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Conference Paper

Interannual changes in glacier mass balance as a response to the recent climate variability in the Tropical Andes

Authors

Basantes,  Ruben
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vincent,  Christian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rabatel,  Antoine
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Escalante,  Viviana
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Loarte,  Edwin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Davila,  Luzmila
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Soruco,  Alvaro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gualapuro,  Moises
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cruz,  Rolando
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Basantes, R., Vincent, C., Rabatel, A., Escalante, V., Loarte, E., Davila, L., Soruco, A., Gualapuro, M., Cruz, R. (2023): Interannual changes in glacier mass balance as a response to the recent climate variability in the Tropical Andes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3555


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020315
Abstract
In the Tropical Andes, a wide range of topographic and climatic settings results in a large diversity of glaciers distributed over mountain ranges and volcanoes. Previous studies, based on geodetic estimations, show that glaciers in this region have lost mass at a rate of -0.50 m w.e. yr-1 during the last two decades. At the interannual time step, efforts to understand the mass balance variability as a direct response to the Andean climate, have been constrained by the number of available observations and a variety of interpolation approaches used to compute the glaciological mass balances. Thanks to the availability of point mass balance on seven tropical glaciers, we assess the annual signal of the surface mass balances during the 1990-2020 period. Thus, glaciers in the inner tropics are subjected to a less pronounced mass loss of -0.35 m w.e. yr-1, while glaciers in the outer tropics exhibit a mass balance of -0.55 m w.e. yr-1. Our results suggest that this contrasting behavior may be related to the latitudinal location and elevation of glaciers. The interannual cycles captured by the point mass balance correlate with climate variability and periodical patterns as El Niño Southern Oscillation. Although its behavior depends on the climatic conditions at the regional scale and the local topography, on the whole, glaciers are shrinking throughout the region with negative consequences in terms of water availability for Andean countries.