From bballard at ucar.edu  Tue Feb 26 13:27:57 2008
From: bballard at ucar.edu (Barbara Ballard)
Date: Tue, 26 Feb 2008 13:27:57 -0700
Subject: [Seminar] CGD Seminar Reminder
Message-ID: <47C4764D.7040101@ucar.edu>

Jasper Kok will present his seminar, "Towards a physical understanding 
of the emission of mineral dust aerosols" today at 3:30 pm at the NCAR 
Mesa Lab Main Seminar Room.

-- 
Barbara Ballard
Administrative Assistant III
CCSM Program Office
Oceanography Section
National Center for Atmospheric Research
P.O. Box 3000
Boulder, CO  80307-3000
Phone: (303) 497-1358
Fax:   (303) 497-1700



From lbutler at ucar.edu  Thu Feb 28 16:40:38 2008
From: lbutler at ucar.edu (Lisa Butler)
Date: Thu, 28 Feb 2008 16:40:38 -0700
Subject: [Seminar] CGD Climate Analysis Section Brown Bag Seminar
Message-ID: <47C74676.9020503@ucar.edu>

At noon on Thursday, 13 March 2008, Rym Msadek of the Universit? Pierre 
et Marie Curie in Paris, France, will present a CAS Brown Bag Seminar on 
the "Multidecadal variability of the Atlantic MOC and its influence on 
the atmosphere."

The seminar will be held in the NCAR Mesa Lab Directors' Conference room 
(room 239).

The abstract of Ms. Msadek talk follows below.

The extent to which climate is influenced by low-frequency changes in 
the Atlantic Meridional Overturning Circulation (MOC) is investigated in 
a 500 year control simulation by the IPSL-CM4 coupled model. The 
multidecadal fluctuations of the MOC are mostly sensitive to the deep 
convection in the subpolar gyre, which occurs South of Iceland in the 
model, and are primarily forced by salinity advection due to the East 
Atlantic Pattern. The North Atlantic Oscillation plays a secondary role 
in the model. During summer, the MOC variability is shown to have a 
significant impact on the atmosphere in the North Atlantic-European 
sector. This influence is due to an interhemispheric Sea Surface 
Temperature anomaly pattern with opposite signs in the two hemispheres 
but largest amplitude in the northern one. This mode corresponds to the 
model Atlantic Multidecadal Oscillation and bears some similarity with 
the observed one. The atmospheric response is such that it induces a 
weak positive feedback on the MOC.

See also the web page at 
http://www.essl.ucar.edu/events/upload/abstract100407.pdf

-- 
Lisa Butler
Administrative Assistant
Climate Analysis Section
Climate and Global Dynamics Division
National Center for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307, USA

Tel: 303-497-1366
Fax: 303-497-1333
Email: lbutler at ucar.edu
Web: http://www.cgd.ucar.edu/cas/Staff/lisa/

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