10 Nov 2020
10 Nov 2020
Variability of North Atlantic CO2 fluxes for the 2000–2017 period
- 1School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
- 2College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, UK
- 3International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing,10029, China
- 4Department of Atmospheric and Oceanic Science, and Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, 20742, USA
- 1School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
- 2College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, UK
- 3International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing,10029, China
- 4Department of Atmospheric and Oceanic Science, and Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, 20742, USA
Abstract. We present new estimates of the regional North Atlantic (15° N–80° N) CO2 flux for the 2000–2017 period using atmospheric CO2 measurements from the NOAA long term surface site network in combination with an atmospheric data assimilation system (GEOSChem–LETKF). We also assess the sensitivity of flux estimates to the representation of the prior ocean flux distribution and to the associated specification of prior flux uncertainty, including a specification that is dependent on the agreement among the multiple representations of the prior ocean flux. Long term average flux estimates for the 2000–2017 period are −0.26±0.04 PgC y−1 for the subtropical basin (15° N–50° N), and −0.25±0.04 PgC y−1 for the subpolar region (50° N–80° N, west of 20° E). Our basin–scale estimates of the amplitude of interannual variability (IAV) are 0.037±0.006 PgC y−1 and 0.025±0.009 PgC y−1 for subtropical and subpolar regions respectively. We find a statistically significant trend in carbon uptake for the subtropical North Atlantic of −0.062±0.009 PgC y−1 decade−1 over this period.
Zhaohui Chen et al.


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RC1: 'Reviewer comments on Variability of North Atlantic CO2 fluxes for the 2000-2017 period', Anonymous Referee #1, 03 Dec 2020
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AC1: 'Reply on RC1', Zhaohui Chen, 22 Feb 2021
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AC1: 'Reply on RC1', Zhaohui Chen, 22 Feb 2021
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RC2: 'Review', Anonymous Referee #2, 18 Jan 2021
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AC2: 'Reply on RC2', Zhaohui Chen, 22 Feb 2021
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AC2: 'Reply on RC2', Zhaohui Chen, 22 Feb 2021
Zhaohui Chen et al.
Zhaohui Chen et al.
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