Next Article in Journal
Impacts of Urban Development on Precipitation in the Tropical Maritime Climate of Puerto Rico
Next Article in Special Issue
Spatial-Temporal Variation and Prediction of Rainfall in Northeastern Nigeria
Previous Article in Journal
Understanding Climate Change on the California Coast: Accounting for Extreme Daily Events among Long-Term Trends
Climate 2014, 2(2), 28-46; doi:10.3390/cli2020028
Article

Spatial and Temporal Variability of Rainfall over the South-West Coast of Bangladesh

1,* , 2
 and 2
Received: 6 January 2014; in revised form: 27 February 2014 / Accepted: 26 March 2014 / Published: 22 April 2014
(This article belongs to the Special Issue Changes in precipitation and impacts on regional water resources)
View Full-Text   |   Download PDF [903 KB, uploaded 22 April 2014]   |   Browse Figures
Abstract: This study examined the spatial and temporal rainfall variability from the 1940s to 2007 in the south west coastal region of Bangladesh. Time series statistical tests were applied to examine the spatial and temporal trends in three time segments (1948–1970, 1971–1990 and 1991–2007) and four seasons (Pre-monsoon; Monsoon; Post-Monsoon and Winter), during the period 1948–2007. Eight weather stations were divided into two zones: exposed (exposed to sea) and interior (distant to sea). Overall, rainfall increased during the period 1948–2007, while the trends intensified during post-1990s. Post-monsoon and winter rainfall was observed to follow significant positive trends at most weather stations during the time period 1948–2007. The rate of change was found in exposed zone and interior zone are +12.51 and +4.86 mm/year, respectively, over post monsoon and +0.9 and +1.86 mm/year, respectively, over winter. These trends intensified both in the exposed zone (+45.81 mm/year) and the interior zone (+27.09 mm/year) 1990 onwards. Winter rainfall does not exhibit significant change (p > 0.1) over the exterior or interior zone, though individual stations like Jessore, Satkhira and Bhola show significant negative trends after 1990s. Although the trends were observed to weaken in the monsoon and pre-monsoon seasons, they are not significant. Moreover, an 11-year cyclicity was found within these two seasons, whilst no cyclicity was observed in the post-monsoon and winter seasons. Sequential Mann Kendal test reveals that the changes in two zones rainfall trends are started around mid-80s, where step change found only for fours season in Khulna stations and also for winter seasons in all weather stations. These changes may have a detrimental effect on rain-fed agriculture in Bangladesh. The application of palaeo-environmental techniques, threshold determination and rainfall analysis across the whole country could be useful to support adaptation planning of the rain-fed agro-economy in Bangladesh.
Keywords: rainfall trends; step change; rain-fed agriculture rainfall trends; step change; rain-fed agriculture
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Hossain, M.S.; Roy, K.; Datta, D.K. Spatial and Temporal Variability of Rainfall over the South-West Coast of Bangladesh. Climate 2014, 2, 28-46.

AMA Style

Hossain MS, Roy K, Datta DK. Spatial and Temporal Variability of Rainfall over the South-West Coast of Bangladesh. Climate. 2014; 2(2):28-46.

Chicago/Turabian Style

Hossain, Md. S.; Roy, Kushal; Datta, Dilip K. 2014. "Spatial and Temporal Variability of Rainfall over the South-West Coast of Bangladesh." Climate 2, no. 2: 28-46.


Climate EISSN 2225-1154 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert