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GCE-LTER Data Set Summary
Accession:
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MSH-IRMA-1907
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Research Theme:
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Marsh Ecology (Research Study)
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Contributor:
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Christopher B. Craft
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Title:
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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
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Abstract:
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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.
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DOI:
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(not assigned)
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Key Words:
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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
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LTER Core Area:
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Other Site Research
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Research Themes:
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Marsh Ecology |
Study Period:
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13-Mar-2018 to 14-Mar-2019
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Study Sites:
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SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA
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Downloads:
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Data Table: MSH-IRMA-1907_CH4 (CH4 data, 500 records)
Access: GCE Members only (public release on 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: GCE Members only (public release on 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 |
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Citation:
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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://gce-lter.marsci.uga.edu/data/MSH-IRMA-1907
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