Data/hora: 06/06/2024 11:21:22

Provedor de dados: | 5
País: | France

Título:

Caractérisation des effets du réchauffement climatique sur l'océan superficiel au cours des 50 dernières années

Characterization of the effects of global warming on the ocean surface layers over the last 50 years

Autores: | Hamon, Mathieu.
Data: | 2012-03-01
Ano: | 2012
Palavras-chave: | Réchauffement climatique; Observations in situ; Biais XBT; Reconstruction de champs; Contenu thermique; Contenu d’eau douce; Global warming; In situ measurement; XBT bias; Field reconstruction; Heat content; Freshwater content.
Resumo: | To identify and characterize the effects of global warming is one of the major scientific challenges of this new century. The rise of sea level, the hydrological changes are some consequences of this phenomenon which will influence all forms of life on Earth. Due to its high thermal capacity, it is estimated that 84% of the energy developed by global warming is stored in the first layers of the ocean. However, it is rather difficult to assess its overall impact over the last 50 years because the ocean is not warming uniformly and the inhomogeneous sampling (spatial and temporal) of oceanographic observations, instrumental errors (XBT) and biases related to the estimation process of global indicators can affect our assessment of the evolution of ocean parameters. To overcome these difficulties of in situ measurements analysis, we propose here an empirical correction of XBT data based on the analysis of collocated profiles, characterized by a parabolic function of the immersion of the probe and a thermal offset. From the corrected database, we present a new method for creating large-scale gridded fields based on the reconstruction of the natural modes of variability (DINEOF). Finally, we present the main results from these reconstructions in terms of global trends and variability of heat content and freshwater content. This work contributes to better document the oceanic variability in the 0-700m layer.
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00498/60957/64360.pdf

https://archimer.ifremer.fr/doc/00498/60957/

Editor: | Université de Bretagne occidentale
Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

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