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Accession: ORG-GCED-2208 Research Theme: Organic Matter/Decomposition (Directed Study)
Contributor: Patricia M. Medeiros
Title: DOM composition in Altamaha River and Sapelo Sound estuaries measured by FT-ICR mass spectrometry in 2017 (April, July, October) and 2018 (January and October)
Abstract: Extreme events such as hurricanes and tropical storms often result in large fluxes of dissolved organic carbon (DOC) to estuaries. Precipitation associated with tropical storms may be increasing in the southeastern U.S., which can potentially impact dissolved organic matter (DOM) dynamics and cycling in coastal systems. Here, DOM composition at the Altamaha River and Estuary (Georgia, U.S.A.) was investigated over multiple years capturing seasonal variations in river discharge, high precipitation events, and the passage of two hurricanes which resulted in substantial storm surges. Optical measurements of DOM indicate that the terrigenous signature in the estuary is linearly related to freshwater content and is similar after extreme events with or without a storm surge and during peak river flow. Molecular level analysis revealed significant differences, however, with a large increase of highly aromatic compounds after extreme events exceeding what would be expected by freshwater content alone. Although extreme events are often followed by increased DOC biodegradation, the terrigenous material added during those events does not appear to be more labile than the remainder of the DOM pool that was captured by ultrahigh-resolution mass spectrometry analysis. This suggests that the added terrigenous organic matter may be exported to the coastal ocean, while a fraction of the organic matter that co-varied with the terrigenous DOM may contribute to the increased biomineralization in the estuary, with implications to carbon processing in coastal areas.
DOI: 10.6073/pasta/c0238aed6c397414f5925aff9f4a19ad
Key Words: Altamaha River, biogeochemistry, carbon, carbon cycling, dissolved organic carbon, DOM, estuaries, hurricanes, hydrology, rivers, Sapelo Sound, storms
LTER Core Area: Organic Matter
Research Themes: Organic Matter/Decomposition, Chemistry
Study Period: 01-Apr-2017 to 31-Oct-2018
Study Sites:
GCE1 -- Eulonia, Georgia, USA
GCE7 -- Carrs Island, Georgia, USA
» Download Geographic Coverage: Google Earth
Data References: ORG-GCET-1904 (FT-ICR mass spectrometry from September 2015 to September 2016)
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)

Letourneau, M.L., Schaefer, S.C., Chen, H., McKenna, A.M., Alber, M. and Medeiros, P.M. 2021. Spatio-temporal changes in dissolved organic matter composition along the salinity gradient of a marsh-influenced estuarine complex. Limnology & Oceanography. 66:3040-3054. (DOI: 10.1002/lno.11857)

Medeiros, P.M. 2022. The effects of hurricanes and storms on the composition of dissolved organic matter in a southeastern U.S. estuary. Frontiers in Marine Science. 9:855720. (DOI: 10.3389/fmars.2022.855720)

Downloads: Information

Data Table: ORG-GCED-2208 (Physical variables at sampling sites, 12 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1.16kb],  Text File [0.69kb],  MATLAB (GCE Toolbox) [16.98kb],  MATLAB (Variables) [16.75kb],  Text Report [12.05kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Apr_2017_T0 (FT-ICR data from Altamaha River Samples April 2017, 30579 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1853.31kb],  Text File [1673.68kb],  MATLAB (GCE Toolbox) [407.36kb],  MATLAB (Variables) [406.07kb],  Text Report [1853.95kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Jan_2018_T0 (FT-ICR data from Altamaha River Samples January 2018, 21372 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1295.91kb],  Text File [1170.22kb],  MATLAB (GCE Toolbox) [291.75kb],  MATLAB (Variables) [290.70kb],  Text Report [1296.55kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Jul_2017_T0 (FT-ICR data from Altamaha River Samples July 2017, 25281 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1532.32kb],  Text File [1383.73kb],  MATLAB (GCE Toolbox) [338.91kb],  MATLAB (Variables) [338.30kb],  Text Report [1533.02kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Oct_2017_T0 (FT-ICR data from Altamaha River Samples October 2017, 23322 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1413.58kb],  Text File [1276.47kb],  MATLAB (GCE Toolbox) [313.45kb],  MATLAB (Variables) [312.54kb],  Text Report [1414.22kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Oct_2018_T0A (FT-ICR data from Altamaha River Samples October 2018 Replicate A, 28679 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1738.01kb],  Text File [1569.51kb],  MATLAB (GCE Toolbox) [380.78kb],  MATLAB (Variables) [380.61kb],  Text Report [1738.66kb]

Column List:(display)


Data Table: ORG-GCED-2208_Alt_Oct_2018_T0B (FT-ICR data from Altamaha River Samples October 2018 Replicate B, 28247 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1712.07kb],  Text File [1546.10kb],  MATLAB (GCE Toolbox) [376.93kb],  MATLAB (Variables) [376.49kb],  Text Report [1712.71kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Apr_2017_T0 (FT-ICR data from Sapelo Sound Samples April 2017, 30179 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1769.59kb],  Text File [1592.30kb],  MATLAB (GCE Toolbox) [397.59kb],  MATLAB (Variables) [397.50kb],  Text Report [1770.23kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Jan_2018_T0 (FT-ICR data from Sapelo Sound Samples January 2018, 26420 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1549.45kb],  Text File [1394.19kb],  MATLAB (GCE Toolbox) [351.11kb],  MATLAB (Variables) [350.85kb],  Text Report [1550.10kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Jul_2017_T0 (FT-ICR data from Sapelo Sound Samples July 2017, 33763 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1979.68kb],  Text File [1781.39kb],  MATLAB (GCE Toolbox) [444.36kb],  MATLAB (Variables) [442.90kb],  Text Report [1980.32kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Oct_2017_T0 (FT-ICR data from Sapelo Sound Samples October 2017, 38353 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [2248.55kb],  Text File [2023.37kb],  MATLAB (GCE Toolbox) [497.88kb],  MATLAB (Variables) [497.58kb],  Text Report [2249.19kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Oct_2018_T0A (FT-ICR data from Sapelo Sound Samples October 2018 Replicate A, 19031 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1116.96kb],  Text File [1004.99kb],  MATLAB (GCE Toolbox) [262.23kb],  MATLAB (Variables) [262.23kb],  Text Report [1117.61kb]

Column List:(display)


Data Table: ORG-GCED-2208_Sap_Oct_2018_T0B (FT-ICR data from Sapelo Sound Samples October 2018 Replicate B, 22713 records)

Access: Public (released 28-Sep-2022)

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

Data Formats: Spreadsheet (CSV) [1332.58kb],  Text File [1199.03kb],  MATLAB (GCE Toolbox) [307.25kb],  MATLAB (Variables) [306.94kb],  Text Report [1333.22kb]

Column List:(display)

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Citation: Medeiros, Patricia M. 2022. DOM composition in Altamaha River and Sapelo Sound estuaries measured by FT-ICR mass spectrometry in 2017 (April, July, October) and 2018 (January and October). Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/c0238aed6c397414f5925aff9f4a19ad

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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.