Georgia Coastal Ecosystems LTER Data Set Details

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GCE-LTER Data Set Summary

Accession:

ORG-GCED-1801

Research Theme:

Organic Matter/Decomposition (Directed Study)

Contributors:

Patricia M. Medeiros, Meg Babcock-Adams, Michael Seidel, Renato Castelao, Daniela Di Iorio, Tim Hollibaugh, Thorsten Dittmar

Title:

Seasonal Evolution of Terrigenous Dissolved Organic Matter in the South Atlantic Bight off Georgia in 2014

Abstract:

Six surveys of the central South Atlantic Bight (SAB) off of Georgia were conducted in 2014. The primary objective of the research cruises was to characterize estuary-shelf exchange and the dispersal of freshwater into the coastal ocean around Sapelo Island off the Georgia coast. The surveys, in April, May, July, August, September, and November, were intended to sample shelf conditions under different seasons. Most of the sampling stations were located at the mouth of the estu-aries around Sapelo Island and over the inner and mid-shelf (<60 km offshore). Eighty samples from transects extending across the shelf from the mouths of the Altamaha River and of Sapelo Sound were selected for the analyses of molecular composition using ultrahigh resolution mass spectrometry (Fourier transform ion cyclotron reso-nance mass spectrometry [FT-ICR MS]) and stable carbon iso-topic signatures (delta 13C). This data set includes spectral analysis of the DOM, including spectral slope (275-295nm wavelength), terrigenous peaks from mass spectrometry analysis, and a computed terrigenous index indicating fraction of terrigenous DOM in water samples.

DOI:

10.6073/pasta/b971b986733d0ea80477aed5c8f2e038

Key Words:

carbon, Continental Shelf, cruise, dissolved organic carbon, dissolved organic matter, estuaries, isotope analysis, mass spectrometry, nutrients, organic matter, South Atlantic Bight

LTER Core Area:

Organic Matter

Research Themes:

Organic Matter/Decomposition

Study Period:

02-Apr-2014 to 07-Nov-2014

Study Sites:

GCE-OS -- Off-shore Transect, Georgia, USA

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Publications:

Medeiros, P.M., Babcock-Adams, L., Seidel, M., Castelao, R., Di Iorio, D., Hollibaugh, J.T. and Dittmar, T. 2017. Export of terrigenous dissolved organic matter in a broad continental shelf. Limnology & Oceanography. 62:1718-1731. (DOI: 10.1002/lno.10528)

Downloads:

Data Table: ORG-GCED-1801 (Main data table for data set ORG-GCED-1801, 100 records)

Access: Public (released 18-Jan-2018)

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

Data Formats: Spreadsheet (CSV) [6.40kb], Text File [5.95kb], MATLAB (GCE Toolbox) [121.37kb], MATLAB (Variables) [NaNkb], Text Report [22.77kb]

Column List:(hide)

Column	Name	Units	Type	Description
1	Date	YYYY-MM-DD	string	Calendar date of sample collection
2	Longitude	degrees	floating-point	Geographic longitude of sampling station
3	Latitude	degrees	floating-point	Geographic latitude of sampling station
4	Salinity	PSU	floating-point	Salinity of the water sample
5	S275-295	1/nm	floating-point	Spectral slope coefficient between 275 and 295 nm estimated using a nonlinear exponential fit to the absorption coefficients in that range
6	t-Peaks_Occurrance	%	floating-point	Percent occurrance of terrigenous peaks in the Fourier transform ion cyclotron resonance mass spectrometry signal
7	t-Peaks_Abundance	%	floating-point	Percent abundance of terrigenous peaks in the Fourier transform ion cyclotron resonance mass spectrometric signal
8	Iterr	ratio	floating-point	Terrigenous index based on the ratio of the relative abundances of molecular formulae that were strongly correlated with del 13C stable isotope signatures. The ratio Iterr = Terr /(Terr + Mar), where Mar and Terr are the sum of the FT-ICR MS signal intensity of 40 molecular formulae that are strongly correlated positively and negatively with del 13 C signatures, respectively.

Statistics:

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Citation:

Medeiros, Patricia M. 2018. Seasonal Evolution of Terrigenous Dissolved Organic Matter in the South Atlantic Bight off Georgia in 2014. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/b971b986733d0ea80477aed5c8f2e038

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