The Impact of Trans-equatorial Monsoon Flow on the Formation of Repeated Torrential Rains over Java Island

Wu, Pei-Ming; Hara, Masayuki; Fudeyasu, Hironori; Yamanaka, Manabu D.; Matsumoto, Jun; Syamsudin, Fadli; Sulistyowati, Reni; Djajadihardja, Y.

doi:10.2151/sola.2007-024

Cited by 85 publications

(81 citation statements)

References 9 publications

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“…To summarize, a persistent transequatorial monsoonal flow from the Northern Hemisphere occurred in midJanuary prior to and during the extreme precipitation event of 2013 in Jakarta, similar to that reported by Wu et al (2007) as the main cause of the long duration of heavy precipitation that occurred in Jakarta during late January into early February 2007.…”

Section: Occurrence Of a Trans-equatorial Monsoonal Flow From The Norsupporting

confidence: 85%

“…The event ranked with the 1996, 2002, and 2007 flood events in Jakarta as one of the worst floods in recorded history. Wu et al (2007) reported, for the first time, an unusually long duration of heavy precipitation that occurred in Jakarta during late January into early February 2007. Later the case was investigated in detail with a numerical nonhydrostatic model (Trilaksono et al 2011;Trilaksono et al 2012).…”

Section: Introductionmentioning

confidence: 95%

“…3) showed that during 4−13 January, strong westerly winds > 10 m s −1 were observed from near the surface up to 400 hPa (~8 km), with maximum wind speed being at the 900600hPa layer, consistent with the passage of the strong active phase of the MJO over the Maritime Continent and the western Pacific regions. It is note worthy that the upper westerly winds continued over Java Island to a lower latitude and can even penetrate into the Southern Hemisphere (Wu et al 2007;Hattori et al 2011). A strong and persistent transequatorial monsoonal flow is a crucial factor in extremely heavy rain over western Java Island.…”

Section: Eastward Propagation Of An Active Phase Of the Mjo In Late Dmentioning

confidence: 99%

“…A strong and persistent transequatorial monsoonal flow is a crucial factor in extremely heavy rain over western Java Island. It was reported that a strong transequatorial monsoonal flow that causes extreme rain over Java Island is estimated to occur once every 5−10 years (Wu et al 2007). In this section, we examine the occurrence of the transequatorial monsoonal flow in January 2013.…”

Section: Eastward Propagation Of An Active Phase Of the Mjo In Late Dmentioning

confidence: 99%

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The Effects of an Active Phase of the Madden-Julian Oscillation on the Extreme Precipitation Event over Western Java Island in January 2013

Arbain

Mori

et al. 2013

SOLA

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An extreme precipitation/flood event that occurred in the Indo nesian capital of Jakarta on Java Island in the middle of January 2013 coincided with an active phase of the MaddenJulian Oscil lation (MJO) with the enhanced convective phase centered on the western Pacific. Analysis of upperair sounding data showed that strong to moderate upper westerly to northwesterly winds persist ed over the island prior to and during the heavy rain event, which were caused by the active phase of the MJO, while northwesterly winds occurred near the surface. Meteorological radar observa tions indicated regular genesis of convection at night over the sea to the northwest of the island, and southeastward propagation over the island from the nighttime to early morning. The movement of the precipitation systems was dominated by the upper north westerly winds. The results suggest that the eastward propagation of an active phase of the MJO exerted a strong influence on the formation of extreme heavy rain over western Java Island.

