Debris-Covered Glacier Energy Balance Model for Imja-Lhotse Shar Glacier in the Everest Region of Nepal

dc.contributor.utaustinauthorRounce, D. R.en_US
dc.contributor.utaustinauthorMcKinney, D. C.en_US
dc.creatorRounce, D. R.en_US
dc.creatorQuincey, D. J.en_US
dc.creatorMcKinney, D. C.en_US
dc.date.accessioned2016-09-23T18:06:19Z
dc.date.available2016-09-23T18:06:19Z
dc.date.issued2015-12en_US
dc.description.abstractDebris thickness plays an important role in regulating ablation rates on debris-covered glaciers as well as controlling the likely size and location of supraglacial lakes. Despite its importance, lack of knowledge about debris properties and associated energy fluxes prevents the robust inclusion of the effects of a debris layer into most glacier surface energy balance models. This study combines fieldwork with a debris-covered glacier energy balance model to estimate debris temperatures and ablation rates on Imja-Lhotse Shar Glacier located in the Everest region of Nepal. The debris properties that significantly influence the energy balance model are the thermal conductivity, albedo, and surface roughness. Fieldwork was conducted to measure thermal conductivity and a method was developed using Structure from Motion to estimate surface roughness. Debris temperatures measured during the 2014 melt season were used to calibrate and validate a debris-covered glacier energy balance model by optimizing the albedo, thermal conductivity, and surface roughness at 10 debris-covered sites. Furthermore, three methods for estimating the latent heat flux were investigated. Model calibration and validation found the three methods had similar performance; however, comparison of modeled and measured ablation rates revealed that assuming the latent heat flux is zero may overestimate ablation. Results also suggest that where debris moisture is unknown, measurements of the relative humidity or precipitation may be used to estimate wet debris periods, i.e., when the latent heat flux is non-zero. The effect of temporal resolution on the model was also assessed and results showed that both 6 h data and daily average data slightly underestimate debris temperatures and ablation rates; thus these should only be used to estimate rough ablation rates when no other data are available.en_US
dc.description.departmentCenter for Water and the Environmenten_US
dc.description.sponsorshipUSAID Climate Change Resilient Development (CCRD) projecten_US
dc.identifierdoi:10.15781/T2ST7DZ33
dc.identifier.citationRounce, D. R., D. J. Quincey, and D. C. McKinney. "Debris-covered glacier energy balance model for Imja–Lhotse Shar Glacier in the Everest region of Nepal." The Cryosphere 9, no. 6 (Dec., 2015): 2295-2310.en_US
dc.identifier.doi10.5194/tc-9-2295-2015en_US
dc.identifier.issn1994-0416en_US
dc.identifier.urihttp://hdl.handle.net/2152/41096
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialCryosphereen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectthermal-conductivityen_US
dc.subjectheat-transferen_US
dc.subjectice melten_US
dc.subjectroughnessen_US
dc.subjectthicknessen_US
dc.subjecthimalayaen_US
dc.subjectimageryen_US
dc.subjectsurfaceen_US
dc.subjectbeneathen_US
dc.subjectlayeren_US
dc.subjectgeography, physicalen_US
dc.subjectgeosciences, multidisciplinaryen_US
dc.titleDebris-Covered Glacier Energy Balance Model for Imja-Lhotse Shar Glacier in the Everest Region of Nepalen_US
dc.typeArticleen_US

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