INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Past and present permafrost distribution in the Southern Hemisphere ¡ª comparison of the GCM-based mapping with the observations.
KAZUYUKI SAITO ; DARIO TROMBOTTO
Congreso; Snow and Ice Conference; 2010
Due to relatively small portion of the terrestrial areas, the distribution of frozen ground (permafrost and seasonally-frozen ground) in the Southern Hemisphere has not been intensively surveyed and/or mapped. Saito et al. (2009) demonstrated that the frozen ground distribution on the large scale can reasonably be reconstructed through the mapping from the near-surface thermal conditions (i.e. freeze and thaw index, as the cumulative degree-day values below and above the freezing point, respectively), despite simplifications of the determining factors of permafrost in the reality. We attempt to apply the methodology to deduce the preliminary distribution maps of Southern Hemisphere frozen ground under the present-day and glacial climate, and compare them with the evidences obtained by observations.