However, a positive trend in deposition was observed in the Caucasus likely due to increasingly dry conditions in North Africa and the middle East 41 .
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Black carbon and dust alter the response of mountain snow cover under climate change.
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Past trends (1979–2018) The simulated SMOD for snow with BC and dust shows a negative trend over the last decades (1979–2018) indicating earlier snowmelt (Fig. 3 ).