TY - JOUR T1 - Biomass-Derived Provenance Dominates Glacial Surface Organic Carbon in the Western HimalayaBiomass-Derived Provenance Dominates Glacial Surface Organic Carbon in the Western Himalaya JF - Environmental Science & Technology Y1 - 2020 A1 - Nizam, Sarwar A1 - Sen, Indra S. A1 - Vinoj, Velu A1 - Galy, Valier A1 - Selby, David A1 - Azam, Mohammad F. A1 - Pandey, Satyendra K. A1 - Creaser, Robert A. A1 - Agarwal, Avinash K. A1 - Singh, Akhilendra P. A1 - Bizimis, Michael KW - ; MASS BALANCES KW - AEROSOLS KW - ALBEDO REDUCTION KW - ATMOSPHERIC LEAD KW - BLACK CARBON KW - DUST TRANSPOR KW - isotopic composition KW - PB KW - SNOW ALBEDO KW - TIBETAN PLATEAU AB - The origin, transport pathway, and spatial variability of total organic carbon (OC) in the western Himalayan glaciers are poorly understood compared to those of black carbon (BC) and dust, but it is critically important to evaluate the climatic role of OC in the region. By applying the distribution of OC activation energy; C-14 activity; and radiogenic isotopes of Pb-208/Pb-204, (207)pb/(204)pb and (206)pb/Pb-204 in glacial debris and atmospheric particulate matter (PM10 size fraction), we demonstrate that 98.3 +/- 1.6 and 1.7 +/- 1.6% of OC in western Himalayan glaciers are derived from biomass and petrogenic sources, respectively. The (delta C-13 and N/C composition indicates that the biomass is a complex mixture of C3 vegetation and autochthonous photoautotrophic input modified by heterotrophic microbial activity. The data set 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. VL - 54 UR - https://apps.webofknowledge.com/InboundService.do?product=WOS&Func=Frame&DestFail=http%3A%2F%2Fwww.webofknowledge.com&SrcApp=search&SrcAuth=Alerting&SID=8Aqj2WiW4A71bymjSli&customersID=Alerting&mode=FullRecord&IsProductCode=Yes&AlertId=ab9062f8-b111-4f95- IS - 14 ER -