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Meteorological factors affecting lower tropospheric ozone mixing ratios in Bangkok, Thailand

Citation

Janjai, S and Buntoung, S and Nunez, M and Chiwpreecha, K and Pattarapanitchai, S, Meteorological factors affecting lower tropospheric ozone mixing ratios in Bangkok, Thailand, Journal of Atmospheric and Solar-Terrestrial Physics, 147 pp. 76-89. ISSN 1364-6826 (2016) [Refereed Article]


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DOI: doi:10.1016/j.jastp.2016.07.008

Abstract

This paper examines the influence of meteorological conditions in ozone mixing ratio measured at the Thai Meteorological Department (TMD) in Bangkok, Thailand. In addition to surface wind speed and direction, surface ozone concentrations, ozonesondes and CALIPSO Lidar images were collected during the study period extending from 01/01/2014 to 30/04/2015. Surface ozone concentrations show a strong seasonality, with maximum in the dry months of December to April and minimum during the wet southwest (SW) monsoon period extending from May to October. High ozone concentrations are related to biomass burning in the northeast highland regions of the country and neighboring Myanmar and southern China. These precursors travel in a southerly direction towards Bangkok in a well-defined aerosol layer which may be at ground level or at elevated heights. The growth of the daytime mixed layer scavenges some of the upper level aerosols, although local maxima in ozone concentrations at 12 km are a frequent feature at Bangkok. There is an evidence of fumigation in the Gulf of Thailand and a return flow via the southerly sea breezes.

Item Details

Item Type:Refereed Article
Keywords:tropospheric ozone
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Meteorology
Objective Division:Environment
Objective Group:Air Quality
Objective Field:Urban and Industrial Air Quality
Author:Nunez, M (Dr Manuel Nunez)
ID Code:113786
Year Published:2016
Deposited By:Geography and Spatial Science
Deposited On:2017-01-20
Last Modified:2017-01-20
Downloads:0

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