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Impact of subgrid scale scheme on topography and landuse for better regional scale simulation of meteorological variables over the western Himalayas

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Abstract

An attempt is made to integrate subgrid scale scheme on the work of Dimri and Ganju (Pure Appl Geophys 167:1–24, 2007) to understand the overall nature of surface heterogeneity and landuse variability along with resolvable finescale micro/meso scale circulation over the Himalayan region, which is having different altitudes and orientations causing prevailing weather conditions to be complex. This region receives large amount of precipitation due to eastward moving low-pressure synoptic weather systems, called western disturbances, during winter season (December, January, February—DJF). Surface heterogeneity and landuse variability of the Himalayan region gives rise to numerous micro/meso scale circulation along with prevailing weather. Therefore, in the present work, a mosaic type parameterization of subgrid scale topography and landuse within a framework of a regional climate model (RegCM3) is extended to study interseasonal variability of surface climate during a winter season (October 1999–March 2000) of the work of Dimri and Ganju (Pure Appl Geophys 167:1–24, 2007). In this scheme, meteorological variables are disaggregated from the coarse grid to the fine grid, land surface calculations are then performed separately for each subgrid cell, and surface fluxes are calculated and reaggregated onto the coarse grid cell for input to the atmospheric model. By doing so, resolvable finescale structures due to surface heterogeneity and landuse variability at coarse grid are subjected to parameterize at regular finescale surface subgrid. Model simulations show that implementation of subgrid scheme presents more realistic simulation of precipitation and surface air temperature. Influence of topographic elevation and valleys is better represented in the scheme. Overall, RegCM3 with subgrid scheme provides more accurate representation of resolvable finescale atmospheric/surface circulations that results in explaining mean variability in a better way.

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Acknowledgments

The author acknowledges Prof. F. Giorgi, Dr. X. Bi and Dr. N. Elguindi and The Abdus Salam International Center for Theoretical Physics (ICTP), Trieste, Italy for providing necessary help for the above study. Also, authors acknowledge the National Center for Environmental Prediction (NCEP), US for providing valuable data sets for accomplishing this work. Author expresses his gratitude towards Dr. R. N. Sarwade, Director S.A.S.E., for his help and encouragement for the present work.

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  1. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India

    A. P. Dimri

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Correspondence to A. P. Dimri.

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Dimri, A.P. Impact of subgrid scale scheme on topography and landuse for better regional scale simulation of meteorological variables over the western Himalayas. Clim Dyn 32, 565–574 (2009). https://doi.org/10.1007/s00382-008-0453-z

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