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The aim of the study was to compare reanalysis wind data with mast measured data at Hawks Bay, Karachi, which is in the coastal region of Pakistan. MERRA and MERRA-2 reanalysis datasets, assimilated by NASA global data assimilation system, is used for this study. The comparison between wind data has been made for 10 m, 50 m and 80 m heights and on the daily and hourly basis. Statistical parameters that have been used for this study are; correlation coefficient, mean bias error, standard deviation of error and root mean square error. MERRA-2 data shows better results for wind speed at 10 m and for wind direction at 80 m in terms of statistical parameters and correlation coefficient. MERRA-2 gives best correlation coefficients for wind speed which are 0.70 and 0.91 for hourly and daily respectively at 10 m whereas correlation coefficients for wind direction are 0.66 and 0.76 for hourly and daily respectively at 80 m. In Pakistan, the wind energy industry is in developing phases, the current work will contribute towards wind energy utilization in Pakistan.

Muhammad Asim, Amjad Hussain, Ghulam Moeen uddin, Nasir Hayat, Faisal Iqbal Qureshi. (2020) Comparing MERRA and MERRA-2 Reanalysis Datasets with Mast Measured Wind Data for Karachi, Pakistan, Pakistan Journal of Engineering and Applied Sciences, Volume 26, Issue 1.
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