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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Carbon and alkalinity outwelling across the groundwater-creek-shelf continuum off Amazonian mangroves
Limnology and Oceanography Letters, Vol.6(6), pp.369-378
12/2021
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Abstract
Lateral fluxes (i.e., outwelling) of dissolved organic (DOC) and inorganic (DIC) carbon and total alkalinity were estimated using radium isotopes at the groundwater, mangrove creek, and continental shelf scales in the Amazon region. Observations of salinity and radium isotopes in the creek indicated tidally driven groundwater exchange as the main source of carbon. Radium-derived transport rates indicate that mangrove carbon is exported out of the continental shelf on timescales of 22 ± 7 d. Bicarbonate was the main form (82% ± 11%) of total dissolved carbon in all samples, followed by DOC (13% ± 12%) and CO2 (5% ± 4%). DIC (18.7 ± 15.7 mmol m−2 d−1) exceeded DOC (3.0 ± 4.1 mmol m−2 d−1) outwelling at all spatial scales. The interpretation of outwelling across the mangrove-ocean continuum is related to the spatial and temporal scales investigated. At all scales, outwelling represented a major coastal carbon pathway driving bicarbonate storage in the ocean.
Details
- Title
- Carbon and alkalinity outwelling across the groundwater-creek-shelf continuum off Amazonian mangroves
- Creators
- Alex Cabral - University of GothenburgThorsten Dittmar - University of OldenburgMitchell Call - Southern Cross UniversityJan Scholten - Christian-Albrechts-Universität zu KielCarlos E de Rezende - Universidade Estadual do Norte FluminenseNils Asp - Universidade Federal do ParáMartha Gledhill - GEOMAR Helmholtz Centre for Ocean Research KielMichael Seidel - University of OldenburgIsaac R Santos - University of GothenburgNaturvetenskapliga fakulteten
- Publication Details
- Limnology and Oceanography Letters, Vol.6(6), pp.369-378
- Publisher
- John Wiley & Sons, Inc.
- Number of pages
- 10
- Grant note
- This project was initiated with funding from the Australian Research Council and concluded with support from the Swedish Research Council to IRS. RV Meteor GEOTRACES cruise M147 was funded by the German Research Foundation (DFG). TD and MS received funding from the DFG-FAPERJ cooperative project (DI 842/6-1). CER received support from FAPERJ and CNPq. This study was financed in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES – Programa Pró-Amazônia: Biodiversidade e Sustentabilidade 001). NA is a CNPq research fellow.
- Identifiers
- 991012968352902368
- Copyright
- © 2021 The Authors. Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; National Marine Science Centre; Science
- Language
- English
- Resource Type
- Journal article