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Séminaires

by Webmaster Legos last modified Feb 07, 2012 11:59 AM

Mardi 8 Octobre - The influence of eastern tropical Pacific air-sea interaction and turbulent mixing on global ocean heat transport

by SEMSOU last modified Aug 23, 2019 07:23 PM
When Oct 08, 2019
from 11:00 AM to 12:00 PM
Where Lyot
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Ryan Holmes

University of New South Wales (UNSW), Sydney

 

Title: The influence of eastern tropical Pacific air-sea interaction and turbulent mixing on global ocean heat transport

 

Abstract: The ocean transports vast amounts of heat around the planet, helping to regulate regional climate. In this talk I will discuss a framework that relates the ocean's meridional heat transport to the diabatic processes of air-sea heat fluxes and mixing that move heat across temperature classes. Applied to a global ocean model the framework emphasizes the role of upwelling in the eastern tropical Pacific, and the exchange of heat between the Indo-Pacific and Atlantic basins. Turbulent mixing (both explicitly parameterized and numerical mixing) plays a key role by moving heat from the warm, shallow Indo-Pacific circulation to the deeper-reaching Atlantic circulation and to the cold isotherms that outcrop in the North Atlantic. The role of the eastern Pacific cold tongue emphasises the need to better understand the complexity of processes that influence vertical heat exchange there. I will also discuss interactions between tropical instability waves, atmospheric variability and shear-driven turbulent mixing that impact the large-scale circulation in the cold tongue region and its interannual variability.

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Vendredi 4 Octobre - Impacts of projected climate change on the cryosphere and implications for sea level rise

by SEMSOU last modified Sep 20, 2019 07:02 PM
When Oct 04, 2019
from 11:00 AM to 12:00 PM
Where salle Coriolis
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Jonathan Bamber

Bristol University, UK


Title : Impacts of projected climate change on the cryosphere and implications for sea level rise

 

Abstract: The polar regions are predicted to warm at a rate of around twice the global mean. The Arctic has warmed by around 2 degrees in the last 25 years and some of the most dramatic signals of climate warming are found there. I will give a brief overview of recent observations of sea ice, permafrost and glacier trends in the polar regions before focusing on observations of ice sheet change of a range of time scales from glacial-cycles to the satellite record covering the last ~28 years and then look at the challenges of projecting their future trends and the implications for global and regional sea level.

 

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Lundi 16 Septembre - On ENSO Theory

by SEMSOU last modified Aug 23, 2019 07:24 PM
When Sep 16, 2019
from 11:00 AM to 12:00 PM
Where salle Coriolis
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Fei-Fei Jin

 

Department of Atmospheric Science, SOEST

University of Hawaii


Title: On ENSO Theory

 

Abstract: Great progresses have been made in understanding, modeling, and predicting the basic features of the El Nino-southern Oscillation (ENSO) phenomenon characterized by interannual warming/cooling of the central to eastern equatorial Pacific and weakening/strengthening of tropical Pacific trade winds. The intensities, durations, patterns of sea surface temperature anomalies vary substantially from event to event. These differences often have significant global consequences.  Climate models still exhibit large spread in simulating ENSO’s time-space complexities.  Better simulations and predictions ENSO require deeper understandings of the dynamics not only for ENSO’s basic features but also for its complexity.  This talk will briefly review progresses in terms of ENSO theory on ENSO’s amplitude, phase-locking, asymmetry, pattern diversity, and multi-scale nonlinear interactions.

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