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In-Situ and Remotely-Sensed Observations of Biomass Burning Aerosols at Doi Ang Khang, Thailand During 7-SEAS BASELInE 2015

Authors :
Sayer, Andrew M
Hsu, N. Christina
Hsiao, Ta-Chih
Pantina, Peter
Kuo, Ferret
Ou-Yang, Chang-Feng
Holben, Brent N
Janjai, Serm
Chantara, Somporn
Wang, Sheng-Hsiang
Loftus, Adrian M
Lin, Neng-Huei
Tsay, Si-Chee
Source :
Aerosol and Air Quality Research. 16(11)
Publication Year :
2016
Publisher :
United States: NASA Center for Aerospace Information (CASI), 2016.

Abstract

The spring 2015 deployment of a suite of instrumentation at Doi Ang Khang (DAK) in northwestern Thailand enabled the characterization of air masses containing smoke aerosols from burning predominantly in Myanmar. Aerosol Robotic Network (AERONET) Sun photometer data were used to validate Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6 "Deep Blue" aerosol optical depth (AOD) retrievals; MODIS Terra and Aqua provided results of similar quality, with correlation coefficients of 0.93-0.94 and similar agreement within expected uncertainties to global-average performance. Scattering and absorption measurements were used to compare surface and total column aerosol single scatter albedo (SSA); while the two were well-correlated, and showed consistent positive relationships with moisture (increasing SSA through the season as surface relative humidity and total columnar water vapor increased), in situ surface-level SSA was nevertheless significantly lower by 0.12-0.17. This could be related to vertical heterogeneity and/or instrumental issues. DAK is at approximately 1,500 meters above sea level in heterogeneous terrain, and the resulting strong diurnal variability in planetary boundary layer depth above the site leads to high temporal variability in both surface and column measurements, and acts as a controlling factor to the ratio between surface particulate matter (PM) levels and column AOD. In contrast, while some hygroscopic effects were observed relating to aerosol particle size and Angstrom exponent, relative humidity variations appear to be less important for this ratio here. As part of the Seven South-East Asian Studies (7-SEAS) project, the Biomass-burning Aerosols & Stratocumulus Environment: Lifecycles and Interactions Experiment (BASELInE) was intended to probe physicochemical processes, interactions, and feedbacks related to biomass burning aerosols and clouds during the spring burning season (February-April) in southeast Asia (SEA).

Subjects

Subjects :
Environment Pollution

Details

Language :
English
ISSN :
20711409 and 16808584
Volume :
16
Issue :
11
Database :
NASA Technical Reports
Journal :
Aerosol and Air Quality Research
Notes :
NNG11HP16A, , NNG12HP08C, , NNX12AD03A
Publication Type :
Report
Accession number :
edsnas.20180002862
Document Type :
Report
Full Text :
https://doi.org/10.4209/aaqr.2015.08.0500