![Hier klicken, um den Treffer aus der Auswahl zu entfernen](images/unchecked.gif) |
Titel |
Uncertainties in modelling CH4 emissions from northern wetlands in glacial climates: effect of hydrological model and CH4 model structure |
VerfasserIn |
C. Berrittella, J. Huissteden |
Medientyp |
Artikel
|
Sprache |
Englisch
|
ISSN |
1814-9324
|
Digitales Dokument |
URL |
Erschienen |
In: Climate of the Past ; 5, no. 3 ; Nr. 5, no. 3 (2009-07-21), S.361-373 |
Datensatznummer |
250002539
|
Publikation (Nr.) |
copernicus.org/cp-5-361-2009.pdf |
|
|
|
Zusammenfassung |
Methane (CH4) fluxes from northern wetlands may have influenced
atmospheric CH4 concentrations at climate warming phases during the
last 800 000 years and during the present global warming. Including these
CH4 fluxes in earth system models is essential to understand feedbacks
between climate and atmospheric composition.
Attempts to model CH4 fluxes from wetlands have previously been
undertaken using various approaches. Here, we test a process-based wetland
CH4 flux model (PEATLAND-VU) which includes details of soil-atmosphere
CH4 transport. The model has been used to simulate CH4 emissions
from continental Europe in previous glacial climates and the current
climate.
This paper presents results regarding the sensitivity of modeling glacial
terrestrial CH4 fluxes to (a) basic tuning parameters of the model, (b)
different approaches in modeling of the water table, and (c) model
structure. In order to test the model structure, PEATLAND-VU was compared to
a simpler modeling approach based on wetland primary production estimated
from a vegetation model (BIOME 3.5). The tuning parameters are the CH4
production rate from labile organic carbon and its temperature sensitivity.
The modelled fluxes prove comparatively insensitive to hydrology
representation, while sensitive to microbial parameters and model structure.
Glacial climate emissions are also highly sensitive to assumptions about the
extent of ice cover and exposed seafloor. Wetland expansion over low relief
exposed seafloor areas have compensated for a decrease of wetland area due
to continental ice cover. |
|
|
Teil von |
|
|
|
|
|
|