Validation of the satellite-derived rainfall estimates over the Tibet
- 924 Downloads
Measuring rainfall from space appears to be the only cost effective and viable means in estimating regional precipitation over the Tibet, and the satellite rainfall products are essential to hydrological and agricultural modeling. A long-standing problem in the meteorological and hydrological studies is that there is only a sparse raingauge network representing the spatial distribution of precipitation and its quantity on small scales over the Tibet. Therefore, satellite derived quantitative precipitation estimates are extremely useful for obtaining rainfall patterns that can be used by hydrological models to produce forecasts of river discharge and to delineate the flood hazard area. In this paper, validation of the US National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center (CPC) RFE (rainfall estimate) 2.0 data was made by using daily rainfall observations at 11 weather stations over different climate zones from southeast to northwest of the Tibet during the rainy season from 1 June to 30 September 2005 and 2006. Analysis on the time series of daily rainfall of RFE-CPC and observed data in different climate zones reveals that the mean correlation coefficients between satellite estimated and observed rainfall is 0.74. Only at Pali and Nielamu stations located in the southern brink of the Tibet along the Himalayan Mountains, are the correlation coefficients less than 0.62. In addition, continuous validations show that the RFE performed well in different climate zones, with considerably low mean error (ME) and root mean square error (RMSE) scores except at Nielamu station along the Himalayan range. Likewise, for the dichotomous validation, at most stations over the Tibet, the probability of detection (POD) values is above 73% while the false alarm rate (FAR) is between 1% and 12%. Overall, NOAA CPC RFE 2.0 products performed well in the estimation and monitoring of rainfall over the Tibet and can be used to analyze the precipitation pattern, produce discharge forecast, and delineate the flood hazard area.
Key wordsprecipitation validation satellite rainfall estimation Tibetan Plateau
Unable to display preview. Download preview PDF.
- Bajracharya, S. R., M. S. Shrestha, S. Thapa, et al., 2008: Validation of satellite rainfall estimation in the summer monsoon dominated area of the Hindu Kush-Himalayan region. Proc. 4th International Precipitation Working Group Workshop, National Satellite Meteorological Center, Chinese Meteorological Administration, 26–37.Google Scholar
- Barrett, E. C., and D. W. Martin, 1981: The Use of Satellites in Rainfall Monitoring. Academic Press, London, 340 pp.Google Scholar
- Funk, C., and J. Verdin, 2003: Comparing satellite rainfall estimates and reanalysis precipitation fields with station data for western Kenya. Proc. Int. Workshop on CropMonitoring for Food Security in Africa. European Joint Research Centre/UN Food and Agriculture Organization, 89–95.Google Scholar
- Kamarianakis, Y., N. Chrysoulakis, H. Feidas, et al., 2006: Comparing rainfall estimates derived from rain gages and satellite images at the eastern Mediterranean region. Proc. 9th AGILE Conference on Geographic Information Science: Shaping the future of Geographic Information Science in Europe, 15–20.Google Scholar
- Shrestha, M. S., S. R. Bajracharya, and P. K. Mool, 2008: Satellite rainfall estimation in the Hindu Kush-Himalayan region. International Centre for Integrated Mountain Development (ICIMOD), Kathmandu, 3–4.Google Scholar
- The Scientific Expedition to Tibetan Plateau, 1984: Climate in Tibet. Science Press, Beijing, 43–44.Google Scholar
- Zhao, L., R. Ferraro, and D. Moore, 2000: Validation of NOAA-15 AMSU-A rain rate algorithms. 10th Conf. on Satellite Meteor., 192–195.Google Scholar