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dc.contributor.authorWinkler, M.
dc.contributor.authorJuen, Irmgard
dc.contributor.authorMolg, Thomas
dc.contributor.authorWagnon, Patrick
dc.contributor.authorGómez López, Jesús
dc.contributor.authorKaser, George
dc.coverage.spatialCordillera Blanca
dc.identifier.citationWinkler, M., Juen, I., Molg, T. et. al. (2009) Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú. The Cryosphere, 3, 21-30. doi:
dc.identifier.issnISSN: 1994-0416, ESSN: 1994-0424es_ES
dc.descriptionOriginal abstract: Sublimation plays a decisive role in the surface energy and mass balance of tropical glaciers. During the dry season (May–September) low specific humidity and high surface roughness favour the direct transition from ice to vapour and drastically reduce the energy available for melting. However, field measurements are scarce and little is known about the performance of sublimation parameterisations in glacier mass balance and runoff models. During 15 days in August 2005 sublimation was measured on the tongue of Glaciar Artesonraju (8°58' S, 77°38' W) in the Cordillera Blanca, Perú, using simple lysimeters. Indicating a strong dependence on surface roughness, daily totals of sublimation range from 1–3 kg m-2 for smooth to 2–5 kg m-2 for rough conditions. (The 15-day means at that time of wind speed and specific humidity were 4.3 m s-1 and 3.8 g kg-1, respectively.) Measured sublimation was related to characteristic surface roughness lengths for momentum (zm) and for the scalar quantities of temperature and water vapour (zs), using a process-based mass balance model. Input data were provided by automatic weather stations, situated on the glacier tongue at 4750 m a.s.l. and 4810 m a.s.l., respectively. Under smooth conditions the combination zm=2.0 mm and zs=1.0 mm appeared to be most appropriate, for rough conditions zm=20.0 mm and zs=10.0 mm fitted best. Extending the sublimation record from April 2004 to December 2005 with the process-based model confirms, that sublimation shows a clear seasonality. 60–90% of the energy available for ablation is consumed by sublimation in the dry season, but only 10–15% in the wet season (October–April). The findings are finally used to evaluate the parameterisation of sublimation in the lower-complexity mass balance model ITGG, which has the advantage of requiring precipitation and air temperature as only input data. It turns out that the implementation of mean wind speed is a possible improvement for the representation of sublimation in the ITGG model.es_ES
dc.descriptionArtículo en acceso abiertoes_ES
dc.description.abstractMenciona que la sublimación juega un papel decisivo en la energía de la superficie y el balance de masa de los glaciares tropicales. Señala además que durante la estación seca (de mayo a septiembre), la baja humedad específica y la gran rugosidad de la superficie favorecen la transición directa del hielo al vapor y reducen drásticamente la energía disponible para la fusión. Sin embargo, las mediciones de campo son escasas y se sabe poco acerca del rendimiento de las parametrizaciones de sublimación en los modelos de escorrentía y balance de masa de glaciares. Por ello, durante 15 días, en agosto de 2005, se midió la sublimación en la lengua de Glaciar Artesonraju en la Cordillera Blanca (Perú) utilizando lisímetros simples e indicando una fuerte dependencia de la rugosidad de la superficie, los totales diarios de sublimación varían de 1 a 3 kgm - 2 para suavizar a 2–5 kgm - 2 para condiciones ásperas.es_ES
dc.relation.ispartofseriesThe Cryosphere, 2009, Volumen 3, pp 21-30es_ES
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.sourceAutoridad Nacional del Aguaes_ES
dc.sourceRepositorio institucional - ANAes_ES
dc.subjectCambio climáticoes_ES
dc.subjectConservación de glaciareses_ES
dc.subjectMonitoreo de lagunas y glaciareses_ES
dc.titleMeasured and modelled sublimation on the tropical Glaciar Artesonraju, Perúes_ES

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