Comparative Evaluation of Rain and Temperature Grid Data of Global Land Data Assimilation System (Case study: Helleh basin)

Document Type : Research Paper


1 Ph.D. Graduate, Department of Hydrology and Water Resources, Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Professor, Department of Hydrology and Water Resources, Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

3 Associate Professor, Department of Hydrology and Water Resources, Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

4 M.Sc. Graduate, Department of Water Engineering and Management, Faculty of Agriculture, Tarbiat Modares Universitys, Tehran, Iran.


The present study, while introducing the Global Land Data Assimilation System (GLDAS) database, evaluates the performance of this database in estimating two meteorological variables of precipitation and air temperature in two daily and monthly time scales in the Helleh catchment area located in southern Iran. To achieve the objectives of the study, the data of eleven rainfall and temperature gauges in the catchment area was used for fourteen years. In this study, in order to compare the gridbased data and station points, laps rate downscale method of temperature and precipitation and statistical indicators were used. The results show that the performance of GLDAS database in estimating air temperature is much better than precipitation, so that on a daily time scale, the average value of the coefficient of determination in eleven stations for estimating precipitation is 0.329, respectively, while the performance in estimating air temperature with the coefficient of determination of 0.934 is Very suitable. On a monthly scale, the results of this study show that the performance of the GLDAS database is very good in estimating both temperature and precipitation variables, so that on a monthly basis, the coefficient of determination in air temperature and precipitation parameters are 0.984 and 0.857, respectively. Therefore, it can be said that the suitability of performance in a meteorological variable is not a reason for suitability in all parameters. According to the mean error index, the GLDAS database overestimates the temperature data, but underestimates the precipitation data. In Error zoning it can be seen that basin surface characteristics such as altitude can also be effective in evaluating the performance of the base.


Main Subjects

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