气候变化领域集成服务门户(CCPortal): Year-round aerosol characteristics and radiative effects in the South Asian pollution outflow over a background site in the Maldives

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DOI	10.1016/j.atmosenv.2020.117813
	Year-round aerosol characteristics and radiative effects in the South Asian pollution outflow over a background site in the Maldives
	Ramachandran S.; Rupakheti M.
发表日期	2020
ISSN	13522310
卷号	240
英文摘要	Aerosol radiative properties using recently available high-quality columnar aerosol data collected at several AERONET sites in South Asia, with a focus on pollution outflow from continental South Asia observed over Hanimaadhoo in Maldives, a small island in northern Indian Ocean are quantified. The seasonal mean aerosol optical depth (AOD) over Hanimaadhoo is ≥ 0.3 (except ca. 0.2 during monsoon season), and single scattering albedo (SSA) is > 0.90 in all seasons. Fine mode aerosols contribute dominantly to AOD. SSA decreases as a function of wavelength due to influence of continental aerosols, except during the monsoon season when its spectral trend reverses due to increase in dust. Carbonaceous aerosols dominate (>90%) contribution to absorption AOD (AAOD). Black carbon (BC) and brown carbon (BrC) contribute >75% and <25%, respectively, to AAOD due to carbonaceous aerosols. The observed seasonal mean aerosol radiative forcing at the surface (ARFSFC), at the top of the atmosphere (ARFTOP) and in the atmosphere (ARFATM) is > −25 Wm-2, >−20 Wm-2 and ~+20 Wm-2, respectively. Aerosol loading and atmospheric heating have increased over this background site over the last decade. A regional-scale analysis of aerosol properties and radiative effects across and surrounding the Indo-Gangetic Plain (IGP) shows that AOD is ≥ 0.3 over entire region, and aerosols reduce seasonally 30–50 Wm-2 of solar radiation reaching the surface, contributing significantly to solar dimming effect. The atmospheric solar heating rate due to aerosols (HR) is ≥ 1 K day−1 across IGP. These high ARFs, ARFESFC and HR, and increasing trends have significant implications to climate and hydrological cycle over South Asia and beyond. © 2020 Elsevier Ltd
英文关键词	Absorption; Atmospheric aerosols; Background site; Characteristics; Pollution outflow; Radiative effects; South Asia
语种	英语
scopus关键词	Atmospheric aerosols; Atmospheric radiation; Atmospheric thermodynamics; Bromine compounds; Carbon; Radiation effects; Solar radiation; Aerosol characteristics; Aerosol optical depths; Aerosol radiative forcing; Indo-Gangetic Plains; Northern indian oceans; Regional scale analysis; Single scattering albedo; Top of the atmospheres; Air pollution; black carbon; carbon; absorption; AERONET; aerosol composition; albedo; brown carbon; heating; hydrological cycle; light scattering; monsoon; optical depth; radiative forcing; radiative transfer; solar radiation; absorption; aerosol; albedo; Article; atmosphere; biomass; climate; heating; hydrology; Maldives; meteorology; optical depth; pollution; priority journal; radiation measurement; radiative forcing; rainy season; refraction index; season; solar radiation; South Asian; surface property; Gangetic Plain; Hanimaadhoo; Indian Ocean; Maldives; South Asia
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/144982
作者单位	Physical Research Laboratory, Ahmedabad, India; Institute for Advanced Sustainability Studies, Germany
推荐引用方式 GB/T 7714	Ramachandran S.,Rupakheti M.. Year-round aerosol characteristics and radiative effects in the South Asian pollution outflow over a background site in the Maldives[J],2020,240.
APA	Ramachandran S.,&Rupakheti M..(2020).Year-round aerosol characteristics and radiative effects in the South Asian pollution outflow over a background site in the Maldives.Atmospheric Environment,240.
MLA	Ramachandran S.,et al."Year-round aerosol characteristics and radiative effects in the South Asian pollution outflow over a background site in the Maldives".Atmospheric Environment 240(2020).