Evaluation of the TRMM Product for Spatio-temporal Characteristics of Precipitation over Nepal (1998-2018)

  • Kalpana Hamal International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, University of Chinese Academy of Sciences, Beijing
  • Nitesh Khadka University of Chinese Academy of Sciences, Beijing, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu
  • Samresh Rai Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing
  • Bharat Badayar Joshi Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, Kathmandu Centre for Research and Education, Chinese Academy of Sciences-Tribhuvan University, Kirtipur
  • Jagdish Dotel Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur
  • Lilaram Khadka Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur
  • Niraj Bag Golden Gate International College, Kathmandu
  • Shravan Kumar Ghimire University of Chinese Academy of Sciences, Beijing, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu
  • Dibas Shrestha Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur
Keywords: Nepal, Precipitation, Satellite-based dataset, Spatial pattern, TRMM

Abstract

Precipitation is a fundamental component of the water cycle and integral to the society and the ecosystem. Further, continuous monitoring of precipitation is essential for predicting severe weather, monitoring droughts, and high-intensity related extremes. The present study evaluated the spatio-temporal distribution of precipitation and trends between 1998– 2018 using Tropical Rainfall Measuring Mission (TRMM) (3B43-V7) with reference to 142-gauge observations over Nepal. TRMM moderately captured precipitation patterns' overall characteristics, although underestimated the mean annual precipitation during the study period. TRMM precipitation product well captured the seasonal variation of the observed precipitation with the highest correlation in the winter season. The decreasing seasonal and annual trend was found in both observed and TRMM products, with the highest (lowest) decreasing trend observed during the monsoon (winter) season. It was also noted that the TRMM product showed a smaller bias before 2007, while a large error was found after 2007, especially in the monsoon months. In general, the TRMM product is a good alternative to observe rain gauge measurement in Nepal. However, there is still space for further improvement in rainfall retrieval algorithms, especially in high-elevation areas during the winter season.

Downloads

Download data is not yet available.
Abstract
174
pdf
86
Published
2020-12-25
How to Cite
Hamal, K., Khadka, N., Rai, S., Joshi, B., Dotel, J., Khadka, L., Bag, N., Ghimire, S., & Shrestha, D. (2020). Evaluation of the TRMM Product for Spatio-temporal Characteristics of Precipitation over Nepal (1998-2018). Journal of Institute of Science and Technology, 25(2), 39-48. https://doi.org/10.3126/jist.v25i2.33733
Section
Research Article