Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability
Dry-air column-averaged mole fractions of methane (XCH4) retrieved from ground-based solar Fourier transform infrared (FTIR) measurements provide valuable information for satellite validation, evaluation of chemical-transport models, and source-sink-inversions. In this context, Sussmann et al. (2013...
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Copernicus Publications
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ftubkarlsruhe:oai:EVASTAR-Karlsruhe.de:1000046047 2023-05-15T17:48:23+02:00 Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability Ostler, A. Sussmann, R. Rettinger, M. Deutscher, N. M. Dohe, S. Hase, F. Jones, N. Palm, M. Sinnhuber, B. M. 2015-03-02 application/pdf https://publikationen.bibliothek.kit.edu/1000046047 https://publikationen.bibliothek.kit.edu/1000046047/3434321 https://doi.org/10.5445/IR/1000046047 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-460477 eng eng Copernicus Publications info:eu-repo/semantics/altIdentifier/wos/000345782000004 info:eu-repo/semantics/altIdentifier/doi/10.5194/amt-7-4081-2014 info:eu-repo/semantics/altIdentifier/issn/1867-1381 info:eu-repo/semantics/altIdentifier/issn/1867-8548 https://publikationen.bibliothek.kit.edu/1000046047 https://publikationen.bibliothek.kit.edu/1000046047/3434321 https://doi.org/10.5445/IR/1000046047 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-460477 https://creativecommons.org/licenses/by/3.0/de/ info:eu-repo/semantics/openAccess CC-BY Atmospheric measurement techniques, 7 (12), 4081-4101 ISSN: 1867-1381, 1867-8548 ddc:550 Earth sciences info:eu-repo/classification/ddc/550 doc-type:article Text info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2015 ftubkarlsruhe https://doi.org/10.5445/IR/1000046047 https://doi.org/10.5194/amt-7-4081-2014 2022-03-23T18:44:04Z Dry-air column-averaged mole fractions of methane (XCH4) retrieved from ground-based solar Fourier transform infrared (FTIR) measurements provide valuable information for satellite validation, evaluation of chemical-transport models, and source-sink-inversions. In this context, Sussmann et al. (2013) have shown that midinfrared (MIR) soundings from the Network for the Detection of Atmospheric Composition Change (NDACC) can be combined with near-infrared (NIR) soundings from the Total Carbon Column Observing Network (TCCON) without the need to apply an overall intercalibration factor. However, in spite of efforts to reduce a priori impact, some residual seasonal biases were identified, and the reasons behind remained unclear. In extension to this previous work, which was based on multiannual quasi-coincident MIR and NIR measurements from the stations Garmisch (47.48° N, 11.06° E, 743 m a.s.l.) and Wollongong (34.41° S, 150.88° E, 30 m a.s.l.), we now investigate upgraded retrievals with longer temporal coverage and include three additional stations (Ny-Ålesund, 78.92° N, 11.93° E, 20 m a.s.l.; Karlsruhe, 49.08° N, 8.43° E, 110 m a.s.l.; Izaña, 28.31° N, 16.45° W, 2.370 m a.s.l.). Our intercomparison results (except for Ny-Ålesund) confirm that there is no overall bias between MIR and NIR XCH4 retrievals, and all MIR and NIR time series reveal a quasi-periodic seasonal bias for all stations, except for Izaña. We find that dynamical variability causes MIR–NIR differences of up to ~ 30 ppb (parts per billion) for Ny-Ålesund, ~ 20 ppb for Wollongong, ~ 18 ppb for Garmisch, and ~ 12 ppb for Karlsruhe. The mechanisms behind this variability are elaborated via two case studies, one dealing with stratospheric subsidence induced by the polar vortex at Ny-Ålesund and the other with a deep stratospheric intrusion event at Garmisch. Smoothing effects caused by the dynamical variability during these events are different for MIR and NIR retrievals depending on the altitude of the perturbation area. MIR retrievals appear to be ... Article in Journal/Newspaper Ny Ålesund Ny-Ålesund KITopen (Karlsruhe Institute of Technologie) Ny-Ålesund |
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Open Polar |
collection |
KITopen (Karlsruhe Institute of Technologie) |
op_collection_id |
ftubkarlsruhe |
language |
English |
topic |
ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
spellingShingle |
