Articles | Volume 16, issue 12
https://doi.org/10.5194/amt-16-3299-2023
https://doi.org/10.5194/amt-16-3299-2023
Research article
 | 
30 Jun 2023
Research article |  | 30 Jun 2023

Reducing errors on estimates of the carbon uptake period based on time series of atmospheric CO2

Theertha Kariyathan, Ana Bastos, Julia Marshall, Wouter Peters, Pieter Tans, and Markus Reichstein

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Cited articles

Bacastow, R. B., Keeling, C. D., and Whorf, T. P.: Seasonal amplitude increase in atmospheric CO2 concentration at Mauna Loa, Hawaii, 1959–1982, J. Geophys. Res.-Atmos., 90, 10529–10540, https://doi.org/10.1029/JD090iD06p10529, 1985. a, b
Barichivich, J., Briffa, K. R., Osborn, T. J., Melvin, T. M., and Caesar, J.: Thermal growing season and timing of biospheric carbon uptake across the Northern Hemisphere, Global Biogeochem. Cy., 26, GB4015​​​​​​​, https://doi.org/10.1029/2012GB004312, 2012. a, b, c, d, e, f, g
Barichivich, J., Briffa, K. R., Myneni, R. B., Osborn, T. J., Melvin, T. M., Ciais, P., Piao, S., and Tucker, C.: Large-scale variations in the vegetation growing season and annual cycle of atmospheric CO2 at high northern latitudes from 1950 to 2011, Glob. Change Biol., 19, 3167–83, https://doi.org/10.1111/gcb.12283, 2013. a
Barlow, J. M., Palmer, P. I., Bruhwiler, L. M., and Tans, P.: Analysis of CO2 mole fraction data: first evidence of large-scale changes in CO2 uptake at high northern latitudes, Atmos. Chem. Phys., 15, 13739–13758, https://doi.org/10.5194/acp-15-13739-2015, 2015. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w
Barlow, J. M., Palmer, P. I., and Bruhwiler, L. M.: Increasing boreal wetland emissions inferred from reductions in atmospheric CH4 seasonal cycle, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2016-752, in review, 2016. a
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The timing and duration of the carbon uptake period (CUP) are sensitive to the occurrence of major phenological events, which are influenced by recent climate change. This study presents an ensemble-based approach for quantifying the timing and duration of the CUP and their uncertainty when derived from atmospheric CO2 measurements with noise and gaps. The CUP metrics derived with the approach are more robust and have less uncertainty than when estimated with the conventional methods.