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SUMMARY:Interactive effects of solar UV radiation and climate change on th
 e biogeochemical carbon cycling
DTSTART:20150512T161500
DTEND:20150512T171500
DTSTAMP:20260930T201210Z
UID:3952d075d319829029249779fa5f9e4f20852d4eed40ee0339cb9d92
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Barbara Sulzberger\, Honorary scientist\, EAWAG\, Member of
  United Nations Environment Programme (UNEP) Environmental Effects Assessm
 ent Panel (EEAP).\nAbstract:\nIn my seminar I will present some aspects of
  the 2014 Assessment Report of the United Nations Environment Programme (U
 NEP) Environmental Effects Assessment Panel (EEAP). This panel was establi
 shed by UNEP in 1988 after the Montreal Protocol on Substances that Deplet
 e the Ozone Layer had been signed in 1987. The 2014 Assessment Report incl
 udes 7 chapters on the environmental effects of ozone depletion and its in
 teractions with climate change. I am a co-author on Chapter 5 entitled “
 Effects of stratospheric ozone depletion\, solar UV radiation\, and climat
 e change on biogeochemical cycling: interactions and feedbacks”.\nIntera
 ctions between solar UV radiation and climate change are particularly pron
 ounced for carbon cycling\, resulting in UV-mediated feedbacks on climate.
  Possible positive feedbacks discussed in this seminar include: (i) reduce
 d efficiency of the biological pump due to UV-induced bleaching of colored
  dissolved organic matter (CDOM) in stratified aquatic ecosystems\, where 
 CDOM protects phytoplankton from the damaging solar UV-B radiation\; (ii) 
 enhanced UV-induced mineralization of photo-reactive dissolved organic mat
 ter (DOM) in aquatic ecosystems due to changes in continental runoff and i
 ce melting. The biological pump (CO2 binding in photosynthesis by phytopla
 nkton and export of dead particulate organic matter to the sediment) is th
 e main biological process for CO2 removal by aquatic ecosystems\, whereas 
 mineralization of organic matter results in the production and release of 
 CO2.\nTerrestrial and aquatic ecosystems are currently net CO2 sinks on a 
 global average\, where the CO2 uptake corresponds to ca. 30% and 25% of an
 thropogenic CO2 emission\, respectively. However\, the interactive effects
  of solar UV radiation and climate change on carbon cycling could alter th
 e delicate balance of the global carbon sinks.Short biography:\nBarbara Su
 lzberger received her diploma in chemistry and her Ph.D. from the Universi
 ty of Bern. Both her Ph.D. and subsequent post-doctoral research at The Ro
 yal Institution of Great Britain were related to photochemical solar energ
 y conversion. After an appointment at Ciba-Geigy AG\, she joined the Swiss
  Federal Institute of Aquatic Science and Technology (Eawag) in 1986\, the
 n under the direction of Werner Stumm. At Eawag\, Barbara Sulzberger heade
 d a group conducing aquatic photochemical research until her retirement in
  2007. In 1994 and 1995\, she was a guest scientist at the Woods Hole Ocea
 nographic Institution. Her research group at Eawag investigated (i) the ef
 fects of solar radiation on the biogeochemical cycling of carbon and of tr
 ace metals (iron\, copper\, manganese) in aquatic systems\, (ii) the effec
 ts of solar radiation on the chemical composition and bioavailability of d
 issolved organic matter (DOM)\, and (iii) the roles of iron in light-induc
 ed transformations of organic and inorganic pollutants (atrazine\, diuron\
 , EDTA\, chromate). She is the co-author or author of over 50 peer-reviewe
 d articles published in international\, high-impact journals and of 12 boo
 k chapters.  \nBarbara Sulzberger was a lecturer at ETH Zurich and at th
 e University of Bern. From 2002-2007\, she was the editor-in-chief of the 
 journal Aquatic Sciences – Research Across Boundaries. Since 2003 she is
  a member of the United Nations Environment Programme (UNEP) Environmental
  Effects Assessment Panel (EEAP).
LOCATION:GR A3 31 http://plan.epfl.ch/?room=GR%20A3%2031
STATUS:CONFIRMED
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