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Rapport Année : 2021

Ocean monitoring indicator (OMI) of the Copernicus marine environment monitoring service global yearly ocean CO$_2$ sink

Résumé

Since the onset of the industrial era in 1750, the atmospheric CO2 concentration has increased from about 277 ppm (Joos and Spahni, 2008) to 409.85 ± 0.1 ppm in 2019 (Dlugokencky and Tans, 2020). By 2011, the ocean had absorbed approximately 28 ± 5% of all anthropogenic CO2 emissions, thus providing negative feedback to global warming and climate change (Ciais et al., 2013). The ocean CO2 sink is evaluated every year as part of the Global Carbon Budget (Friedlingstein et al. 2020). The uptake of CO2 occurs primarily in response to increasing atmospheric levels. The global flux is characterized by a significant variability on interannual to decadal time scales largely in response to natural climate variability (e.g., ENSO) (Friedlingstein et al. 2020). The global yearly ocean CO2 sink represents the ocean uptake of CO2 from the atmosphere computed over the whole ocean. It is expressed in PgC per year. The ocean monitoring index is presented for the period 1985 to present. The yearly estimate of the ocean CO2 sink corresponds to the mean of a 100-member ensemble of CO2 flux estimates (Chau et al. 2022). The range of an estimate with the associated uncertainty is then defined by the empirical 68% interval computed from the ensemble.
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Dates et versions

hal-03826303 , version 1 (24-10-2022)
hal-03826303 , version 2 (10-08-2023)

Identifiants

Citer

Thi Tuyet Trang Chau, Marion Gehlen, Frederic Chevallier. Ocean monitoring indicator (OMI) of the Copernicus marine environment monitoring service global yearly ocean CO$_2$ sink. [Research Report] LSCE. 2021. ⟨hal-03826303v1⟩
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