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      A high-accuracy map of global terrain elevations : Accurate Global Terrain Elevation map

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          Outgassing from Amazonian rivers and wetlands as a large tropical source of atmospheric CO2.

          Terrestrial ecosystems in the humid tropics play a potentially important but presently ambiguous role in the global carbon cycle. Whereas global estimates of atmospheric CO2 exchange indicate that the tropics are near equilibrium or are a source with respect to carbon, ground-based estimates indicate that the amount of carbon that is being absorbed by mature rainforests is similar to or greater than that being released by tropical deforestation (about 1.6 Gt C yr-1). Estimates of the magnitude of carbon sequestration are uncertain, however, depending on whether they are derived from measurements of gas fluxes above forests or of biomass accumulation in vegetation and soils. It is also possible that methodological errors may overestimate rates of carbon uptake or that other loss processes have yet to be identified. Here we demonstrate that outgassing (evasion) of CO2 from rivers and wetlands of the central Amazon basin constitutes an important carbon loss process, equal to 1.2 +/- 0.3 Mg C ha-1 yr-1. This carbon probably originates from organic matter transported from upland and flooded forests, which is then respired and outgassed downstream. Extrapolated across the entire basin, this flux-at 0.5 Gt C yr-1-is an order of magnitude greater than fluvial export of organic carbon to the ocean. From these findings, we suggest that the overall carbon budget of rainforests, summed across terrestrial and aquatic environments, appears closer to being in balance than would be inferred from studies of uplands alone.
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            Mapping forest canopy height globally with spaceborne lidar

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              TanDEM-X: A Satellite Formation for High-Resolution SAR Interferometry

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                Author and article information

                Journal
                Geophysical Research Letters
                Geophys. Res. Lett.
                Wiley
                00948276
                June 16 2017
                June 16 2017
                June 14 2017
                : 44
                : 11
                : 5844-5853
                Affiliations
                [1 ]Department of Integrated Climate Change Projection Research; Japan Agency for Marine-Earth Science and Technology; Yokohama Japan
                [2 ]Institute of Industrial Sciences; University of Tokyo; Tokyo Japan
                [3 ]Department of Civil and Environmental Engineering; Tokyo Institute of Technology; Tokyo Japan
                [4 ]Institute of Space and Astronautical Science; Japan Aerospace Exploration Agency; Sagamihara Japan
                [5 ]UCD School of Civil Engineering; University College Dublin; Dublin Ireland
                [6 ]School of Geographical Sciences; University of Bristol; Bristol UK
                [7 ]SSBN; Bristol UK
                Article
                10.1002/2017GL072874
                8e717d27-2826-46da-9ca1-f0652f379384
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://creativecommons.org/licenses/by-nc-nd/4.0/


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