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- W4292730314 abstract "• Formulation of AI for glaciers using snowfall, snowmelt and temperature trends. • AI-based sorting of glacier-negative (losing mass) and glacier-positive (gaining mass). • Meteorological, stable isotope and geomorphic proof for glacier-positive behaviour in Karakoram. • Investigation of glacier-positive behaviour outside of the Karakoram region. • Linking AI to Himalayan precipitation periodicity via IOD, ISM and MLW connectivity. The anomalous behaviour of the Karakoram glaciers has been a decade-long discussion. While a lot of effort has been given to understanding this phenomenon, little has been explored with respect to the factors that govern glacier accumulation rates. We performed a time-series analysis of 17 Himalayan glaciers to evaluate the Accumulation Index (AI), examine the ice accumulation/ablation balance of each glacier, and investigate the natural periodicities in regional climatic behaviour. Based on the AI, the Himalayan glaciers have been characterised as ‘glacier-positive’ and ‘glacier-negative’. Glacier-positive behaviour in the Karakoram is favoured by global meteorological and local topographical factors. Analysis of 120 years of meteorological data shows a significant positive trend in winter and annual precipitation in the northwestern Himalayas, linked to surfacial warming and the Indian Ocean Dipole, while local factors such as slope, aspect and supraglacial debris constrain summer ablation. Additionally, the Karakoram precipitation is periodic in nature, demonstrating anti-correlation with decadal-scale precipitation records from the remaining Himalayan glaciers. Both local and global factors explain the anomaly in the Karakoram or the lack of it in other Himalayan glaciers. In a potentially warming planet, glacial accumulation rates are becoming increasingly sensitive to ambient temperatures, where glacier mass budget turns sharply negative at temperatures above 263 K due to accelerated summer ablation which overcompensates wintertime accumulation. This makes the Karakoram more sensitive to global meteorology than local factors. Therefore, it is important to address whether the Karakoram anomaly is an isolated climatic event or will it succumb to global climate change like the remainder of the Himalayan glaciers." @default.
- W4292730314 created "2022-08-23" @default.
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- W4292730314 date "2022-10-01" @default.
- W4292730314 modified "2023-09-29" @default.
- W4292730314 title "Hydrometeorological progression of the Himalayan cryosphere: The Karakoram predicament" @default.
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- W4292730314 doi "https://doi.org/10.1016/j.jhydrol.2022.128348" @default.
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