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The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia

Prolonged events of heavy rainfall which commenced in September 1999 and continued until January 2000 during the northeast monsoon over the Malaysian Peninsula showed that the enhanced rainfall conditions were related to the larger scale La Nina phenomenon. This was substantiated by large-scale obse...

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Main Author: Mastura Mahmud,
Format: Article
Language:English
Published: Faculty of Social Sciences and Humanities, UKM,Bangi 2006
Online Access:http://journalarticle.ukm.my/1567/1/1.pdf
http://journalarticle.ukm.my/1567/
http://www.ukm.my/geografia
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spelling my-ukm.journal.15672016-12-14T06:29:48Z http://journalarticle.ukm.my/1567/ The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia Mastura Mahmud, Prolonged events of heavy rainfall which commenced in September 1999 and continued until January 2000 during the northeast monsoon over the Malaysian Peninsula showed that the enhanced rainfall conditions were related to the larger scale La Nina phenomenon. This was substantiated by large-scale observational features, such as the monthly precipitation, anomaly of outward long wave radiation, zonal and meridional wind fields at the lower and upper levels, vorticity and vertical motion, that exhibited a disparity from the El Nino conditions of 1997. Low-level convergence concentrating over the maritime continent coincided with the region of enhanced rainfall. The more frequent occurrences of heavy rainfall and flooding during this period fell within the La Nina episode, occurring approximately two years after the major dry episode of the El Nino phenomenon. The enhanced rainfall encountered by Peninsular Malaysia was considered to be related to the transitional phase of the Tropical Biennial Oscillation. The causes of these heavy rainfall episodes were variable and included the localized and organized enhanced afternoon convection resulting from the radiative diurnal cooling and heating effects. The heavy rainfall in early October 1999 was associated with the presence of the confluence of airstreams along the Malaysian Peninsula at cyclonic vortices of 850, 250 and 100 hPa over the northern Malaysian Peninsula. Two westward propagating tropical cyclones which existed over the Bay of Bengal and the Gulf of Siam were among the main contributors to the heavy rainfall over the region during October Faculty of Social Sciences and Humanities, UKM,Bangi 2006 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/1567/1/1.pdf Mastura Mahmud, (2006) The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia. Geografia : Malaysian Journal of Society and Space, 2 (1). pp. 1-18. ISSN 2180-2491 http://www.ukm.my/geografia
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 Prolonged events of heavy rainfall which commenced in September 1999 and continued until January 2000 during the northeast monsoon over the Malaysian Peninsula showed that the enhanced rainfall conditions were related to the larger scale La Nina phenomenon. This was substantiated by large-scale observational features, such as the monthly precipitation, anomaly of outward long wave radiation, zonal and meridional wind fields at the lower and upper levels, vorticity and vertical motion, that exhibited a disparity from the El Nino conditions of 1997. Low-level convergence concentrating over the maritime continent coincided with the region of enhanced rainfall. The more frequent occurrences of heavy rainfall and flooding during this period fell within the La Nina episode, occurring approximately two years after the major dry episode of the El Nino phenomenon. The enhanced rainfall encountered by Peninsular Malaysia was considered to be related to the transitional phase of the Tropical Biennial Oscillation. The causes of these heavy rainfall episodes were variable and included the localized and organized enhanced afternoon convection resulting from the radiative diurnal cooling and heating effects. The heavy rainfall in early October 1999 was associated with the presence of the confluence of airstreams along the Malaysian Peninsula at cyclonic vortices of 850, 250 and 100 hPa over the northern Malaysian Peninsula. Two westward propagating tropical cyclones which existed over the Bay of Bengal and the Gulf of Siam were among the main contributors to the heavy rainfall over the region during October
format Article
author Mastura Mahmud,
spellingShingle Mastura Mahmud,
The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
author_facet Mastura Mahmud,
author_sort Mastura Mahmud,
title The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
title_short The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
title_full The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
title_fullStr The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
title_full_unstemmed The La Nina episode and the heavy winter rainfall of 1999 over Peninsular Malaysia
title_sort la nina episode and the heavy winter rainfall of 1999 over peninsular malaysia
publisher Faculty of Social Sciences and Humanities, UKM,Bangi
publishDate 2006
url http://journalarticle.ukm.my/1567/1/1.pdf
http://journalarticle.ukm.my/1567/
http://www.ukm.my/geografia
_version_ 1643735068548530176
score 13.211869

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