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Elevation dependent precipitation and temperature changes over Indian Himalayan region

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Abstract

Various studies reported an elevation dependent precipitation and temperature changes in mountainous regions of the world including the Himalayas. Various mechanisms are proposed to link the possible dependence of the precipitation and temperature on elevation with other variables, including, long- and short-wave radiation, albedo, clouds, humidity, etc. In the present study changes and trends of precipitation and temperature at different elevation ranges in the Indian Himalayan region (IHR) is assessed. Observations and modelling fields during the period 1970–2099 are used. Modelling simulations from the Coordinated Regional Climate Downscaling Experiment-South Asia experiments (CORDEX-SA) suites are considered. In addition, four seasons—winter (Dec, Jan, Feb: DJF), pre-monsoon (Mar, Apr, May: MAM), monsoon (Jun, Jul, Aug, Sep: JJAS) and post-monsoon (Oct, Nov: ON)—are considered to detect the possible seasonal response of elevation dependency. Firstly, precipitation and temperature fields, separately, as well as the diurnal temperature range (DTR) are assessed. Following, their long-term trends are investigated, if varying, at different elevational ranges in the IHR. To explain plausible physical mechanisms due to elevation dependency, trend of other variables viz., surface downward longwave radiation (DLR), total cloud faction, soil moisture, near surface specific humidity, surface snow melt and surface albedo, etc. are investigated. Results point towards an decreased (increased) precipitation in higher (lower) elevation. And amplified warming signals at higher elevations (above 3000 m), both in daytime and nighttime temperatures, during all seasons except the monsoon, are noticed. Increased DLR trends at higher elevation are also simulated well by the model and are likely the main elevation dependent driver in the IHR.

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Acknowledgements

APD acknowledges financial support by MoEF&CC under NMHS scheme. Authors also acknowledge the Earth System Grid Federation (ESGF) infrastructure and the Climate Data Portal at Centre for Climate Change Research (CCCR), Indian Institute of Tropical Meteorology, India for provision of REMO data under CORDEX-SA.

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Correspondence to A. P. Dimri.

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Dimri, A.P., Palazzi, E. & Daloz, A.S. Elevation dependent precipitation and temperature changes over Indian Himalayan region. Clim Dyn 59, 1–21 (2022). https://doi.org/10.1007/s00382-021-06113-z

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  • DOI: https://doi.org/10.1007/s00382-021-06113-z

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