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第 197 回 大気海洋物理学・気候力学セミナー のおしらせ

日　時： 9月 24日(木) 午前 09:30
場　所： 低温科学研究所 3階 講堂 Auditorium, Institute of Low

発表者：Jost Heintzenberg
(Professor at Leibniz-Institute for Tropospheric Research, Germany; Visiting Professor at Institute of Low Temperature Science)
題　目：Aerosols, Clouds and Climate Change

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(Jost Heintzenberg) 発表要旨 :

  
Atmospheric aerosols with their multifaceted life cycle and
interaction with many processes in the Earth system pose the larges
uncertainties in any estimates of climate processes.  The intricately
connected multiphase aerosol and cloud systems cover the widest range
of process scales from the molecular level to the hemispheric scale.
Consequently, they demand the most complex characterization of all
atmospheric trace substances.  Aerosol process understanding requires
competence from a wide range of disciplines in Earth system sciences
comprising geology, biology, atmospheric chemistry and physics.

Stimulated by the first global chemistry/transport models and ensuing
first model estimates of aerosol forcing of climate and the subsequent
series of IPCC reports atmospheric aerosol and cloud research has made
great advances over the past 20 years.  The physical characterization
of atmospheric aerosol particles leaves few details to be asked for.
Despite major analytical advances the chemical characterization of
aerosols, however, still lags behind in terms of completeness and
temporal resolution.  Major gaps remain in aerosol and cloud related
physical and chemical process understanding.  These gaps comprise
particle nucleation and growth from the gas phase and chemical
transformations in concentrated solutions and on particle surfaces.
Only a few years ago the first dedicated global aerosol and cloud
related satellites with active sensing technology were launched.
Whereas their 4-dimensional global coverage promises a largely
enhanced aerosol database they will not be able to quantify the extent
of anthropogenic influence on atmospheric aerosols and clouds and
their climate processes, which will require chemical in situ
information that is not fully attainable to date.

The presentation will review the state of our knowledge of the
atmospheric aerosol and related cloud issues and will identify major
gaps of our understanding concluding with a personal outlook
concerning atmospheric aerosols and clouds towards the end of the 21st
century.

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