5 years ago

Effects of temporal scales and space mismatches on the TRMM 3B42 v7 precipitation product in a remote mountainous area

Yinsheng Zhang, Ning Ma, Cheng Chen, Qammerul Zaman, Qiuwen Chen, Shiva Ebrahimi
The accurate measurement ofprecipitation is essential to understanding regional hydrological processes and hydrological cycling.Quantification of precipitation over remote regions such as the Tibetan plateau (TP) is highly unreliable because of thescarcity of rain gauges.The objective of this study is to evaluate the performance of the satellite precipitation product of Tropical Rainfall Measuring Mission (TRMM) 3B42 v7 at daily, weekly, monthly and seasonalscales. Comparison between TRMM grid precipitation and point-based rain gauge precipitation was conducted using nearest neighbor (NN) and bilinear weighted interpolation (BWI) methods. The results showed that the TRMM product could not capture daily precipitation well due to some rainfall events being missed at short time scalesbut provided reasonably good precipitation data at weekly, monthly and seasonal scales. TRMM tended to underestimate the precipitation of small rainfallevents (less than 1 mm/day), while it overestimated the precipitation of large rainfall events (greater than 20 mm/day). Consequently, TRMM showedbetter performance in the summer monsoon season than in the winter season.Through comparison, it was also found that the bilinear weighted interpolation method performs better than the nearest neighbor method in TRMM precipitation extraction.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/hyp.11357

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