Georgia Coastal Ecosystems LTER Data Set Details

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GCE-LTER Data Set Summary

Accession:

MSH-IRMA-1907

Research Theme:

Marsh Ecology (Research Study)

Contributor:

Christopher B. Craft

Title:

Methane and carbon dioxide flux in a tidal freshwater marsh recovering from three years of experimental seawater additions and following the Hurricane Irma storm surge

Abstract:

Methane (CH4) and carbon dioxide (CO2) flux rates were measured in a tidal freshwater marsh using static flux chambers. The experimental field site, SALTEx (Seawater Addition Long-Term Experiment) is part of the Georgia Coastal Ecosystems (GCE) LTER and is located on the Altamaha River, GA. The marsh was experimentally dosed with brackish water additions for 3 years, from 2014 - 2017. There are three treatments groups (Press, Pulse, and Fresh) and two control groups (with and without siding on the plots), each with six replicates. Press treatment plots received brackish water throughout the year, Pulse plots received brackish water in September and October and fresh water the rest of the year, Fresh plots received fresh river water throughout the year. The two control groups, one with siding on the plots and one without, received no water addition manipulations. All dosing ceased in January 2018, at which point we began to study the recovery of the marsh. In this study, the Hurricane Irma Rapid Grant evaluated additional effects of the Hurricane Irma storm surge that occurred in October 2017. Greenhouse gas measurements were taken seasonally beginning in March 2018 and ending in March 2019.

DOI:

10.6073/pasta/4f9ebd4aef15d9978cec51848d3597d2

Key Words:

Altamaha River, carbon cycling, carbon dioxide, carbon fluxes, climate change, fall, fluxes, freshwater, gas flux, Georgia, marshes, methane, press, pulse, recovery, respiration, respiration rates, SALTEx, spring, summer, USA, wetlands, winter

LTER Core Area:

Other Site Research

Research Themes:

Marsh Ecology

Study Period:

13-Mar-2018 to 14-Mar-2019

Study Sites:

SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA

» Download Geographic Coverage: Google Earth

Downloads:

Data Table: MSH-IRMA-1907_CH4 (CH4 data, 500 records)

Access: Public (released 02-Jul-2021)

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

Data Formats: Spreadsheet (CSV) [55.95kb], Text File [53.54kb], MATLAB (GCE Toolbox) [39.96kb], MATLAB (Variables) [40.65kb], Text Report [73.72kb]

Column List:(display)

Column	Name	Units	Type	Description
1	Treatment	none	string	Treatment group sample was taken from
2	Replicate	none	integer	Plot replicate number sample was taken from
3	Sampling_date	MM/DD/YYYY	string	Date sample was collected in the field
4	Date_run	MM/DD/YYYY	string	Date the sample was analyzed for methane
5	Sample_volume	mL	floating-point	Volume of sample collected from the field
6	Vial_size	mL	floating-point	Size of the vial the field sample was injected to
7	Volume_injected	mL	floating-point	Volume of sample injected into the gas chromatograph to be analyzed
8	CH4_area	uV*Min	floating-point	Peak area detected on the gas chromatogram for methane
9	CH4_concentration	ppm	floating-point	Sample methane concentration
10	Field_temperature	Kelvin	floating-point	Temperature of the gas chamber while collecting field samples
11	Lab_temperature	Kelvin	floating-point	Temperature of the laboratory while analyzing the samples
12	Time	hh:mm:ss	string	Time of sample collection
13	Minutes	minutes	floating-point	Minutes elapsed since start of sampling
14	Chamber_height	meters	floating-point	Height of gas chamber
15	Chamber_width	meters	floating-point	Width of gas chamber
16	Chamber_length	meters	floating-point	Length of gas chamber
17	mg_CH4_per_m3	mg/m3	floating-point	Conversion from ppm to mg of methane per m3
18	mg_CH4_per_m2	mg/m2	floating-point	Conversion to mg of methane on a per area basis
19	mg_C_per_m2	mg/m2	floating-point	Converson to mg of carbon on a per area basis
20	Site	none	string	GCE field site name

Data Table: MSH-IRMA-1907_CO2 (CO2 data, 4048 records)

Access: Public (released 02-Jul-2021)

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

Data Formats: Spreadsheet (CSV) [341.15kb], Text File [316.36kb], MATLAB (GCE Toolbox) [103.45kb], MATLAB (Variables) [103.61kb], Text Report [353.28kb]

Column List:(display)

Column	Name	Units	Type	Description
1	Treatment	none	string	Treatment group sample was taken from
2	Replicate	none	integer	Plot replicate number sample was taken from
3	Date	MM/DD/YYYY	string	Date of field sampling
4	Time	hh:mm:ss	string	Time of day the sample was measured and recorded on the instrument (ET)
5	CO2	ppm	floating-point	CO2 concentration in the gas chamber headspace measured by the field instrument every 30 seconds
6	CO2_Flag	none	string	Flag for invalid data
7	PAR	umol/m2/s	integer	Photosyntheically active radiation measurement during sampling measured by the field instrument
8	Light_Phase	%	integer	How much light was allowed to pass through the gas chamber; Note that shade cloths were not used in March 2018
9	Chamber_temperature	Kelvin	floating-point	Air temperature inside the gas chamber during sampling; temperature was manually recorded every 2 minutes, which is why it''s not continuous data like the rest; June 2018 only had a few temperature recordings for some plots
10	Minutes	minutes	floating-point	Minutes elapsed since start of sampling; note that it starts over at 0 when each shade cloth is put on and when the chamber is made fully dark with black bags
11	Chamber_height	meters	floating-point	Height of the gas chamber
12	Chamber_width	meters	floating-point	Width of the gas chamber
13	Chamber_length	meters	floating-point	Length of the gas chamber
14	mgC_per_m2	mg/m2	floating-point	Conversion to mg C on a per meter square basis
15	mgC_per_m2_Flag	none	string	Flag for invalid data
16	Site	none	string	GCE field site name

Statistics:

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Citation:

Craft, Christopher B. 2019. Methane and carbon dioxide flux in a tidal freshwater marsh recovering from three years of experimental seawater additions and following the Hurricane Irma storm surge. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/4f9ebd4aef15d9978cec51848d3597d2

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