Variability of rainfall in Peninsular Malaysia
Open Access
- 7 August 2009
- preprint content
- Published by Copernicus GmbH in Hydrology and Earth System Sciences Discussions
- Vol. 6 (4), 5471-5503
- https://doi.org/10.5194/hessd-6-5471-2009
Abstract
This study analyzed and quantified the spatial patterns and time-variability of rainfall in Peninsular Malaysia on monthly, yearly and monsoon temporal scales. We first obtained an overview of rainfall patterns through the analysis of 16 point data sources. The results led to choosing three distinct regions, i.e.~the east coast, inland and west coast regions. For detailed analysis, Shepard's interpolation scheme was applied to the station data to produce daily rainfall fields on a 0.05 degree resolution grids for the period 1971–2006. The rainfall characteristics in time and space derived from a frequency analysis were found to be distinctly different in these three regions. In the east coast region, monthly rainfall shows a significant periodicity dominated by an annual cycle, followed by a half-year cycle. The inland and west coast regions show that the dominant periodic fluctuations in the monthly rainfall are dominated by a half-year cycle, followed by an annual cycle. The long-term rainfall variability analysis shows that the dry and wet conditions in Peninsular Malaysia are not primarily governed by the ENSO events. The results from the individual regions suggest that although the relative variability is influenced by ENSO, local and regional conditions have an effect on the interannual rainfall variability, which is superimposed on the large-scale weather conditions. A significant increasing trends in annual rainfall (9.3 mm/year) and northeast monsoon rainfall (6.2 mm/monsoon) were only detected in the west coast region. No trend was found in the monthly rainfall, except for November in the west coast region. The spatial variation analysis shows that the east coast region, which received substantially higher amounts of rainfall during the northeast monsoon, has lower spatial rainfall variability and a more uniform rainfall distribution than other regions. A larger range for the monthly spatial variation was observed in the west coast region.Keywords
This publication has 27 references indexed in Scilit:
- Variability of rainfall in Peninsular MalaysiaHydrology and Earth System Sciences Discussions, 2009
- Investigating the impacts of adjoining wet days on the distribution of daily rainfall amounts in Peninsular MalaysiaJournal of Hydrology, 2009
- On the roles of the northeast cold surge, the Borneo vortex, the Madden‐Julian Oscillation, and the Indian Ocean Dipole during the extreme 2006/2007 flood in southern Peninsular MalaysiaGeophysical Research Letters, 2008
- Case study for determination of a water level monitoring frequency for nationwide groundwater monitoring networks in KoreaJournal of Hydrology, 2007
- Fitting Daily Rainfall Amount in Malaysia Using the Normal Transform DistributionJournal of Applied Sciences, 2007
- Numerical case study of an extreme rainfall event during 9–11 December 2004 over the east coast of Peninsular MalaysiaArchiv für Meteorologie, Geophysik und Bioklimatologie Serie A, 2007
- Low frequency and quasi‐biennial oscillations in the Malaysian precipitation anomalyInternational Journal of Climatology, 2001
- Sampling frequency for monitoring the actual state of groundwater systemsJournal of Hydrology, 1996
- Rainfall patterns in IndiaJournal of Climatology, 1986
- Temporal Variations of Satellite-Observed Outgoing Longwave Radiation over the Winter Monsoon Region. Part I: Long-Period (15–30 Day) OscillationsMonthly Weather Review, 1980