From: Cox,Carolyn
Sent: Friday, April 08, 2011 11:16 AM
To: Staal,Lisette M
Subject: Florida Climate Institute: Special Guest Seminar with Benjamin Kirtman - Thursday, April 14


Can you please circulate?





FCI - Spring 2011 Special Guest Seminar:

Please join us for the Spring 2011 Seminar Series.  The seminars will consist of one presentation from leading climate researchers. The location of the live presentations will alternate between UF and FSU, and the presentations will be transmitted via video to the non-host institution.

Thursday, April 14, 2011 from 1:00 pm to 2:00 pm

Attend the live seminar at FSU-COAPS, R.M. Johnson Building, in room 220.

View the video broadcast at UF’s Frazier Rogers Hall, in room 122.



Speaker: Benjamin Kirtman. Professor, University of Miami - RSMAS.

Dr. Benjamin Kirtman has been a Professor at the University of Miami - Rosenstiel School for Marine and Atmospheric Science since 2007. From 1993-2002 Dr. Kirtman was a research scientist with the Center for Ocean-Land-Atmosphere Studies and in 2002 joined the faculty of George Mason University as an Associate Professor. Dr. Kirtman uses complex coupled ocean atmosphere general circulation models to investigate the predictability of the climate system on timescales from days-to-decades and to study the influence of tropical variability on mid-latitude predictability and to assess how the annual cycle affects intraseasonal and interannual predictability. Current areas of interest include: El Nino prediction, dynamics and low frequency variations; impact of atmospheric stochastic forcing on coupled climate variability; El Nino Monsoon interactions; and the maintenance of the inter-tropical convergence zone. Currently, Dr. Kirtman is co-Chair of the NOAA Climate Test Bed – Climate Science Team and co-Chair of the International Clivar Working Group on Seasonal to Interannual Prediction (WGSIP) and a Coordinating Lead Author for the IPCC AR5. Professor Kirtman is also an Executive Editor of Climate Dynamics. Professor Kirtman received is BS in Applied Mathematics from the University of California-San Diego in 1987, and his MS and Ph.D. in 1992 from the University of Maryland-College Park.

Title: "Impact of Ocean Model Resolution on CCSM Climate Simulations"

The current literature provides compelling evidence suggesting that an eddy-resolving (as opposed to eddy permitted) ocean component model will significantly impact the simulation of the large-scale climate, although this has not been fully tested to date in multi-decadal global coupled climate simulations. The purpose of this talk is to document how increased ocean model resolution impacts the simulation of the large-scale climate variability. The model used for this study is the NCAR Community Climate System Model version 3.5 (CCSM3.5) - the forerunner to CCSM4. Two experiments are reported here. The first experiment (i.e., control, referred to as LRC) is a 155-year present-day climate simulation of the 0.5 atmosphere (zonal resolution 0.625 meridional resolution 0.5) coupled to ocean and sea-ice components with zonal resolution of 1.2 and meridional resolution varying from 0.27 at the equator to 0.54 in the mid-latitudes. The second simulation is carried out in two phases with the same atmospheric model coupled to 0.1 ocean and sea-ice component models. The initial condition for the first phase (referred to as HRC03) is the same as the control simulation except that the ocean state has been interpolated to the 0.1 grid. The second phase (referred to as HRC06) begins at year-102 of HRC03 using the same resolution and parameters except in this case the polar winds have been filtered to reduce computational instability. This phase of the experiment extends to year-155. The simulations are compared in terms of how ocean eddies impact the mean and variable climate. Emphasis is placed on the tropical Pacific and the North Atlantic Ocean, and specifically how the resolved eddies impact air-sea feedbacks.


Carolyn Cox

Coordinator, Florida Climate Institute

University of Florida

PO Box 110570

Gainesville, FL 32611

Ph: 352.392.1864 x 233

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