The Second Rainy Stage Onset in the Central Highlands of Vietnam

Bui-Manh, Hai; Peng, Chi Ming; Fu, Yen‐Ta; Dinh, Duc Tu; Lin, Neng Huei; Yen, Ming Cheng

doi:10.1029/2021gl093107

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…The primary water vapor flux is depicted by ψ and illustrated by (ψ ,Q ,W), whereas precipitation is mainly maintained by the convergence of water vapor flux (-∇•Q), which can be exemplified by (χ , Q ,P) (Yen et al, 2011;Chen et al, 2012a;Bui-Manh et al, 2021).…”

Section: Water Vapor Budget Analysesmentioning

confidence: 99%

Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

Dinh

Bui-Manh

Le³

et al. 2023

Preprint

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Based on station monthly observational statistics, the major rainfall in the Red River Delta (RRD) occurs in late summer (July–September) with conspicuous year-to-year variation. Using the ± 0.8 of the seasonal total rainfall standard deviation as criteria, seven wet and six dry years are identified over the period 1983–2015. In addition to the mean rainfall in wet years being nearly double that in dry years, the occurrence frequency of heavy rainfall days and their corresponding rainfall accumulation in wet (dry) years are higher (lower) than climatology–in particular, the average rainfall accumulation during heavy rainfall days in wet years is more than four times as much as that in dry years. As revealed from further analyses, the large variability in rainfall is attributed to the influence of tropical cyclones (TCs) and 7–24- and 30– 60-day intraseasonal oscillations (ISOs). During the wet (dry) years, the number of TCs affecting the RRD and rainfall produced by TCs are more (less), and the intensity of ISOs also enhances (reduces). It is found from the water vapor budget analyses that an anomalous cyclone (anticyclone) dominates over the Indochina Peninsula in wet (dry) years, resulting in more (less) water vapor being transported to the RRD, whereas the anomalous convergence (divergence) of water vapor flux leads to the maintenance of excessive (insufficient) rainfall over the RRD. However, the El Niño–Southern Oscillation (ENSO) forcing shows minor effects on the interannual variation in rainfall in the RRD.

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Section: Water Vapor Budget Analysesmentioning

confidence: 99%

Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

Dinh

Bui-Manh

Le³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…We used only the rainfall parameter to successfully determine both the onset and retreat dates for the rainy season over the Central Highlands of Vietnam 19 . To investigate the features of the active PM pollution season, we also proposed to determine the PMOD and PMRD by using only the PM parameter.…”

Section: Definition Of Pm Onset and Retreat Datesmentioning

confidence: 99%

Footprints of El Niño La Niña on the Particulate Matter evolution over Subtropical Island Taiwan

Yen

Lin

et al. 2022

Preprint

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Particulate matter (PM) pollution has become a major problem worldwide, with significant adversely health impacts, but the climatology of annual variations in and the effect of climate change on PM level are still not comprehensively evaluated. Here we show that the vertical motions of the East Asian winter and summer monsoon regulate the annual variation in PM over Taiwan. The PM pollution season starts and ends earlier during El Niño than during La Niña episodes. Furthermore, the onset, active, break, revival, and retreat phases of the PM pollution lifecycle are innovatively defined. Our results demonstrate that the annual seasonal cycle dominates wintertime PM pollution climate development during the active phase with a minor modulation by El Niño and La Niña episodes, whereas October and March, the seasonal transition periods, are significantly modulated by these two episodes. The findings suggest a novel dimension of the PM pollution research—lifecycle evolution effect.

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Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

Dinh

Bui-Manh

Le³

et al. 2023

Terr Atmos Ocean Sci

View full text Add to dashboard Cite

Based on station monthly observational statistics, the major rainfall in the Red River Delta (RRD) of Vietnam occurs in late summer (July–September) with conspicuous year-to-year variation. Using the ± 0.8 of the seasonal total rainfall standard deviation as criteria, seven wet and six dry years are identified over the period 1983–2015. In addition to the 70.5% of the seasonal total rainfall contributed by the heavy rainfall days, the distinct heavy rainfall accumulation difference between wet and dry years seems to fundamentally establish these two separated extreme wet and dry groups. As revealed from further analyses, the large variability in rainfall is attributed to the influence of tropical cyclones (TCs) and 7–24- and 30–60-day intraseasonal oscillations (ISOs); in particular, the number of TCs affecting the RRD and rainfall produced by TCs are more (less) during the wet (dry) years, and the amplitudes of ISOs are also enhanced (reduced). In many cases, heavy rainfall days are induced by the combined effect of both ISOs and TCs, while some heavy rainfall events are mainly triggered by ISOs. It is found from the water vapor budget analyses that an anomalous cyclone (anticyclone) dominates over the Indochina Peninsula in wet (dry) years, resulting in more (less) water vapor being transported to the RRD, whereas the anomalous convergence (divergence) of water vapor flux leads to the maintenance of excessive (insufficient) rainfall over the RRD. However, the El Niño–Southern Oscillation (ENSO) forcing shows minor effects on the interannual variation in rainfall in the RRD.

show abstract

The Second Rainy Stage Onset in the Central Highlands of Vietnam

Cited by 4 publications

References 24 publications

Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

Footprints of El Niño La Niña on the Particulate Matter evolution over Subtropical Island Taiwan

Factors affecting interannual variation in late summer rainfall in the Red River Delta of Vietnam

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