Dataset: OA pH Temp

Name: Nearshore pH and temperature at mooring sites in McMurdo Sound, Antarctica, Overwinter 2011-2012
Published: 2019-01-28
License: https://creativecommons.org/licenses/by/4.0/
Keywords: oceans

Cite This Dataset

Spatial Extent: N:-77.63422 E:166.41467 S:-77.63422 W:166.41467

Temporal Extent: 2013-11-12 - 2014-10-23

Project:

Linking natural variability and anthropogenic changes in pH and temperature to performance in calcifying Antarctic marine invertebrates (OA pH, Temp, Calc Inverts)

Principal Investigator:

Dr Gretchen E. Hofmann (University of California-Santa Barbara, UCSB)

Contact:

Umihiko Hoshijima (University of California-Santa Barbara, UCSB)

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2019-01-28

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/753430/data

Nearshore pH and temperature at mooring sites in McMurdo Sound, Antarctica, Overwinter 2011-2012

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Description

All methods are described in Kapsenberg et al. (2015). Data were collected using an autonomous SeaFET pH sensor containing Honeywell DuraFET electrodes (Martz et al., 2010). Sensor depth was 18 m with ~27 m bottom depth. Sensors sampled on a 4-hour frequency.

Acquisition Description

Conversion from voltage to pH (on a total scale) was performed using a single discrete calibration sample collected via SCUBA using a 5 L GO-FLO sampling bottle. Sample collection was conducted within the first two weeks of sensor deployment, after sensor conditioning to seawater, in-situ. Samples were preserved with saturated mercuric chloride Standard Operating Procedure (SOP) 1 (Dickson et al., 2007) and analyzed for spectrophotometric pH (total scale, at 25 degrees Celsius) and total alkalinity following SOP 6b and 3b (Dickson et al. 2007). Sample salinity was measured using a calibrated YSI 3100 Conductivity Instrument. In-situ pH was calculated using the program CO2Calc [Version 1.0.1, 2010, U.S. Geological Survey] using SeaFET temperature recorded at the time of sample collection.

SeaFET thermistors were not individually calibrated resulting in a maximum estimated temperature offset of ~0.3 degrees Celsius.

All processing was conducted in R (v.3.5.1) using seacarb (v.3.2.8) to generate calibration coefficients for the sensor that were later applied to the datset.

Processing Description

BCO-DMO Processing Notes:

- appended lat, lon, sensor_depth, and water_depth columns to include spatial information with the data.
- removed first column as it was an index for the row number.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Antarctic Sciences	PLR-1246202

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
McMurdo_pH_Temp		2013-11-12	McMurdo Station	Dr Gretchen E. Hofmann (Principal Investigator)	data info

Instruments

SeapHOx/SeaFET

(more info)

Short Name: SeapHOx/SeaFET

Generic Description

The SeapHOx and SeaFET are autonomous sensors originally designed and developed by the Todd Martz Lab at Scripps Institution of Oceanography. The SeaFET was designed to measure pH and temperature. The SeapHOx, designed later, combined the SeaFET with additional integrated sensors for dissolved oxygen and conductivity. Refer to Martz et al. 2010 (doi:10.4319/lom.2010.8.172).

The SeapHOx package is now produced by Sea-Bird Scientific and allows for integrated data collection of pH, temperature, salinity, and oxygen. Refer to Sea-Bird for specific model information.

PI supplied instrument name: SeaFET sensors

Dataset-specific description

Instruments are SeaFET® sensors using a Honeywell DuraFET® electrode, as well as a Thermo Cl-ISE as an external reference for data quality control. (Martz et al, 2010).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
id	identifier	unitless	unknown
lat	latitude in degrees north	decimal degrees	lat
lon	longitude in degrees east	decimal degrees	lon
pH	pH	total units	pH
sensor_depth	sensor depth	meters	depth
temp	water temperature	degrees Celsius	temp
time	date and time of collection in yyyy-mm-dd HH:MM:SS format	unitless	date
water_depth	bottom depth	meters	depth_bottom

Database

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Dataset: OA pH Temp