Characteristic intraseasonal oscillation of rainfall and its effect on interannual variability over Bangladesh during boreal summer

Fujinami, Hatsuki; Hatsuzuka, Daisuke; Yasunari, Tetsuzo; Hayashi, Taiichi; Terao, Toru; Murata, Fumie; Kiguchi, Masashi; Yamane, Yusuke; Matsumoto, Jun; Islam, Nazrul; Habib, Arjumand

doi:10.1002/joc.2146

Cited by 48 publications

(51 citation statements)

References 42 publications

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“…southeasterly prevailed in the break periods. The enhancement of the westerly component in the lower troposphere over the Bengal Plain is associated with the active monsoon rainfall because of the northward migration of the monsoon trough, as confirmed by Murata et al (2008) and Fujinami et al (2011). Thus, the suppression of WNPM activated the NEIM rainfall associated with the acceleration of the westerly over the Bengal Plain only in August.…”

Section: Impacts Of Wnpm Variability On Neim Rainfallmentioning

confidence: 74%

“…It causes a significant westerly anomaly only in August over the Bengal Plain (Fig. 12), which is a known favorable condition for the active phase of rainfall in Bangladesh and Meghalaya (Ohsawa et al 2000;Murata et al 2008;Fujinami et al 2011). The link between the first and second steps was highly affected by the variability at intraseasonal time scales (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…2), was rather large in terms of the impact of dNINO3.4 on WNPM. Fujinami et al (2011) also suggested that the Bangladesh rainfall has no correlation with NINO3 in JJA. The difference in the conclusion between Fujinami et al (2011) and the present study was due to the difference in the season they focused on.…”

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confidence: 99%

“…Fujinami et al (2011) also suggested that the Bangladesh rainfall has no correlation with NINO3 in JJA. The difference in the conclusion between Fujinami et al (2011) and the present study was due to the difference in the season they focused on. Fujinami et al (2011) analyzed the simultaneous correlation with the ENSO system.…”

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confidence: 99%

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Impacts of Rapid Warm-To-Cold ENSO Transitions on Summer Monsoon Rainfall over the Northeastern Indian Subcontinent

Terao

Murata

Habib³

et al. 2013

Journal of the Meteorological Society of Japan

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In this study, the impacts of warm-to-cold El Niño-Southern Oscillation (ENSO) phase transitions on the summer rainfall over the northeastern Indian monsoon (NEIM) region were investigated. Extremely rapid warm-to-cold ENSO transitions were identified in 1983, 1988, and 1998. In these rapid ENSO transition years, during August, the NEIM rainfall tended to be higher than that in other years, leading to large river water discharge into Bangladesh in August and September through the Ganges and Brahmaputra. In summer (June, July, and August), the western North Pacific monsoon (WNPM) was significantly suppressed in association with the east-west sea surface temperature (SST) anomaly contrast between an above-normal SST over the Indian Ocean and a negative SST anomaly that developed over the central equatorial Pacific. The suppression of WNPM was highly likely to be a key factor linking rapid ENSO transition to the heavy NEIM rainfall in August. WNPM suppression caused a prominent lower tropospheric anticyclonic anomaly, which extended westward over the Indian Ocean and Indian subcontinent. Associated with this circulation anomaly, a lower tropospheric westerly anomaly developed over the Bengal Plain in August, which activated the NEIM rainfall. Thus, especially in August, WNPM suppression significantly correlated with heavy rainfall over a large area over the northeastern Indian subcontinent.In all three rapid warm-to-cold ENSO transition years, WNPM was extremely suppressed in summer. However, in the August of 1983, owing to atmospheric variations at intraseasonal time scales, WNPM suppression was damped, and both the lower tropospheric circulation anomaly and the NEIM rainfall activation were not clear. On the other hand, in 1988 and 1998, WNPM suppression enhanced the NEIM rainfall in August and increased flood risk in Bangladesh.

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Section: Impacts Of Wnpm Variability On Neim Rainfallmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Impacts of Rapid Warm-To-Cold ENSO Transitions on Summer Monsoon Rainfall over the Northeastern Indian Subcontinent

Terao

Murata

Habib³

et al. 2013

Journal of the Meteorological Society of Japan

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“…During the summer monsoon season (JuneSeptember), much of the precipitation was brought by the monsoon low (pressure system) originated from the Bay of Bengal and moved along the Ganges. Precipitation in Bangladesh shows clear intraseasonal variation with time scales of 7−25 days during the monsoon season (Fujinami et al 2011;Hatsuzuka et al 2014). Precipitation caused by severe local convective storms is predominant in the pre-monsoon (March-May) season (Rafiuddin et al 2010;Yamane et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Trends in Precipitation Characteristics in Bangladesh from 1950 to 2008

Endo

Matsumoto

Hayashi

et al. 2015

SOLA

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We analyzed trends in precipitation characteristics at 12 weather stations in Bangladesh using data from 1950 to 2008 and a non-parametric Mann-Kendall's tau test. It was found that the annual precipitation amount and the number of wet days tended to increase at almost all the stations. The number of days with weak precipitation (< 3 mm) showed increasing tendency; the number of days with daily precipitation exceeding 10 mm increased at three stations; and the number of days with daily precipitation exceeding 20 mm increased at two stations. Heavy rainfall index showed no clear trend, and was dominated by inter-annual and/or decadal variations. During the pre-monsoon season, seasonal precipitation amount and the number of wet days increased, and the number of days with weak precipitation (< 3 mm) also increased. Changes in the monsoon and post-monsoon seasons were insignificant.

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Seasonal transition of precipitation characteristics associated with land surface conditions in and around Bangladesh

Ono

Takahashi

2016

JGR Atmospheres

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This study examined the seasonal transition of precipitation characteristics and its association with land surface conditions in and around Bangladesh, where land surface conditions are predominantly wet. Hourly rain rate data from the Global Satellite Mapping of Precipitation Microwave‐Infrared Combined Product and 10 day soil moisture data from the Advanced Microwave Scanning Radiometer Earth Observing System were used over the 7 years from 2003 to 2009. Area mean values of soil moisture, and precipitation amount, frequency, and intensity were calculated for each 10 day period. Results showed that higher precipitation amount and frequency were observed over the wet soil conditions, which indicates that soil moisture was influenced by previous precipitation events. However, the soil moisture could also control the precipitation characteristics. The seasonal and interannual variations in all regions suggested that precipitation amount and frequency increased in moist soil conditions, which is associated with an increase of water vapor supplied from the moist land surface. Over a flat plain (87°E–91°E, 23°N–25°N), a higher afternoon precipitation intensity was observed over drier land surfaces. This relationship was observed on seasonal and interannual variations. This suggests that the land surface conditions in this region can affect the afternoon precipitation intensity to some extent, although changes of atmospheric conditions can be a major factor particularly for the seasonal changes. However, this relationship was not observed in mountainous regions. This can be explained by other factors, such as thermally induced local circulations by the surrounding topography, being stronger than the impact of land surface conditions.

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Characteristic intraseasonal oscillation of rainfall and its effect on interannual variability over Bangladesh during boreal summer

Cited by 48 publications

References 42 publications

Impacts of Rapid Warm-To-Cold ENSO Transitions on Summer Monsoon Rainfall over the Northeastern Indian Subcontinent

Impacts of Rapid Warm-To-Cold ENSO Transitions on Summer Monsoon Rainfall over the Northeastern Indian Subcontinent

Trends in Precipitation Characteristics in Bangladesh from 1950 to 2008

Seasonal transition of precipitation characteristics associated with land surface conditions in and around Bangladesh

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