In line with the GAW Data Policy, users should contact the contributors of all data of interest and propose co-authorship or acknowledgement.
Organization
| NO | 23 |
|---|---|
| Acronym | Empa |
| Name | Swiss Federal Laboratories for Materials Science and Technology |
| Address 1 | Überlandstrasse 129 |
| Address 2 | 8600 Dübendorf |
| Address 3 | Switzerland |
| Country/Territory | Switzerland |
| Website | http://www.empa.ch/gaw |
Contact(s)
| Name | Martin Steinbacher |
|---|---|
| Prefix | Dr. |
| martin.steinbacher@empa.ch | |
| Organization No | 23 |
| Organization acronym | Empa |
| Organization name | Swiss Federal Laboratories for Materials Science and Technology |
| Organization country/territory | Switzerland |
| Address 1 | Ueberlandstrasse 129 |
| Address 2 | CH-8600 Duebendorf |
| Address 3 | Switzerland |
| Country/territory | Switzerland |
| Tel | +41 58 765 4048 |
| Fax | |
| Last updated date | 2024-05-28 |
| Background observation | |
| UTC+01:00 | |
| ppb | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A |
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2005-01-01 00:00:00 - 2009-12-31 23:59:59: Agilent 6890N(Gas chromatography (FID)) 2010-01-01 00:00:00 - 2011-09-15 23:59:59: Picarro G1301(CRDS) 2011-09-16 00:00:00 - 9999-12-31 23:59:59: Picarro G2401(CRDS) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: 10 (m) |
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| 5 seconds | |
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GC-FID: before December 2008: every 30min (alternating with air samples) after December 2008: every 24min (alternating with air samples) CRDS: from January 2010: Calibrations are performed every 46 hours with two calibration gases. In addition, a target gas is analyzed every 15 hours to detect potential shorter term instrument sensitivity changes. mean precision for 20 mins of working standard analysis: < 0.02% 3 December 2016: Calibration frequency was reduced to one a week but calibration sequence is run 4 times in a row to identify/eliminate effects in the pressure regulators while sample refers stagnant for several days. Two target tanks are connected to timely identify instrumental or calibration issues. The GC-FID data are not reported anymore after 2009. However, the GC-FID still ran next to the CRDS analyzer until summer 2016 and regular comparisons of the side-by-side observations are performed for quality control and a very good agreement between the two techniques for the multi-year overlap period is observed. since December 2015: reference gases are prepared and analyzed by the ICOS Central Calibration Laboratory in Jena, Germany |
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Quality assurance procedures involve time series plots, consistency checks; the expanded measurement uncertainty for the CRDS measurements (2010 - ongoing) is estimated to be: U_CH4 = 2 * ((0.31 nmol mol-1)^2 + (3.61e-4 * c)^2)^(1/2) with c = CH4 mole fraction in nmol mol-1. which is largely determined by the uncertainty in the nominal values of the reference gases. Standard deviation of repeated target tank measurements is < 0.5 ppb. |
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[Hourly] From 2014 onwards: number of detections refers to the number of available 5-second averages within the respective hour; data are discarded when less than 240 5-second averages are available for the respective hour [Daily] From 2014 onwards: number of detections refers to the number of available 1-min averages within the respective day From 2018 onwards: number of detections refers to the number of available hourly averages within the respective day [Monthly] From 2014 onwards: number of detections refers to the number of available 1-min averages within the respective month From 2018 onwards: number of detections refers to the number of available daily averages within the respective month |
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| Operational/Reporting | |
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Sampling Environment : high-alpine, measurements in pristine air, usually negligible local sources. Surfaces are mostly covered by snow or ice apart from some steep slopes of bare rock. No vegetation or soil present in the vicinity. Air intake : open-face, ambient Sampling and Analysis Frequency : GC-FID: 30min till December 2008 24min since December 2008 CRDS: data are continuously recorded in 2-sec (G1301)and 5-sec (G2401) intervals, respectively Scientific Aim : long-term trend of background mixing ratios in Europe source allocations / regional emission estimates during pollution events Description of Instruments : Samples analysed by GC-FID are dried prior to analysis by means of a Nafion dryer. Since 2010, CH4 observations are performed