Data/hora: 05/06/2024 18:24:02

Provedor de dados: | 5
País: | France
Título: | Diagnosis of high-resolution upper ocean dynamics from noisy sea surface temperatures
Autores: | Isern-fontanet, J.; Hascoet, Erwan.
Data: | 2014-01
Ano: | 2014
Palavras-chave: | Sea surface temperature; Surface quasi-geostrophy; Remote sensing; Vertical velocity; Ocean submesoscales; Image denoising.
Resumo: | The noise present in infrared satellite measurements of sea surface temperature (SST) hampers the use of surface quasi-geostrophic (SQG) equations to diagnose ocean dynamics at high resolutions. Here we propose a methodology to reduce the contribution of noise when diagnosing surface vorticity, divergence, and vertical velocity from SST able to retain the dynamics at scales of a few kilometers. It is based on the use of denoising techniques with curvelets as basis functions and the application of a selective low-pass filters to improve the reconstruction of surface upwelling/downwelling patterns. First, it is tested using direct numerical simulations of SQG turbulence and then applied to diagnose low-frequency vertical velocity patterns from real MODIS (Moderate Resolution Imaging Spectroradiometer) images. The methodology here presented, which is not tied to the validity of SQG equations nor to the use of SST, is quite general and can be applied to a wide range of measurements and dynamical frameworks.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00170/28162/26391.pdf

DOI:10.1002/2013JC009176

Editor: | Amer Geophysical Union
Relação: | http://archimer.ifremer.fr/doc/00170/28162/
Formato: | application/pdf
Fonte: | Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2014-01 , Vol. 119 , N. 1 , P. 121-132
Fonte: | 2013. American Geophysical Union. All Rights Reserved.