Journal of Range and Watershed Managment

Evaluation of Spatial and Temporal Variability of the several datasets for precipitation over Iranian watersheds

Document Type : Research Paper

Authors

Maryam Rostami 1
Ali Salajegheh 2
Forood Sharifi 3
Arash Malekian 4
TAYYEBEH MESBAHZADEH 4

1 PhD Graduate in Watershed Management, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 Professor of Soil conservation and watershed management Research Institute, Tehran, Iran

4 Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran

https://doi.org/10.22059/jrwm.2021.281778.1386
Abstract
Abstract

Precipitation plays an important role in climatic, water, energy and biogeochemical cycles. Several global and regional data sets currently provide historical estimates of this variable over Iran, including the MWEP and WFDEI forcing datasets and production of some institutions such as MOHC, SMHI and IITM. All these datasets provide data with different resolutions based on gage stations, satellite Images and models output. In this study, we do an inter comparison between these data sets during 1990- 2008. We also validate all ten data sets against independent ground station observations over 30 second-order basins of Iran. MSWEP and WFDEI have an acceptable compatibility with observational data on different spatial and temporal resolutions. RMSE and Bias are 5.68, 6.34 and 0.58, 2.75 for these two datasets during 228 months, respectively. However, it is needed that MSWEP improves in the western and northwestern parts of the country and WFDEI in June and September months. Our findings in this research provide valuable guidance for a variety of stakeholders, including rainfall- runoff and land-surface modelers, watershed management studies and data providers.

Keywords

Precipitation
validation
GPCC
Watersheds of Iran
MSWEP/E2OFD and WFDEI-GPCC/V2/Leap
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Journal of Range and Watershed Managment
Volume 75, Issue 2
Summer 2022
Pages 181-196

  • Receive Date 20 May 2019
  • Revise Date 12 July 2019
  • Accept Date 09 August 2019
  • Publish Date 06 September 2022

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