Intercomparison of commercial analyzers for atmospheric ethane and methane observations
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Published:2023-03-17
Issue:5
Volume:16
Page:1431-1441
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Commane RóisínORCID, Hallward-Driemeier AndrewORCID, Murray Lee T.ORCID
Abstract
Abstract. Methane (CH4) is a strong greenhouse gas that has become the focus of
climate mitigation policies in recent years. Ethane/methane ratios can be
used to identify and partition the different sources of methane, especially
in areas with natural gas mixed with biogenic methane emissions, such as
cities. We assessed the precision, accuracy, and selectivity of three
commercially available laser-based analyzers that have been marketed as
measuring instantaneous dry-mole fractions of methane and ethane in ambient
air. The Aerodyne SuperDUAL instrument performed the best out of the three
instruments, but it is large and requires expertise to operate. The Aeris
Mira Ultra LDS analyzer also performed well for the price point and small
size, but it required characterization of the water vapor dependence of reported
concentrations and careful set-up for use. The Picarro G2210-i precisely
measured methane, but it did not detect the 10 ppbv (part-per-billion by
volume) increases in ambient ethane detected by the other two instruments
when sampling a plume of incompletely combusted natural gas. For long-term
tower deployments or those with large mobile laboratories, the Aerodyne
SuperDUAL provides the best precision for methane and ethane. The more
compact Aeris MIRA can, with careful use, quantify thermogenic methane
sources to sufficient precision for mobile and short-term deployments in
urban or oil and gas areas. We weighed the advantages of each instrument,
including size, power requirement, ease of use on mobile platforms, and
expertise needed to operate the instrument. We recommend the Aerodyne
SuperDUAL or the Aeris MIRA Ultra LDS depending on the situation.
Funder
National Oceanic and Atmospheric Administration New York State Energy Research and Development Authority
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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