Dataset: Groves Creek: temperature, salinity, dissolved oxygen (YSI 600 OMS sonde)

Name: YSI sonde data: temperature, salinity, and dissolved oxygen 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 - 2015-03-10

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:

Current State:

Preliminary and in progress

YSI sonde data: temperature, salinity, and dissolved oxygen from Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2015

Abstract:

This dataset includes temperature, depth, and salinity data from a YSI 600 OMS sonde deployed in Groves Creek salt marsh, Skidaway Island Georgia, USA, from July 2013 to March 2015.

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Methods & Sampling

YSI sampling:
YSI 600 OMS sondes were used to obtain time series data for dissolved oxygen (DO) at stations S2 and S8. At S8, the sondes were mounted on the same bottom frames as the CTDs. At S2, the YSIs (and the fDOM and CHL fluorometers and the S::CAN absorbance spectrometer) were mounted on a rack in the open “moon pool” of a floating dock moored in the outside bend of the channel at Groves Creek. The open center space of the dock was ~ 1x2m, and the instruments were mounted 1 m below the surface (~80 cm below the underside of the dock). The YSIs were battery powered and sampled at 15-minute intervals. Battery power and fouling limited deployments to 2 weeks in the warm months and up to 4 weeks in the winter. Individual YSI sonde deployments at S2 and S8 overlapped by ~24-48 hours. YSIs were also subject to periodic batch intercalibration trials.

Data Processing Description

YSI data processing:
YSI temperatures closely tracked the CTDs. See the intercalibration trials for possible adjustments. The temperature data have not been processed. Salinity readings for individual sondes were quite variable relative to the CTDs. See the intercalibration data files. However, their near-surface deployment location made them less susceptible to severe fouling This the “shape” of the YSI salinity output is likely to be a more reliable representative of field conditions than the MCs, although the absolute value of the salinity for any given deployment is suspect. These two salinity data sets have not yet been reconciled to generate a representative salinity time series for either S2 or S8.

In contrast, the DO data are superb. DO concentrations obtained from the YSIs differed by on the order of 0.05 mg l-1 for successive deployments and for simultaneous intercalibration deployments. As a result, we were able to generate a single DO time series for S2 and S8 by simply averaging the differences between overlaps of successive deployments following application of a Matlab “lowess” local regression smoothing procedure. These data have also been linearly interpolated onto a 10 minute interval time axis to facilitate intercomparison to other data sets. However, the YSI-generated estimates of DO %saturation must be interpreted cautiously because the salinity output of each sonde cannot be assumed to be accurate. Uncertainties in the %saturation estimates due to errant salinities will be on the order of a few %.

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
- reduced decimal places of O2 to 2

Data Files

File
TS_O2.csv (Comma Separated Values (.csv), 8.31 MB) MD5:513ffd5eb57ec6019ca51794b97a5bf0 Primary data file for dataset ID 682912

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

YSI Sonde 6-Series

Supplied Name: YSI 600 OMS sondes

Supplied Description:

Instrument Type

Generic Name: YSI Sonde 6-Series

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0737/

Generic Description:

YSI 6-Series water quality sondes and sensors are instruments for environmental monitoring and long-term deployments. YSI datasondes accept multiple water quality sensors (i.e., they are multiparameter sondes). Sondes can measure temperature, conductivity, dissolved oxygen, depth, turbidity, and other water quality parameters. The 6-Series includes several models. More from YSI.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon
temp	temperature	degrees Celsius	temp
O2	dissolved oxygen concentration	milligrams/liter (mg/l)	O2
salinity	salinity	PSU	sal
deployment	deployment number	unitless	deployno
date	UTC date formatted as yyyy-mm-dd	unitless	date
time	UTC time; formatted as hh:mm	unitless	time
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
datenum_matlab	MATLAB formatted datenum	unitless	date
record	record number	unitless	no_bcodmo_term
station	station identifier	unitless	sta

Status message

Database

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Dataset: Groves Creek: temperature, salinity, dissolved oxygen (YSI 600 OMS sonde)