scholarly journals Ethane measurement by Picarro CRDS G2201-i in laboratory and field conditions: potential and limitations

2020 ◽  
Author(s):  
Sara M. Defratyka ◽  
Jean-Daniel Paris ◽  
Camille Yver-Kwok ◽  
Daniel Loeb ◽  
James France ◽  
...  
Keyword(s):  
Controlled Release ◽  
Laboratory Tests ◽  
Global Scale ◽  
Compressor Station ◽  
Tracer Gas ◽  
Release Experiment ◽  
Stationary Conditions ◽  
Mobile Measurements ◽  
Mobile Condition

Abstract. Ethane can be used as a tracer gas to distinguish methane sources, both at the local and global scale. Currently, ethane can be successfully measured using flasks or dedicated in-situ analyzers. In our study, we consider the possibility of using the CRDS Picarro G2201-i instrument, dedicated to isotopic CH4 and CO2, for suitable measurements of ethane:methane ratio in mobile field, near-source conditions. Our work was divided into three steps. First, laboratory tests were run to characterize the instrument in stationary conditions. Then the instrument performance was tested in the field, as part of a controlled release experiment and finally during mobile measurements focused on gas compressor stations. The results from the field are compared with the results from other instruments, dedicated to ethane measurements. Our study clearly shows the potential of using the CRDS G2201-i instrument to determine the ethane:methane ratio in methane plumes in mobile condition with an ethane uncertainty of 50 ppb. Assuming typical ethane to methane ratio ranging between 0 and 0.1 ppb ppb−1 we conclude that the instrument can correctly estimate the “true” ethane to methane ratio within 1-sigma uncertainty in CH4 enhancements of 1 ppm or more as can be found in the vicinity of strongly emitting sites (such as natural gas compressor station).

scholarly journals Ethane measurement by Picarro CRDS G2201-i in laboratory and field conditions: potential and limitations

2021 ◽  
Vol 14 (7) ◽  
pp. 5049-5069
Author(s):  
Sara M. Defratyka ◽  
Jean-Daniel Paris ◽  
Camille Yver-Kwok ◽  
Daniel Loeb ◽  
James France ◽  
...  
Keyword(s):  
Isotopic Ratio ◽  
Global Scale ◽  
Field Conditions ◽  
Carbon Isotopic Ratio ◽  
Carbon Isotopic ◽  
Methane Source ◽  
Stationary Conditions ◽  
Mobile Measurements ◽  
Mobile Measurement

Abstract. Atmospheric ethane can be used as a tracer to distinguish methane sources, both at the local and global scale. Currently, ethane can be measured in the field using flasks or in situ analyzers. In our study, we characterized the CRDS Picarro G2201-i instrument, originally designed to measure isotopic CH4 and CO2, for measurements of ethane-to-methane ratio in mobile-measurement scenarios, near sources and under field conditions. We evaluated the limitations and potential of using the CRDS G2201-i to measure the ethane-to-methane ratio, thus extending the instrument application to simultaneously measure two methane source proxies in the field: carbon isotopic ratio and the ethane-to-methane ratio. First, laboratory tests were run to characterize the instrument in stationary conditions. Subsequently, the instrument performance was tested in field conditions as part of a controlled release experiment. Finally, the instrument was tested during mobile measurements focused on gas compressor stations. The results from the field were afterwards compared with the results obtained from instruments specifically designed for ethane measurements. Our study shows the potential of using the CRDS G2201-i instrument in a mobile configuration to determine the ethane-to-methane ratio in methane plumes under measurement conditions with an ethane uncertainty of 50 ppb. Assuming typical ethane-to-methane ratios ranging between 0 and 0.1 ppb ppb−1, we conclude that the instrument can accurately estimate the “true” ethane-to-methane ratio within 1σ uncertainty when CH4 enhancements are at least 1 ppm, as can be found in the vicinity of strongly emitting sites such as natural gas compressor stations and roadside gas pipeline leaks.

Watching the leakage: DAS seismic monitoring of the shallow CO2 controlled-release experiment at the South West Hub In-situ Laboratory

2019 ◽  
Author(s):  
Konstantin Tertyshnikov ◽  
Roman Pevzner ◽  
Barry Freifeld ◽  
Ludovic Ricard ◽  
Arsham Avijegon
Keyword(s):  
Controlled Release ◽  
Seismic Monitoring ◽  
The South ◽  
Release Experiment ◽  
South West

scholarly journals DAS seismic monitoring of the shallow CO2 controlled-release experiment at the South West Hub In-Situ Laboratory

2019 ◽  
Vol 2019 (1) ◽  
pp. 1-3
Author(s):  
K. Tertyshnikov ◽  
R. Pevzner ◽  
B. Freifeld ◽  
L. Ricard ◽  
A. Avijegon
Keyword(s):  
Controlled Release ◽  
Seismic Monitoring ◽  
The South ◽  
Release Experiment ◽  
South West

The CO2CRC Otway Shallow CO2 Controlled Release Experiment: Geological Model and CO2 Migration Simulations

2019 ◽  
Author(s):  
Andrew Feitz ◽  
Bruce Radke ◽  
Md. Shahadat Hossain ◽  
Brett Harris ◽  
Ralf Schaa ◽  
...  
Keyword(s):  
Controlled Release ◽  
Geological Model ◽  
Release Experiment

The Co2crc Otway Shallow Co2 Controlled Release Experiment: Fault Characterization and Leakage Scenarios

2021 ◽  
Author(s):  
Andrew Feitz ◽  
Bruce Radke ◽  
Kwong Soon Chan ◽  
Ludovic Ricard ◽  
Aleks Kalinowski ◽  
...  
Keyword(s):  
Controlled Release ◽  
Release Experiment ◽  
Fault Characterization

scholarly journals Two decades of in-situ temperature measurements in the upper troposphere and lowermost stratosphere from IAGOS long-term routine observation

2017 ◽  
Author(s):  
Florian Berkes ◽  
Patrick Neis ◽  
Martin G. Schultz ◽  
Ulrich Bundke ◽  
Susanne Rohs ◽  
...  
Keyword(s):  
Weather Forecast ◽  
Global Scale ◽  
Temperature Trend ◽  
Data Set ◽  
Medium Range Weather Forecast ◽  
Upper Troposphere ◽  
Temperature Trends ◽  
Geographical Regions

Abstract. Despite several studies on temperature trends in the tropopause region, a comprehensive understanding of the evolution of temperatures in this climate-sensitive region of the atmosphere remains elusive. Here we present a unique global-scale, long-term data set of high-resolution in-situ temperature data measured aboard passenger aircraft within the European Research Infrastructure IAGOS (In-service Aircraft for a Global Observing System, www.iagos.org). This data set is used to investigate temperature trends within the global upper troposphere and lowermost stratosphere (UTLS) for the period 1995 to 2012 in different geographical regions and vertical layers of the UTLS. The largest amount of observations is available over the North Atlantic. Here, a neutral temperature trend is found within the lowermost stratosphere. This contradicts the temperature trend in the European Centre for Medium Range Weather Forecast (ECMWF) ERA-Interim reanalysis, where a significant (95 % confidence) temperature increase of +0.56 K/decade is obtained. Differences between trends derived from observations and reanalysis data can be traced back to changes in the temperature bias between observation and model data over the studied period. This study demonstrates the value of the IAGOS temperature observations as anchor point for the evaluation of reanalyses and its suitability for independent trend analyses.

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