Dataset: Moorings - Temp Sal O2 pH

Name: Temperature, salinity, dissolved O2, and pH from SeapHOx_Kelp_A, SeapHOx_Kelp_B, SeapHOx_Kelp_C, and SeapHOx_Kelp_D kelp moorings in the La Jolla Kelp Forest, San Diego CA, from 2010-2011 (SeapHOx project)
Published: 2013-10-10
Keywords: oceans

Cite This Dataset

Spatial Extent: N:32.85192 E:-117.28423 S:32.80807 W:-117.30521

Project:

Macrophyte-induced variability in coastal ocean pH and consequences for invertebrate larvae (SeapHOx)

Program:

Ocean Carbon and Biogeochemistry (OCB)

Principal Investigator:

Lisa A. Levin (University of California-San Diego, UCSD-SIO)

Co-Principal Investigator:

Todd R. Martz (University of California-San Diego, UCSD-SIO)

Contact:

Christina Frieder (University of California-San Diego, UCSD-SIO)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

10 October 2013

Version Date:

2013-10-10

Validated:

Yes

Current State:

Final no updates expected

Temperature, salinity, dissolved O2, and pH from SeapHOx_Kelp_A, SeapHOx_Kelp_B, SeapHOx_Kelp_C, and SeapHOx_Kelp_D kelp moorings in the La Jolla Kelp Forest, San Diego CA, from 2010-2011 (SeapHOx project)

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Description

These data are from SeapHOx deployments from in and around the La Jolla Kelp Forest and include pH, dissolved oxygen, temperature, and salinity. The data were collected using two "SeapHOx" instrument packages. The SeapHOx consists of a Honeywell Durafet III pH sensor (Martz et al. 2010), an Aanderaa 3835 oxygen optode, and an SBE-37 MicroCAT CTD. The sensors were attached to a mooring line at a given water depth below the surface (e.g. 7 m). There are four moorings utilized in this study and there is one data file which accompanies each mooring.

Related publication: Frieder, C. A., Nam, S. H., Martz, T. R., and Levin, L. A.: High temporal and spatial variability of dissolved oxygen and pH in a nearshore California kelp forest, Biogeosciences., 9, 4099-4132, doi:10.5194/bgd-9-4099-2012, 2012.
Abstract Page
Manuscript

Methods & Sampling

To calibrate the pH sensors, discrete water samples were taken during each SeapHOx deployment for the determination of total alkalinity (TA) and total dissolved inorganic carbon (DIC). The calibration samples were collected via SCUBA next to the sensor with a 5L niskin bottle. The collected seawater was transferred to a 500 ml clean borosilicate glass bottle with a ground glass neck and stopper. The samples were poisoned with a saturated mercuric chloride solution. TA measurements were determined using an open-cell, potentiometric titration (Dickson et al. 2007). DIC measurements were determined by acid extraction and coulometric detection of CO2 (Dickson et al. 2007). pH was calculated from TA and DIC using the Matlab version of CO2SYS (van Heuven et al. 2011) as recommended by Dickson et al. 2007. The calculated pH at in situ temperature from the calibration sample was used to determine the electrode-specific calibration coefficients. The calibration sample produced a pH accuracy of 0.01 units for each SeapHOx instrument. The oxygen sensors were factory calibrated by Aanderaa and before each deployment a two-point (0% and 100% saturation) offset was applied as recommended in the manual.

References:

Martz, T. R., Connery, J. G., and Johnson, K. S.: Testing the Honeywell Durafet® for seawater pH applications, Limnol. Oceanogr. Methods, 8, 172-184, 2010.

Dickson, A. G., Sabine, C. L., and Christian, J. R.: Guide to Best Practices for Ocean CO2 5 Measurements, Vol. 3, 374 PICES Spec. Publ., Sidney, British Columbia, 2007.

van Heuven et al. 2011. Matlab version of CO2SYS.

Data Processing Description

Extreme salinity outliers (= 3 SD) were removed and salinity data was smoothed with a 1-hr moving average. Oxygen was logged with factory settings. This assumes a salinity of 0 and pressure of 0. Salinity corrections (from CTD data) and pressure corrections (water depth) were applied to the oxygen data as suggested by the manufacturer’s manual. pH was calculated at in situ temperature (temperature data from CTD) using calibration coefficients as described above.

