Repositorio
Institucional

Fernandez, Alfonso

Somos-Valenzuela, Marcelo

Revisiting glacier mass-balance sensitivity to surface air temperature using a data-driven regionalization

CAMBRIDGE UNIV PRESS

JOURNAL OF GLACIOLOGY

en

This study involves examination of glaciological mass-balance time series, glacier and climatic descriptors, the application of machine learning methods for glaciological clustering, and computation of mass-balance time series based upon the clustering and statistical analyses relative to gridded air temperature datasets. Our analysis revealed an increasingly coherent mass-balance trend but a latitudinal bias of monitoring programs. The glacier classification scheme delivered three clusters, suggesting these correspond to climate-based first-order regimes, as glacier morphometric characteristics weighed little in our multivariate analysis. We combined all available surface mass-balance data from in situ monitoring programs to study temperature sensitivity for each cluster. These aggregated mass-balance time series delivered spatially different statistical relationships to temperature. Results also showed that surface mass balance tends to have a temporal self-correlation of similar to 20 years. Using this temporal window to analyze sensitivity since similar to 1950, we found that in all cases temperature sensitivity, while generally negative, tended to fluctuate through time, with the largest absolute magnitudes occurring in the 1980s and becoming less negative in recent years, revealing that glacier sensitivity is non-stationary. These findings point to a scenario of a coherent signal of change no matter the glacier regime. This work provides new insights into glacier-climate relationships that can guide observational and analytical strategies.

artículo original

We are funded by the Chilean Science Council (ANID): FONDECYT Regular grant No1201429 and Anillo ACT210080. We also acknowledge all the open databases developed by the WGMS. This work is also a tribute to the hundreds of groups gathering, curating and sharing mass-balance and inventory data for more than a century. We are grateful to Mario Pino for early discussions on this work, Bryan Mark for last-minute revisions of the language style, and to the editors and reviewers.

Contamos con financiamiento del Consejo Científico de Chile (ANID): FONDECYT Beca Regular No1201429 y Anillo ACT210080. También reconocemos todas las bases de datos abiertas desarrolladas por el WGMS. Este trabajo es también un tributo a los cientos de grupos que recopilan, curan y comparten datos de inventario y balance de masas durante más de un siglo. Agradecemos a Mario Pino por las primeras discusiones sobre este trabajo, a Bryan Mark por las revisiones de último momento del estilo del lenguaje, y a los editores y revisores.

10.1017/jog.2022.16

PDF

Climate change

glacier mass balance

ice and climate

SEA-LEVEL RISE

PRINCIPAL COMPONENT ANALYSIS

ICE CAPS

CLIMATE

INVENTORY

ALPS

Geografía Física

Geociencias

Multidisciplinario

Cambio climático

equilibrio de masa de los glaciares

hielo y clima

AUMENTO DEL NIVEL DEL MAR

ANÁLISIS DE COMPONENTES PRINCIPALES

CAPAS DE HIELO

CLIMA

INVENTARIO

ALPS

Revisiting glacier mass-balance sensitivity to surface air temperature using a data-driven regionalization

1041

1060

artículo original

version publicada

CC BY 4.0

CC BY 4.0

acceso abierto

acceso abierto

ANID-FONDECYT 1201429

ANID-ANILLO ACT210080

ANID FONDECYT 1201429

ANID ANILLO ACT210080

WOS:000780914300001