ddc:550 Earth sciences info:eu-repo/classification/ddc/550 Ostler, A. Sussmann, R. Rettinger, M. Deutscher, N. M. Dohe, S. Hase, F. Jones, N. Palm, M. Sinnhuber, B. M. Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
topic_facet |
ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
description |
Dry-air column-averaged mole fractions of methane (XCH4) retrieved from ground-based solar Fourier transform infrared (FTIR) measurements provide valuable information for satellite validation, evaluation of chemical-transport models, and source-sink-inversions. In this context, Sussmann et al. (2013) have shown that midinfrared (MIR) soundings from the Network for the Detection of Atmospheric Composition Change (NDACC) can be combined with near-infrared (NIR) soundings from the Total Carbon Column Observing Network (TCCON) without the need to apply an overall intercalibration factor. However, in spite of efforts to reduce a priori impact, some residual seasonal biases were identified, and the reasons behind remained unclear. In extension to this previous work, which was based on multiannual quasi-coincident MIR and NIR measurements from the stations Garmisch (47.48° N, 11.06° E, 743 m a.s.l.) and Wollongong (34.41° S, 150.88° E, 30 m a.s.l.), we now investigate upgraded retrievals with longer temporal coverage and include three additional stations (Ny-Ålesund, 78.92° N, 11.93° E, 20 m a.s.l.; Karlsruhe, 49.08° N, 8.43° E, 110 m a.s.l.; Izaña, 28.31° N, 16.45° W, 2.370 m a.s.l.). Our intercomparison results (except for Ny-Ålesund) confirm that there is no overall bias between MIR and NIR XCH4 retrievals, and all MIR and NIR time series reveal a quasi-periodic seasonal bias for all stations, except for Izaña. We find that dynamical variability causes MIR–NIR differences of up to ~ 30 ppb (parts per billion) for Ny-Ålesund, ~ 20 ppb for Wollongong, ~ 18 ppb for Garmisch, and ~ 12 ppb for Karlsruhe. The mechanisms behind this variability are elaborated via two case studies, one dealing with stratospheric subsidence induced by the polar vortex at Ny-Ålesund and the other with a deep stratospheric intrusion event at Garmisch. Smoothing effects caused by the dynamical variability during these events are different for MIR and NIR retrievals depending on the altitude of the perturbation area. MIR retrievals appear to be ... |
format |
Article in Journal/Newspaper |
author |
Ostler, A. Sussmann, R. Rettinger, M. Deutscher, N. M. Dohe, S. Hase, F. Jones, N. Palm, M. Sinnhuber, B. M. |
author_facet |
Ostler, A. Sussmann, R. Rettinger, M. Deutscher, N. M. Dohe, S. Hase, F. Jones, N. Palm, M. Sinnhuber, B. M. |
author_sort |
Ostler, A. |
title |
Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
title_short |
Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
title_full |
Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
title_fullStr |
Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
title_full_unstemmed |
Multistation intercomparison of column-averaged methane from NDACC and TCCON: impact of dynamical variability |
title_sort |
multistation intercomparison of column-averaged methane from ndacc and tccon: impact of dynamical variability |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://publikationen.bibliothek.kit.edu/1000046047 https://publikationen.bibliothek.kit.edu/1000046047/3434321 https://doi.org/10.5445/IR/1000046047 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-460477 |
geographic |
Ny-Ålesund |
geographic_facet |
Ny-Ålesund |
genre |
Ny Ålesund Ny-Ålesund |
genre_facet |
Ny Ålesund Ny-Ålesund |
op_source |
Atmospheric measurement techniques, 7 (12), 4081-4101 ISSN: 1867-1381, 1867-8548 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000345782000004 info:eu-repo/semantics/altIdentifier/doi/10.5194/amt-7-4081-2014 info:eu-repo/semantics/altIdentifier/issn/1867-1381 info:eu-repo/semantics/altIdentifier/issn/1867-8548 https://publikationen.bibliothek.kit.edu/1000046047 https://publikationen.bibliothek.kit.edu/1000046047/3434321 https://doi.org/10.5445/IR/1000046047 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-460477 |
op_rights |
https://creativecommons.org/licenses/by/3.0/de/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5445/IR/1000046047 https://doi.org/10.5194/amt-7-4081-2014 |
_version_ |
1766154260703084544 |