BCO-DMO Processing Notes
Generated from original files "SeapOHx_Mooring [A-D].txt" contributed by Christina Frieder

BCO-DMO Edits
- Time column spilt into Date and Time and reformatted as YYYYMMDD and HHMM
- Temp, Sal, O2 and pH data values reported to appropriate decimal places
- "NaN" values converted to "nd" (no data)
- Parameter names modified to conform to BCO-DMO convention

Data Files

File
MOORING_DATA.csv (Comma Separated Values (.csv), 6.91 MB) MD5:105d7464cbc86f32a3e5bb6ff72075cf Primary data file for dataset ID 3638

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0927445

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
SeapHOx_Kelp_A	SeapHOx_Mooring_M1	2010-07-29	SeapHOx Kelp Mooring	Lisa A. Levin (Chief Scientist) Christina Frieder (Co-Principal Investigator) Todd R. Martz (Co-Principal Investigator)	data info
SeapHOx_Kelp_B	SeapHOx_Mooring_M2	2010-07-10	SeapHOx Kelp Mooring	Lisa A. Levin (Chief Scientist) Christina Frieder (Co-Principal Investigator) Todd R. Martz (Co-Principal Investigator)	data info
SeapHOx_Kelp_C	SeapHOx_Mooring_M3	2011-09-16	SeapHOx Kelp Mooring	Lisa A. Levin (Chief Scientist) Christina Frieder (Co-Principal Investigator) Todd R. Martz (Co-Principal Investigator)	data info
SeapHOx_Kelp_D	SeapHOx_Mooring_M4	2011-04-18	SeapHOx Kelp Mooring	Lisa A. Levin (Chief Scientist) Christina Frieder (Co-Principal Investigator) Todd R. Martz (Co-Principal Investigator)	data info

Instruments

Aanderaa Oxygen Optodes

Supplied Name: Aanderaa 3835 Oxygen Optode

Supplied Description:

The SeapHOx consists of a Honeywell Durafet III pH sensor (Martz et al. 2010), an Aanderaa 3835 oxygen optode, and an SBE-37 MicroCAT CTD. The sensors were attached to a mooring line at a given water depth below the surface (e.g. 7 m).

Instrument Type

Generic Name: Aanderaa Oxygen Optodes

Acronym: AOO

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/351/

Generic Description:

Aanderaa Oxygen Optodes are instrument for monitoring oxygen in the environment. For instrument information see the Aanderaa Oxygen Optodes Product Brochure.

CTD Sea-Bird MicroCAT 37

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird MicroCAT 37

Acronym: CTD MicroCAT 37

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The Sea-Bird MicroCAT CTD unit is a high-accuracy conductivity and temperature recorder based on the Sea-Bird SBE 37 MicroCAT series of products. It can be configured with optional pressure sensor, internal batteries, memory, built-in Inductive Modem, integral Pump, and/or SBE-43 Integrated Dissolved Oxygen sensor. Constructed of titanium and other non-corroding materials for long life with minimal maintenance, the MicroCAT is designed for long duration on moorings.

In a typical mooring, a modem module housed in the buoy communicates with underwater instruments and is interfaced to a computer or data logger via serial port. The computer or data logger is programmed to poll each instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The MicroCAT saves data in memory for upload after recovery, providing a data backup if real-time telemetry is interrupted.

pH Sensor

Supplied Name: Honeywell Durafet III pH sensor

Supplied Description:

Honeywell Durafet III pH sensor

Instrument Type

Generic Name: pH Sensor

Generic Description:

An instrument that measures the hydrogen ion activity in solutions.

The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Mooring_Id	Mooring Id	text	mooring
Longitude	Mooring Longitude Position (West is negative)	decimal degrees	lon
Latitude	Mooring Latitude Position (South is negative)	decimal degrees	lat
Start_Date	Start Date of Data Collection	YYYYMMDD	start_date
End_Date	End Date of Data Collection	YYYYMMDD	end_date
Site_Description	Site description of mooring	text	site_descrip
Water_Depth	Depth of water.	meters	depth_w
Sensor_ID	There are two sensors - SP001 and SP002	text	Sensor_Id
Deployment_No	The deployment number of the respective sensor	text	deployno
Date	Date (UTC)	YYYYMMDD	date
Time	Time (UTC)	HHMM	time
Temperature	Temperature from SBE-37 MicroCAT	degrees Celsius	temp
Salinity	Salinity from SBE-37 MicroCAT	PSU	sal
Oxygen	Oxygen	micro mole/kg	O2
pH	pH (total hydrogen scale)	dimensionless	pH

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Database

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Dataset: Moorings - Temp Sal O2 pH