Investigators:

David R. Munro
Cooperative Institute for Research in Environmental Sciences
University of Colorado at Boulder
NOAA Earth System Research Laboratory
325 Broadway
R/GMD1
Boulder, CO 80305
(303) 497-5765
david.munro@colorado.edu

Colm Sweeney (PI)
NOAA Earth System Research Laboratory
325 Broadway
R/GMD1
Boulder, CO 80305
(303) 497-4771
Colm.Sweeney@noaa.gov

Tim Newberger
Cooperative Institute for Research in Environmental Sciences
University of Colorado at Boulder
NOAA Earth System Research Laboratory
325 Broadway
R/GMD1
Boulder, CO 80305

Funding Info: NOAA
Initial Submission Date: 20190329
Westernmost Longitude: -72.54
Easternmost Longitude: 107.70
Northernmost Latitude: 25.05
Southernmost Latitude: -35.30

Start Date: 20180309 
End Date: 20180714 

Ports of Call: Fort Lauderdale, FL, USA 
             Durban, South Africa 
             Port Victoria, Seychelles 
             Goa, India  
             Darwin, Australia  
Vessel Name: NOAAS Ronald H. Brown 
Variable Name: xCO2_bin_QC
Units: UMOL/MOL
Description: 30 second binned atmospheric data, intervals of atmospheric stack gas removed using the standard deviation of the binned data 
Uncertainty: approximately 0.2 ppm based on analysis of air standard

Ancillary Variable Name: xCO2_MBL
Units: UMOL/MOL
Description: Interpolated value of the zonally averaged MBL reference product (Dlugokencky et al. 2017) based on GPS latitude and time

Location and Height: Bow mast, approximately ten meters above sea level

Measurement Method: Cavity Ring-Down Spectroscopy (CRDS)

Manufacturer: Picarro

Model: G2301

Instrumental setup description: The Picarro Cavity Ring Down Spectrometer (Crosson 2008) is a commercially-available instrument (Picarro, Santa Clara, CA, USA) measuring atmospheric concentrations of CO2, CH4, and H2O (model G2301m). Sample air was dried with Nafion tubing prior to analysis.

Data Frequency: CO2 measurements approximately every 1.5 seconds

Manufacturer of Calibration Gas: NOAA ESRL 
Std ID: EM57074 
xCO2: 405.28 ppm 
xCH4: 1894.99 ppb 
xCO: 149.02 ppb 

Frequency of Standard: every 8 hours

References:

Dlugokencky, EJ, et al. (2017). NOAA Greenhouse Gas Reference from Atmospheric Carbon Dioxide Dry Air Mole Fractions from the NOAA ESRL Carbon Cycle Cooperative Global Air Sampling Network.

Rella, CW, et al. (2013), High accuracy measurements of dry mole fractions of carbon dioxide and methane in humid air, Atmos. Meas. Tech.6:837-860, doi:10.5194amt-6-837-2013.

Crosson, ER (2008), A cavity ring-down analyser for measuring atmospheric levels of methane, carbon dioxide, and water vapour, Appl. Phys. B:92, 403–408, doi:10.1007s00340-008-3135-y.