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Three new lakes may form in Parkachik Glacier in Ladakh due to glacial retreat

Ladakh:28/7/23:  The Parkachik Glacier in Ladakh is likely to have three lakes of different dimensions due to subglacial over-deepening — a characteristic of basins and valleys eroded by glaciers, shows a new study.

Considering their sensitivity and as a most direct and apparent visible indicator of regional climate change, Himalayan glaciers have been subjected to numerous studies, from field-based investigations to the modern state-of-the-art remote sensing approach, for more than a century. In contrast, understanding the ice thickness and distribution is foremost required for the Himalayan glaciers. However, existing approaches, like remote sensing, cannot directly estimate the glacier thickness. Based on ground penetrating radar, very few studies have been carried out on glacier thickness in the Indian Himalaya.

Scientists from Wadia Institute of Himalayan Geology, an autonomous institute under the Department of Science & Technology (DST), GoI carried out a study that describes the morphological and dynamic changes of Parkachik Glacier, Suru River Valley, Ladakh Himalaya, India. The findings were published in the journal ‘Annals of Glaciology’.

The team of Scientists lead by Dr. Manish Mehta used medium-resolution satellite images; CORONA KH-4, Landsat, and Sentinel-2A from 1971–2021, and field surveys between 2015 and 2021. In addition, they used the laminar flow-based Himalayan Glacier Thickness Mapper and provided results for recent margin fluctuations, surface ice velocity, and ice thickness, and identified glacier-bed over-deepening. The results revealed that overall the glacier retreat varied between 1971 and 2021. The remote sensing data shows that the glacier retreated with an average rate of around 2 ma1 between 1971 and 1999 whereas, between 1999 and 2021, the glacier retreated at an average rate of around 12 ma1. Similarly, the field observations recorded through day-to-day monitoring suggest that the glacier retreated at a higher rate of 20.5 ma1 between 2015 and 2021. Both the field and satellite-based observations indicate that the calving nature of the glacier margin and the development of a proglacial lake may have enhanced the retreat of the Parckachik Glacier.

Furthermore, the surface ice velocity estimated using COSI-Corr on the Landsat data Surface was found to be around 45 ma1 in the lower ablation zone in 1999–2000 and 32 ma1 in 2020–2021, thus reducing by 28%. In addition, the maximum thickness of the glacier is estimated to be around 441m in the accumulation zone, while for the glacier tongue, it is around 44 m. The simulation results suggest that if the glacier continues to retreat at a similar rate, three lakes of different dimensions may form due to subglacial over-deepening.

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Ashok Palit has completed his graduation from Upendranath College Soro, Balasore and post graduation from Utkal University in Odia Language and literture.. He has also carved out a niche for himself as a scribe of eminence after joining the profession in 1988. He is also an independent media production professional. He brings loads of experience to Advanced Media, Ashok Palit as a cineaste has been active in film criticism for over three decades. As a film society activist, he soared to eminence for his profound commitment to the art film appreciation and aesthetics of cinema. His mode of discourse is often erudite but always lucid and comprehensible marked by a perfect acumen so rare in the field. A film aesthete with an immense fond of critical sensibilities, he wrote about growth and development of odia cinema in New Indian Express, The Times of India, The Hindustan Times, The Asian Age and Screen. He has been working as an Editor for Cine Samaya from 2002-2004.. He had made solid contribution on cinema in many odia Dailies and weekly such as Samaj, Prajatantra, Dharatri, Samaya, Satabadi, and weekly Samaya.

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