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Caractérisation des effets du réchauffement climatique sur l'océan superficiel au cours des 50 dernières années ArchiMer
Hamon, Mathieu.
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...
Tipo: Text 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.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00498/60957/64360.pdf
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Coherent heat patterns revealed by unsupervised classification of Argo temperature profiles in the North Atlantic Ocean ArchiMer
Maze, Guillaume; Mercier, Herle; Fablet, Ronan; Tandeo, Pierre; Radcenco, Manuel Lopez; Lenca, Philippe; Feucher, Charlene; Le Goff, Clement.
A quantitative understanding of the integrated ocean heat content depends on our ability to determine how heat is distributed in the ocean and what are the associated coherent patterns. This study demonstrates how this can be achieved using unsupervised classification of Argo temperature profiles. The classification method used is a Gaussian Mixture Model (GMM) that decomposes the Probability Density Function of a dataset into a weighted sum of Gaussian modes. It is determined that the North Atlantic Argo dataset of temperature profiles con- tains 8 groups of vertically coherent heat patterns, or classes. Each of the temperature profile classes reveals unique and physically coherent heat distributions along the vertical axis. A key result of this study is...
Tipo: Text Palavras-chave: Heat content; Classification North Atlantic; Stratification; Water mass; Thermocline; Argo; Pattern.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00363/47431/47456.pdf
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Stratification structure in subtropical gyres and its decadal variability in the North Atlantic Ocean ArchiMer
Feucher, Charlene.
Subtropical gyres are central to the observed climate changes throughout the last decades. It is observed between the surface and the permanent pycnocline an intense increase in the ocean heat content. The permanent pycnocline delineates thus an important heat reservoir. The permanent pycnocline has a major role in preventing heat to reach the deep ocean and it thus of a relative importance in the context of climate change. For the first time and thanks to the development of the Argo array, we have been able to characterize the observed structure of the permanent pycnocline. The objective of this PhD thesis is to investigate the structure of the permanent pycnocline and its variability over the last decades. We developed an objective method to characterize...
Tipo: Text Palavras-chave: Pycnocline permanente; Stratification; Contenu de chaleur; Variabilité décennale; Argo; Réanalyses océaniques; Gyres subtropicaux; Atlantique nor; Permanent pycnocline; Stratification; Heat content; Decadal variability; Argo; Ocean reanalyses; Subtropical gyres; North Atlantic..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00366/47675/47721.pdf
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