Constraining aerosol optical models using ground-based, collocated particle size and mass measurements in variable air mass regimes during the 7-SEAS/Dongsha experiment

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Title:	Constraining aerosol optical models using ground-based, collocated particle size and mass measurements in variable air mass regimes during the 7-SEAS/Dongsha experiment
Authors:	林能暉;Bell, Shaun W.;Hansell, Richard A.;Chow, Judith C.;Tsay, Si-Chee;Hsu, N. Christina;Lin, Neng-Huei;Wang, Sheng-Hsiang;Ji, Qiang;Li, Can;Watson, John G.;Khlystov, Andrey
Contributors:	地球科學學院大氣科學學系
Keywords:	Absorption;Aerosols;air;air pollution;atmospheric chemistry;carbon;climate;coasts;nitrates;organic matter;particle size;refractive index;remote sensing;Scattering;soil;spring;Taiwan;water vapor
Date:	2013-10-01
Issue Date:	2026-04-21 13:44:01 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： During the spring of 2010, NASA Goddard's COMMIT ground-based mobile laboratory was stationed on Dongsha Island off the southwest coast of Taiwan, in preparation for the upcoming 2012 7-SEAS field campaign. The measurement period offered a unique opportunity for conducting detailed investigations of the optical properties of aerosols associated with different air mass regimes including background maritime and those contaminated by anthropogenic air pollution and mineral dust. What appears to be the first time for this region, a shortwave optical closure experiment (λ = 550 nm) for both scattering and absorption was attempted over a 12-day period during which aerosols exhibited the most change. Constraints to the optical model included combined SMPS and APS number concentration data for a continuum of fine and coarse-mode particle sizes up to PM2.5. We also take advantage of an IMPROVE chemical sampler to help constrain aerosol composition and mass partitioning of key elemental species including sea-salt, particulate organic matter, soil, non sea-salt sulfate, nitrate, and elemental carbon. Achieving full optical closure is hampered by limitations in accounting for the role of water vapor in the system, uncertainties in the instruments and the need for further knowledge in the source apportionment of the model's major chemical components. Nonetheless, our results demonstrate that the observed aerosol scattering and absorption for these diverse air masses are reasonably captured by the model, where peak aerosol events and transitions between key aerosols types are evident. Signatures of heavy polluted aerosol composed mostly of ammonium and non sea-salt sulfate mixed with some dust with transitions to background sea-salt conditions are apparent in the absorption data, which is particularly reassuring owing to the large variability in the imaginary component of the refractive indices. Consistency between the measured and modeled optical parameters serves as an important link for advancing remote sensing and climate research studies in dynamic aerosol-rich environments like Dongsha. ► First time attempt of optical closure at Dongsha in a dynamic aerosol environment. ► Observed optical properties are reasonably tracked by an optical model. ► Peak aerosol events and transitions between key types are captured. ► More resolved aerosol physicochemical datasets are needed for full optical closure. 出版者： Elsevier Ltd 出版日期： 2013-10 出處： Atmospheric environment (1994), 2013-10, Vol.78, p.163-173 資源來源： ScienceDirect Journals 版權： 2012 Elsevier Ltd 識別號： ISSN: 1352-2310 識別號： ISSN: 1873-2844 識別號： EISSN: 1873-2844 識別號： DOI: 10.1016/j.atmosenv.2012.06.057
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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