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@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix gcis: <http://data.globalchange.gov/gcis.owl#> .
@prefix cito: <http://purl.org/spar/cito/> .
@prefix biro: <http://purl.org/spar/biro/> .

<https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/observations-of-atmospheric-carbon-dioxide-and-methane/finding/key-message-8-1>
   dcterms:identifier "key-message-8-1";
   gcis:findingNumber "8.1"^^xsd:string;
   gcis:findingStatement "Global concentrations of carbon dioxide (CO<sub>2</sub>) and methane (CH<sub>4</sub>) have increased almost linearly since the <em>First State of the Carbon Cycle Report</em> (CCSP 2007; see Figure 8.1). Over the period 2004 to 2013, global growth rates estimated from the National Oceanic and Atmospheric Administration’s (NOAA) marine boundary layer network average 2.0 ± 0.1 parts per million (ppm) per year for CO<sub>2</sub> and 3.8 ± 0.5 parts per billion (ppb) per year for CH<sub>4</sub>. Global mean CO<sub>2</sub> abundance as of 2013 was 395 ppm (compared to preindustrial levels of about 280 ppm), and CH<sub>4</sub> stands at more than 1,810 ppb (compared to preindustrial levels of about 720 ppb) (<em>very high confidence</em>)."^^xsd:string;
   gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/observations-of-atmospheric-carbon-dioxide-and-methane>;
   gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report>;

## Properties of the finding:
   
   gcis:descriptionOfEvidenceBase "The averages were calculated from the regularly updated marine boundary layer sites of NOAA’s Global Greenhouse Gas Reference Network. These averages are not associated with any recent literature. The methodology used to construct the global “surfaces” from which the global averages are computed is described in Masarie and Tans (1995). The uncertainties originate primarily from the incomplete sampling of the marine boundary layer by the NOAA network and the uncertainty associated with smoothing the raw data prior to creating the global surface. Measurement uncertainty of CO<sub>2</sub> and CH<sub>4</sub> is a minor component. Uncertainty calculations are described in detail at: www.esrl.noaa.gov/gmd/ccgg/mbl/mbl.html. While the atmospheric CO<sub>2</sub> growth rate is relatively stable, there is strong decadal and interannual variability of CH<sub>4</sub> emissions, making computation of an average inherently sensitive to the choice of time period. For instance, the CH<sub>4</sub> growth rate averaged over 1997 to 2006 was 2.8 ppb per year, whereas over 2007 to 2015, it was instead 7.0 ppb per year."^^xsd:string;
   
   gcis:assessmentOfConfidenceBasedOnEvidence "NOAA data are the gold standard for determining global growth rates and abundances because of extensive global coverage and high internal network compatibility, including high measurement precision. The trends and growth rates also agree well with estimates from other laboratories."^^xsd:string;
   
   gcis:newInformationAndRemainingUncertainties "NOAA data are the gold standard for determining global growth rates and abundances because of extensive global coverage and high internal network compatibility, including high measurement precision. The trends and growth rates also agree well with estimates from other laboratories."^^xsd:string;

   a gcis:Finding .

## This finding cites the following entities:



<https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/observations-of-atmospheric-carbon-dioxide-and-methane/finding/key-message-8-1>
   prov:wasDerivedFrom <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/preface/figure/figurep-4>.