin M.; Colarco P.R.; Da Silva A.; Kucsera T.L.; Schill G.; Yu H.; Bui P.; Dollner M.; Weinzierl B.; Smirnov A.
发表日期	2019
ISSN	16807316
起始页码	10773
结束页码	10785
卷号	19 期号:16
英文摘要	Atmospheric sea salt plays important roles in marine cloud formation and atmospheric chemistry. We performed an integrated analysis of NASA GEOS model simulations run with the GOCART aerosol module, in situ measurements from the PALMS and SAGA instruments obtained during the NASA ATom campaign, and aerosol optical depth (AOD) measurements from the AERONET Marine Aerosol Network (MAN) and from MODIS satellite observations to better constrain sea salt in the marine atmosphere. ATom measurements and GEOS model simulations both show that sea salt concentrations over the Pacific and Atlantic oceans have a strong vertical gradient, varying up to 4 orders of magnitude from the marine boundary layer to free troposphere. The modeled residence times suggest that the lifetime of sea salt particles with a dry diameter of less than 3 μm is largely controlled by wet removal, followed by turbulent process. During both boreal summer and winter, the GEOS-simulated sea salt mass mixing ratios agree with SAGA measurements in the marine boundary layer (MBL) and with PALMS measurements above the MBL. However, comparison of AOD from GEOS with AERONET/MAN and MODIS aerosol retrievals indicated that the model underestimated AOD over the oceans where sea salt dominates. The apparent discrepancy of slightly overpredicted concentration and large underpredicted AOD could not be explained by biases in the model RH affecting the particle hygroscopic growth, as modeled RH was found to be comparable to or larger than the in situ measurements. This conundrum could at least partially be explained by the difference in sea salt size distribution; the GEOS simulation has much less sea salt percentage-wise in the smaller particle size range and thus less efficient light extinction than what was observed by PALMS. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; concentration (composition); EOS; in situ measurement; marine atmosphere; optical depth; particle size; sea salt; vertical profile; Atlantic Ocean; Pacific Ocean
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/144197
作者单位	University of Maryland at Baltimore County, Baltimore County, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; University of New Hampshire, Durham, NH, United States; Universities Space Research Association, Columbia, MD, United States; NASA Ames Research Center, Moffett Field, CA, United States; University of Vienna, Faculty of Physics, Aerosol and Environmental Physics, Boltzmanngasse 5, Vienna, 1090, Austria; Science Systems and Applications Inc, Lanham, MD, United States
推荐引用方式 GB/T 7714	Bian H.,Froyd K.,Murphy D.M.,et al. Observationally constrained analysis of sea salt aerosol in the marine atmosphere[J],2019,19(16).
APA	Bian H..,Froyd K..,Murphy D.M..,Dibb J..,Darmenov A..,...&Smirnov A..(2019).Observationally constrained analysis of sea salt aerosol in the marine atmosphere.Atmospheric Chemistry and Physics,19(16).
MLA	Bian H.,et al."Observationally constrained analysis of sea salt aerosol in the marine atmosphere".Atmospheric Chemistry and Physics 19.16(2019).