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Showing content from https://pubmed.ncbi.nlm.nih.gov/29255277/ below:

Satellite Observations of Imprint of Oceanic Current on Wind Stress by Air-Sea Coupling

. 2017 Dec 18;7(1):17747. doi: 10.1038/s41598-017-17939-1. Satellite Observations of Imprint of Oceanic Current on Wind Stress by Air-Sea Coupling

Affiliations

¹ Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA. lrenault@ucla.edu.
² LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS,, Toulouse, France. lrenault@ucla.edu.
³ Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA.
⁴ Sorbonne Universites (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, 4 place Jussieu, 75005, Paris, France.

PMID: 29255277
PMCID: PMC5735162
DOI: 10.1038/s41598-017-17939-1

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Satellite Observations of Imprint of Oceanic Current on Wind Stress by Air-Sea Coupling

Lionel Renault et al. Sci Rep. 2017.

. 2017 Dec 18;7(1):17747. doi: 10.1038/s41598-017-17939-1. Affiliations

¹ Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA. lrenault@ucla.edu.
² LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS,, Toulouse, France. lrenault@ucla.edu.
³ Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA.
⁴ Sorbonne Universites (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, 4 place Jussieu, 75005, Paris, France.

PMID: 29255277
PMCID: PMC5735162
DOI: 10.1038/s41598-017-17939-1

Item in Clipboard

Abstract

Mesoscale eddies are present everywhere in the ocean and partly determine the mean state of the circulation and ecosystem. The current feedback on the surface wind stress modulates the air-sea transfer of momentum by providing a sink of mesoscale eddy energy as an atmospheric source. Using nine years of satellite measurements of surface stress and geostrophic currents over the global ocean, we confirm that the current-induced surface stress curl is linearly related to the current vorticity. The resulting coupling coefficient between current and surface stress (s_τ [N s m^-3]) is heterogeneous and can be roughly expressed as a linear function of the mean surface wind. s_τ expresses the sink of eddy energy induced by the current feedback. This has important implications for air-sea interaction and implies that oceanic mean and mesoscale circulations and their effects on surface-layer ventilation and carbon uptake are better represented in oceanic models that include this feedback.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures
Figure 1

Global satellite observations allow monitoring…

Figure 1

Global satellite observations allow monitoring mesoscale oceanic currents as illustrated here by the…

Figure 1

Global satellite observations allow monitoring mesoscale oceanic currents as illustrated here by the EKE estimated from the AVISO geostrophic currents. The gray color masks the equatorial region where geostrophic approximation is not reliable. The Figure has been generated using Matlab R2014b ( https://www.mathworks.com/ ) and E.U. Copernicus Marine Service Information data (AVISO).

Figure 2

The current feedback to the…

Figure 2

The current feedback to the atmosphere induces persistent surface stress anomalies that can…

Figure 2

The current feedback to the atmosphere induces persistent surface stress anomalies that can be expressed as a linear relationship. It causes a sink of energy from geostrophic currents. (a) Coupling coefficient s _τ between surface geostrophic current and surface stress. (b) Binned scatterplot of the full time series of 10m-wind magnitude and s _τ over the World Ocean. The bars indicate plus and minus one standard deviation about the mean marked by stars. The linear regression is indicated by a black line, and the slope is indicated in the title. (c) Predicted s _τ = (−2.5 10⁻³|U _a| + 0.013 m s⁻¹) N s ² m ⁻⁴ (see text). The Figure has been realized using Matlab R2014b ( https://www.mathworks.com/ ) and data from QuikSCAT V3 product (CERSAT, IFREMER) and E.U. Copernicus Marine Service Information data (AVISO).

Figure 3

( a ) Mean eddy…

Figure 3

( a ) Mean eddy wind work ( F _e K _e )…

Figure 3

(a) Mean eddy wind work (F _e K _e) estimated using a temporal filter (91 days). (b) Predicted F _e K _ep = (2)/(ρ _o)s _τ EKE using the seasonal values of s _τ and EKE. A negative F _e K _e indicates a transfer of energy from the oceanic eddies to the atmosphere. It induces a damping of the eddies. The Figure has been realized using Matlab R2014b ( https://www.mathworks.com/ ) and data from QuikSCAT V3 product (CERSAT, IFREMER) and E.U. Copernicus Marine Service Information data (AVISO).