A Climatological Study of Tropical Cyclone Rainfall in Vietnam

Nguyen-Thi, Hoang Anh; Matsumoto, Jun; Ngo‐Duc, Thanh; Endo, Noritaka

doi:10.2151/sola.2012-011

Cited by 53 publications

(35 citation statements)

References 16 publications

(21 reference statements)

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“…In Vietnam, the rainfall distribution has a generally north−south orientation. The maximum rainfall in central Vietnam usually occurs in October associated with the winter monsoon and typhoon activities (Nguyen-Thi et al 2012). …”

Section: Sub-region Selection For Regional Analysismentioning

confidence: 99%

Sensitivity of Southeast Asia rainfall simulations to cumulus and air-sea flux parameterizations in RegCM4

Juneng¹,

Tangang²,

Chung³

et al. 2016

Clim. Res.

118

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We investigated the performance of RegCM4 in simulating rainfall over Southeast Asia with different combinations of deep-convection and air−sea flux parameterization schemes. Four different gridded rainfall datasets were used for the model assessment. In general, the simulations produced dry biases over the equatorial region and slightly wet biases over mainland Indo-China, except those experiments with the MIT Emanuel cumulus schemes, in which large positive rainfall biases were simulated. However, simulations with the MIT schemes were generally better at reproducing annual rainfall variations. The simulations were not sensitive to the treatment of air−sea fluxes. While the simulations generally produced the rainfall climatology well, all simulations showed stronger inter-annual variability compared to observations. Nevertheless, the time evolution of the inter-annual variations was well reproduced, particularly over the eastern Maritime Continent. Over mainland Southeast Asia, all simulations produced unrealistic rainfall anomaly responses to surface temperature. The lack of summer air−sea interactions in the model resulted in enhanced oceanic forcing over the regions, leading to positive rainfall anomalies during years with warm ocean temperature anomalies. This shortcoming in turn caused much stronger atmospheric forcing on the land surface processes compared to that of the observation. A robust score-ranking system was designed to rank the simulations according to their performance in reproducing different aspects of rainfall characteristics. The results suggest that the simulation with the MIT Emanuel convective scheme and the BATS1e air−sea flux scheme performs better overall compared to the rest of the simulations.

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Section: Sub-region Selection For Regional Analysismentioning

confidence: 99%

Sensitivity of Southeast Asia rainfall simulations to cumulus and air-sea flux parameterizations in RegCM4

Juneng¹,

Tangang²,

Chung³

et al. 2016

Clim. Res.

118

View full text Add to dashboard Cite

show abstract

“…Takahashi and Yasunari (2006) and Takahashi et al (2015) showed that the active and break phases of rainfall in Thailand during the summer monsoon season were brought by the westward propagation of precipitation systems from the western North Pacific. For the post-monsoon season, Nguyen-Thi et al (2012) showed that approximately 20% of the rainfall in the central Vietnam coastal area was brought by tropical cyclones, and Chen et al (2012) showed that the heavy rainfall in Vietnam was basically by the westward-moving disturbances and not due to the northeasterly monsoon itself. Takahashi (2013) investigated clouds and rainfall over the Indochina Peninsula in the post-monsoon season and showed that their characteristics changed within this season, with well-developed cloud-precipitation systems and large rainfall during October and November and low clouds with little rainfall in December, January, and February.…”

Section: Intra-seasonal Variability and Synoptic-scale Influencesmentioning

confidence: 99%

Diurnal pattern of rainfall in Cambodia: its regional characteristics and local circulation

Tsujimoto

Ohta²,

Aida

et al. 2018

Prog Earth Planet Sci

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We analyze the hourly rainfall data of 30 rain gauges in Cambodia from 2010 to 2015 to focus on the diurnal pattern of rainfall and its regional characteristics, with the underlying mechanisms inferred from the observed data. The observed annual rainfall in inland Cambodia ranges from 1087 to 1528 mm on station-average. Approximately 5-20% of the annual rainfall occurs during the pre-monsoon season, 50-78% during the summer monsoon season, and 12-36% during the post-monsoon season. During the pre-monsoon season, rainfall is dominant on the coast and over the Cardamom Mountains, with a maximum in the afternoon. The rainfall amount is smaller around the Tonle Sap Lake. During the summer monsoon season, rainfall is larger in the northern region and smaller in the western region in inland Cambodia, in both amount and proportion to annual rainfall. The rainfall amount on the coast is distinctively large. The diurnal rainfall maximum occurs in the early afternoon in the Cardamom Mountains, in the afternoon on the plain at the southwestern side of the Tonle Sap Lake, in the evening on the wide area of the northeastern side of the lake, and in the early morning on the coast. The clear regional characteristics in the diurnal rainfall pattern suggest significant effects of local features, even during the Asian summer monsoon season. During the post-monsoon season, rainfall is larger on the southwestern side of the Tonle Sap Lake with dominant nocturnal rainfall. These diurnal patterns are, however, not clear on some days, and analysis of the synoptic-scale atmospheric condition suggests the effect of the large-scale low-pressure system and disturbances on the appearance of the clear diurnal rainfall pattern. The effect of land-lake and mountain-valley circulations on forming the diurnal rainfall pattern is also implied from ground-observed meteorological data, although further numerical studies are required to examine the detailed mechanisms. The study of local effects on rainfall with consideration of the landsurface dynamics may aid flood and drought management in Cambodia by facilitating a greater understanding of its rainfall pattern.

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“…Nguyen-Thi et al (2012a) used the Unisys best track data (http://weather.unisys.com) to analyze the tropical cyclone frequency in the coastal zone of Vietnam for the period 1961À2008 (Figure 8.3). According to ISPONRE (2009), there were on average 6.9 tropical cyclones per year that had a direct impact on Vietnam during the period 1961À2000.…”

Section: Tropical Cyclonesmentioning

confidence: 99%

“…The horizontal axis shows the 12 months of the year.intense tropical cyclones in the East Sea appears to have increased, while the tropical cyclone season is likely to end later Nguyen-Thi et al (2012a). The horizontal axis shows the 12 months of the year.intense tropical cyclones in the East Sea appears to have increased, while the tropical cyclone season is likely to end later Nguyen-Thi et al (2012a).…”

mentioning

confidence: 99%