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DOI	10.1016/j.atmosenv.2020.117533
	Aerosol absorption over the Aegean Sea under northern summer winds
	Methymaki G.; Bossioli E.; Kalogiros J.; Kouvarakis G.; Mihalopoulos N.; Nenes A.; Tombrou M.
发表日期	2020
ISSN	1352-2310
卷号	231
英文摘要	In this modelling study, the absorption influence on radiation, apart from scattering, is studied above the Aegean Sea (Eastern Mediterranean) under a typical warm 13-day period with northern winds, transporting polluted air masses. The simulated (WRF-Chem) forcing caused by the total absorption is estimated along with black carbon (BC), dust, and sea salt contributions, 1.3, 1.2, 0.1 and nearly zero W m−2, accordingly. As dust and sea salt influence is negligible, the main focus is on BC. BC absorption reduces downward shortwave irradiance reaching the ground by up to 5.2 W m−2 and the upward part by up to 1.7 W m−2. The downward and the upward longwave irradiances are augmented by up to 2.3 and 1.2 W m−2, accordingly. Even though the cloud formation is not favoured during the study period, BC absorption reduces overall the cloud water mixing ratio by 10% (semi-direct effect). However, during specific days and over limited cloudy areas, the semi-direct effect reduces low level clouds up to 20% while in case of higher clouds the reduction reaches up to ~29%. In order to examine the physical mechanisms below semi-direct effect, all modelled heating rates are analysed. Radiation direct absorption increases the air temperature with a rate up to 0.2 K day−1, with an exception inside the surface layer, where unexpectedly longwave cooling prevails. The heating of the surface layer is mainly attributed to the advection process, as more heated air masses are transported over the Aegean Sea. © 2020 Elsevier Ltd
英文关键词	Aerosol absorption; Aerosol-radiation interaction; Black carbon absorption; Direct effect; heating rate; Mediterranean; Semi-direct effect; WRF-Chem
语种	英语
scopus关键词	Dust; Water absorption; Advection process; Aerosol absorption; Direct absorption; Eastern Mediterranean; Low-level clouds; Modelling studies; Physical mechanism; Polluted air mass; Absorption cooling; water; absorption; aerosol; air mass; air temperature; black carbon; cloud water; concentration (composition); cooling; heating; modeling; summer; temperature effect; absorption; Aegean Sea; aerosol; air temperature; Article; cloud; dust; environmental radioactivity; heating; meteorology; physical phenomena; priority journal; simulation; summer; surface property; wind; Aegean Sea; Mediterranean Sea
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129487
作者单位	Department of Physics, National and Kapodistrian University of Athens, Athens, 15772, Greece; Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, 15236, Greece; Department of Chemistry, University of Crete, Heraklion, 700 13, Greece; Laboratory of Atmospheric Processes and Their Impacts, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland; Institute for Chemical Engineering Sciences, Foundation of Research and Technology Hellas, Patras, 26504, Greece
推荐引用方式 GB/T 7714	Methymaki G.,Bossioli E.,Kalogiros J.,et al. Aerosol absorption over the Aegean Sea under northern summer winds[J],2020,231.
APA	Methymaki G..,Bossioli E..,Kalogiros J..,Kouvarakis G..,Mihalopoulos N..,...&Tombrou M..(2020).Aerosol absorption over the Aegean Sea under northern summer winds.Atmospheric Environment,231.
MLA	Methymaki G.,et al."Aerosol absorption over the Aegean Sea under northern summer winds".Atmospheric Environment 231(2020).