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Preprints
https://doi.org/10.5194/essd-2020-90
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-90
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 May 2020

06 May 2020

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A revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

A uniform pCO2 climatology combining open and coastal oceans

Peter Landschützer1, Goulven G. Laruelle2, Alizee Roobaert2, and Pierre Regnier2 Peter Landschützer et al.
  • 1Max Planck Institute for Meteorology, Hamburg, Germany
  • 2Department Geoscience, Environment & Society (DGES), Université Libre de Bruxelles, Brussels, CP16002, Belgium

Abstract. In this study, we present the first combined open and coastal ocean pCO2 mapped monthly climatology (Landschützer et al. (2020), doi:10.25921/qb25-f418, https://www.nodc.noaa.gov/ocads/oceans/MPI-ULB-SOM_FFN_clim.html) constructed from observations collected between 1998 and 2015 extracted from the Surface Ocean CO2 Atlas (SOCAT) database. We combine two neural network-based pCO2 products, one from the open ocean and the other from the coastal ocean, and investigate their consistency along their common overlap areas. While the difference between open and coastal ocean estimates along the overlap area increases with latitude, it remains close to 0 μatm globally. Stronger discrepancies, however, exist on the regional level resulting in differences that exceed 10 % of the climatological mean pCO2, or an order of magnitude larger than the uncertainty from state of the art measurements. This also illustrates the potential of such analysis to inform the measurement community about the locations where additional measurements are essential to better represent the aquatic continuum and improve our understanding of the carbon exchange at the air water interface. A regional analysis further shows that the seasonal carbon dynamics at the coast-open interface are well represented in our climatology. While our combined product is only a first step towards a true representation of both the open ocean and the coastal ocean air-sea CO2 flux in marine carbon budgets, we show it is a feasible task and the present data product already constitutes a valuable tool to investigate and quantify the dynamics of the air-sea CO2 exchange consistently for oceanic regions regardless of its distance to the coast.

Peter Landschützer et al.

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Peter Landschützer et al.

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A combined global ocean pCO2 climatology combining open ocean and coastal areas P. Landschützer, G. Laruelle, A. Roobaert, and P. Regnier https://doi.org/10.25921/qb25-f418

Peter Landschützer et al.

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Short summary
In recent years, multiple estimates of the global air-sea CO2 flux emerged from upscaling shipboard pCO2 measurements. They are however limited to the open ocean domain and do not consider the coastal ocean, i.e. a significant marine sink for CO2. We build towards an integrated pCO2 product that combines both the open ocean and coastal ocean domain and focus on the evaluation of the common overlap area of these products and how well the aquatic continuum is represented in the new climatology.
In recent years, multiple estimates of the global air-sea CO2 flux emerged from upscaling...
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