scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
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STP12 Abstracts<br />
Berlin, 12 - 16 July <strong>2010</strong><br />
SCOSTEP Symposium <strong>2010</strong><br />
Stratospheric Ozone Ch<strong>an</strong>ges <strong>an</strong>d their Influence on Weather <strong>an</strong>d Climate<br />
L<strong>an</strong>gematz Ulrike<br />
<strong>Institut</strong> <strong>für</strong> Meteorologie, Freie Universität Berlin<br />
Ozone is <strong>an</strong> import<strong>an</strong>t trace gas in Earth’s atmosphere. 90% of the ozone is found in the<br />
stratosphere; highest ozone mixing ratios are measured at ~35 km, while most of the ozone<br />
mass is found in the lower to middle stratosphere at ~25 km altitude. Stratospheric ozone<br />
protects life on Earth as it absorbs harmful ultraviolet radiation from the sun.<br />
Since the mid 1980s, when Antarctic measurements showed unexpected, strong, recurring<br />
ozone losses in spring, stratospheric ozone concentrations have been continuously decreasing<br />
due to chemical destruction as a result of <strong>an</strong>thropogenic emission of chlorofluorocarbons<br />
(CFCs) <strong>an</strong>d other ozone depleting subst<strong>an</strong>ces (ODSs). To avoid further damage to the ozone<br />
layer, the Montreal Protocol <strong>an</strong>d several adjustments to control the production <strong>an</strong>d<br />
consumption of ODSs were implemented, with the effect of a measurable reduction of CFCs<br />
in the lower atmosphere <strong>an</strong>d a stop of the increase of CFCs in the stratosphere by now. Recent<br />
measurements indicate a slowing of the global ozone decrease. New model predictions of the<br />
future evolution of the ozone layer indicate a recovery of stratospheric ozone in most regions<br />
during the 21 st century, however with large local differences in the speed of recovery.<br />
In this talk <strong>an</strong> overview of past stratospheric ozone ch<strong>an</strong>ges, their impact on the thermal <strong>an</strong>d<br />
dynamical structure of the stratosphere, <strong>an</strong>d their possible influence on climate <strong>an</strong>d weather<br />
will be given. Future projections of stratospheric ozone ch<strong>an</strong>ge from chemistry-climate<br />
models will be presented, <strong>an</strong>d the interaction between ozone recovery <strong>an</strong>d climate ch<strong>an</strong>ge will<br />
be discussed.
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