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Provedor de dados:  ArchiMer
País:  France
Título:  Estimating dense water volume and its evolution for the year 2012-2013 in the Northwestern Mediterranean Sea: An observing system simulation experiment approach
Autores:  Waldman, Robin
Somot, Samuel
Herrmann, Marine
Testor, Pierre
Estournel, Claude
Sevault, Florence
Prieur, Louis
Mortier, Laurent
Coppola, Laurent
Taillandier, Vincent
Conan, Pascal
Dausse, Denis
Data:  2016-09
Ano:  2016
Resumo:  The Northwestern Mediterranean (NWMed) Sea includes one of the best observed ocean deep convection sites in the World. An observing system simulation experiment (OSSE) is developed to provide a methodology for estimating observing network errors. It is applied to quantify dense water volumes in the NWMed during 2012–2013 with their observation error from MOOSE network. Results from the OSSE show low spatiotemporal sampling errors, which confirms MOOSE network ability to measure dense waters. However, results are highly sensitive to instrumental stability. The dense water volume is then estimated in observations from four ship cruises between summers 2012 and 2013. A large seasonal cycle is found, maximal in spring 2013 and dominated by the area west of 6.5°E. The dense water volume ( inline image) is stable between summer 2012 ( inline image) and winter 2013 ( inline image). It increases dramatically in spring 2013 ( inline image) due to an intense convective event, and it finally decreases rapidly in summer 2013 ( inline image) due to restratification and spreading. We estimate an open-sea dense water formation (DWF) rate of inline image between summer 2012 and spring 2013 over the studied area, extrapolated to inline image over the whole NWMed Sea and for the optimal timing. This is to our knowledge the highest measured DWF rate, suggesting winter 2013 was exceptionally convective. The observed restratification rate between spring and summer 2013 is inline image. This study provides robust quantifications of deep convection during an exceptional event that will allow to evaluate numerical simulations.
Tipo:  Text
Idioma:  Inglês

Editor:  Wiley-Blackwell
Formato:  application/pdf
Fonte:  Journal of Geophysical Research: Oceans (21699275) (Wiley-Blackwell) In Press
Direitos:  2016. American Geophysical Union. All Rights Reserved.


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