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Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic)
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Orientador(es)
Resumo(s)
The Antarctic Peninsula (AP) region has been one of the regions on Earth with strongest
warming since 1950. However, the northwest of the AP showed a cooling from 2000 to 2015, which had
local consequences with an increase in snow accumulation and a deceleration in the loss of mass
from glaciers. In this paper, we studied the e ects of increased snow accumulation in the permafrost
thermal regime in two boreholes (PG1 and PG2) in Livingston Island, South Shetlands Archipelago,
from 2009 to 2015. The two boreholes located c. 300 m apart but at similar elevation showed di erent
snow accumulation, with PG2 becoming completely covered with snow all year long, while the
other remained mostly snow free during the summer. The analysis of the thermal regimes and of
the estimated soil surface energy exchange during the study period showed the e ects of snow
insulation in reducing the active layer thickness. These e ects were especially relevant in PG2,
which transitioned from a subaerial to a subnival regime. There, permafrost aggraded from below,
with the active layer completely disappearing and the e ciency of thermal insulation by the snowpack
prevailing in the thermal regime. This situation may be used as an analogue for the transition from a
periglacial to a subglacial environment in longer periods of cooling in the paleoenvironmental record.
Descrição
Palavras-chave
Permafrost Active layer Snow thickness Enthalpy
Contexto Educativo
Citação
Ramos, M., Vieira, G., de Pablo, M. A., Molina, A. & Jimenez, J.J. (2020). Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic). Atmosphere, 11(12), 1332. https://doi.org/10.3390/atmos11121332
Editora
MDPI