Abstract
Selection of suitable predictor(s) from the NCEP/NCAR reanalysis datasets for downscaling annual and seasonal rainfall over the Western Himalayas has been carried out in the present study. Size of the domain on downscaling was also judged by considering three different sizes of domains, namely Western Himalayan region (WHR), India and South Asia. Statistical measures like spatial correlation maps, product-moment correlations, and adjusted R2 of regression analysis were used to evaluate the skills of the predictors. Results showed predictors were sensitive to the method of analysis, choice of season, and size of the domain. A majority of the predictors exhibited stronger spatial correlations (±) in annual and monsoon season compared to the winter. It was found that the first principal components (PCs) of most of the predictors were consistently well correlated (RE) with the annual and monsoon rainfall in all domains, whereas, in the winter season, none of the PCs showed such consistent results. During the monsoon season, the predictors had higher RE values than the winter and annual time scale. Geopotential height at 850 hPa, relative humidity at 500 and 1000 hPa, and precipitation rate emerged as good predictors for downscaling precipitation over different predictor domains. On the other hand, the geopotential height at 500 and 850 hPa, v at 500 hPa, specific humidity at 500 hPa, and divergence at 850 hPa resulted as least affected predictors based on analysis of ranks of the predictors. Finally, WHR was considered as a suitable predictor domain for downscaling monsoon rainfall for the Western Himalayan region compared to other domains as ranks obtained for different predictors in this domain are not very sensitive to statistical measures used to evaluate the skills of predictors.
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Acknowledgments
The authors would like to thank India Meteorological Department, and NCEP/NCAR for providing the required data for the present study. JKM would like to thank all the members of climate simulation lab, Bidhan Chandra Krishi Viswavidyalaya, West Bengal, for their constant support in preparing the work. The authors would like to thank the anonymous reviewers for their critical comments on the present work and improvements suggested by them.
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Appendix
z = geopotential height | t2 m = air temperature at 2 m |
mslp = mean sea level pressure | sf = surface airflow strength |
t = air temperature | su = surface zonal wind velocity |
u = zonal wind velocity | sv = surface meridional wind velocity |
v = meridional velocity | sƱ = surface vorticity |
prw = precipitable water | sw = surface wind direction |
sp = surface pressure | s▽ = surface divergence |
s = specific humidity | sr = surface relative humidity |
r = relative humidity | ss = surface specific humidity |
NB numbers associated with each variable shows the pressure level at that hPa
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Meher, J.K., Das, L. Selection of suitable predictors and predictor domain for statistical downscaling over the Western Himalayan region of India. Theor Appl Climatol 139, 431–446 (2020). https://doi.org/10.1007/s00704-019-02980-z
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DOI: https://doi.org/10.1007/s00704-019-02980-z