TITLE:
Trending Regional Precipitation Distribution and Intensity: Use of Climatic Indices
AUTHORS:
Syeed Md Iskander, Mohammad Adnan Rajib, Md Mujibur Rahman
KEYWORDS:
Bangladesh, Climate Change Indices, Precipitation, PCI, SDII
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.4 No.3,
July
16,
2014
ABSTRACT: Trends and variability of
annual precipitation total, annual number of rainy days and two climate change
related precipitation indices named Simple Daily Intensity Index (SDII) and
Precipitation Concentration Index (PCI) have been investigated in this study.
The analysis was based on daily and monthly precipitation data of 35
observatory stations all over Bangladesh for the study period of 1971-2010.
Mann Kendall test was performed to detect the trend and Sen’s slope method to determine
the magnitude of change. The results indicate statistically significant (95%
confidence level) negative trend in 4 stations and significant positive trend
in 2 stations for annual precipitation total. Significant positive trend in 9
stations for annual number of rainy days, significant negative trend in 6
stations for SDII and for PCI, and significant negative trend in 6 stations
were found all over Bangladesh in this study. The values of PCI indicate
strongly irregular precipitation distribution in South Eastern Region (SER) and
mostly irregular distribution in other regions. On the other hand values of
SDII indicate strong precipitation intensity in SER and mostly moderate
intensity in other regions all over the country.