[Grad-postdoc-assn] Fwd: [Postdocs] ASP seminar today

[Scott Briggs]

FYI


-------- Original Message --------
Subject: [Postdocs] ASP seminar today
Date: Tue, 26 Mar 2013 13:49:21 -0600
From: Toby Ault <ault at ucar.edu>
To: Postdocs at mailman.ucar.edu

Hello,

Just a reminder that we have an ASP seminar (Judith Perlwitz) today
being hosted jointly with CGD (ML, Main Seminar Room, 3:30). Please join
us afterwards as well at Southern Sun to chat with the speaker.

Title and abstract below.

Best,
Toby


Is blocked atmospheric flow a prerequisite for extreme European heat
waves in summer?

Atmospheric blocking is a large-scale mid-latitude circulation
phenomenon characterized by a persistent anticyclone that interrupts the
typically westerly flow.    Atmospheric blocking can cause extreme near
surface temperature conditions either by the advection of anomalously
cold or warm air in the outer region of the block or by anomalies in the
surface radiative budget in the center of the block.  Summertime
blocking conditions were closely linked to the 2003 European heat wave
centered in France and the 2010 Western Russia heat wave.

This talk will address the linkage between blocked flow and warm spells
over Europe by utilizing a suite of CCSM4 simulations.  Summertime
blocking over Europe and related climate conditions are realistically
represented in this climate model.  The analysis of observations and a
multi-century Year 2000 simulation suggests that summertime warm spells
in Scandinavia and Western Russia are closely controlled by blocking
while mid-latitude temperature extremes in Western Europe are less
sensitive to this circulation phenomenon. This talk closes with a
discussion on the potential role of climate change on the linkage
between blocking and temperature extremes.


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-- 
Scott Briggs
Administrative Assistant
Advanced Study Program
National Center for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307-3000
303-497-1607