Assessment of TRMM data for precipitation measurement in Bangladesh

被引:24
作者
Tarek, Mehedi Hasan [1 ]
Hassan, Adil [1 ]
Bhattacharjee, Joy [1 ]
Choudhury, Sayedul Hasan [1 ]
Badruzzaman, Abu Borhan Md [2 ]
机构
[1] Streams Tech Inc, 4031 Univ Dr,Suite 100, Fairfax, VA 22030 USA
[2] Bangladesh Univ Engn & Technol, Dept Civil Engn, Dhaka, Bangladesh
关键词
TRMM; rainfall; Bangladesh; spatial distribution; temporal distribution; MEASURING MISSION TRMM; RAINFALL;
D O I
10.1002/met.1633
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Application of the Tropical Rainfall Measuring Mission (TRMM) can be an efficient method for precipitation measurement in Bangladesh. The TRMM was a joint US-Japan space programme used to measure tropical rainfall with spatial and temporal distribution. This study analyses the reliability of TRMM data by comparing them with the rain gauge data of Bangladesh Meteorological Department at 35 different locations. The comparison is made for the data from 1998 to 2010. Extensive analyses were performed on the basis of different temporal scales (daily, monthly, seasonal and yearly). Both datasets were compared for average, peak and total values. The correlation co-efficient and bias of TRMM rainfall data with respect to rain gauge values were also determined. However, the rainfall products are also compared at the two most extreme elevation stations to observe the influence of station topography (if any). Results show that TRMM rainfall data closely match with rain gauge data for average values on an annual basis, and the correlation co-efficient is found to be greater than 0.90. However, significant deviation is found for daily peak rainfall values. Again, a seasonal comparison shows that the TRMM data outputs match with station data except during the dry season. The rainfall data at the highest and lowest elevations show that the TRMM data follow a similar trend to the station data but they underestimate the value to some extent, especially during the wet season. Finally, it is inferred that the TRMM data are reliable in estimating the average rainfall in Bangladesh for hydrological analyses of watersheds.
引用
收藏
页码:349 / 359
页数:11
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