Vertical variations of rain intensity in different rainy periods in and around Bangladesh derived from TRMM observations

Islam, Nazrul; Uyeda, Hiroshi

doi:10.1002/joc.1585

Cited by 44 publications

(36 citation statements)

References 13 publications

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“…This confirms that during monsoons, shallow convection and northeastward or northwestward propagating STSs (especially SWACs) dominate. Houze et al (2007) and Islam and Uyeda (2008) also noted the shallow convection systems during the monsoon period in this region.…”

Section: Propagation Speed and Direction And Lifetime Of Systemsmentioning

confidence: 72%

“…It has been confirmed that deep convection and southeastward propagating ATSs are dominant in the premonsoon period. Islam and Uyeda (2008) and Kodama et al (2005) noted that deep convection systems prevail during the pre-monsoon period. The movement direction of monsoon systems toward the northeast or northwest is closely related to the seasonal average direction of low-level (850 hPa) wind (not shown).…”

Section: Propagation Speed and Direction And Lifetime Of Systemsmentioning

confidence: 99%

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Characteristics of monsoon precipitation systems in and around Bangladesh

Rafiuddin

Uyeda

Islam

2009

Intl Journal of Climatology

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Characteristics of precipitation systems in and around Bangladesh are analysed using 6 years of radar data from the Bangladesh Meteorological Department (BMD). Precipitation systems are classified as arc, line, or scattered types according to their shape; then as small, medium, or large according to their length; and as stationary, slow, or fast according to their propagation speed. Arc-, line-, and scattered-type systems are found 230 (29%), 117 (15%), and 442 (56%) times, respectively, from April to September during the analysis period (2000)(2001)(2002)(2003)(2004)(2005). These arc-, line-, and scattered-type systems have average speeds of 11.0, 7.1, and 5.8 m/s, horizontal lengths of 185, 184, and 268 km, and approximate lifetimes of 4.3, 4.0, and 4.8 h, respectively. Scattered-type systems dominate in the monsoon period (June, July, August, and September), while arc-type systems dominate in the pre-monsoon period (April and May). Line-type systems occur with nearly equal frequency in both periods. The monsoon systems are large and stationary or slow moving. In contrast, pre-monsoon systems are small and fast moving. Pre-monsoon systems propagate southeastward whereas monsoon systems propagate to the northeast, northwest, or southeast. A large number of systems occur in the southern, eastern, and northern parts of Bangladesh. Of the 442 scattered-type systems, 244 are scattered-type systems having wide areal coverage (SWAC), which extends out of radar range, and speeds too small to calculate. About 97% of SWACs develop during the monsoon period and contribute greatly to monsoon rainfall in this region.

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Section: Propagation Speed and Direction And Lifetime Of Systemsmentioning

confidence: 72%

Section: Propagation Speed and Direction And Lifetime Of Systemsmentioning

confidence: 99%

Characteristics of monsoon precipitation systems in and around Bangladesh

Rafiuddin

Uyeda

Islam

2009

Intl Journal of Climatology

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“…The 2A25 data with 5 km horizontal and 250 m vertical sampling from surface to 20 km altitude is used in this study. The spatial distribution and vertical variation of rain intensities are analyzed similar to Islam and Uyeda (2008) for all the Nor'westers over Bangladesh that occurred between 28th April and 31st May of 2008. Fig.…”

Section: Trmm Observationsmentioning

confidence: 99%

Composite characteristics of Nor'westers based on observations and simulations

Das

Sarkar

Das

et al. 2015

Atmospheric Research

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“…Over south Asia, precipitation characteristics change significantly with the seasons, with the dominance of deep convective precipitation during the pre-monsoon season, but the frequent occurrence of precipitation caused by stratiform and shallow convective clouds through the mature monsoon season (Kodama et al 2005;Islam and Uyeda 2008). Typically, there is also a well-defined diurnal variation in this region.…”

Section: Introductionmentioning

confidence: 99%

Effect of Spatial Resolution and Cumulus Parameterization on Simulated Precipitation over South Asia

Sugimoto

Takahashi

2016

SOLA

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This paper evaluates the ability of a regional-scale climate model to simulate precipitation over the South Asian tropical region. Experiments were conducted using three different spatial resolutions, with and without cumulus parameterization (CP), to assess the influence of horizontal mesh size and the CP on regional-scale precipitation. The experiments that used a finer mesh size but no CP improved the spatial distribution of monthly precipitation relative to that in the experiments based on a coarser spatial resolution. Meanwhile, the impact of horizontal mesh size was much less in the experiments that included the CP because an overestimation of precipitation caused by the CP strongly affected the simulation accuracy in these experiments. Regional differences in diurnal variations in precipitation intensity and frequency were captured reasonably well in the pre-monsoon season regardless of the spatial resolution, and both with and without the CP. In contrast, the diurnal characteristics of precipitation were difficult to simulate during the mature monsoon season. During both seasons, those experiments that incorporated the CP tended to predicted a continuous weak precipitation due to the excessive release of convective instability; accordingly, precipitation intensity was weaker, and precipitation frequency greater than in those experiments that did not use the CP.(Citation: Sugimoto, S., and H. G. Takahashi, 2016: Effect of spatial resolution and cumulus parameterization on simulated precipitation over South Asia. SOLA, 12A, 7−12,

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Vertical variations of rain intensity in different rainy periods in and around Bangladesh derived from TRMM observations

Cited by 44 publications

References 13 publications

Characteristics of monsoon precipitation systems in and around Bangladesh

Characteristics of monsoon precipitation systems in and around Bangladesh

Composite characteristics of Nor'westers based on observations and simulations

Effect of Spatial Resolution and Cumulus Parameterization on Simulated Precipitation over South Asia

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