Dataset: Groves Creek: fluorescence and turbidity

Name: Chlorophyll fluorescence and turbidity backscatter data from Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2015
Published: 2017-02-21
Keywords: oceans

Cite This Dataset

Spatial Extent: N:31.97 E:-81.02 S:31.97 W:-81.02

Temporal Extent: 2013-07-26 - 2015-03-11

Project:

Tempo and mode of salt marsh exchange (GrovesCreek)

Principal Investigator:

William Savidge (Skidaway Institute of Oceanography, SkIO)

Co-Principal Investigator:

Jay Brandes (Skidaway Institute of Oceanography, SkIO)

Catherine Edwards (Skidaway Institute of Oceanography, SkIO)

Aron Stubbins (Skidaway Institute of Oceanography, SkIO)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2017-02-21

Restricted:

Validated:

Yes

Current State:

Final no updates expected

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

Abstract:

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.

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Methods & Sampling

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.

Data 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 (Supplemental Files). No other processing has yet been done with the turbidity data. The instrument response was regularly saturated under the turbid conditions found in Groves Creek. Chlorophyll data have been processed analogously to the fDOM data . 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. The data provided here are for the factory calibrations. Third-part users can use the data found in the manufacturer calibration sheet to make an empirical correction, while cautioning that most of the water samples were collected for analysis of chlorophyll at high tide. The contributions of turbidity and CDOM interference with the raw sonde signals have been examined. No significant contribution by either variable were revealed using multiple linear regression.

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'

Data Files

File
fluor.csv (Comma Separated Values (.csv), 10.47 MB) MD5:49b9a16b07510b4b6aaefa5c994cbbe4 Primary data file for dataset ID 682753

Supplemental Files

File
Field chlorophyll data (CSV) filename: CHL_cal_data.csv (Comma Separated Values (.csv), 16.78 KB) MD5:fa669e26bab8c498f6909975a1ea5b42 Field data that support the empirical sonde calibrations. Included in this file are the factory calibration values for each sonde deployed across the channel.
Field chlorophyll data (XLSX) filename: CHL_cal_data.xlsx (Microsoft Excel, 48.27 KB) MD5:a563a086af2f03655739b636466e3160 Field data that support the empirical sonde calibrations. Included in this file are the factory calibration values for each sonde deployed across the channel.
Groves Creek station filename: S2_S8_stations.csv (Comma Separated Values (.csv), 843 bytes) MD5:a73d14f479effe359fdadd0115456ae1 Locations and deployment dates for stations S2 and S8
Sonde factory calibration data (CSV) filename: sonde factory cals.csv (Comma Separated Values (.csv), 1.41 KB) MD5:9be3173f0b25cc5939504ad15a4dc940 Chlorophyll concentration (ug chl l-1) units using the manufacturer calibration sheets that were provided with the instruments.
Sonde factory calibration data (XLSX) filename: sonde_factory_cals.xlsx (Octet Stream, 15.66 KB) MD5:68156b2b50d7ad05c164c3c74e6ad5fa Chlorophyll concentration (ug chl l-1) units using the manufacturer calibration sheets that were provided with the instruments.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1234704

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
Groves_Creek_2013-2015		2013-07-26	Groves Creek - SkIO		data info

Instruments

Fluorometer

Supplied Name: Wetlabs FLNTUSB shuttered fluorometers

Supplied Description:

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic 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.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
chl_a	concentration of chlorophyll a	micrograms/liter (ug/l)	chl_a
date	UTC date formatted as yyyy-mm-dd	unitless	date
datenum_matlab	MATLAB formatted datenum	unitless	date
deployment	deployment number	unitless	deployno
sonde_id	sonde instrument identifier	unitless	instrument
ISO_DateTime_UTC	Date/Time (UTC) ISO formatted based on ISO 8601:2004(E) with format YYYY-mm-ddTHH:MM:SS[.xx]Z	unitless	ISO_DateTime_UTC
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon
NTU_ref	monitor of internal battery output (refer to the appropriate Wetlabs manuals for a full description)	unitless (volts/volts)	no_bcodmo_term
NTU_counts	digitized voltages of turbidity counts relative to a full scale instrument response of 4000 counts (itself representative of some maximum voltage)	unitless (volts/volts)	no_bcodmo_term
thermistor	voltage output from a temperature sensor: not used in this study	volts	no_bcodmo_term
chl_ref	monitor of internal battery output (refer to the appropriate Wetlabs manuals for a full description.)	unitless (volts/volts)	no_bcodmo_term
chl_counts	digitized voltages of chlorophyll counts relative to a full scale instrument response of 4000 counts (itself representative of some maximum voltage)	unitless (volts/volts)	no_bcodmo_term
station	station identifier	unitless	sta
time	UTC time; formatted as hh:mm	unitless	time
turbidity	turbidity	Nephelometric Turbidity Units (NTU)	turbidity

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Dataset: Groves Creek: fluorescence and turbidity