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Climate change, glacier topography & morphology control glacial retreat

Bhubaneswar:7/3/23:Change in debris cover plays a critical role in the glacier surface lowering, shrinkage, retreat, and mass balance, according to a recent study. Therefore, these factors need to be accounted for in future studies for a complete understanding of the observed glacier changes and responses.

Despite the importance of the Himalayan glaciation, the knowledge of the glacial dynamics and the factors that influence these dynamics is scanty. Recent studies of Himalayan glaciers indicate wide variability in retreat rate and mass balance in different sectors of the mountain range, primarily linked to the topography and climate of the region. However, variable retreat rates of glaciers and inadequate supporting field data (e.g., mass balance, ice thickness, velocity, etc.) of the Himalayan glaciers make it challenging to develop a coherent picture of climate change impact.

One of the significant characteristics of the Himalayan glaciers is that the glaciers are mainly debris-covered and have been receding since the end of the Little Ice Age. The supraglacial debris on the surface of glaciers is commonly found to have significant control over the rate of loss of mass of ice due to sun, wind, or rain (ablation). It has been observed that the thickness of supraglacial debris significantly alters the glacier response to climate forcing.

A team of scientists from Wadia Institute of Himalayan Geology (WIHG), Dehradun, Uttarakhand, India (An autonomous institute under DST, India), quantitatively evaluated the influence of the debris cover on the loss of ice mass in summer (summer ablation) and on terminus recession of glaciers.

Dr. Manish Mehta and his team studied two glaciers with different characteristics — the Pensilungpa Glacier (PG) in Suru River and the Durung-Drung Glacier (DDG) in Doda River basins of Zanskar in the Leh district of Ladakh for a comparative study of glacier fluctuations between 1971 and 2019. While a thick debris cover characterizes the PG, the DDG has a thin debris cover, and their comparative analysis helped them trace the influence of various factors on the mass balance process.

They found that the glacier retreat rate is controlled by climate change and the topographic setting and morphology of the glacier. Their comparative study published in the journal Sustainability also confirms the possible influence of factors such as snout geometry, glacier size, elevation range, slope, aspect, debris cover, as well as the presence of supra and proglacial lakes other than the climate in the heterogeneous glacial dynamics and underlined the need to include these in glacial studies.

About Editor in chief

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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