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Linkage between the absorbing aerosol-induced snow darkening effects over the Himalayas-Tibetan Plateau and the pre-monsoon climate over northern India

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Abstract

The role of aerosol on the snow darkening effect is considered one of the main factors contributing to snow melting and glacier retreat over the Himalayas and Tibetan Plateau (HTP). Using the International Centre for Theoretical Physics (ICTP)’s regional climate model, RegCM4, we examine the changes induced by aerosol deposition over the HTP snow and its dynamical impacts over northern India during the pre-monsoon season (March to June), which is critical for the inception and development of the monsoon. Sensitivity experiments with and without aerosol-induced snow darkening effects for the period 2006–2010 reveal that this effect causes a significant reduction of snow cover fraction by 10 to 15% and an increase in surface temperatures (> 4 °C), which improves the model performance when comparing against observations over the HTP. This response is dominated by dust deposition, which covers a larger area of the HTP compared to the black carbon. While incorporating aerosol-induced snow darkening effect, the precipitation decreases (~ 0.4–2 mm/day) over northern India due to intrusion of dry winds, which also enhance dust emissions over the Thar Desert. As a result of the decrease in precipitation, surface temperature increases and generates a low-pressure system over northern India, which further strengthens the dust transport and its burden. We also find decreases in precipitation extremes and increases in the number of consecutive dry days and extreme temperature conditions over northern India, implying strong links with changes in pre-monsoon dynamics. The aerosol-induced snow darkening effect thus facilitates an earlier monsoon onset over southern India, but the northward propagation of the precipitation band is limited by the enhanced northwesterly winds over the Indo-Gangetic Plain.

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taken from TRMM for precipitation and MODIS for snow fraction during the pre-monsoon (March to June) for the period 2006–2010. The green slant lines represent regions with 95% significance level

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Data availability

All the ICBC and anthropogenic aerosol emission data used to run the model are archived in http://clima-dods.ictp.it/data/regcm4/. The model simulated data can be made available from the corresponding author on reasonable request.

Code availability

The RegCM model code can be downloaded from https://github.com/ictp-esp/RegCM/releases.

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Acknowledgements

We thank the anonymous reviewers for the constructive comments that improved the quality of the manuscript. The authors are thankful to the supercomputing facility provided by Marconi installed in CINECA machine and Argo at ICTP, where all the simulations and initial model tuning were carried out respectively. ICTP’s RegCM4 model is freely available online in https://github.com/ictp-esp/RegCM/releases. The anthropogenic aerosol emissions considered for baseline and mitigation of SLCPs are taken from ECLIPSE data inventory.

The data can be accessed from an online website clicking the following link http://www.iiasa.ac.at/web/home/research/researchPrograms/air/ECLIPSEv5a.html. The lateral boundary conditions and topographical data can be downloaded from http://clima-dods.ictp.it/data/regcm4/. All the observation data sources are highly acknowledged. The first author is thankful to the UN-ICTP’s postdoctoral fellowship for carrying out the research. A.S. Panicker and A.S. Gautam acknowledge ICTP, Italy, for Junior Associateship for collaborative research. VSN acknowledges SwarnaJayanti Fellowship of DST, Govt. of India.

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SD and FG conceptualized the research. SD, FG, and EC customized the RegCM model over the region of study. SD performed the model simulations with the inputs from EC, VSN, and GG. ASP and ASG helped in analyzing the model results. All the authors contributed in writing, analyzing, and finalizing the manuscript.

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Correspondence to Sushant Das.

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The authors declare no competing interests.

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Das, S., Giorgi, F., Coppola, E. et al. Linkage between the absorbing aerosol-induced snow darkening effects over the Himalayas-Tibetan Plateau and the pre-monsoon climate over northern India. Theor Appl Climatol 147, 1033–1048 (2022). https://doi.org/10.1007/s00704-021-03871-y

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  • DOI: https://doi.org/10.1007/s00704-021-03871-y

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