DOI: 10.1016/j.atmosenv.2020.117533
论文题名: Aerosol absorption over the Aegean Sea under northern summer winds
作者: Methymaki G. ; Bossioli E. ; Kalogiros J. ; Kouvarakis G. ; Mihalopoulos N. ; Nenes A. ; Tombrou M.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 231 语种: 英语
英文关键词: 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
学科: Aerosol absorption
; Aerosol-radiation interaction
; Black carbon absorption
; Direct effect
; heating rate
; Mediterranean
; Semi-direct effect
; WRF-Chem
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160324
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Methymaki G.,Bossioli E.,Kalogiros J.,et al. Aerosol absorption over the Aegean Sea under northern summer winds[J]. Atmospheric Environment,2020-01-01,231