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    Chlorophyll fluorescence and turbidity backscatter data from Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2015
    
  
  
    
    

Chlorophyll fluorescence and turbidity backscatter data from Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2015

Website: https://www.bco-dmo.org/dataset/682753
Data Type: Other Field Results
Version:
Version Date: 2017-02-21

Project
» Tempo and mode of salt marsh exchange (GrovesCreek)
ContributorsAffiliationRole
Savidge, WilliamSkidaway Institute of Oceanography (SkIO)Principal Investigator
Brandes, JaySkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Edwards, CatherineSkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Stubbins, AronSkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Coverage

Spatial Extent: Lat:31.97 Lon:-81.02
Temporal Extent: 2013-07-26 - 2015-03-11

Dataset Description

Chlorophyll fluorescence and turbidity backscatter were measured at two stations in Groves Creek salt marsh, Skidaway Island Georgia, USA from July 2013 to March 2015.


Acquisition Description

Chlorophyll and turbidity sampling: Chlorophyll fluorescence and turbidity backscatter at S2 and S8 were measured with Wetlabs FLNTUSB shuttered fluorometers. The deployment scheme for the FLNTUSB units was identical to that for the YSI and FLCDs.  The YSIs, FLCD and FLNTUSB fluorometers were swapped out on the same schedules.  At S2, the fluorometers were also mounted below the “moon pool” of the floating dock and were ~ 1m from the YSIs.   At S8, they were collocated on the bottom frame with the other instruments.


Processing Description

Chlorophyll and turbidity data processing.
Raw turbidity backscatter and chlorophyll fluorescence counts have been converted to NTUs (nepthelometric turbidity unit) and chlorophyll concentration (ug chl l-1) units using the manufacturer calibration sheets that were provided with the instruments. No other processing has yet been done with the turbidity data. Chlorophyll data have been processed analogously to the CDOM data (above). While the chlorophyll data are likely to be “right” in a relative sense, the absolute value of the sonde readings underestimate in situ chlorophyll obtained from extracted samples by a factor of 2-3. Moreover, the contributions of turbidity and CDOM interference with the raw sonde signals have not been fully assessed.

BCO-DMO Processing notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- added station, lat, lon, date, time, ISO_DateTIme columns
- ISO Date format generated from date and time values
- blank values replaced with no data value 'nd'


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Parameters

ParameterDescriptionUnits
stationstation identifier unitless
latlatitude; north is positive decimal degrees
lonlongitude; east is positive decimal degrees
dateUTC date formatted as yyyy-mm-dd unitless
timeUTC time; formatted as hh:mm unitless
ISO_DateTime_UTCDate/Time (UTC) ISO formatted based on ISO 8601:2004(E) with format YYYY-mm-ddTHH:MM:SS[.xx]Z unitless
deploymentdeployment number unitless
datenum_matlabMATLAB formatted datenum unitless
chl_refchlorophyll reference... ?
chl_countschlorophyll counts... ?
NTU_refturbidity reference... ?
NTU_countsturbidity counts... ?
thermistorthermistor reading? ?
sonde_idsonde instrument identifier unitless
chl_aconcentration of chlorophyll milligrams/liter (mg/l)
turbidityturbidity Nephelometric Turbidity Units (NTU)


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Instruments

Dataset-specific Instrument Name
Wetlabs FLNTUSB shuttered fluorometers
Generic Instrument Name
Fluorometer
Generic Instrument Description
A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.


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Deployments

Groves_Creek_2013-2015

Website
Platform
Groves Creek - SkIO
Start Date
2013-07-26
End Date
2015-03-11
Description
Studies of temporal and compositional changes in exported material in a saltmarsh, both the quantity and quality of dissolved organic matter (DOM) and particulate organic matter (POM) exported from Groves Creek.


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Project Information

Tempo and mode of salt marsh exchange (GrovesCreek)


Coverage: Salt marsh east of Savannah, Georgia, USA.


Description from NSF award abstract: Salt marshes are critical mediators of the flux of material between the terrestrial and marine realms. The balance of material import, export, and transformation affects both the marsh itself and the surrounding estuary. Previous efforts to understand the role of marshes have concentrated either on examining temporal changes (often at low resolution) of bulk exports, or compositional changes in exported material with little regard for its temporal variability. Researchers working at the Skidaway Institute of Oceanography contend that both the quantity and quality of materials exchanged between marsh and estuary in tidally-dominated systems along the southeastern US coast vary significantly in response to semidiurnal, diurnal, tidal, meteorological and seasonal forcing, and that this variability must be included when considering the total contributions of marshes to carbon cycling along the land-ocean boundary. This study will utilize a three-pronged strategy to assess both the quantity and quality of dissolved organic matter (DOM) and particulate organic matter (POM) exported from Groves Creek, a well-characterized meso-tidal salt marsh in coastal Georgia. In particular, by evaluating how marsh function responds to a full spectrum of present environmental conditions, this project will provide tangible insight into how carbon cycling in these critical regions will respond to anticipated changes in those conditions. This project is related to the project "Marine priming effect - molecular mechanisms for the biomineralization of terrigenous dissolved organic matter in the ocean" found at https://www.bco-dmo.org/project/554157.


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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database.    2020-04-04  08:39:22