Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses
We present new estimates of the regional North Atlantic (15–80 ∘ N) CO 2 flux for the 2000–2017 period using atmospheric CO 2 measurements from the NOAA long-term surface site network in combination with an atmospheric carbon cycle data assimilation system (GEOS-Chem–LETKF, Local Ensemble Transform...
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ftcopernicus:oai:publications.copernicus.org:bg90396 2023-05-15T17:29:46+02:00 Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses Chen, Zhaohui Suntharalingam, Parvadha Watson, Andrew J. Schuster, Ute Zhu, Jiang Zeng, Ning 2021-08-09 application/pdf https://doi.org/10.5194/bg-18-4549-2021 https://bg.copernicus.org/articles/18/4549/2021/ eng eng doi:10.5194/bg-18-4549-2021 https://bg.copernicus.org/articles/18/4549/2021/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-18-4549-2021 2021-08-16T16:22:29Z We present new estimates of the regional North Atlantic (15–80 ∘ N) CO 2 flux for the 2000–2017 period using atmospheric CO 2 measurements from the NOAA long-term surface site network in combination with an atmospheric carbon cycle data assimilation system (GEOS-Chem–LETKF, Local Ensemble Transform Kalman Filter). We assess the sensitivity of flux estimates to alternative ocean CO 2 prior flux distributions and to the specification of uncertainties associated with ocean fluxes. We present a new scheme to characterize uncertainty in ocean prior fluxes, derived from a set of eight surface p CO 2 -based ocean flux products, and which reflects uncertainties associated with measurement density and p CO 2 -interpolation methods. This scheme provides improved model performance in comparison to fixed prior uncertainty schemes, based on metrics of model–observation differences at the network of surface sites. Long-term average posterior flux estimates for the 2000–2017 period from our GEOS-Chem–LETKF analyses are − 0.255 ± 0.037 PgC yr −1 for the subtropical basin (15–50 ∘ N) and − 0.203 ± 0.037 PgC yr −1 for the subpolar region (50–80 ∘ N, eastern boundary at 20 ∘ E). Our basin-scale estimates of interannual variability (IAV) are 0.036 ± 0.006 and 0.034 ± 0.009 PgC yr −1 for subtropical and subpolar regions, respectively. We find statistically significant trends in carbon uptake for the subtropical and subpolar North Atlantic of − 0.064 ± 0.007 and − 0.063 ± 0.008 PgC yr −1 decade −1 these trends are of comparable magnitude to estimates from surface ocean p CO 2 -based flux products, but they are larger, by a factor of 3–4, than trends estimated from global ocean biogeochemistry models. Text North Atlantic Copernicus Publications: E-Journals Biogeosciences 18 15 4549 4570 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We present new estimates of the regional North Atlantic (15–80 ∘ N) CO 2 flux for the 2000–2017 period using atmospheric CO 2 measurements from the NOAA long-term surface site network in combination with an atmospheric carbon cycle data assimilation system (GEOS-Chem–LETKF, Local Ensemble Transform Kalman Filter). We assess the sensitivity of flux estimates to alternative ocean CO 2 prior flux distributions and to the specification of uncertainties associated with ocean fluxes. We present a new scheme to characterize uncertainty in ocean prior fluxes, derived from a set of eight surface p CO 2 -based ocean flux products, and which reflects uncertainties associated with measurement density and p CO 2 -interpolation methods. This scheme provides improved model performance in comparison to fixed prior uncertainty schemes, based on metrics of model–observation differences at the network of surface sites. Long-term average posterior flux estimates for the 2000–2017 period from our GEOS-Chem–LETKF analyses are − 0.255 ± 0.037 PgC yr −1 for the subtropical basin (15–50 ∘ N) and − 0.203 ± 0.037 PgC yr −1 for the subpolar region (50–80 ∘ N, eastern boundary at 20 ∘ E). Our basin-scale estimates of interannual variability (IAV) are 0.036 ± 0.006 and 0.034 ± 0.009 PgC yr −1 for subtropical and subpolar regions, respectively. We find statistically significant trends in carbon uptake for the subtropical and subpolar North Atlantic of − 0.064 ± 0.007 and − 0.063 ± 0.008 PgC yr −1 decade −1 these trends are of comparable magnitude to estimates from surface ocean p CO 2 -based flux products, but they are larger, by a factor of 3–4, than trends estimated from global ocean biogeochemistry models. |
format |
Text |
author |
Chen, Zhaohui Suntharalingam, Parvadha Watson, Andrew J. Schuster, Ute Zhu, Jiang Zeng, Ning |
spellingShingle |
Chen, Zhaohui Suntharalingam, Parvadha Watson, Andrew J. Schuster, Ute Zhu, Jiang Zeng, Ning Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
author_facet |
Chen, Zhaohui Suntharalingam, Parvadha Watson, Andrew J. Schuster, Ute Zhu, Jiang Zeng, Ning |
author_sort |
Chen, Zhaohui |
title |
Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
title_short |
Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
title_full |
Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
title_fullStr |
Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
title_full_unstemmed |
Variability of North Atlantic CO2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
title_sort |
variability of north atlantic co2 fluxes for the 2000–2017 period estimated from atmospheric inverse analyses |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-4549-2021 https://bg.copernicus.org/articles/18/4549/2021/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-18-4549-2021 https://bg.copernicus.org/articles/18/4549/2021/ |
op_doi |
https://doi.org/10.5194/bg-18-4549-2021 |
container_title |
Biogeosciences |
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18 |
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15 |
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4549 |
op_container_end_page |
4570 |
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1766124568739577856 |