Abstract
This study aims to provide a basic understanding of diurnal rainfall climatology and its mechanisms in Peninsular Malaysia by utilising observation data. The analysis of rainfall amount, frequency and intensity showed 4 main diurnal rainfall events: the occurrence of afternoon rainfall maximum at the foothills of Titiwangsa Mountain Range during the inter-monsoon periods was heavy and frequently occurred; the occurrence of rainfall throughout entire day over the east coast of peninsula (PT sub-region) during northeast monsoon was heavy and frequently occurred; the occurrence of entire day rain over the inland-valley (LP sub-region) area during northeast monsoon was low despite heavy rainfall often occurred in the afternoon; and the occurrence of morning rainfall maximum was an extreme rainfall event but with low in frequency over the west coast of peninsula (PB sub-region) during June-July-August-September-October-November (JJASON). During the inter-monsoon periods, stronger surface wind and weaker at higher tropospheric level caused vertical wind shear over the PB sub-region. On the other hand, superimposition of monsoonal flow and sea breeze during southwest monsoon resulted downward shear in the sub-region. During the northeast monsoon, combination of cold surges and sea breezes modulate strong wind from the surface up to 2 km height. This causes a convection zone which was confined over the PT sub-region in the morning to extend into LP sub-region in the afternoon.
| Original language | Malay |
|---|---|
| Pages (from-to) | 509-522 |
| Number of pages | 14 |
| Journal | Sains Malaysiana |
| Volume | 48 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2019 |
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Klimatologi hujan diurnal dan bayu laut-darat di semenanjung Malaysia. / Jamaluddin, Ahmad Fairudz; Tangang @ Tajudin Mahmud, Fredolin; Wan Ibadullah, Wan Maisarah; Liew, Ju Neng; Yik, Diong Jeong; Salimun, Ester; Dindang, Ambun; Abdullah, Muhammad Helmi.
In: Sains Malaysiana, Vol. 48, No. 3, 01.03.2019, p. 509-522.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Klimatologi hujan diurnal dan bayu laut-darat di semenanjung Malaysia
AU - Jamaluddin, Ahmad Fairudz
AU - Tangang @ Tajudin Mahmud, Fredolin
AU - Wan Ibadullah, Wan Maisarah
AU - Liew, Ju Neng
AU - Yik, Diong Jeong
AU - Salimun, Ester
AU - Dindang, Ambun
AU - Abdullah, Muhammad Helmi
PY - 2019/3/1
Y1 - 2019/3/1
N2 - This study aims to provide a basic understanding of diurnal rainfall climatology and its mechanisms in Peninsular Malaysia by utilising observation data. The analysis of rainfall amount, frequency and intensity showed 4 main diurnal rainfall events: the occurrence of afternoon rainfall maximum at the foothills of Titiwangsa Mountain Range during the inter-monsoon periods was heavy and frequently occurred; the occurrence of rainfall throughout entire day over the east coast of peninsula (PT sub-region) during northeast monsoon was heavy and frequently occurred; the occurrence of entire day rain over the inland-valley (LP sub-region) area during northeast monsoon was low despite heavy rainfall often occurred in the afternoon; and the occurrence of morning rainfall maximum was an extreme rainfall event but with low in frequency over the west coast of peninsula (PB sub-region) during June-July-August-September-October-November (JJASON). During the inter-monsoon periods, stronger surface wind and weaker at higher tropospheric level caused vertical wind shear over the PB sub-region. On the other hand, superimposition of monsoonal flow and sea breeze during southwest monsoon resulted downward shear in the sub-region. During the northeast monsoon, combination of cold surges and sea breezes modulate strong wind from the surface up to 2 km height. This causes a convection zone which was confined over the PT sub-region in the morning to extend into LP sub-region in the afternoon.
AB - This study aims to provide a basic understanding of diurnal rainfall climatology and its mechanisms in Peninsular Malaysia by utilising observation data. The analysis of rainfall amount, frequency and intensity showed 4 main diurnal rainfall events: the occurrence of afternoon rainfall maximum at the foothills of Titiwangsa Mountain Range during the inter-monsoon periods was heavy and frequently occurred; the occurrence of rainfall throughout entire day over the east coast of peninsula (PT sub-region) during northeast monsoon was heavy and frequently occurred; the occurrence of entire day rain over the inland-valley (LP sub-region) area during northeast monsoon was low despite heavy rainfall often occurred in the afternoon; and the occurrence of morning rainfall maximum was an extreme rainfall event but with low in frequency over the west coast of peninsula (PB sub-region) during June-July-August-September-October-November (JJASON). During the inter-monsoon periods, stronger surface wind and weaker at higher tropospheric level caused vertical wind shear over the PB sub-region. On the other hand, superimposition of monsoonal flow and sea breeze during southwest monsoon resulted downward shear in the sub-region. During the northeast monsoon, combination of cold surges and sea breezes modulate strong wind from the surface up to 2 km height. This causes a convection zone which was confined over the PT sub-region in the morning to extend into LP sub-region in the afternoon.
KW - Diurnal rainfall
KW - Land-sea breeze
KW - Peninsular Malaysia
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U2 - 10.17576/jsm-2019-4803-03
DO - 10.17576/jsm-2019-4803-03
M3 - Article
VL - 48
SP - 509
EP - 522
JO - Sains Malaysiana
JF - Sains Malaysiana
SN - 0126-6039
IS - 3
ER -