Dataset: MAPCO2 - SAMI-CO2
Deployment: RB-08-02

MAPCO2 SAMI-CO2 Data

Principal Investigator:

Michael DeGrandpre (University of Montana)

Contact:

Burke Hales (Oregon State University, OSU-CEOAS)

BCO-DMO Data Manager:

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

Project:

Southern Ocean Gas Exchange Experiment (SO_GasEx)

Current State:

Final no updates expected

Version:

06 Jan 2010

Deployment Synonyms:

RB0802, RHB_SO-GasEx

Version Date:

2010-01-06

Data URL:

https://www.bco-dmo.org/dataset-deployment/452990/data

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Description

SO-GasEx MAPCO2 Buoy - SAMI-CO2 data
CO2, pH, O2, and temperature data sets collected by SAMI-CO2
and SAMI-pH sensors on the MAPCO2 buoy at 6 depths.

Methods & Sampling

Dataset acquisition description

For MAPCO2 Buoy Information See: SO-GasEx cruise report, Section 5.5.1 pgs 30-33

Parameter names, definitions and units:
pCO2 - Partial pressure of CO2 in seawater, units in µatm.
O2 - Dissolved oxygen, units in µmol kg-1.

CO2 and O2 data were collected every half hour, and CO2 data were found to have good agreement with shipboard data after a 4 µatm was applied, and O2 data agreed well with discrete Winkler titrations (typically within 1 µmol kg-1). pH data was collected every hour, and interpolated to half hour intervals. The SAMI-pH sensor has an accuracy of 0.001 ± 0.0007 pH units.

The buoy was initially deployed on March 8, 2008 in a SF6/3He tracer patch, and was recovered on March 12, 2008 after it was observed to be riding too low in the water. The buoy was reconfigured, and redeployed on March 13, 2008. After the first deployment of the MapCO2 buoy the 105 m SAMI was moved up to 96 m. The ship was forced to leave the study area after the second buoy deployment due to a severe storm, and when it returned the tracer patch was dispersed. The buoy was recovered, a new tracer patch was put in place, and the buoy was deployed a third time on March 22, 2008. On March 26, 2008 the tracer patch split and the buoy, along with a small tracer patch, moved away from the main tracer patch, and was recovered on March 31, 2008.

Data Processing:
CO2 data were corrected for blank solutions, and missing data points due to the running of the blanks were replaced via linear interpolation. For quality control all data were compared to shipboard measurements when they were available (i.e. the ship was in the indicator patch).

Related files and references:
DeGrandpre, M.D., T.R. Hammar, S.P. Smith, and F.L. Sayles. 1995. In situ measurements of seawater pCO2. Limnol. Oceanogr. 40: 969-975. http://www.aadi.no/Aanderaa/Document%20Library/1/Data%20Sheets/Oxygen%20Optodes_3.pdf

Data Processing Description

Dataset Processing Description

For MAPCO2 Buoy Information See: SO-GasEx cruise report, Section 5.5.1 pgs 30-33

BCO-DMO Processing Notes
- Generated from original file CO2_O2_T_data.xls

BCO-DMO Edits
- DeploymentId added to each data record as Deployment_1, etc.
- single date/time field converted to separate fields and formatted to BCO-DMO convention
- 'NaN's and any blank fields changed to 'nd' (no data)
- data parameter names reformatted to BCO-DMO convention and depth added to each

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown SO_GasEx NASA	National Aeronautics & Space Administration
unknown SO_GasEx NOAA	National Oceanic and Atmospheric Administration
unknown SO_GasEx NSF	National Science Foundation

Instruments

Aanderaa Oxygen Optodes

Supplied Description:

Model 4175

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.

MAPCO2 Drifting Buoy

Supplied Description:

For SO-GasEx MAPCO2 Buoy Configuration See:
SO-GasEx MAPCO2 Metadata Report

Instrument Type

Generic Name: MAPCO2 Drifting Buoy

Acronym: MAPCO2

Generic Description:

The Moored Autonomous pCO2 (MAPCO2) surface drifting buoy designed by NOAA/PMEL is a low profile, high payload buoy. It was used in the SO GasEx project as a drogued drifter instrumented with a variety of autonomous instruments capable of making a coordinated set of physical, geochemical, and biological measurements at high temporal resolutions. These measurements provide a key component in the study of processes controlling air-sea CO2 exchange.

