Este trabajo presenta una metodología que permite estimar los espesores del hielo actual (2016) en función al modelamiento de la topografía subglaciar aplicando la herramienta Glaciar Reconstruction (GLABTOP). Así mismo, se complementa el desarrollo de Glacier Reconstruction (GLARE) que consiste en reconstruir los paleoglaciares (1962 y PEH), esta última a través de morrenas dejadas por los glaciares en el pasado.

The 58% of Peru's population lives in the arid Pacific coastal region and is highly dependent on the availability of Andean snowmelt water, both for human consumption and for power generation and other economic activities. Tropical glaciers are sensitive indicators of climate change, the impact of which has been reflected in the reduction of glacier areas and volumes. In this paper we present an assessment of the deglaciation and glacial record of temperature increase (°C) in the Llanganuco basin (Cordillera Blanca, Peru) since the end of the Little Ice Age (LIA; ~1850). Deglaciation has been evaluated by reconstructing 2D and 3D glacier surfaces; whereas, the increase in air temperature was deduced from the difference in the Altitude of the Equilibrium Lines in each period analyzed (LIA final, 1962 and 2016). From the Little Ice Age - 1962, the area deglaciated was ~13 km 2 (30% reduct...

La cobertura nival y glaciar de los volcanes Chachani y Coropuna ha experimentado un rápido retroceso en las últimas décadas debido al cambio climático. Este trabajo tiene como objetivo analizar la relación entre la cobertura nival y el albedo en Chachani y Coropuna, y fenómeno El Niño Oscilación Sur (ENSO) mediante imágenes de alta resolución temporal y baja resolución espacial. La técnica desarrollada en el procesamiento de imágenes ha permitido extraer información relaciona con las anomalías de variables climáticas mediante filtros en el dominio temporal y de frecuencia. Los resultados de las correlaciones muestran periodos alrededor de tres años relacionando al fenómeno ENSO con la cobertura nival en las áreas de estudio.

The Andes Mountain range runs along the western margin of South America for ~7500 km, from the Sierra Nevada de Santa Marta, next to the Caribbean Sea, to Cape Horn, at the southern tip of the continent. Based on structural differences, the Northern Andes (11ºN-1ºS), Central Andes (1º-47ºS) and Southern Andes (47º-68ºS) have been differentiated. In the Central Andes the mountain range is divided into Western and Eastern Andes, between which the Altiplano, a plateau of 300x500 km and 3800- 4900 m surrounded by peaks that reach 6000 m in altitude. Only the Himalayas and Tibet are higher and larger than Andes-Altiplano. Glaciers are preserved on many peaks of the Andes, and on their slopes, there are moraines revealing a much larger glacial extent in the past. Today, in the deglaciated areas there are extensive periglacial landscapes. However, the extent to which altitude and latitude...

Este trabajo es un ensayo para evaluar la deglaciación de la cuenca Paltay (9°22’S; 77º22’W) en 2100, suponiendo cuatro escenarios de calentamiento global para ese año: +1 °C, +2 °C, +3 °C y +4 °C. El ensayo se realizó a lo largo de cuatro fases: Fase 1) Cálculo del BR en un glaciar de referencia, Artesonraju (8°56’S; 77º38’W), próximo al área de estudio de este trabajo. Dicho cálculo se realizó mediante el producto BR=b·z·s, donde BR es el Balance Ratio; b el balance de masa 2004-2014 (mm) medido en el campo; z la altitud media (m s.n.m.) y s la superficie (m2 ) de cada banda altitudinal del glaciar (con intervalos de 100 m). De ese modo se estimó un valor BR=2.3. Fase 2) Delimitación de los glaciares de la cuenca Paltay en 2016 y reconstrucción de su altitud de la línea de equilibrio (ELA, msnm). Con esa finalidad se utilizó la herramienta programada por ...

The evaluation of presence and origin of ground-ice in the non-glaciated peripheral areas of Nevado Corpuna can contribute to a more refined estimation of its real extent, as well as of the ongoing and recent transformation processes (i.e. permafrost aggradation/degradation). We carried out GPR surveys in sectors immediately outside the glacial tongues which diverge from the glaciated area, both on rock glaciers and debris-covered glaciers. The data acquisition was made with an unshielded antenna operating at a central frequency of 25 MHz, and according longitudinal and cross profiles. We defined a processing sequence particularly effective in removing in air-reflections generated by isolated blocks on the surface, and the numerous point-source diffractions. The signal-to-noise ratio consents a data imaging interpretable up to 25-30 m of depth, according to the estimated velocity of GPR ...

The Equilibrium Line Altitude (ELA, m) is a good indicator for the impact of climate change on tropical glaciers , because it varies in time and space depending on changes in temperature and/or precipitation.The estimation of the ELA and paleoELA using the Area x Altitude Balance Ratio method (AABR; Osmaston, 2005) requires knowing the surface and hypsometry of glaciers or paleoglaciers (Benn et al. 2005) and the Balance Ratio (BR) correct (Rea, 2009). In the Llanganuco basin (~ 9°3´S; 77°37´W) there are very well preserved moraines near the current glaciers front. These deposits provide information to reconstruct the extent of paleoglaciers since the Little Ice Age (LIA) and deduce some paleo-climatic variables. The goal of this work has been to reconstruct the paleotemperature (°C) during LIA, deduced from the difference between ELA AABR2016 and paleoELA AABRLIA. The paleoclimatic...