with a commercially available instrument (Picarro Inc. G1301) based on the Wavelength-Scanned Cavity Ringdown Spectroscopy technique coupled to a custom-built calibration/drying unit. The sample air was dried prior to analysis by means of a Nafion dryer until August 2010. Along with CH4, the instrument is also capable to measure CO2 and H2O. Thus, the CH4 data can be corrected for interferences of remaining water traces. From August 2010 on, no water vapor removal was used anymore and CH4 dry air mixing ratios are determined by application of an empirical humidity correction to the fully unaltered humid gas stream accounting for dilution and pressure broadening effects. The G1301 analyzer was replaced by a G2401 (Picarro Inc.) analyzer on 16 September 2011. From 16 September 2011 until 01 November 2017 and since 25 October 2019 the sample air is dried prior to analysis by means of a Nafion dryer. |
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Wind direction: 1 Wind speed: 1 Relative humidity: 1 Precipitation amount: 0 Air pressure: 1 Air temperature: 1 Dew point temperature: 0 Sea water temperature: 0 Sea surface water temperature: 0 Sea water salinity: 0 Sea surface water salinity: 0 |
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Meteorological data may remain as first provided, even when greenhouse gas data are updated. Meteorological data at Jungfraujoch are measured by MeteoSwiss as part of its operation of the SwissMetNet Network. see www.meteoswiss.admin.ch/ and Appenzeller et al., Monitoring climate at Jungfraujoch in the high Swiss Alpine region, Science of The Total Environment, 391 (2-3), 262-268, https://doi.org/10.1016/j.scitotenv.2007.10.005 for more information. |
DOI Metadata
| DOI |
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| Version |
2024-04-15-0729 (Data Version History) * DOIs and file names may have multiple versions. Be sure to check the data version. |
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| Title | Atmospheric CH4 at Jungfraujoch by Swiss Federal Laboratories for Materials Science and Technology, dataset published as CH4_JFJ_surface-insitu_Empa_data1 at WDCGG | ||||||||||||||||
| Creator |
Swiss Federal Laboratories for Materials Science and Technology Martin Steinbacher (Empa) |
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| Publisher | World Data Centre for Greenhouse Gases | ||||||||||||||||
| Publication Date | 2018-07-06 (Last Updated: 2024-04-18) | ||||||||||||||||
| Format | Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF | ||||||||||||||||
| Relation List (Is Part Of) |
All CH4 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2022-09-07 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2021-08-27 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2018-10-25 |
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GAW Data Policy
"For Scientific purposes, access to these data is unlimited and provided without charge.
By their use you accept that an offer of co-authorship will be made through personal contact with the data providers
or owners whenever substantial use is made of their data.
In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."
Citation format
This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Please follow the citation format which the data providers or owners indicate.
Martin Steinbacher (Empa),
Atmospheric CH4
at Jungfraujoch by Swiss Federal Laboratories for Materials Science and Technology
,
dataset published as CH4_JFJ_
surface-insitu_Empa_data1 at WDCGG,
ver. 2024-04-15-0729, https://doi.org/10.50849/WDCGG_0023-6036-1002-01-01-9999 (Reference date*: YYYY/MM/DD)
* As the reference date, please indicate the date you downloaded the files.
* As the reference date, please indicate the date you downloaded the files.
Reference(s)
| 1 | Zellweger C., L. Emmenegger, M. Firdaus, J. Hatakka, M. Heimann, E. Kozlova, T. G. Spain, M. Steinbacher, M. V. van der Schoot, B. Buchmann, 2016 - Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations, Atmospheric Measurement Techniques, 9, 4737-4757, doi:10.5194/amt-9-4737-2016. |
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| 2 | Yver-Kwok C., C. Philippon, P. Bergamaschi, T. Biermann, F. Calzolari, H. Chen, S. Conil, P. Cristofanelli, M. Delmotte, J. Hatakka, M. Heliasz, O. Hermansen, K. Kominkova, D. Kubistin, N. Kumps, O. Laurent, T. Laurila, I. Lehner, J. Levula, M. Lindauer, M. Lopez, I. Mammarella, G. Manca, P. Marklund, J.-M. Metzger, M. Mölder, S. M. Platt, M. Ramonet, L. Rivier, B. Scheeren, M. K. Sha, P. Smith, M. Steinbacher, G. Vitkova, S. Wyss, 2021 - Evaluation and optimization of ICOS atmospheric station data as part of the labeling process, Atmospheric Measurement Techniques, 14, 89-116, https://doi.org/10.5194/amt-14-89-2021. |
