Data/hora: 11/06/2024 01:25:27

Provedor de dados: 	5	
País: 	France	
Título: 	Refroidissements locaux aux abords du talus continental Armoricain	
Autores: 	Langlois, Gilbert; Gohin, Francis; Serpette, Alain.	
Data: 	1990	
Ano: 	1990	
Palavras-chave: 	Ondes internes; Talus continental; Température superficielle; Télédétection; Analyse objective; Internal waves; Continental shelf; Sea-surface temperature; Teledetection; Objective analysis.	
Resumo: 	Infrared measurement at the sea surface, which constitutes an operational technology in remote-sensing, has become essential for the study of ocean dynamics. Nevertheless, observations are only usable when clouds do not mask infrared radiation coming from the ocean, a condition which rarely pertains in the Bay of Biscay as a whole. lt is consequently a matter of primary concern to have at one's disposai an effective method which permits the computation of mean SST fields from a chronological succession of incomplete images. In the case under consideration, "kriging" is the most widely practised method of performing geostatistical estimates. Before mapping isotherms, temperatures are estimated by interpolation on a regular gridnet. The process was applied to two sets of NOAA-AVHRR data from July 1987 in the northern area of the Bay of Biscay. The two situations produced during neap and spring tides show a permanent cold spot of water situated at 47"30'N-6°W. During the spring tides period, a second cold spot appears to the west of the first. The second part of this study investigates the creation of mixed cold waters along the shelf-break with the help of a numerical simulation of internai wave generation and propagation in the Bay of Biscay. Using a two-layer schematization of the ocean (Serpette and Mazé, 1989), this model permits the prediction of baroclinic oscillations induced by the barotropic tide acting over the shelf-break. Mechanical mixing in the upper layer due to current shears at the depth of the thermocline is shown to be especially effective when internai waves are in a state of growth, this phenomenon inducing the establishment of mixed cold waters along the shelf-break.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00131/24236/22229.pdf	
Editor: 	Gauthier-Villars	
Relação: 	http://archimer.ifremer.fr/doc/00131/24236/	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-Villars), 1990 , Vol. 13 , N. 2 , P. 159-169	
Fonte: 	Gauthier-Villars