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Theses

Les échanges océan-atmosphère dans l'Atlantique subtropical nord-est : apports de Météosat

Abstract : The present work deals with exchanges in energy and matter and especially heat budget at the ocean surface in the Northeast Subtropical Atlantic Ocean. The shortwave downwelling flux is a prominent term in the budget and may be assessed by the method Heliosat applied to low resolution images acquired by the Meteosat satellite. At meso-scale, we show the great variability of the shortwave flux on hourly basis. Satisfactory results are obtained when comparing our estimates to in situ measurements. Eight semi-empirical formulae are compared to measurements or climatological averages of net longwave flux. A method has been developed exploiting Meteosat data. It reveals less accurate than the best semi-empirical formulae. Types of skies are defined as a function of the total cloud cover. The impact of the cloud cover of radiative fluxes is analyzed. Climatological averages of surface fluxes are computed in order to compute the net heat flux and its zonal variation during the months of September and October. The last part deals with three specific meteorological conditions. Using in situ measurements, we assess the impact of the variability in space and time on the computation of the budget. Noticeable changes in estimated fluxes are evidenced as a function of time scales and as a function of the spatial undersampling used in the construction of the low resolution images.
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https://pastel.archives-ouvertes.fr/pastel-00956592
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Submitted on : Thursday, March 6, 2014 - 7:45:11 PM
Last modification on : Wednesday, October 14, 2020 - 4:02:21 AM
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  • HAL Id : pastel-00956592, version 1

Citation

Olivier Bauer. Les échanges océan-atmosphère dans l'Atlantique subtropical nord-est : apports de Météosat. Océan, Atmosphère. Université de Nice Sophia-Antipolis, 1996. Français. ⟨pastel-00956592⟩

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