Surface ocean

Global ocean CO2 uptake from observations : an uncertainty analysis

In past decades, the magnitude of the ocean carbon sink was mainly estimated from global ocean biogeochemistry models and atmospheric inverse models but the recent increase in oceanic CO2 measurements and the creation of the Surface Ocean CO2 Atlas (SOCAT) database has opened new research avenues, including the possibility to monitor the temporal evolution of the global oceanic carbon sink based on surface ocean CO2 measurements covering the open ocean, marginal seas and coastal waters. Together with colleagues at MPI Meteorology-Hamburg, we perform an extensive assessment of global and regional flux uncertainty estimates to help better constrain the ocean carbon uptake based on observations.

This analysis is particularly relevant for global carbon budget analysis since to date the quantification of the global land sink is still largely dependent on the quantification of the ocean carbon uptake.

Relevant project(s): C-CASCADES

People involved: Alizée Roobaert, Goulven Laruelle, Pierre Regnier





Uncertainty in global air-sea CO2 flux induced by k formulations and wind forcing : distributions of oceanic air–sea mean FCO2 (mol C m−2 yr−1) generated from a 21 year climatology (1991–2011) using the Wanninkhof et al. (2009) k parametrization combined with NCEP1 (a) and the Sweeney et al. (2007) k relationship combined with NCEP2 (b).

From Roobaert et al., 2018

Atmospheric dust and iron fertilization of oceans

Impact of ocean acidification and warming on phytoplankton (calcifiers and silicifiers) and diazotroph communities