Meteorological drought in Bangladesh: assessing, analysing and hazard mapping using SPI, GIS and monthly rainfall data

Rahman, Md. Rejaur; Lateh, Habibah

doi:10.1007/s12665-016-5829-5

Cited by 93 publications

(44 citation statements)

References 41 publications

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“…For the detection of trends in tree growth-climate associations over time, we used a simple linear regression analysis. According to previous analyses, climate change (temperature rise, frequency of drought) in Bangladesh was most severe in the last three decades (1986-2015) [44,81] (Figure 3). Therefore, we separated this period (1986-2015) from the rest of the available climate data to compare the climate-growth relationships between these two periods and to test how trees' responses to climate has been affected by recent climate trends.…”

Section: Data Analysesmentioning

confidence: 99%

“…Regional temperature increased by 1.19 • C over the last 66 years, which is higher than the global mean over 1880-2012 (0.85 • C) [41]. The increasing trends in temperatures [42,43] and severity of droughts in many parts of Bangladesh and adjacent areas in monsoon Southeast Asia [44,45] may have negative effects on tree growth and forest productivity. Higher temperatures reduced tree growth in three functionally different tree species in Bangladesh [46].…”

Section: Introductionmentioning

confidence: 99%

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Changes in Sensitivity of Tree-Ring Widths to Climate in a Tropical Moist Forest Tree in Bangladesh

Rahman

Islam

Wernicke

et al. 2018

Forests

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Tree growth in the tropics is strongly influenced by climate. However, reported tree growth responses to climate are largely inconsistent, varying with geographic location, forest type, and tree species. It is thus important to study the growth responses of tropical trees in sites and species that are under-represented so far. Bangladesh, a country influenced by the Asian monsoon climate, is understudied in terms of tree growth response to climate. In the present study, we developed a 121-year-long regional ring-width index chronology of Chukrasia tabularis A. Juss. sampled in two moist forest sites in Bangladesh to investigate tree growth responses to climate in monsoon South Asia. Standard dendrochronological methods were used to produce the ring-width chronologies. The climate sensitivity of C. tabularis was assessed through bootstrap correlation analysis and the stationarity and consistency of climate–growth relationships was evaluated using moving correlation functions and comparing the regression slopes of two sub-periods (1950–1985 and 1986–2015). Tree growth was negatively correlated with the mean, minimum, and maximum temperatures, particularly during the early growing season (March). Likewise, precipitation negatively influenced tree growth in the later growing season (October). Besides, radial growth of Chukrasia sharply ceased in years following strong and moderate El Niño events. In parallel with a significant positive trend in local temperatures, tree growth sensitivity to early growing season (March–April) mean temperatures and July minimum temperatures increased in recent decades. Tree growth sensitivity to October precipitation and April vapor pressure deficit also increased. Overall, climate–growth relationships were stronger during the period 1986–2015 than during 1950–1985. Changes in climate sensitivity might be linked to a warming trend that induced an increase in the dry season length during recent decades. With a further predicted temperature increase at our study sites, our results suggest that radial growth of C. tabularis will further decline in response to climate warming.

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Section: Data Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes in Sensitivity of Tree-Ring Widths to Climate in a Tropical Moist Forest Tree in Bangladesh

Rahman

Islam

Wernicke

et al. 2018

Forests

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“…In fact, ET a can act as a reliable measure of drought (Kim and Kaluarachchi 2019). Rahman and Lateh (2016) analyzed droughts in the period of 1971-2010 and pointed that the following calendar years were drought-affected in many districts of the lower end of the Ganges Delta: 1975-1979, 1981, 1982, 1985, 1989, 1990, 1994, 1995, 1997, 2004, 2006-2010. Among them, 1999and 2006, were the extremes (Figures 10 and 11).…”

Section: Journal Of the American Water Resources Associationmentioning

confidence: 99%

Changes in Hydrology of the Ganges Delta of Bangladesh and Corresponding Impacts on Water Resources

Murshed

Rahman

Kaluarachchi

2019

J American Water Resour Assoc

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The Ganges Delta in Bangladesh is an example of water‐related catastrophes in a major rural river basin where limitations in quantity, quality, and timing of available water are producing disastrous conditions. Water availability limitations are modifying the hydrologic characteristics especially when water allocation is controlled from the upstream Farakka Barrage. This study presents the changes and consequences in the hydrologic regime due to climate‐ and human‐induced stresses. Flow duration curves (FDCs), rainfall elasticity, and temperature sensitivity were used to assess the pre‐ and post‐barrage water flow patterns. Hydrologic and climate indices were computed to provide insight on hydro‐climatic variability and trend. Significant increases in temperature, evapotranspiration, hot days, heating, and cooling degree days indicate the region is heading toward a warmer climate. Moreover, increase in high‐intensity rainfall of short duration is making the region prone to extreme floods. FDCs depict a large reduction in river flows between pre‐ and post‐barrage periods, resulting in lower water storage capacity. The reduction in freshwater flow increased the extent and intensity of salinity intrusion. This freshwater scarcity is reducing livelihood options considerably and indirectly forcing population migration from the delta region. Understanding the causes and directions of hydrologic changes is essential to formulate improve water resources management in the region.

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“…Hossian et al (2016) fits several types of probability distributions for the climate parameter of monthly-maximum-temperature of Dhaka, Bangladesh and found the generalized skew logistic distribution as the best-fitted one. Rahman and Lateh (2016) have been focused on assessing and analyzing meteorological drought characteristics of Bangladesh based on rainfall, standardized precipitation index and geographic information system for the period of 1971-2010. The empirical distribution pattern and hierarchical clustering technique are used to find homogeneous region based on precipitation of different region in Bangladesh (Rahman et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Fitting of Probability Distribution on the Post-Monsoon Rainfall of Different Locations in Bangladesh

Rahman¹

2019

ENRR

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Different probability distributions of post-monsoon rainfall of different locations in Bangladesh are fitted. It is found that, for the data, Weibull distribution for Barisal, Bogra, Chittagong, Comilla, Cox's Bazar, Faridpur, Jessore, Khulna, Maijdi Court, Mymensingh, Satkhira, and Sylhet; the Gamma distribution for Dhaka, Ishurdi, Rangamati, Rangpur, and Srimangal based on graphical assessment and goodness-of-fit criterion. In this study, different probability distributions have been fitted for the data of post-monsoon precipitation for 17 different locations in Bangladesh over the period 1961-2014.

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Meteorological drought in Bangladesh: assessing, analysing and hazard mapping using SPI, GIS and monthly rainfall data

Cited by 93 publications

References 41 publications

Changes in Sensitivity of Tree-Ring Widths to Climate in a Tropical Moist Forest Tree in Bangladesh

Changes in Sensitivity of Tree-Ring Widths to Climate in a Tropical Moist Forest Tree in Bangladesh

Changes in Hydrology of the Ganges Delta of Bangladesh and Corresponding Impacts on Water Resources

Fitting of Probability Distribution on the Post-Monsoon Rainfall of Different Locations in Bangladesh

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