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...

Full description

Bibliographic Details
Main Authors:	Orachorn Chimjan, Pojanee Khummongkol
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2012
Online Access:	http://journalarticle.ukm.my/4862/ http://journalarticle.ukm.my/4862/ http://journalarticle.ukm.my/4862/1/12%2520Orachorn.pdf

id	ukm-4862
recordtype	eprints
spelling	ukm-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
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
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/ http://journalarticle.ukm.my/4862/ http://journalarticle.ukm.my/4862/1/12%2520Orachorn.pdf
first_indexed	2023-09-18T19:42:44Z
last_indexed	2023-09-18T19:42:44Z
_version_	1777405698110390272

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

Similar Items