NOAA Atmospheric Carbon Dioxide Mole Fractions from American Samoa Observatory
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abstract: This data set contains continuous measurements of atmospheric carbon dioxide mole fractions from the NOAA/ESRL observatory at American Samoa. Data are expressed in hourly, daily and monthly averages in units of micromole/mole for the time period of 1976-2013. Data are archived at the NOAA National Climatic Data Center (NCDC), but are produced and available from NOAA Earth System Research Laboratory (ESRL).
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statement: CO2 mixing ratios reported in these files were measured by a nondispersive infrared absorption technique. Descriptions of the sampling, measurement, and calibration procedures are given in Waterman et al, 1989, and Zhao and Tans, 2006.
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description: Quasi-continuous CO2 dry air mole fractions from 1980 to 2006 have all been recalculated to bring them into the WMO X2007 Mole Fraction Scale (X07). The data since 2007 were already on the X07 scale. WMO X2007 is based on repeated manometric measurements of the NOAA primary standards (Zhao and Tans, 2006) and comparison of those results to similar measurements made over a period of more than 10 years at Scripps Institution of Oceanography. The difference between the X07 and the previous scales propagated by SIO and NOAA (X83, X87, etc.) is ~0.2 ppm (X07-previous) in the 1980s, decreasing to ~0.1 ppm in the late 1990s, and to 0.0 ppm by 2006. The recalculation of individual measurements was accomplished by first determining the X07 values for the reference gases used to measure the air samples and then using those values with the raw data (NDIR voltages) to recompute mole fractions for each sample.
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organisationName: DOC/NOAA/ESRL/GMD > Global Monitoring Division, Earth System Research Laboratory, NOAA, U.S. Department of Commerce
role: (CI_RoleCode) author
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: (missing)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: http://www.esrl.noaa.gov/gmd/ccl/co2report.html
applicationProfile: Web Browser
name: The WMO Mole Fraction Scales for CO2 and other greenhouse gases, and uncertainty of the atmospheric measurements
description: Carbon Dioxide (CO2) WMO Scale
function: (CI_OnLineFunctionCode) information
role: (missing)
description: See Algorithm Citation
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) repository
levelDescription: (MD_ScopeDescription)
other: NOAA National Centers for Environmental Information
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
dateTime:
DateTime: 2015-04-22T00:00:00
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Bulk metadata change applied on 2023-06-23. See version control repository history for metadata change details.
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Hartmann Braun Uras 2T #29
type: Carbon Dioxide Nondispersive Infrared Analyzer
description: Used from December 19, 1975 to February 3, 1978
mountedOn: #SMO_Platform
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Hartmann Braun Uras 2T #16
type: Carbon Dioxide Nondispersive Infrared Analyzer
description: Used from February 3, 1978 to April 19, 1998
mountedOn: #SMO_Platform
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Siemens Ultramat 5
type: Carbon Dioxide Nondispersive Infrared Analyzer
description: Used from July 19, 1998 to June 18, 2004
mountedOn: #SMO_Platform
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Licor 7000 #IRG4-0385
type: Carbon Dioxide Nondispersive Infrared Analyzer
description: Used from June 19, 2004 to present
mountedOn: #SMO_Platform
platform: (MI_Platform)
identifier: (MD_Identifier)
code: SMO
description: The American Samoa Observatory (SMO) is located in the middle of the South Pacific, about midway between Hawaii and New Zealand. It is characterized by year-round warmth and humidity, lush green mountains, and strong Samoan culture. The observatory is situated on the northeastern tip of Tutuila Island, American Samoa, at Cape Matatula.
sponsor: (CI_ResponsibleParty)
individualName: Brian Vasel
organisationName: DOC/NOAA/ESRL/GMD > Global Monitoring Division, Earth System Research Laboratory, NOAA, U.S. Department of Commerce
positionName: Chief, Observatory Operations
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: (303) 497-6655
facsimile: (303) 497-6290
address: (CI_Address)
deliveryPoint: 325 Broadway, R/GMD1
city: Boulder
administrativeArea: CO
postalCode: 80305
country: USA
electronicMailAddress: Brian.Vasel@noaa.gov
onlineResource: (CI_OnlineResource)
linkage: http://www.esrl.noaa.gov/gmd/obop/smo/
name: NOAA/ESRL/GMD American Samoa Observatory Website
description: Website with information about the American Samoa Observatory
function: (CI_OnLineFunctionCode)
hoursOfService: 7:30 - 5:00 UTC-7
role: (CI_RoleCode) pointOfContact
instrument: #Instrument1
instrument: #Instrument2
instrument: #Instrument3
instrument: #Instrument4
