Institute for Atmospheric and Climate Science

Workshop "Variability of the Global Atmospheric Circulation During the Past 100 Years", Monte Verità, June 15-20 2008

Latest News:

A report of the meeting and the final programme are now available:


Meeting Overview:

As a follow-up to the workshop held in Gwatt, Switzerland in July 2006 on "Climate Variability and Extremes During the Past 100 Years", we are organizing an upcoming workshop on "Variability of the Global Atmospheric Circulation During the Past 100 Years", to be held 15-20 June 2008 at Monte Verita, Switzerland The aim of this meeting is to improve our current understanding of the large-scale atmospheric circulation, its variability, its interaction with the ocean and land surface as well as its response to specific forcings. More information on each session is given below.

The meeting will be held at the Centro Stefano Franscini, Monte Verita. This is a beautiful spot just above Ascona and Lake Maggiore in the southern part of Switzerland

Due to the limited space at the center, interested participants should reply before 31 December 2007. Please include a tentative title and session (see below) and indicate whether or not you would like to give an oral or poster presentation.

We look forward to seeing you once again!

Conference board: Stefan Broennimann, Juerg Luterbacher, Tracy Ewen, Urs Neu

The Sessions

Atmospheric circulation modes

The aim of this session is to put together the latest research in our
understanding of large-scale variability modes in the atmosphere, their
variability during the 20th century and their representation in current
climate models. Presentations are sought on the “classical” variability
modes such as North Atlantic or Arctic Oscillation or the Pacific-North
American pattern, but also on new concepts emphasising dynamical aspects.

Multidecadal modes in the climate system

In recent years, several multidecadal modes of the climate systems have
been proposed such as the Pacific Decadal Oscillation or the Atlantic
Multidecadal Oscillation, or the Arctic Low Frequency Oscillation.
Multidecadal modes are of particular interest as they might lead to
forecast skill on decadal scales. In this session, the latest research
on multidecadal modes in the climate systems will be presented.

The tropical circulation

The tropical Hadley and Walker cells as well as the monsoon systems are
arguably the most important drivers of the global atmospheric
circulation. In this session the variability of these circulation
systems over the past 100 years will be discussed, their mutual
interaction, their interaction with the extratropical circulation as
well as their response to specific forcings. Again, observations based
studies as well as model analyses will be presented.

ENSO teleconnections

ENSO is the globally dominant mode of interannual climate variability.
It affects climate not only in the tropical or Pacific North American
regions, but also in more remote regions. In recent years, substantial
progress has been made in the forecast of ENSO, which provokes the hope
to also improve seasonal forecast in the extratropics due to ENSO’s
teleconnections. However, the some of the teleconnections seem to be
non-linear and non-stationary. In this session, ENSO teleconnections
will be discussed in the light of atmospheric circulation.

Large-scale circulation and droughts

Several models suggest that severe droughts will increase in frequency
in a future climate. Understanding the large-scale circulation patterns
behind droughts is therefore of particular importance. The presentations
given in this section will address the relation between droughts in
different regions and the large-scale circulations. The relation between
droughts and the oceans will be discussed in data analysis and model
simulations. Finally, the potential predictability of severe droughts
will be addressed.

The polar circulation

This session deals with atmospheric circulation in the polar regions.
The Arctic is a very sensitive part of the climate system, which has
experienced large changes in the past and will experience even larger
changes in the future. During the past 100 years the Arctic experienced
two periods of pronounced warming which will be discussed in the light
of atmospheric circulation. Another topic concerns recent changes in the
circulation over Antarctica, including temperature trends in the free
troposphere as well as the effect of the ozone hole on the circulation.


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