 |
| Titel |
Development of an advanced regional climate-ecosystem model for Arctic applications |
| VerfasserIn |
Nitin Chaudhary, Benjamin Smith, Paul Miller |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081167
|
|
|
|
|
|
| Zusammenfassung |
| Cryospheric processes together with their feedbacks play a crucial role in determining rates
and patterns of future warming over high-latitude regions. Cryospheric processes including
permafrost as well as peatland and associated vegetation, hydrological and biogeochemical
dynamics are not well represented in land surface schemes (LSS) of most climate models. As
a step in this direction, we describe a scheme to include the coupled dynamics of
vegetation, hydrology and peat accumulation under climate forcing within a detailed
vegetation dynamics-biogeochemistry model, LPJ GUESS (Smith et al. 2001; Miller
et al., in preparation). In the first step, a one-dimensional (1D) landscape scale
peat accumulation and two dimensional (2D) micro-topographical models have
been developed. For the parameterisation and validation of these models, good
quality datasets are being used which are collected at various locations around the
Arctic. Building on these, a three-dimensional (3D) scheme will be incorporated in a
version of LPJ-GUESS that already includes patch-scale vegetation dynamics and soil
carbon cycling, as well as a one-dimensional hydrology scheme. The patches in the
3D model will be treated as adjacent micro-patches in a grid and depending on
underlying micro-topography water will flow from higher to lower patches. The 2D
and 3D models will help in simulating hummock and hollow structure which is
typical for Northern peatlands based on the cyclic regeneration theory (von Post and
Sernander, 1910). The resulting models will be incorporated within the biospheric
component of a regional climate-ecosystem model, RCA-GUESS (Smith et al., 2010)
and used to investigate feedbacks related to the dynamics of peatlands, permafrost
and emissions of the greenhouse gases, mainly CO2 and CH4 across the Arctic
region.
References-
• Smith B, Prentice IC, and Skyes MT. 2001. Representation of vegetation dynamics in
modelling of European ecosystems: comparison of two contrasting approaches. Global
Ecology and Biogeography, Vol. 10, pp: 621-637.
• Smith B, Samuelsson P, Wramneby A, and Rummukainen M. 2010. A Model of the coupled
dynamics of climate, vegetation and terrestrial ecosystem biogeochemistry for regional
applications. Tellus, Vol: 63A, Issue: 1, pp: 87-106
• von Post L and Sernander R. 1910. Pflanzen-physiognomische Studien aus Torfmooren in
Närke. XI International Geological Congress: Excursion Guide No: 14(A7), Stockholm, pp:
48 |
|
|
|
|
|
|