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Farhadi, M., Jahan, M., Bannayan Aval, M. (2021). Investigation of Validity and Possibility of using AgMERRA Networked Dataset in North Khorasan Province. , 19(2), 201-217. doi: 10.22067/jcesc.2021.69532.1044
M Farhadi; M Jahan; M Bannayan Aval. "Investigation of Validity and Possibility of using AgMERRA Networked Dataset in North Khorasan Province". , 19, 2, 2021, 201-217. doi: 10.22067/jcesc.2021.69532.1044
Farhadi, M., Jahan, M., Bannayan Aval, M. (2021). 'Investigation of Validity and Possibility of using AgMERRA Networked Dataset in North Khorasan Province', , 19(2), pp. 201-217. doi: 10.22067/jcesc.2021.69532.1044
Farhadi, M., Jahan, M., Bannayan Aval, M. Investigation of Validity and Possibility of using AgMERRA Networked Dataset in North Khorasan Province. , 2021; 19(2): 201-217. doi: 10.22067/jcesc.2021.69532.1044

Investigation of Validity and Possibility of using AgMERRA Networked Dataset in North Khorasan Province

پژوهشهای زراعی ایران
Article 7, Volume 19, Issue 2 - Serial Number 62, July 2021, Pages 201-217    PDF (3.53 M)
Document Type: Research Article
DOI: 10.22067/jcesc.2021.69532.1044
Authors
M Farhadi1; M Jahan* 2; M Bannayan Aval2
1PhD student, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran
2Faculty of Agriculture, Ferdowsi University of Mashhad, Iran
Abstract
Introduction
Investigating the effect of climate change on agricultural production in spatio-temporal dimension, development and use of crop management decision-support tools, supporting and target agronomic research and policy require a series of accurate and standard meteorological data. The weather station databases are often regional in coverage, and it can have extensive gaps in station coverage over time. It may also contain errors in climate records, station coordinates or elevation. While historical observational data are incomplete or not available in many areas; therefore, gridded weather data are used as an alternative in these areas. An issue is the agreement of gridded with measured weather data and the degree to which this agreement may influence the utility of gridded for agricultural research.  In this study, the possibility of using AgMERRA data series to fill the gap of incomplete and missing historical data in seven synoptic meteorological stations in North Khorasan province in the period (1980-2010) was investigated.
Materials and Methods
Historical daily measured weather data (maximum and minimum air temperature, sunshine hours, relative humidity, and precipitation) for the 1980 to 2010 period, were obtained from the 7 synoptic weather stations (Bojnord, Shirvan, Farooj, Esfarayen, Mane-Semelghan, Raz-Jargalan, Jajarm) across Northern Khorasan.  The robustness of AgMERRA dataset was investigated through statistical validation indices including RMSE (Root Mean Square Error), R2 (Coefficient of Determination), d (d Index of Agreement), NRMSE (Normalized Root Mean Square Error) and MBE (Mean Bias Error). 
Result and Discussion
Strong positive correlations were observed between simulated values ​​of maximum and minimum temperature with observational values (0.81 ≤ r ≤ 0.96). The NRMSE was excellent and good for all stations (7.76 ≤ NRMSE ≤ 15.81). Overall, the high agreement index (d ≥ 0.92), as well as the small values ​​of the MBE, indicated good agreement between the observed and predicted data for the maximum and minimum temperature variable. The solar radiation simulations correlated well with the observed values (0.86 ≤  r ≤ 0.93). The high values for agreement index were obtained in four stations (0.96 ≤ d ≤ 0.98). But the NRMSE for Bojnourd, Esfarayen, and Jajarm stations was ranked in moderate class (20 < NRMSE < 30), and weak class for Mane Semelghan station (NRMSE = 32.31). Other stations (Shirvan, Farooj, and Raz-Jargalan) did not have station observation values for the radiation variable. AgMERRA had a relatively high ability to simulate the relative humidity variable at maximum temperature for Shirvan, Farooj, Esfarayen, and Jajarm stations. The agreement index for these stations was between 0.92 and 0.94, also those NRMSE was ranked in the good class. The coefficient of correlation (r) between the predicted values with the observational data of the relative humidity at maximum temperature )Rhstmax(  ranged from 0.40 to 0.70. The low r value can be related to the topographic conditions and low vegetation of these areas. AgMERRA daily precipitation data had excellent NRMSE. Due to the weak correlation between the predicted daily precipitation data and the observational data, the total monthly precipitation of each station was examined, which showed better correlation and NRMSE than of the daily precipitation. Considering the monthly time scale compared to the daily, NRMSE reduced from a high class to a good class, also a strong correlation was obtained especially for Raz- Jarglan (0.88), Esfarayen (0.84), and Mane Semolghan (0.80) stations.
Conclusions
 AgMERRA gridded dataset for maximum and minimum temperature, solar radiation excluding daily precipitation and relative humidity at maximum temperature showed high accordance (d> 0.92 and NRMSE <30%) and strong correlation (0.81 ≤ r ≤ 0.96) with station data in arid, semiarid, temperate, cold and mountainous areas of North Khorasan province.  However, a more strong correlation was obtained when daily precipitation data were aggregated into monthly data. In general, the validation results of the AgMERRA simulated values with 7 synoptic stations indicated its robustness and power to produce meteorological data series. So AgMERRA data series can be used for climate studies, analysis, planning and decision making in agriculture section in North Khorasan province.
Keywords
Agricultural meteorology; Spatio-temporal changes; Stations data; Validation
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