Accueil > Actualités > Séminaires > Séminaire de Andrew Friedman au LMD-ENS


Titre : Decadal behavior of the interhemispheric SST contrast: contextualizing the late 1960s – early 1970s shift
Nom du conférencier : Andrew Friedman
Son affiliation : Univ Edinburgh
Laboratoire organisateur : LMD
Date et heure : 11-03-2020 11h00
Lieu : Salle SERRE - 24 rue Lhomond - 5ème étage (accès au bout du 3ème étage Erasme - bouton ascenseur 6)
Résumé :

The SST contrast between the northern and southern hemispheres influences the location of the ITCZ and the intensity of the monsoon systems. From the late 1960s — early 1970s, the interhemispheric SST contrast experienced a rapid north–south shift, which had pronounced impacts on rainfall in the Sahel and other regions. I will discuss results from a detection & attribution study using CMIP5 models to quantify the contributions of external forcing and unforced internal variability to the interhemispheric SST contrast during the instrumental period (1881–2012). The late 1960s – early 1970s shift is found to be largely due to internal variability, with a smaller contribution from anthropogenic aerosols. Some models are able to produce such large-magnitude shifts in their control simulations, suggesting that the late 1960s – early 1970s shift is within the range of background climate variability. I will also discuss some of the patterns producing large-magnitude interhemispheric SST shifts.

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