Estimating Permafrost Active Layer Thickness (ALT) Biogeography over the Arctic Tundra

The geospatial model here presented estimates the permafrost active layer thickness (ALT) over the entire Arctic in the last 20 years, and it is based on the spatial and temporal oscillations measured by satellite-based essential variables associated with the thermal state of permafrost. The model i...

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Bibliographic Details
Published in:ECRS 2023
Main Authors: Emiliana Valentini, Marco Salvadore, Serena Sapio, Roberto Salzano, Giovanni Bormidoni, Andrea Taramelli, Rosamaria Salvatori
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2023
Subjects:
permafrost
active layer
model
Arctic amplification
tundra
greening
Environmental sciences
GE1-350
Active layer thickness
albedo
Tundra
Online Access:https://doi.org/10.3390/ECRS2023-15843
https://doaj.org/article/1cf60b2906ba46e5b7dde44efccf4406
Description
Summary:The geospatial model here presented estimates the permafrost active layer thickness (ALT) over the entire Arctic in the last 20 years, and it is based on the spatial and temporal oscillations measured by satellite-based essential variables associated with the thermal state of permafrost. The model integrates the climate and soil components, such as the land surface temperature, the snow depth water equivalent, and the mid-summer albedo, with the structural and functional descriptors of Arctic tundra biome such as the fraction of absorbed photosynthetically active radiation. The distribution of estimated ALT varies according to the vegetation classes (mosses and lichens or grasses and shrubs), but a general increase has been estimated across the whole Arctic tundra region, with rates of up to 2 cm/year.

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