Please use this identifier to cite or link to this item:
Title: Dissolved methane concentrations and fluxes to the atmosphere from a tropical floodplain lake
Authors: Barbosa, Pedro Maia
Melack, John M.
Amaral, João Henrique Fernandes
MacIntyre, Sally
Kasper, Daniele
Cortés, Alicia
Farjalla, Vinícius Fortes
Forsberg, Bruce Rider
Keywords: Carbon Cycle
Concentration (composition)
Environmental Factor
Estimation Method
Inland Sea
Lake Water
Spatio-temporal Analysis
Uncertainty Analysis
Issue Date: 2020
metadata.dc.publisher.journal: Biogeochemistry
metadata.dc.relation.ispartof: Volume 148, Número 2, Pags. 129-151
Abstract: Large uncertainties in estimates of methane (CH4) emissions from tropical inland waters reflect the paucity of information at appropriate temporal and spatial scales. CH4 concentrations, diffusive and ebullitive fluxes, and environmental parameters in contrasting aquatic habitats of Lake Janauacá, an Amazon floodplain lake, measured for two years revealed patterns in temporal and spatial variability related to different aquatic habitats and environmental conditions. CH4 concentrations ranged from below detection to 96 µM, CH4 diffusive fluxes from below detection to 2342 µmol m−2 h−1, and CH4 ebullitive fluxes from 0 to 190 mmol m−2 d−1. Vegetated aquatic habitats had higher surface CH4 concentrations than open water habitats, and no significant differences in diffusive CH4 fluxes, likely due to higher k values measured in open water habitats. CH4 emissions were enhanced after a prolonged low water period, when the exposed sediments were colonized by herbaceous plants that decomposed after water levels rose, possibly fueling CH4 production. Statistical models indicated the importance of variables related to CH4 production (temperature, dissolved organic carbon) and consumption (dissolved nitrogen, oxygenated water column), as well as maximum depth, in controlling surface water CH4 concentrations. © 2020, Springer Nature Switzerland AG.
metadata.dc.identifier.doi: 10.1007/s10533-020-00650-1
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.