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Methane flux from the central Amazonian floodplainA total of 186 methane measurements from the three primary Amazon floodplain environments of open water lakes, flood forests, and floating grass mats were made over the period 18 July through 2 September 1985. These data indicate that emissions were lowest over open water lakes. Flux from flooded forests and grass mats was significantly higher. At least three transport processes contribute to tropospheric emissions: ebullition from sediments, diffusion along the concentration gradient from sediment to overlaying water to air, and transport through the roots and stems of aquatic plants. Measurements indicate that the first two of these processes are most significant. It was estimated that on the average bubbling makes up 49 percent of the flux from open water, 54 percent of that from flooded forests, and 64 percent of that from floating mats. If the measurements were applied to the entire Amazonian floodplain, it is calculated that the region could supply up to 12 percent of the estimated global natural sources of methane.
Document ID
19880040042
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bartlett, Karen B.
(NASA Langley Research Center Hampton, VA, United States)
Crill, Patrick M.
(NASA Langley Research Center Hampton; College of William and Mary, Williamsburg, VA, United States)
Sebacher, Daniel I.
(NASA Langley Research Center Hampton, VA, United States)
Harriss, Robert C.
(NASA Langley Research Center Hampton, VA, United States)
Wilson, John O.
(NASA Langley Research Center Hampton, VA; U.S. Agency for International Development, Washington, DC, United States)
Date Acquired
August 13, 2013
Publication Date
February 20, 1988
Publication Information
Publication: Journal of Geophysical Research
Volume: 93
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A27269
Funding Number(s)
CONTRACT_GRANT: NSF BJR-85-0794
CONTRACT_GRANT: NCC1-82
Distribution Limits
Public
Copyright
Other

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