University Of Tasmania

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

journal contribution
posted on 2023-05-19, 01:02 authored by Janjai, S, Buntoung, S, Manuel NunezManuel Nunez, Chiwpreecha, K, Pattarapanitchai, S
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 1–2 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.


Publication title

Journal of Atmospheric and Solar-Terrestrial Physics








School of Geography, Planning and Spatial Sciences



Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Rights statement

Copyright 2016 Elsevier Ltd.

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  • Restricted

Socio-economic Objectives

Air quality

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