Monitoring seasonal snow dynamics using ground based high resolution photography Austre Lovenbreen, Svalbard, 79°NReportar como inadecuado

Monitoring seasonal snow dynamics using ground based high resolution photography Austre Lovenbreen, Svalbard, 79°N - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 ThéMA - Théoriser et modéliser pour aménager 2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies 3 GEODE - Géographie de l-environnement 4 Université Paris Sud 5 GEOPS - Géosciences Paris Sud

Abstract : Arctic glaciers are reliable indicators of global climate changes. However, monitoring snow and ice dynamics in Arctic regions is challenging: some fast but key events can be missed since they are short in time but significant in the hydrological budget. In the context of long term monitoring with high temporal and spatial resolutions of the snow cover dynamics, automated digital cameras were installed around the Austre Lovénbreen glacier basin Spitsbergen, Norway, 79 N. Despite data losses due to rough weather conditions and control electronics failure, a dataset of 2411 pictures out of an expected 3294 was gathered over a 1 year hydrological period to assess the snow coverage of the glacier as a function of time with daily resolution. 73% of the total number of expected images was thus recorded, with gaps associated with temporary electronics or data storage failure. The six camera stations oriented so as to observe the glacier itself provide a surface coverage of 96%. Furthermore, geometric corrections of the pictures, using reference ground control points located on the glacier through GPS receivers, yield a quantitative information from initially qualitative images. Projecting the resulting mosaic of the images gathered from six cameras on a GIS allows for the precise monitoring of ice-related processes, and especially the snow coverage evolution over time. This paper summarizes our current understanding of such dynamics, based on the analysis of daily mosaics of images allowing for the observation of both long term evolution on the seasonal scale and the short term events on a weekly scale. Such results demonstrated over one typical full hydrological season April-October 2009 that snow coverage evolves following discrete steps, either due to water precipitation or warm events, with a snow coverage ranging from 100% april to 37% September

Keywords : Svalbard Digital camera In situ sensing Geometric correction Ground based camera Snow cover dynamics Glacier High temporal resolution

Autor: Eric Bernard - Jean-Michel Friedt - Florian Tolle - Madeleine Griselin - Gilles Martin - Dominique Laffly - Christelle Marlin -



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