 |
| Titel |
The response of the terrestrial biosphere to urbanization: land cover conversion, climate, and urban pollution |
| VerfasserIn |
K. Trusilova, G. Churkina |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-11-04), S.1505-1515 |
| Datensatznummer |
250002918
|
| Publikation (Nr.) |
 copernicus.org/bg-5-1505-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
Although urban areas occupy a relatively small fraction of land, they
produce major disturbances of the carbon cycle through land use change,
climate modification, and atmospheric pollution. In this study we quantify
effects of urban areas on the carbon cycle in Europe. Among
urbanization-driven environmental changes, which influence carbon
sequestration in the terrestrial biosphere, we account for: (1) proportion of
land covered by impervious materials, (2) local urban meteorological
conditions, (3) urban high CO2 concentrations, and (4) elevated
atmospheric nitrogen deposition. We use the terrestrial ecosystem model
BIOME-BGC to estimate fluxes of carbon exchange between the biosphere and
the atmosphere in response to these urban factors.
We analysed four urbanization-driven changes individually, setting up our
model in such a way that only one of the four was active at a time. From
these model simulations we found that fertilization effects from the
elevated CO2 and the atmospheric nitrogen deposition made the strongest
positive contributions to the carbon uptake (0.023 Pg C year−1 and
0.039 Pg C year−1, respectively), whereas, the impervious urban land
and local urban meteorological conditions resulted in a reduction of carbon
uptake (−0.005 Pg C year−1 and −0.007 Pg C year−1,
respectively). The synergetic effect of the four urbanization-induced
changes was an increase of the carbon sequestration in Europe of 0.058 Pg C year−1. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|