EGU2020-2784
https://doi.org/10.5194/egusphere-egu2020-2784
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Spatial and Temporal Analysis of Precipitation Extremities of Eastern Nepal in the Last Two Decades (1997–2016)

Sunil Subba1,2, Yaoming Ma1,2,3, and Weiqiang Ma1,2,3
Sunil Subba et al.
  • 1Institute of Tibetan Plateau Research, Atmospheric Physics and Atmospheric Environment, Beijing, China (sunilsubba@itpcas.ac.cn)
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences
  • 3CAS Center for Excellence in Tibetan Plateau Earth Sciences, CAS,

In recent days there have been discussions regarding the impact of climate change and its vagaries of the weather, particularly concerning extreme events. Nepal, being a mountainous country, is more susceptible to precipitation extreme events and related hazards, which hinder the socioeconomic
development of the nation. In this regard, this study aimed to address this phenomenon for one of the most naturally and socioeconomically important regions of Nepal, namely, Eastern Nepal. The data were collected for the period of 1997 to 2016. The interdecadal comparison for two periods
(1997–2006 and 2007–2016) was maintained for the calculation of extreme precipitation indices as per recommended by Expert Team on Climate Change Detection and Indices. Linear trends were calculated by using Mann‐Kendall and Sen's Slope estimator. The average annual precipitation was found to be decreasing at an alarming rate of −20 mm/year in the last two decades' tenure. In case of extreme precipitation events, consecutive dry days, one of the frequency indices, showed a solo increase in its trend (mostly significant). Meanwhile, all the intensity indices of extreme precipitation showed decreasing trends (mostly insignificant). Thus, it can be concluded that Eastern Nepal has witnessed some significant drier days in the last two decades, as the events of heavy, very heavy, extremely heavy precipitation events, and annual wet day precipitation (PRCPTOT) were found to be decreasing. The same phenomena were also seen in the Tropical Rainfall Measuring Mission 3B42 V7 satellite precipitation product for whole Nepal.

How to cite: Subba, S., Ma, Y., and Ma, W.: Spatial and Temporal Analysis of Precipitation Extremities of Eastern Nepal in the Last Two Decades (1997–2016), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2784, https://doi.org/10.5194/egusphere-egu2020-2784, 2020

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