[Eoas-seminar] Upcoming MET Seminars: Thurs Jan 23 & Tues Jan 28

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Tue Jan 21 15:55:21 EST 2020

Dear all,

In addition to the Meteorology Seminar this Thursday (Jan 23; 3:30 PM 353 LOV) given by Dr. Levi Silvers, and the EOAS Colloquium this Friday (Jan 24; 3:30 PM 1044 EOA) given by Prof. Kevin Reed, we also have a special Meteorology Seminar next Tuesday (Jan 28; 3:30 PM 353 LOV) given by Dr. Tobias Becker of the Max Planck Institute for Meteorology.

Dr. Becker will speak about the processes that control climate sensitivity in idealized simulations, including convective organization (title & abstract below, flyer attached). Dr. Becker is interested in the interaction of precipitating convection with the large-scale environment, convective organization, entrainment, and modeling (https://www.mpimet.mpg.de/en/staff/tobias-becker/research-interests/). Please contact Allison Wing (awing at fsu.edu<mailto:awing at fsu.edu>) if you would like to meet with Dr. Becker (he is visiting Jan 22-29).

There are also a couple spots remaining to meet with Dr. Silvers and Prof. Reed. Each will be on campus Jan 22-24.



Upcoming Seminars

Meteorology Seminar by Dr. Levi Silvers (Thursday Jan 23, 3:30 PM 353 LOV)
Title: A mock-Walker Circulation and Radiative Convecitve Equilibrium: Clouds and Precipitation

EOAS Colloquium by Prof. Kevin Reed (Friday Jan 24, 3:30 PM 1044 EOA)
Title: Exploring Climate Change Impacts on Tropical Cyclones

Meteorology Seminar by Dr. Tobias Becker (Tuesday Jan 28, 3:30 PM 353 LOV)
Title: Climate sensitivity across the RCEMIP simulations

Abstract: Simulations of radiative-convective equilibrium (RCE) have greatly influenced the understanding of climate, and climate change. Early simulations were performed with very simple one-dimensional models of the atmosphere, followed by cloud-resolving simulations. In the last five years it has also become common practice to simulate RCE with comprehensive general circulation models. These recent studies have revealed that different RCE states can be found, depending on how convection aggregates, even in the absence of external asymmetries in the forcing, and have motivated the RCEMIP project, which defines a standardized experimental protocol, to study RCE across a range of models. For each RCEMIP model, simulations at fixed sea-surface temperatures of 295 K, 300 K and 305 K have been performed, both on a small and on a large domain.

Here our focus is on investigating how climate sensitivity differs across those simulations, with the aim to understand what processes control climate sensitivity. The results show that as long as simulations are run on a small domain, differences in climate sensitivity among the different models are still relatively small, while climate sensitivities vary tremendously for the large domain simulations. The climate sensitivity parameter ranges from very low to high or even negative values, the latter indicating an unstable climate state. The variability of climate sensitivity is larger on the large domain than on the small domain because convective self-aggregation is suppressed on the small domain, while self-aggregation is free to change with temperature on the large domain, thereby affecting climate sensitivity: if self-aggregation increases with temperature, then climate sensitivity is small, and if self-aggregation decreases with temperature, then climate sensitivity is high or even negative. We can attribute this effect to a drying and expansion of the subsiding regions in response to convective self-aggregation, causing an increase in outgoing longwave radiation. In addition, changes in low clouds play a critical role.

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