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Accession: ORG-GCET-1904 Research Theme: Organic Matter/Decomposition (Graduate Thesis Study)
Contributors: Patricia M. Medeiros, Maria Letourneau
Title: DOM composition changes in Altamaha River and Sapelo Sound estuaries measured by FT-ICR mass spectrometry from September 2015 to September 2016
Abstract: Dissolved organic matter (DOM) is a large and complex mixture of compounds with source inputs that differ with location, season and environmental conditions. Here, we investigated drivers of DOM composition changes in a marsh-dominated estuary off the southeastern U.S. Monthly water samples were collected at a riverine and estuarine site from September 2015 to September 2016, and bulk, optical, and molecular analyses were conducted on samples before and after dark incubations. Results showed that river discharge was the primary driver changing the DOM composition at the mouth of the Altamaha River. For discharge higher than ~ 150 m3 s-1, DOC concentrations and the terrigenous character of the DOM increased approximately linearly with river flow. For low discharge conditions, a clear signature of salt marsh-derived compounds was observed in the river. At the head of Sapelo Sound, changes in DOM composition were primarily driven by river discharge and possibly by summer algae blooms. Microbial consumption of DOC was larger during periods of high discharge at both sites, potentially due to the higher mobilization and influx of fresh material to the system. The Georgia coast was hit by Hurricane Matthew in October 2016, which resulted in a large input of carbon to the estuary. The DOC concentration was ~ 2 times higher and DOM composition was more aromatic with a stronger terrigenous signature compared to the seasonal maximum observed earlier in the year during peak river discharge conditions. This suggests that extreme events notably impact DOM quantity and quality in estuarine regions.
DOI: (not assigned)
Key Words: Altamaha River, biogeochemistry, carbon, carbon cycling, dissolved organic carbon, DOM, estuaries, hydrology, rivers, Sapelo Sound, spectroscopy, terrigenous
LTER Core Area: Organic Matter
Research Themes: Organic Matter/Decomposition, Chemistry
Study Period: 15-Sep-2015 to 11-Sep-2016
Study Sites:
GCE1 -- Eulonia, Georgia, USA
GCE-AL -- Altamaha River, Georgia, USA
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Publications:

Letourneau, M.L. and Medeiros, P.M. 2019. Dissolved organic matter composition in a marsh-dominated estuary: Response to seasonal forcing and to the passage of a hurricane. Journal of Geophysical Research: Biogeosciences. 124:1545-1559. (DOI: 10.1029/2018JG004982)

Downloads: Information

Data Table: ORG-GCET-1904 ( Physical and chemical variables at sampling sites collected over one year in the Altamaha River and Sapelo Sound, 27 records)

Access: GCE Members only (public release on 11-Apr-2020)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [2.64kb],  Text File [2.06kb],  MATLAB (GCE Toolbox) [19.16kb],  MATLAB (Variables) [19.90kb],  Text Report [17.36kb]

Column List:(display)


Data Table: ORG-GCET-1904_Alt_MarToSept (FT-ICR data from Altamaha River Samples Mar. - Sept. 2016, 666920 records)

Access: GCE Members only (public release on 11-Apr-2020)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [47880.02kb],  Text File [43971.79kb],  MATLAB (GCE Toolbox) [15273.90kb],  MATLAB (Variables) [15273.61kb],  Text Report [48435.51kb]

Column List:(display)


Data Table: ORG-GCET-1904_Alt_SepToFeb (FT-ICR data from Altamaha River Samples Sept. 2015 - Feb. 2016, 611008 records)

Access: GCE Members only (public release on 11-Apr-2020)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [43886.33kb],  Text File [40305.71kb],  MATLAB (GCE Toolbox) [13999.05kb],  MATLAB (Variables) [13998.68kb],  Text Report [44387.19kb]

Column List:(display)


Data Table: ORG-GCET-1904_Sap_MarToSept (FT-ICR data from Sapelo Sound Samples Mar. - Sept. 2016, 593940 records)

Access: GCE Members only (public release on 11-Apr-2020)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [41453.64kb],  Text File [37973.03kb],  MATLAB (GCE Toolbox) [13584.58kb],  MATLAB (Variables) [13584.01kb],  Text Report [41937.86kb]

Column List:(display)


Data Table: ORG-GCET-1904_Sap_SepToFeb (FT-ICR data from Sapelo Sound Samples Sept. 2015 - Feb. 2016, 641327 records)

Access: GCE Members only (public release on 11-Apr-2020)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [44786.48kb],  Text File [41028.21kb],  MATLAB (GCE Toolbox) [14675.13kb],  MATLAB (Variables) [14674.48kb],  Text Report [45316.98kb]

Column List:(display)

Citation: Medeiros, Patricia M. 2019. DOM composition changes in Altamaha River and Sapelo Sound estuaries measured by FT-ICR mass spectrometry from September 2015 to September 2016. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://gce-lter.marsci.uga.edu/data/ORG-GCET-1904

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959, OCE-1237140 and OCE-1832178. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.