Reconstruction of super-resolution ocean pCO2 and air-sea fluxes of CO2 from satellite imagery in the southeastern Atlantic

• Verfasst von: Hernández-Carrasco, Ismael [VerfasserIn]
• Verfasst von: Sudre, J. [VerfasserIn]
• Verfasst von: Garçon, V. [VerfasserIn]
• Verfasst von: Yahia, H. [VerfasserIn]
• Verfasst von: Garbe, Christoph S. [VerfasserIn]
• Verfasst von: Paulmier, A. [VerfasserIn]
• Verfasst von: Dewitte, B. [VerfasserIn]
• Verfasst von: Illig, S. [VerfasserIn]
• Verfasst von: Dadou, I. [VerfasserIn]
• Verfasst von: González-Dávila, M. [VerfasserIn]
• Verfasst von: Santana-Casiano, J. M. [VerfasserIn]
• Titel: Reconstruction of super-resolution ocean pCO2 and air-sea fluxes of CO2 from satellite imagery in the southeastern Atlantic
• Verf.angabe: I. Hernández-Carrasco, J. Sudre, V. Garçon, H. Yahia, C. Garbe, A. Paulmier, B. Dewitte, S. Illig, I. Dadou, M. González-Dávila, J M. Santana-Casiano
• E-Jahr: 2015
• Jahr: 11 September 2015
• Umfang: 17 S.
• Fussnoten: Gesehen am 25.08.2020 ; Im Titel ist die Zahl "2" tiefgestellt
• Titel Quelle: Enthalten in: Biogeosciences discussions
• Ort Quelle: Katlenburg-Lindau [u.a.] : Copernicus, 2004
• Jahr Quelle: 2015
• Band/Heft Quelle: 12(2015), 17, Seite 5229-5245
• ISSN Quelle: 1810-6285
• DOI: doi:10.5194/bg-12-5229-2015
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1727732685

Abstract

<p><strong>Abstract.</strong> An accurate quantification of the role of the ocean as source/sink of greenhouse gases (GHGs) requires to access the high-resolution of the GHG air-sea flux at the interface. In this paper we present a novel method to reconstruct maps of surface ocean partial pressure of CO₂ ( <i>p</i>CO₂) and air-sea CO₂ fluxes at super resolution (4 km, i.e., 1/32° at these latitudes) using sea surface temperature (SST) and ocean color (OC) data at this resolution, and CarbonTracker CO₂ fluxes data at low resolution (110 km). Inference of super-resolution <i>p</i>CO₂ and air-sea CO₂ fluxes is performed using novel nonlinear signal processing methodologies that prove efficient in the context of oceanography. The theoretical background comes from the microcanonical multifractal formalism which unlocks the geometrical determination of cascading properties of physical intensive variables. As a consequence, a multi-resolution analysis performed on the signal of the so-called singularity exponents allows for the correct and near optimal cross-scale inference of GHG fluxes, as the inference suits the geometric realization of the cascade. We apply such a methodology to the study offshore of the Benguela area. The inferred representation of oceanic partial pressure of CO₂ improves and enhances the description provided by CarbonTracker, capturing the small-scale variability. We examine different combinations of ocean color and sea surface temperature products in order to increase the number of valid points and the quality of the inferred <i>p</i>CO₂ field. The methodology is validated using in situ measurements by means of statistical errors. We find that mean absolute and relative errors in the inferred values of <i>p</i>CO₂ with respect to in situ measurements are smaller than for CarbonTracker.</p>