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

Murata, Fumie; Terao, Toru; Kiguchi, Masashi; Fukushima, Azusa; Takahashi, Koji; Hayashi, Taiichi; Habib, Arjumand; Bhuiyan, Shameem Hassan; Choudhury, Sayeed Ahmed

doi:10.2151/jmsj.2011-a11

Cited by 13 publications

(9 citation statements)

References 19 publications

(17 reference statements)

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“…Yamane and Hayashi (2006) and Yamane et al (2010a) further found that these severe local convective storms mainly occurred from central to northern Bangladesh. In this season, pronounced southwesterlies prevailed at low level over the Bay of Bengal (Minoura et al, 2003;Murata et al, 2011), which enhanced moisture inflow originating from the Bay (Yamane et al, 2013). Accordingly, high thermal instabilities due to increasing temperature and water vapor amounts in the lower layer resulted in a great potential for storms (Yamane et al, 2010b;Yamane et al, 2013;Yamane & Hayashi, 2006).…”

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 99%

Ground‐Based Observations Reveal Unique Valley Precipitation Patterns in the Central Himalaya

Ouyang

Yang

et al. 2020

JGR Atmospheres

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While the Himalayas act as a natural barrier to water vapor transport to the Tibetan Plateau, many north‐south‐oriented valleys channel moisture onto the Plateau. However, owing to the lack of in situ data, the spatiotemporal characteristics of precipitation remain unclear along these valleys. In this study, a high‐altitude (2,800–4,500 m above mean sea level) rain‐gauge network was established in the Yadong Valley, one of the main valleys in the central Himalayan Region (CHR). New observations from this network are used to evaluate the Integrated Multi‐satellitE Retrieval for Global Precipitation Measurement (IMERG) precipitation product, with results demonstrating that the IMERG data can reproduce the seasonal and diurnal patterns of precipitation seen in the observational data. This combination of in situ and IMERG precipitation data reveals two unique characteristics in the CHR. First, precipitation during the premonsoon season (March‐May) contributes 20–40% of the annual total, from the high altitudes of the CHR to Southeast Tibetan Plateau, due to water vapor flux conveyed by southwesterlies from the Bay of Bengal, whereas this percentage is much lower in the northern Himalaya and South Asia. Second, diurnal variations in precipitation during the monsoon season (June‐September) vary between the low and high altitudes of the north‐south‐oriented valleys in the CHR: Precipitation at high altitudes has two peaks (one in the afternoon and the other at night), which is different from the single nighttime peak in low altitudes that is usually reported. These two notable spatiotemporal characteristics are indicative of the unique climate that exists at the high altitudes of the CHR.

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Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 99%

Ground‐Based Observations Reveal Unique Valley Precipitation Patterns in the Central Himalaya

Ouyang

Yang

et al. 2020

JGR Atmospheres

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“…This rainfall displays a late night/early morning convective maximum, which occurs during spring and summer, and seems to account for over two-thirds of total rainfall (Ohsawa et al 2001). The triggering mechanisms could be orographic lifting (Matsumoto 1997), large-scale moist f low convergence with katabatic winds (Ohsawa et al 2001;Basu 2007), cold pool convergence (Murata et al 2011), or dryline convection (Weston 1972;Lefort 2013). The convection could deepen by interacting with the midtropospheric India-Myanmar trough, previously known as the Burma trough (Flohn 1968;Yin 1949;Ding and Sikka 2006).…”

Section: Early Onset In Sylhetmentioning

confidence: 99%

Complementing Scientific Monsoon Definitions with Social Perception in Bangladesh

Stiller-Reeve

Syed

Spengler

et al. 2015

Bulletin of the American Meteorological Society

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The monsoon onset is a critical event in the Bangladesh calendar, especially for the domestic agricultural sector. Providing information about the monsoon onset for the past, present, and future has potential benefit for a country so vulnerable to changes in climate. But, when does the monsoon start? To produce any scientific information about monsoon onsets, lengths, and withdrawals, we first need to apply a monsoon definition to our data. Choosing a scientific definition is not such a simple exercise in Bangladesh. Different definitions lead to different monsoon onsets and thereby also monsoon lengths. If a climate application aims to provide information about the monsoon onset, then we need to understand how the people who might use this information perceive the monsoon onset. We then need to understand how their perceptions compare with previous scientific work. In this study we carried out a structured questionnaire in six rural regions around Bangladesh and asked the local agriculturists how they defined the monsoon and when they thought it started. It turns out that the agriculturists and previous scientific publications do not necessarily agree. Our results do not undermine previous scientific work on the monsoon in Bangladesh, but they do carry an important message about how we should design, implement, and evaluate climate applications in Bangladesh that encompass the monsoon onset.

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“…The Mann-Kendall test showed significant linkage between temperature and rainfall in Pre-Monsoon and Winter seasons, which is substantiated by the studies in [3,46,49,50]. The southeastern region, which is one the most important forest ecosystem zone in the country is experiencing early onset and withdrawal of rain, yet increasing trends in total rainfall except in the Monsoon season [30].…”

Section: Discussionmentioning

confidence: 71%

Geospatial Modeling for Investigating Spatial Pattern and Change Trend of Temperature and Rainfall

Syed

Amin

2016

Climate

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Bangladesh has been experiencing increased temperature and change in precipitation regime, which might adversely affect the important ecosystems in the country differentially. The river flows and groundwater recharge over space and time are determined by changes in temperature, evaporation and crucially precipitation. These again have a spatio-temporal dimension. This geospatial modeling research aimed at investigating spatial patterns and changing trends of temperature and rainfall within the geographical boundary of Bangladesh. This would facilitate better understanding the change pattern and their probable impacts on the ecosystem. The southeastern region, which is one of the most important forest ecosystem zones in the country, is experiencing early onset and withdrawal of rain but increasing trends in total rainfall except in the Monsoon season. This means that the region is experiencing a lower number of rainy days. However, total rainfall has not changed significantly. The differential between maximum and minimum showed an increasing trend. This changing pattern in average max and min temperature along with precipitation might cause a situation in which the species that are growing now may shift to suitable habitats elsewhere in the future. Consequently, the biodiversity, watersheds and fisheries, productivity of land, agriculture and food security in the region will be affected by these observed changes in climate.

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

Cited by 13 publications

References 19 publications

Ground‐Based Observations Reveal Unique Valley Precipitation Patterns in the Central Himalaya

Ground‐Based Observations Reveal Unique Valley Precipitation Patterns in the Central Himalaya

Complementing Scientific Monsoon Definitions with Social Perception in Bangladesh

Geospatial Modeling for Investigating Spatial Pattern and Change Trend of Temperature and Rainfall

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