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Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate

The Bowen ratio method was applied to determine dry deposition velocity of SO2 over rice paddy in the tropical climate condition (hot and humid). The meteorological parameters and SO2 concentration required by the method were monitored online during July – December 2007. The deposition velocity was...

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Main Authors: Orachorn Chimjan,, Pojanee Khummongkol,
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2012
Online Access:http://journalarticle.ukm.my/4862/1/12%2520Orachorn.pdf
http://journalarticle.ukm.my/4862/
http://www.ukm.my/jsm/contents.html
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spelling my-ukm.journal.48622016-12-14T06:37:09Z http://journalarticle.ukm.my/4862/ Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate Orachorn Chimjan, Pojanee Khummongkol, The Bowen ratio method was applied to determine dry deposition velocity of SO2 over rice paddy in the tropical climate condition (hot and humid). The meteorological parameters and SO2 concentration required by the method were monitored online during July – December 2007. The deposition velocity was evaluated under the wet and dry climatic conditions. The median values of the velocity in daytime in the wet season were in ranges of 0.24 - 0.41 cm s-1, and 0.42 - 0.77 cm s-1 in the dry season. The SO2 dry deposition velocity was found to be very low for all the nighttime measurements and independent of seasonal variation. A relationship between the deposition velocity and the humidity was seen in which the SO2 velocity inversely increased with the relative humidity. The velocity determined by the Bowen ratio study was compared to Wesely resistance model. The comparative study showed that the SO2 deposition velocity obtained by the resistance model was higher than the Bowen ratio in the wet season (high humidity) but lower in the dry season (low humidity). This indicated the effect of humidity on the deposition velocity under the tropical climatology. The parameterization terms to calculate the SO2 deposition in the resistance model need to be modified for the tropical region. Universiti Kebangsaan Malaysia 2012-06 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/4862/1/12%2520Orachorn.pdf Orachorn Chimjan, and Pojanee Khummongkol, (2012) Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate. Sains Malaysiana, 41 (6). pp. 747-754. ISSN 0126-6039 http://www.ukm.my/jsm/contents.html
institution Universiti Kebangsaan Malaysia
building Perpustakaan Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description The Bowen ratio method was applied to determine dry deposition velocity of SO2 over rice paddy in the tropical climate condition (hot and humid). The meteorological parameters and SO2 concentration required by the method were monitored online during July – December 2007. The deposition velocity was evaluated under the wet and dry climatic conditions. The median values of the velocity in daytime in the wet season were in ranges of 0.24 - 0.41 cm s-1, and 0.42 - 0.77 cm s-1 in the dry season. The SO2 dry deposition velocity was found to be very low for all the nighttime measurements and independent of seasonal variation. A relationship between the deposition velocity and the humidity was seen in which the SO2 velocity inversely increased with the relative humidity. The velocity determined by the Bowen ratio study was compared to Wesely resistance model. The comparative study showed that the SO2 deposition velocity obtained by the resistance model was higher than the Bowen ratio in the wet season (high humidity) but lower in the dry season (low humidity). This indicated the effect of humidity on the deposition velocity under the tropical climatology. The parameterization terms to calculate the SO2 deposition in the resistance model need to be modified for the tropical region.
format Article
author Orachorn Chimjan,
Pojanee Khummongkol,
spellingShingle Orachorn Chimjan,
Pojanee Khummongkol,
Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
author_facet Orachorn Chimjan,
Pojanee Khummongkol,
author_sort Orachorn Chimjan,
title Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
title_short Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
title_full Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
title_fullStr Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
title_full_unstemmed Evaluation of dry deposition velocity of So2 by Bowen Ratio and resistance model over rice paddy in tropical climate
title_sort evaluation of dry deposition velocity of so2 by bowen ratio and resistance model over rice paddy in tropical climate
publisher Universiti Kebangsaan Malaysia
publishDate 2012
url http://journalarticle.ukm.my/4862/1/12%2520Orachorn.pdf
http://journalarticle.ukm.my/4862/
http://www.ukm.my/jsm/contents.html
_version_ 1643736230153682944
score 13.251813

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