Submersible Autonomous Moored Instrument

Supplied Description:

Sampling and Analytical Methodology:

Data were collected by SAMI-CO2 sensors equipped with Aanderaa model 4175 oxygen

optodes mounted at 5, 19, 34.5, 50, 75, 105 m depth. All sensors were calibrated

in the lab prior to deployment. Blank solutions, used to detect drift in the CO2

measurements, were run every 3.5 days. The SAMI-CO2 sensor has an accuracy 1 ±1 µatm,

the optodes have an accuracy of 5% (15 µmol kg-1 at an in situ O2 concentration of

300 µmol kg-1).

CO2 and O2 data were collected every half hour, and CO2 data were found to have good

agreement with shipboard data after a 4 µatm was applied, and O2 data agreed well with

discrete Winkler titrations (typically within 1 µmol kg-1). pH data was collected

every hour, and interpolated to half hour intervals. The SAMI-pH sensor has an accuracy

of 0.001 ± 0.0007 pH units.

Instrument Type

Generic Name: Submersible Autonomous Moored Instrument

Acronym: SAMI

Generic Description:

The Submersible Autonomous Moored Instrument (SAMI) measures and logs levels of dissolved chemicals in sea and fresh water. It is a plastic cylinder about 6 inches wide and 2 feet long that is self-powered and capable of hourly measurements for up to one year. All data collected are logged to an internal memory chip to be downloaded later. SAMI sensors usually are placed a few feet underwater on permanent moorings, while others on floating drifters sample the water wherever the wind and currents carry them. The instruments have been used by researchers around the globe in a variety of studies since 1999. Dr. Mike DeGrandpre, University of Montana, developed the SAMI between 1990 and 1993 during his postdoctoral work at the Woods Hole Oceanographic Institution (Woods Hole, MA, USA). For additional information, see URL: http://www.sunburstsensors.com/ from the manufacturer, Sunburst Sensors, LLC, 1226 West Broadway, Missoula, MT 59802.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
DeploymentId	MAPCO2 Buoy Deployment Id	text	deployno
date	Date (UTC)	YYYYMMDD	date
time	Time (UTC)	HHMM	time
lon	buoy longitude position in decimal degrees (West is negative)	decimal degrees	lon
lat	buoy latitude position in decimal degrees (South is negative)	decimal degrees	lat
Temp_5m	Temperature from sensors mounted at 5meters depth	degrees celsius	temp
pCO2_5m	Partial pressure of CO2 in seawater from sensors mounted at 5meters depth	microatm	pCO2_is
O2_5m	Dissolved oxygen from sensors mounted at 5meters depth	micromol/kg	O2
Temp_34point5m	Temperature from sensors mounted at 34.5meters depth	degrees celsius	temp
pCO2_34point5m	Partial pressure of CO2 in seawater from sensors mounted at 34.5meters depth	microatm	pCO2_is
O2_34point5m	Dissolved oxygen from sensors mounted at 34.5meters depth	micromol/kg	O2
Temp_50m	Temperature from sensors mounted at 50meters depth	degrees celsius	temp
pCO2_50m	Partial pressure of CO2 in seawater from sensors mounted at 50meters depth	microatm	pCO2_is
O2_50m	Dissolved oxygen from sensors mounted at 50meters depth	micromol/kg	O2
Temp_75m	Temperature from sensors mounted at 75meters depth	degrees celsius	temp
pCO2_75m	Partial pressure of CO2 in seawater from sensors mounted at 75meters depth	microatm	pCO2_is
O2_75m	Dissolved oxygen from sensors mounted at 75meters depth	micromol/kg	O2
Temp_105m_96m	Temperature from sensors mounted at 105meters or 96meters depths	degrees celsius	temp
pCO2_105m_96m	Partial pressure of CO2 in seawater from sensors mounted at 105meters or 96meters depths	microatm	pCO2_is
O2_105m_96m	Dissolved oxygen from sensors mounted at 105meters or 96meters depths	micromol/kg	O2
Temp_1m	Temperature at 1meter depth	degrees celsius	temp
pH_1m	pH at 1meter depth	pH (sea water scale)	pH_sw

Database

Contribute Data

Dataset: MAPCO2 - SAMI-CO2
Deployment: RB-08-02

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: MAPCO2 - SAMI-CO2Deployment: RB-08-02

Dataset acquisition description

Dataset Processing Description

Dataset: MAPCO2 - SAMI-CO2
Deployment: RB-08-02