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      Surface velocities of Upsala glacier, Southern Patagonian Andes, estimated using cross-correlation satellite imagery: 2013-2014 period Translated title: Velocidades superficiales del glaciar Upsala, Andes Patagónicos Sur, mediante el uso de correlación cruzada en imágenes satelitales: periodo 2013-2014

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          Abstract

          ABSTRACT In this study we present surface velocities estimation for the Upsala glacier catchment, South Patagonian Ice Field (SPI) during the summer season of years 2013 (January-March) and 2014 (March-April), including the Bertacchi, Cono, and Murallón tributaries using satellite images from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). The Cross-Correlation method was applied by COSI-Corr technique with sub-pixel accuracy. In general, it should be noted that the SPI glaciers, and Upsala glacier in particular, are fast-flowing ice bodies, which makes the technique works properly. Results of surface velocities estimation ranged from 0.22 to 2.93 md−1 for January-March 2013 and 0.12 to 5.8 md−1 for March-April 2014. In summary, COSI-Corr can achieved accurate and reliable results for glacier displacements and surface velocities estimation, also contributing in the better knowledge of the velocities change processes in time, taking into account Upsala is one of the most dynamic temperate glaciers of the SPI.

          Translated abstract

          RESUMEN En este estudio se presentan las estimaciones de velocidades superficiales de la cuenca del glaciar Upsala, Campo de Hielo Patagónico Sur (CHPS) durante la temporada de verano de los años 2013 (enero-marzo) y 2014 (marzo-abril), incluyendo los glaciares tributarios Bertacchi, Cono y Murallón utilizando imágenes satelitales ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer). El método de correlación cruzada se aplicó mediante la implementación de la técnica COSI-Corr, con una precisión a nivel de subpixel. Cabe destacar que los glaciares del CHPS, en general, y el glaciar Upsala, en particular, son cuerpos de hielo de flujo rápido, lo que hace que la técnica funcione correctamente. Los resultados de las velocidades superficiales oscilaron entre 0,22 a 2,93 md-1 para el periodo enero-marzo de 2013 y de 0,12 a 5,8 md-1 para el periodo marzo-abril de 2014. En resumen, COSI-Corr alcanzó resultados precisos y confiables para la estimación de desplazamientos y velocidades superficiales de los glaciares, contribuyendo al mejor conocimiento de los procesos de cambio de velocidades en el tiempo, teniendo en cuenta que Upsala es uno de los glaciares templados más dinámicos del CHPS.

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          Changes in the velocity structure of the Greenland Ice Sheet.

          Using satellite radar interferometry observations of Greenland, we detected widespread glacier acceleration below 66 degrees north between 1996 and 2000, which rapidly expanded to 70 degrees north in 2005. Accelerated ice discharge in the west and particularly in the east doubled the ice sheet mass deficit in the last decade from 90 to 220 cubic kilometers per year. As more glaciers accelerate farther north, the contribution of Greenland to sea-level rise will continue to increase.
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            Extracting a climate signal from 169 glacier records.

            I constructed a temperature history for different parts of the world from 169 glacier length records. Using a first-order theory of glacier dynamics, I related changes in glacier length to changes in temperature. The derived temperature histories are fully independent of proxy and instrumental data used in earlier reconstructions. Moderate global warming started in the middle of the 19th century. The reconstructed warming in the first half of the 20th century is 0.5 kelvin. This warming was notably coherent over the globe. The warming signals from glaciers at low and high elevations appear to be very similar.
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              Automatic and Precise Orthorectification, Coregistration, and Subpixel Correlation of Satellite Images, Application to Ground Deformation Measurements

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                andgeol
                Andean geology
                AndGeo
                Servicio Nacional de Geología y Minería (SERNAGEOMIN) (Santiago, , Chile )
                0718-7106
                January 2018
                : 45
                : 1
                : 87-103
                Affiliations
                [1] Mendoza orgnameInstituto Argentino de Nivología, Glaciología y Ciencias Ambientales orgdiv1Centro Científico Tecnológico orgdiv2CONICET Argentina smoraguesmendoza-conicet.gob.ar, mlenzanomendoza-conicet.gob.ar, anlovecchiomendoza-conicet.gob.ar, dfalaschimendoza-conicet.gob.ar, llenzano@ 123456mendoza-conicet.gob.ar
                Article
                S0718-71062018000100087
                10.5027/andgeov45n1-3034
                47d3f975-0471-43fa-bdc4-7f94c7c87450

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 22 September 2017
                : 12 January 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 67, Pages: 17
                Product

                SciELO Chile


                Velocidades superficiales,ASTER,Glaciar Upsala,Cross-correlation,COSI-Corr,Surface velocities,Upsala glacier,Correlación cruzada

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