Methane

Continuous Methane Concentration Measurements by using a customized Gas Chromotograph-FID (Agilent 6890N ).

Citation proposal
(2011) . Methane. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/6c4be9d4-8ecd-4921-9071-753bb9c5dcc6

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Alternate title

Date ( Publication ): 2011-04-05T03:00:00

Purpose

Following water vapor and carbon dioxide, methane (CH4) is the most abundant greenhouse gas in the troposphere. Concentrations of CH4 have more than doubled since pre-industrial times, with a current globally-averaged mixing ratio of 1750 ppbv.

CH4 has a 100-year global Warming Potential (GWP) of 21 and an atmospheric life time of 12 years.

Additional CH4 is actually much more effective as a greenhouse gas than additional carbon dioxide.

Methane is also the most abundant reactive trace gas in the troposphere and its reactivity is important to both tropospheric and stratospheric chemistry.

Status: On going

Point of contact

Urbino University - Dipartimento di Scienza di Base e Fondamenti - Michela Maione ( )

Piazza Rinascimento 6 Urbino PU 61029 Italy

+39 0722 303316

Maintenance and update frequency: As needed

Keywords

Methane , Greenhouse gas , Station , High Altitude , SHARE , Network , , Apennines

Keywords

GAW , Atmosphere conditions , Environmental monitoring facilities

Use limitation: No conditions apply

Access constraints: Copyright

Other constraints

Character set: UTF8

Topic category

Climatology, meteorology, atmosphere

Supplemental Information

Reference system identifier: WGS 1984

OnLine resource: Mt. Cimone website
Official website of the Mount Cimone Station - Italian Climate Observatory "Ottavio Vittori"

OnLine resource: GAW-WDCGG Website
Official website of the Global Atmosphere Watch - World data Center for GReenhouse Gases

OnLine resource: Mt. Cimone website
Official website of the methane measurements at the Mount Cimone Station - Italian Climate Observatory "Ottavio Vittori"

OnLine resource: gn:MountCimone
Show position

OnLine resource

WMO_TD_1478_GAW185

GAW Report No. 185

Guidelines for the Measurement of Methane and Nitrous Oxide and their Quality Assurance

OnLine resource: Databases CH4-Mt.Cimone Station-The World Data Centre for Greenhouse Gases (WDCGG)
Databases CH4-Mt.Cimone Station-The World Data Centre for Greenhouse Gases (WDCGG)

Hierarchy level: Series

Statement

Methane is measured by using a customized GC-FID (Agilent 6890N ). Separation is performed on a double column system (precolumn/backflush: Unibeads 1s; analytical column: Molecular SIeve 5A), isothemrically.

Reference standard are real air pumped in Luxfer Scott Marrin cylinders and calibrated at MPI-Jena against NOAA cylinders.

Calibration: every 15 minutes a sample is analyzed alternating between real air and reference standard in order to correct for short time instrumental drifts.

Molar fraction is calculated from the ratio of the peak heights.