Rainfall Variability Over Bangladesh and Nepal: Comparison and Connections With Features Over India

Kripalani, R. H.; Inamdar, S. R.; Sontakke, N. A.

doi:10.1002/(sici)1097-0088(199606)16:6<689::aid-joc36>3.0.co;2-k

Cited by 80 publications

(55 citation statements)

References 3 publications

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“…Increasing trend in total precipitation in the monsoon season was observed at eight stations. These increasing trends are consistent with the results of Kripalani et al (1996) and Shahid (2010). R03mm shows increasing tendency at seven stations, but statistically significant increasing trend was observed only at three stations.…”

Section: Indexsupporting

confidence: 92%

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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Section: Indexsupporting

confidence: 92%

Trends in Precipitation Characteristics in Bangladesh from 1950 to 2008

Endo

Matsumoto

Hayashi

et al. 2015

SOLA

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“…After it arrives over the Head Bay of Bengal and north India, the positive correlation area tends to move gradually northward rather than westward. Krishnamurti and Ardanuy [1980] and Chen and Chen [1993] showed that the so-called 10-to 20-day mode exhibits a westward component over the South and Southeast Asian monsoon region. Moreover, M. and Yasunari [1979] showed that the 10-to 20-day mode tends to move northwestward through the Bay of Bengal to India and turn to the east when it reaches to the Tibet-Himalayan region.…”

Section: Periodicity Of Monsoon Activitiesmentioning

confidence: 99%

Intraseasonal variation of monsoon activities associated with the rainfall over Bangladesh during the 1995 summer monsoon season

Ohsawa¹,

Hayashi²,

Mitsuta³

et al. 2000

J. Geophys. Res.

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Abstract. The rainfall over Bangladesh during the 1995 summer monsoon season has been investigated in terms of the intraseasonal variation of monsoon activities. The rainfall over Bangladesh is basically dominated by the north-south oscillation of the monsoon trough. The rainfall increases when the monsoon trough is located at the foot of the Himalayas, because synoptic-scale convective activity is much more vigorous to the south of the monsoon trough axis than to the north of it. In addition, the strong southwesterly wind to the south of the monsoon trough intensifies local convective activity owing to the effects of the orography to the north and east of the country. It is also found that the monsoon rainfall over Bangladesh in 1995 varies with a periodicity of -20 days, and this rainfall variation is closely associated with synoptic-scale monsoon activities spreading over South and Southeast Asia. The active/break cycle of the rainfall variation during the 1995 summer monsoon season can be mostly explained by the northward propagation of what is called the 10-20 day variation of monsoon activities.

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“…The rainfall variability has a prominent nocturnal peak (Ohsawa et al 2001), and Kataoka and Satomura (2005) simulated the nocturnal rainfall in this area. While most of the studies for the rainfall variability are concentrated on the monsoon season, the heavy rainfall in this area begins in the premonsoon season (Kripalani et al 1996;Pant and Kumar 1997). Recently Terao et al (2008Terao et al ( , 2009 showed that the nocturnal rainfall in this area was also dominant in the pre-monsoon season.…”

Section: Introductionmentioning

confidence: 99%

Daytime Thermodynamic and Airflow Structures over Northeast Bangladesh during the Pre-Monsoon Season: A Case Study on 25 April 2010

Murata

Terao

Kiguchi

et al. 2011

Journal of the Meteorological Society of Japan

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Simultaneous intensive radiosonde observation at three stations over northeast (Sylhet), central (Dhaka), and northwest (Bogra) Bangladesh was analyzed to describe a three-dimensional thermodynamic and airflow structures on 25 April 2010, in which a distinct nocturnal rainfall occurred at Sylhet. As the observation was conducted in the daytime, the observed structures represent convectively inactive condition in a diurnal cycle. Local circulation was unclear and larger-scale airflow was dominated over Sylhet. The radiosonde observation indicated strong subsidence within 1-5 km over Dhaka and Bogra and within 4-5 km over Sylhet, whereas topographic uplifting of southwesterly airflow was observed within 1-3 km over Sylhet. Temperature profiles of Sylhet up to 3 km were lower than that of other stations, and easterly wind was observed at the surface.

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Rainfall Variability Over Bangladesh and Nepal: Comparison and Connections With Features Over India

Cited by 80 publications

References 3 publications

Trends in Precipitation Characteristics in Bangladesh from 1950 to 2008

Trends in Precipitation Characteristics in Bangladesh from 1950 to 2008

Intraseasonal variation of monsoon activities associated with the rainfall over Bangladesh during the 1995 summer monsoon season

Daytime Thermodynamic and Airflow Structures over Northeast Bangladesh during the Pre-Monsoon Season: A Case Study on 25 April 2010

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