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Soil and Permafrost studies

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Soil and Permafrost studies. Laxmi Sushama. Ouranos. Centre ESCER. Objective: ... thickness (ALT) and associated permafrost degradation can have adverse effects ... – PowerPoint PPT presentation

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Title: Soil and Permafrost studies


1
Soil and Permafrost studies
  • Laxmi Sushama
  • Ouranos
  • Centre ESCER

2
Objective
To model current and future soil thermal regimes
for the Arctic permafrost regions using CRCM
CLASS.
Motivation
Observed recent soil temperature changes at
high-latitudes suggest a deepening of the active
layer. This increase in the active layer
thickness (ALT) and associated permafrost
degradation can have adverse effects on the
socio-economic and eco-environmental systems.
Climate models used to study anticipated climate
changes suggest a likely rise in the average
global temperatures over the next century, with
maximal changes being projected for cold
high-latitude permafrost regions. These changes
in air temperature can lead to changes in the
soil thermal regime and permafrost regions can be
profoundly affected. Given these projections, an
evaluation of changes in the soil thermal regime
becomes desirable for a number of reasons
including assessments of possible ecosystem
responses and impacts on infrastructures.
Methodology
  • Offline simulation of the soil model (CLASS),
    driven by observed/analysed data.
  • The offline simulations are intended to validate
    the soil model/configuration.
  • Coupled CRCM/CLASS simulations.
  • Offline simulations have the limitation that they
    cannot capture the thermal and hydrologic
    feedbacks to the climate system Lawrence and
    Slater, 2005. Interactions between the
    atmosphere and the underlying surface are
    important, and determine the quality of many
    simulated near-surface variables.

3
Results from offline simulations with the
Goodrich soil model, driven by CRCM surface
temperature and snow cover
Simulated average ALT (m) for the continuous and
discontinuous permafrost zones and their
distributions for (a) current 1961-1990 and
future 2041-2070 periods.
4
Results from a coupled CRCM/CLASS simulation.
The version of CLASS used in this simulation is
only 4.1 m deep.
(b) The CRCM/CLASS simulated average annual
temperature (in C) for the 19611990 period and
(c) the CRCM/CLASS projected changes (in C) in
the mean annual temperature for the 20412070
period, for the top 10 cm of soil, for the
North-American permafrost regions taken from the
IPA map Brown et al., 2001 shown in (a).
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