Program and Agenda

Abstract

CHANGES TO THE ATMOSPHERIC GENERAL CIRCULATION WITH GLOBAL WARMING

The atmospheric general circulation is studied from a purely thermodynamic perspective by defining a stream function in latent heat (LH) versus dry static energy (DSE) coordinates. The stream function is named the hydrothermal stream function. It includes global mass fluxes across surfaces of LH and DSE irrespectively of spatial direction. The hydrothermal stream function combines the Walker and Hadley circulations as well as midlatitude eddies into a single cycle in LH-DSE space. We use the hydrothermal stream function as a diagnostic of the atmospheric general circulation to understand differences between climate models in the CMIP5 archive. We examine present-day (1980-2000) climate-model simulations and compare to simulations of the late 21st century (RCP8.5, 2080-2100). We find differences in the size and amplitude of the hydrothermal stream function between models as well as a widening (in LH--DSE space) and weakening of the hydrothermal stream function at the end of the 21st century. The widening is related to increases in near-surface DSE and LH. The weakening can be explained via thermodynamic arguments.

ePoster: http://www.eposters.net/pdfs/changes-in-atmospheric-circulation-with-global-warming.pdf

Authors

Kjellsson, J., Bolin Centre for Climate Research, Stockholm University, Sweden, joakim@misu.su.se

Döös, K., Bolin Centre for Climate Research, Stockholm University, Sweden, doos@misu.su.se

Zika, J. D., University of Southampton, National Oceanography Centre, United Kingdom, J.D.Zika@soton.ac.uk

Laliberté, F. B., University of Toronto, Canada, laliberte.frederic@gmail.com

Ballarotta, M., Bolin Centre for Climate Research, Stockholm University, Sweden, maxime.ballarotta@natgeo.su.se

Details

Poster presentation

Session #:159
Date: 2/26/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 2451