Please use this identifier to cite or link to this item:
https://repositorio.inpa.gov.br/handle/1/16792
Title: | Seasonal and spatial variability of CO 2 in aquatic environments of the central lowland Amazon basin |
Authors: | Amaral, João Henrique Fernandes Farjalla, Vinícius Fortes Melack, John M. Kasper, Daniele Scofield, Vinicius Barbosa, Pedro Maia Forsberg, Bruce Rider |
Issue Date: | 2019 |
metadata.dc.publisher.journal: | Biogeochemistry |
Abstract: | Different sources and processes contribute to pCO 2 and CO 2 exchange with the atmosphere in the rivers and floodplains of the Amazon basin. We measured or estimated pCO 2 , CO 2 fluxes with the atmosphere, planktonic community respiration (PCR), and environmental and landscape variables along the Negro and Amazon-Solimões rivers during different periods of the fluvial hydrological cycle. Values of pCO 2 ranged from 307 to 7527 μatm, while CO 2 fluxes ranged from − 9.3 to 1128 mmol m −2 d −1 in the Amazon-Solimões basin. In the Negro basin, pCO 2 values ranged from 648 to 6526 μatm, and CO 2 fluxes from 35 to 1025 mmol m −2 d −1 . In a general linear model including data from Negro and Amazon-Solimões basins, seasonal and spatial variation in flooded vegetated habitat area, dissolved oxygen, depth and water temperature explained 85% of surface pCO 2 variation. Levels of pCO 2 varied with inundation extent, with higher pCO 2 values occurring in periods with greater water depth and inundation area, and lower dissolved oxygen concentrations and water temperatures. In a separate analysis for the Amazon-Solimões river and floodplains, ecosystem type (lotic or lentic), hydrological period, water temperature, dissolved oxygen, depth and dissolved phosphorus explained 83% of pCO 2 variation. Our results demonstrate the influence of alluvial floodplains and seasonal variations in their limnological characteristics on the pCO 2 levels in river channels of the lowland Amazon. © 2019, Springer Nature Switzerland AG. |
metadata.dc.identifier.doi: | 10.1007/s10533-019-00554-9 |
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.