Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions
Satellite-based observations of atmospheric carbon dioxide (COâ‚‚) provide measurements in remote regions, such as the biologically sensitive but undersampled northern high latitudes, and are progressing toward true global data coverage. Recent improvements in satellite retrievals of total column-av...
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European Geosciences Union
2021
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ftcaltechauth:oai:authors.library.caltech.edu:z9nz9-jtf65 2024-06-23T07:57:19+00:00 Spatial distributions of X_(CO₂) seasonal cycle amplitude and phase over northern high-latitude regions Jacobs, Nicole Simpson, William R. Graham, Kelly A. Holmes, Christopher Hase, Frank Blumenstock, Thomas Tu, Qiansi Frey, Matthias Dubey, Manvendra K. Parker, Harrison A. Wunch, Debra Kivi, Rigel Heikkinen, Pauli Notholt, Justus Petri, Christof Warneke, Thorsten 2021-11-16 https://doi.org/10.5194/acp-21-16661-2021 unknown European Geosciences Union https://doi.org/10.5194/acp-21-16661-2021-supplement https://daac.gsfc.nasa.gov/ https://tccondata.org/ https://doi.org/10.3334/ORNLDAAC/1831 https://ads.atmosphere.copernicus.eu/cdsapp#!/dataset/cams-global-greenhouse-gas-inversion https://doi.org/10.5281/zenodo.3701669 https://doi.org/10.5281/zenodo.5640670 https://doi.org/10.5194/acp-21-16661-2021 oai:authors.library.caltech.edu:z9nz9-jtf65 eprintid:112317 resolverid:CaltechAUTHORS:20211208-951551000 info:eu-repo/semantics/openAccess Other Atmospheric Chemistry and Physics, 21(22), 16661-16687, (2021-11-16) Atmospheric Science info:eu-repo/semantics/article 2021 ftcaltechauth https://doi.org/10.5194/acp-21-16661-202110.5194/acp-21-16661-2021-supplement10.3334/ORNLDAAC/183110.5281/zenodo.370166910.5281/zenodo.5640670 2024-06-12T06:30:48Z Satellite-based observations of atmospheric carbon dioxide (CO₂) provide measurements in remote regions, such as the biologically sensitive but undersampled northern high latitudes, and are progressing toward true global data coverage. Recent improvements in satellite retrievals of total column-averaged dry air mole fractions of CO₂ (X_(CO₂)) from the NASA Orbiting Carbon Observatory 2 (OCO-2) have allowed for unprecedented data coverage of northern high-latitude regions, while maintaining acceptable accuracy and consistency relative to ground-based observations, and finally providing sufficient data in spring and autumn for analysis of satellite-observed X_(CO₂) seasonal cycles across a majority of terrestrial northern high-latitude regions. Here, we present an analysis of X_(CO₂) seasonal cycles calculated from OCO-2 data for temperate, boreal, and tundra regions, subdivided into 5∘ latitude by 20∘ longitude zones. We quantify the seasonal cycle amplitudes (SCAs) and the annual half drawdown day (HDD). OCO-2 SCAs are in good agreement with ground-based observations at five high-latitude sites, and OCO-2 SCAs show very close agreement with SCAs calculated for model estimates of X_(CO₂) from the Copernicus Atmosphere Monitoring Services (CAMS) global inversion-optimized greenhouse gas flux model v19r1 and the CarbonTracker2019 model (CT2019B). Model estimates of X_(CO₂) from the GEOS-Chem CO₂ simulation version 12.7.2 with underlying biospheric fluxes from CarbonTracker2019 (GC-CT2019) yield SCAs of larger magnitude and spread over a larger range than those from CAMS, CT2019B, or OCO-2; however, GC-CT2019 SCAs still exhibit a very similar spatial distribution across northern high-latitude regions to that from CAMS, CT2019B, and OCO-2. Zones in the Asian boreal forest were found to have exceptionally large SCA and early HDD, and both OCO-2 data and model estimates yield a distinct longitudinal gradient of increasing SCA from west to east across the Eurasian continent. In northern ... Article in Journal/Newspaper Tundra Caltech Authors (California Institute of Technology) |
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Open Polar |
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Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
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topic |
Atmospheric Science |
