Dataset: Underway pCO2 and dissolved oxygen concentrations and fluxes

Name: Underway pCO2, dissolved oxygen concentrations, and fluxes from RVIB Nathaniel B. Palmer NBP1005 in the Amundsen Sea, Southern Ocean from 2010-2011 (ASPIRE project)
Published: 2014-11-18
Keywords: oceans

Cite This Dataset

Spatial Extent: N:-73 E:-110.003 S:-74.226 W:-118.036

Project:

Amundsen Sea Polynya International Research Expedition (ASPIRE)

Principal Investigator:

Patricia L. Yager (University of Georgia, UGA)

Co-Principal Investigator:

Sharon E. Stammerjohn (University of Colorado, UCo - INSTAAR)

Contact:

Linquan Mu (University of Georgia, UGA)

Patricia L. Yager (University of Georgia, UGA)

BCO-DMO Data Manager:

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

Version:

18 November 2014

Version Date:

2014-11-18

Current State:

Preliminary and in progress

Underway pCO2, dissolved oxygen concentrations, and fluxes from RVIB Nathaniel B. Palmer NBP1005 in the Amundsen Sea, Southern Ocean from 2010-2011 (ASPIRE project)

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Description

Underway shipboard data from uncontaminated seawater flowing continuously from intake at 5 m depth. Includes pCO2, dissolved oxygen, chlorophyll fluorescence, temperature, salinity, and wind speed data from the USAP RV Nathaniel B. Palmer during austral summer 2010-11 as it sampled the Amundsen Sea Polynya during the Amundsen Sea Polynya International Research Expedition.

Methods & Sampling

See: Spatial variability of surface pCO2 and air-sea CO2 flux in the Amundsen Sea Polynya, Antarctica

Data Processing Description

Initial pCO₂ data was processed at Lamont Doherty Earth Observatory and quality controlled according to Sutherland et al. (2011). We merged this data with the ship’s underway data stream and the underway oxygen optode data (see manuscript), and then removed observations during heavy sea ice conditions. Please see the attached manuscript for all equations and assumptions used in the calculations.

See: Spatial variability of surface pCO2 and air-sea CO2 flux in the Amundsen Sea Polynya, Antarctica

BCO-DMO Processing Notes
- Generated from MGDS:jgofs files dowloaded from MGDS data for NBP1005
- Awk routine generated to reformat original files into BCO-DMO servable file format
- Awk routine: "MGDS_Underway_jgofs_2_BCO-DMO.awk"
- Parameter names generated from: JGOFSDataFormat.pdf
- Parameter names edited to conform to BCO-DMO naming convention found at Choosing Parameter Name
- Date reformatted from DD-MM-YY to YYYYMMDD
- Time reformatted from HH:MM:SS to HHMMSS
- Records with Lat/Lon values of "NAN" deleted
- Tab separated data converted to comma separated data

Data Files

File
Underway_Mu_etal.csv (Comma Separated Values (.csv), 1.01 MB) MD5:15347f6d5bcd85c07eb689f64e9e2288 Primary data file for dataset ID 540038

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Antarctic Sciences	ANT-0839069
NSF Antarctic Sciences	ANT-0838975

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
NBP1005	ASPIRE OSO 2010-11	2010-11-26	RVIB Nathaniel B. Palmer	Patricia L. Yager (Chief Scientist)	data info

Instruments

Global Positioning System Receiver

Supplied Name: GPS

Supplied Description:

This data set was acquired with a ship-based Navigation system

Instrument Type

Generic Name: Global Positioning System Receiver

Acronym: GPS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/POS03/

Generic Description:

The Global Positioning System (GPS) is a U.S. space-based radionavigation system that provides reliable positioning, navigation, and timing services to civilian users on a continuous worldwide basis. The U.S. Air Force develops, maintains, and operates the space and control segments of the NAVSTAR GPS transmitter system. Ships use a variety of receivers (e.g. Trimble and Ashtech) to interpret the GPS signal and determine accurate latitude and longitude.

Shipboard Surface Mapping System

Supplied Name: RVIB Nathaniel B. Palmer Underway Sampling Systems

Supplied Description:

RVIB Nathaniel B. Palmer Underway Sampling Systems

Instrument Type

Generic Name: Shipboard Surface Mapping System

Acronym: SMS

Generic Description:

Surface Mapping System (SMS): The SMS records navigation, meteorological and sea surface data every 10 seconds.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
k	CO2 gas transfer velocity (cm hr-1)	cm hr−1	K
Julian_day	GMT time starting from January 1 2010 (day 1). E.g. December 31 2010 – day 365 and January 1 2011 – day 366. Hours and minutes are converted to decimal fractions of a day.	day	julian_day
Latitude	Latitude (South is negative)	decimal degrees	lat
Longitude	Longitude (West is negative)	decimal degrees	lon
SST	abbreviation for Sea Surface Temperature in degrees C	deg C	SST
Temp_eq	Temperature in the underway CO2 equilibrator where pCO2 is measured. Used to correct measured value back to SST.	deg C	no_bcodmo_term
density	sea surface density (kg L-1)	kg L−1	density
P_eq	atmospheric pressure inside of CO2 analyzer (kPa)	kPa	no_bcodmo_term
Wind_cor	wind speed corrected to 10 m height	m s−1	wind_speed
Wind_avr	cruise-averaged wind speed at 10 m height	m s−1	wind_speed_c
Wind	shipboard wind speed at 25 m height	m s−1	wind_speed
Flux	air-sea CO2 flux (mmol C m-2 d-1)	mmol C m−2 d−1	no_bcodmo_term
Beta_Ko	CO2 solubility (Weiss 1974)	mol kg−1 atm−1	TCO2
SSS	abbreviation for Sea Surface Salinity (no units)	no units	sal_ss
sigma_theta	(Density – 1) x 1000 (unitless)	no units	sigma_theta
Sc	Schmidt number – a parameter related to gas transfer velocity calculation (no units) (Wanninkhof 1992)	no units	no_bcodmo_term
ln_Beta	CO2 solubility (Weiss 1974)	no units	TCO2
CO2_sat	saturation state for CO2 (%)	percentage	no_bcodmo_term
DO_sat	saturation state for DO (%)	percentage	O2sat
Chl_a	sea surface chlorophyll a fluorescence (relative units)	relative units	chl_a_fluor
pCO2_w	partial pressure of CO2 in surface seawater (uatm)	uatm	pCO2
pCO2_a	partial pressure of CO2 in atmosphere (uatm)	uatm	pCO2
Delta_pCO2	air-sea pCO2 gradient = pCO2(w) − pCO2(a) (uatm)	uatm	pCO2
DO	dissolved oxygen concentration in the surface seawater (umol L-1)	umol L−1	O2
Cstar_DO	DO solubility (concentration in equilibrium with the atmosphere)	umol L−1	no_bcodmo_term

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Dataset: Underway pCO2 and dissolved oxygen concentrations and fluxes