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Biomass-derived provenance dominates glacial surface organic carbon in the western Himalaya.

Nizam, Sarwar and Sen, Indra Sekhar and Vinoj, V. and Galy, Valier and Selby, David and Azam, Mohammad F. and Pandey, Satyendra Kumar and Creaser, Robert A. and Agarwal, Avinash Kumar and Singh, Akhilendra Pratap and Bizimis, Michael (2020) 'Biomass-derived provenance dominates glacial surface organic carbon in the western Himalaya.', Environmental science & technology., 54 (14). pp. 8612-8621.

Abstract

The origin, transport pathways, and spatial variability of total organic carbon (OC) on the western Himalayan glaciers is poorly understood compared to that of black carbon (BC) and dust, but it is critically important to evaluate the climatic role of OC in the region. Applying the distribution of OC activation energy, 14C activity and radiogenic isotopes of 208Pb/204Pb, 207Pb/204Pb and 206Pb/204Pb in glacial debris and atmospheric particulate matter (PM10 size fraction) we demonstrate that 98.3 ± 1.6% and 1.7 ± 1.6% of the OC in western Himalayan glaciers are derived from biomass and petrogenic sources, respectively. The δ13C and N/C composition shows that the biomass is a complex mixture of C3 vegetation and autochthonous photo-autotrophic inputs modified by heterotrophic microbial activity. The dataset reveals that the studied western Himalayan glacier has negligible contributions from fossil fuel-derived particles, which contrasts to the central and eastern Himalayan glaciers that have significant contributions from fossil fuel sources. We show that this spatial variability of OC sources relates to regional differences in air-mass transport pathways and precipitation regimes over the Himalaya. Moreover, our observation suggests that biomass-derived carbon could be the only primary driver of carbon-induced glacier melting in the western Himalaya.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acs.est.0c02710
Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental science & technology copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.est.0c02710
Date accepted:25 June 2020
Date deposited:03 July 2020
Date of first online publication:25 June 2020
Date first made open access:25 June 2021

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