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Section: Occurrence Of a Trans-equatorial Monsoonal Flow From The Norsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 95%

Section: Eastward Propagation Of An Active Phase Of the Mjo In Late Dmentioning

confidence: 99%

Section: Eastward Propagation Of An Active Phase Of the Mjo In Late Dmentioning

confidence: 99%

See 2 more Smart Citations

The Effects of an Active Phase of the Madden-Julian Oscillation on the Extreme Precipitation Event over Western Java Island in January 2013

Arbain

Mori

et al. 2013

SOLA

Self Cite

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show abstract

“…Time-lagged ensemble simulations were performed to produce nine members at each output time, and all ensemble members are used in the following analyses. The analysis domain covers the western part of Java Island, Indonesia, and the experimental period includes a flooding event occurred in Jakarta in February 2007 (Wu et al 2007). …”

Section: Size Of Precipitation Areamentioning

confidence: 99%

Comparing Simulated Size Distributions of Precipitation Systems at Different Model Resolution

Otsuka

Trilaksono

Yoden

2017

SOLA

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Size distributions of tropical convective systems in regional numerical atmospheric models are analyzed over a 2.5 × 10 5 km 2 domain using different model grid spacing and parameterization schemes. The 5-and 20-km-resolution experiments are configured with a cumulus parameterization scheme, whereas the 2-and 4-km-resolution experiments are not. Precipitation systems are defined by either synthetic satellite infrared images, surface rain rates, or vertical winds at 600 hPa. The size distributions of systems defined by shallower clouds, lower rain rates, and weaker updrafts follow power laws, whereas those defined by deep clouds, higher rain rates, and stronger updrafts show lognormality. The cloud size distribution of the 5-km-resolution experiment is most similar to that of the real geostationary satellite observations. Generally, the largest system size becomes larger in the 5-and 20-km-resolution experiments, implying that the cumulus parameterization may have an impact on that scale. Exceptionally, all the model-simulated size distributions of heavy rain areas agree well at the largest scale. Lower-resolution experiments tend to underestimate the number of small-scale systems when compared with higher-resolution experiments. The size distributions also capture a temporal modulation of precipitation during the 2007 Jakarta flood event; small-scale intense precipitation systems increase during the period.(Citation: Otsuka, S., N. J. Trilaksono, and S. Yoden, 2017: Comparing simulated size distributions of precipitation systems at different model resolution. SOLA, 13, 130−134,

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Role of updraft in dry‐season torrential rainfall in Greater Jakarta, Indonesia

Handayani

Permana

Isoda

2023

Atmospheric Science Letters

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Coastal urban areas in tropical regions, such as Greater Jakarta (GJ) in Indonesia, are susceptible to flood hazards from torrential rainfall. Efforts to understand the convective mechanisms leading to this type of rainfall have been carried out extensively, especially for events occurring in the wet season. However, hydrometeorological risks persist even in the dry season, when the rainfall is more closely correlated with the diurnal wind circulation. Among the aspects of convective activities and this diurnal circulation, the details of the updraft remain the least studied and open for discussion. We investigate the role of the updraft in urban torrential rainfall over GJ, using data from a C‐band Doppler radar and reanalysis dataset during the dry season of 2018–2019. Employing back‐trajectory calculations, we locate updraft origins corresponding to the peak of daytime inland rainfall. Most updraft origins are localized at an NW–SE‐oriented front nearly parallel to the coastline on the low‐lying plain, suggesting a region of atmospheric destabilization favorable for convective activity. The dry‐season torrential rainfall over GJ may involve convective activity from this front, that from earlier updrafts originating above the densely populated area, and further enhancement coming from orographic contributions. Our findings suggest the important role of updrafts in the rainfall generation, providing insights into the convective mechanism over GJ.

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The Impact of Trans-equatorial Monsoon Flow on the Formation of Repeated Torrential Rains over Java Island

Cited by 85 publications

References 9 publications

The Effects of an Active Phase of the Madden-Julian Oscillation on the Extreme Precipitation Event over Western Java Island in January 2013

The Effects of an Active Phase of the Madden-Julian Oscillation on the Extreme Precipitation Event over Western Java Island in January 2013

Comparing Simulated Size Distributions of Precipitation Systems at Different Model Resolution

Role of updraft in dry‐season torrential rainfall in Greater Jakarta, Indonesia

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