International comparison CCQM-K82: methane in air at ambient level (1800 to 2200) nmol/mol

Flores, Edgar; Viallon, Joële; Choteau, Tiphaine; Moussay, Philippe; Wielgosz, Robert; Kang, Namgoo; Kim, Byung Moon; Zalewska, Ewelina; Veen, Adriaan H van der; Konopelko, L. A.; Wu, Hai; Han, Qiao; Rhoderick, George C.; Guenther, Franklin R.; Watanabe, Takuro; Shimosaka, Takuya; Kato, Kenji; Hall, B. D.; Brewer, Paul J.

doi:10.1088/0026-1394/52/1a/08001

Cited by 18 publications

(27 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4 also shows comparisons made between the WCC and standards prepared by NMIs. The NMI standards showed an offset of about 2-3 nmol mol −1 compared to the WMO-CH 4 -X2004A calibration scale, which is in good agreement with the results of the BIPM key comparison CCQM-K82 [22].…”

Section: Quality Assurance and Quality Controlsupporting

confidence: 85%

“…CCLs are encouraged to compare the WMO-GAW scales to other independent scales whenever possible, e.g. through participation in key comparisons organised by BIPM [22,23] and other exercises as appropriate. All WMO measurements are made traceable to an appropriate scale [30,53], which leads to high internal consistency of data within and between networks.…”

Section: Quality Assurance and Quality Controlmentioning

confidence: 99%

See 1 more Smart Citation

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

et al. 2019

Self Cite

View full text Add to dashboard Cite

We present the global research landscape which aims to deliver a measurement infrastructure to underpin atmospheric observations of key greenhouse gases governing changes in the Earth's climate. These measurements present a significant challenge to the metrological community, analytical laboratories and major producers of reference materials. The review focuses on the progress made in the Gas Analysis Working Group of the Consultative Committee for Amount of Substance: Metrology in Chemistry and Biology (CCQM-GAWG) in establishing the primary realisation of the amount-of-substance fraction for carbon dioxide, methane and nitrous oxide in an air matrix. It also focuses on the importance of providing traceable measurements of isotopic composition of these components for commutability of reference materials and for isotope ratio measurements for greenhouse gas source attribution. Metrologia 56 (2019) 034006 (29pp) P J Brewer et al 2 of the World Meteorological Organization (WMO) for providing the framework for the development and implementation of integrated greenhouse gas observations, which is vital for understanding the global carbon cycle and the role greenhouse gases play in climate change. The developments in analytical techniques are also discussed which have shaped the direction of the metrology required to meet the evolving and future needs of stakeholders.

show abstract

Section: Quality Assurance and Quality Controlsupporting

confidence: 85%

Section: Quality Assurance and Quality Controlmentioning

confidence: 99%

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…The 2012 CCQM-K82 comparison for CH 4 showed excellent results among NMIs and significant reduction in uncertainty from the 2002 CCQM-P41 comparison. 45 A new comparison for atmospheric level CO 2 , CCQM-K120, is currently underway, and an ambient level N 2 O study is planned for 2019.…”

Section: ■ Discussionmentioning

confidence: 99%

NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Compounds

et al. 2018

View full text Add to dashboard Cite

There are many gas phase compounds present in the atmosphere that affect and influence the earth's climate. These compounds absorb and emit radiation, a process which is the fundamental cause of the greenhouse effect. The major greenhouse gases in the earth's atmosphere are carbon dioxide, methane, nitrous oxide, and ozone. Some halocarbons are also strong greenhouse gases and are linked to stratospheric ozone depletion. Hydrocarbons and monoterpenes are precursors and contributors to atmospheric photochemical processes, which lead to the formation of particulates and secondary photo-oxidants such as ozone, leading to photochemical smog. Reactive gases such as nitric oxide and sulfur dioxide are also compounds found in the atmosphere and generally lead to the formation of other oxides. These compounds can be oxidized in the air to acidic and corrosive gases and contribute to photochemical smog. Measurements of these compounds in the atmosphere have been ongoing for decades to track growth rates and assist in curbing emissions of these compounds into the atmosphere. To accurately establish mole fraction trends and assess the role of these gas phase compounds in atmospheric chemistry, it is essential to have good calibration standards. The National Institute of Standards and Technology has been developing standards of many of these compounds for over 40 years. This paper discusses the development of these standards.

show abstract

“…NIM participated in two inter-agency comparison experiments on calibration standards including standards traceable to the WMO scale. The results can be found in references [29,30].…”

Section: Trace Gas Analyzermentioning

confidence: 95%

Anthropogenic CH4 Emissions in the Yangtze River Delta Based on A “Top-Down” Method

et al. 2019

View full text Add to dashboard Cite

There remains significant uncertainty in the estimation of anthropogenic CH 4 emissions at local and regional scales. We used atmospheric CH 4 and CO 2 concentration data to constrain the anthropogenic CH 4 emission in the Yangtze River Delta one of the most populated and economically important regions in China. The observation of atmospheric CH 4 and CO 2 concentration was carried out from May 2012 to April 2017 at a rural site. A tracer correlation method was used to estimate the anthropogenic CH 4 emission in this region, and compared this "top-down" estimate with that obtained with the IPCC inventory method. The annual growth rates of the atmospheric CO 2 and CH 4 mole fractions are 2.5 ± 0.7 ppm year −1 and 9.5 ± 4.7 ppb year −1 , respectively, which are 9% and 53% higher than the values obtained at Waliguan (WLG) station. The average annual anthropogenic CH 4 emission is 4.37 (± 0.61) × 10 9 kg in the YRD (excluding rice cultivation). This "top-down" estimate is 20-70% greater than the estimate based on the IPCC method. We suggest that possible sources for the discrepancy include low biases in the IPCC calculation of emission from landfills, ruminants and the transport sector.Atmosphere 2019, 10, 185 2 of 21 activities and sums up the individual components to the domain of interest. One problem is that activity data, such as landfill and livestock, and emission factors cannot be accurately determined at the regional and the city scale [8][9][10]. A study in Beijing found that the uncertainty caused by landfill accounts for nearly half of the total uncertainty in the CH 4 emission estimate [11]. Accurate and timely calculations of anthropogenic CH 4 emissions at the regional scale are necessary for assessing the effectiveness of emission reduction policies.Anthropogenic greenhouse gas emissions can also be estimated from observations of the gaseous concentrations in the atmosphere ("top-down" methods). The "atmospheric method" used in this study is one of the "top-down" approaches. One reason for using the atmospheric method is that many sources of anthropogenic CH 4 cannot be quantified with traditional methods, such as the chamber method [12][13][14]. The atmospheric method requires simultaneous concentration measurements of the target gas (CH 4 ) and a tracer gas (usually CO 2 ) when there is no disturbance from sinks or other natural sources [15]. In an observational study using aircraft profile measurement over a broad region of Alaska and Canada, the concentrations of CH 4 and CO 2 increase synchronously with height, showing a strong positive correlation between the two gases [16]. A similar positive relationship also exists in the surface air in a moderately polluted urban atmosphere of Boulder, USA [16]. The explanation for the positive relationship is that the two gases share common source areas and undergo the same long-range transport [17,18]. The concentration ratio between the two gases were used to estimate the CH 4 emissions in the densely populated urban areas in Southern California, showing ...

show abstract

International comparison CCQM-K82: methane in air at ambient level (1800 to 2200) nmol/mol

Cited by 18 publications

References 2 publications

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Compounds

Anthropogenic CH4 Emissions in the Yangtze River Delta Based on A “Top-Down” Method

Contact Info

Product

Resources

About