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Atmospheric Science Jacobs, Nicole Simpson, William R. Graham, Kelly A. Holmes, Christopher Hase, Frank Blumenstock, Thomas Tu, Qiansi Frey, Matthias Dubey, Manvendra K. Parker, Harrison A. Wunch, Debra Kivi, Rigel Heikkinen, Pauli Notholt, Justus Petri, Christof Warneke, Thorsten Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
topic_facet |
Atmospheric Science |
description |
Satellite-based observations of atmospheric carbon dioxide (CO₂) provide measurements in remote regions, such as the biologically sensitive but undersampled northern high latitudes, and are progressing toward true global data coverage. Recent improvements in satellite retrievals of total column-averaged dry air mole fractions of CO₂ (X_(CO₂)) from the NASA Orbiting Carbon Observatory 2 (OCO-2) have allowed for unprecedented data coverage of northern high-latitude regions, while maintaining acceptable accuracy and consistency relative to ground-based observations, and finally providing sufficient data in spring and autumn for analysis of satellite-observed X_(CO₂) seasonal cycles across a majority of terrestrial northern high-latitude regions. Here, we present an analysis of X_(CO₂) seasonal cycles calculated from OCO-2 data for temperate, boreal, and tundra regions, subdivided into 5∘ latitude by 20∘ longitude zones. We quantify the seasonal cycle amplitudes (SCAs) and the annual half drawdown day (HDD). OCO-2 SCAs are in good agreement with ground-based observations at five high-latitude sites, and OCO-2 SCAs show very close agreement with SCAs calculated for model estimates of X_(CO₂) from the Copernicus Atmosphere Monitoring Services (CAMS) global inversion-optimized greenhouse gas flux model v19r1 and the CarbonTracker2019 model (CT2019B). Model estimates of X_(CO₂) from the GEOS-Chem CO₂ simulation version 12.7.2 with underlying biospheric fluxes from CarbonTracker2019 (GC-CT2019) yield SCAs of larger magnitude and spread over a larger range than those from CAMS, CT2019B, or OCO-2; however, GC-CT2019 SCAs still exhibit a very similar spatial distribution across northern high-latitude regions to that from CAMS, CT2019B, and OCO-2. Zones in the Asian boreal forest were found to have exceptionally large SCA and early HDD, and both OCO-2 data and model estimates yield a distinct longitudinal gradient of increasing SCA from west to east across the Eurasian continent. In northern ... |
format |
Article in Journal/Newspaper |
author |
Jacobs, Nicole Simpson, William R. Graham, Kelly A. Holmes, Christopher Hase, Frank Blumenstock, Thomas Tu, Qiansi Frey, Matthias Dubey, Manvendra K. Parker, Harrison A. Wunch, Debra Kivi, Rigel Heikkinen, Pauli Notholt, Justus Petri, Christof Warneke, Thorsten |
author_facet |
Jacobs, Nicole Simpson, William R. Graham, Kelly A. Holmes, Christopher Hase, Frank Blumenstock, Thomas Tu, Qiansi Frey, Matthias Dubey, Manvendra K. Parker, Harrison A. Wunch, Debra Kivi, Rigel Heikkinen, Pauli Notholt, Justus Petri, Christof Warneke, Thorsten |
author_sort |
Jacobs, Nicole |
title |
Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
title_short |
Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
title_full |
Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
title_fullStr |
Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
title_full_unstemmed |
Spatial distributions of X_(COâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
title_sort |
spatial distributions of x_(coâ‚‚) seasonal cycle amplitude and phase over northern high-latitude regions |
publisher |
European Geosciences Union |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-16661-2021 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Atmospheric Chemistry and Physics, 21(22), 16661-16687, (2021-11-16) |
op_relation |
https://doi.org/10.5194/acp-21-16661-2021-supplement https://daac.gsfc.nasa.gov/ https://tccondata.org/ https://doi.org/10.3334/ORNLDAAC/1831 https://ads.atmosphere.copernicus.eu/cdsapp#!/dataset/cams-global-greenhouse-gas-inversion https://doi.org/10.5281/zenodo.3701669 https://doi.org/10.5281/zenodo.5640670 https://doi.org/10.5194/acp-21-16661-2021 oai:authors.library.caltech.edu:z9nz9-jtf65 eprintid:112317 resolverid:CaltechAUTHORS:20211208-951551000 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.5194/acp-21-16661-202110.5194/acp-21-16661-2021-supplement10.3334/ORNLDAAC/183110.5281/zenodo.370166910.5281/zenodo.5640670 |
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1802650894072807424 |