In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 5, No. 1 ( 2015-10-23)
Abstract:
Carbon emissions to the atmosphere from inland waters are globally significant and mainly occur at tropical latitudes. However, processes controlling the intensity of CO 2 and CH 4 emissions from tropical inland waters remain poorly understood. Here, we report a data-set of concurrent measurements of the partial pressure of CO 2 (pCO 2 ) and dissolved CH 4 concentrations in the Amazon (n = 136) and the Congo (n = 280) Rivers. The pCO 2 values in the Amazon mainstem were significantly higher than in the Congo, contrasting with CH 4 concentrations that were higher in the Congo than in the Amazon. Large-scale patterns in pCO 2 across different lowland tropical basins can be apprehended with a relatively simple statistical model related to the extent of wetlands within the basin, showing that, in addition to non-flooded vegetation, wetlands also contribute to CO 2 in river channels. On the other hand, dynamics of dissolved CH 4 in river channels are less straightforward to predict and are related to the way hydrology modulates the connectivity between wetlands and river channels.
Type of Medium:
Online Resource
ISSN:
2045-2322
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2015
detail.hit.zdb_id:
2615211-3
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