SHIVA - Stratospheric Ozone: Halogen Impacts in a Varying Atmosphere


Alfred-Wegner-Institute for Polar and Marine Research, Potsdam and Bremerhaven, Germany (AWI)


The contribution from partner AWI is from two independent groups, one led by Dr. Markus Rex focusing on atmospheric modelling, and one led by Dr. Astrid Bracher with a focus on remote sensing measurements of marine phytoplankton.

Dr. Markus Rex is a leading scientist for stratospheric ozone research and specifically trajectory modelling and lagrangian chemical modelling in the atmosphere. He has published nearly 50 peer reviewed papers on these topics and received various awards, including the Dobson award of the International Ozone Committee for his studies on the interaction between polar ozone loss and climate changes. He is coordinating lead author of WMO/UNEP’s „Scientific Assessment of Ozone Depletion: 2006“ and he was author or contributor of all WMO/UNEP ozone assessments since 1994. He is member of the steering committee of the SPARC initiative „process oriented validation of chemistry climate models“ (CCMval). SPARC (Stratospheric Processes and their Role in Climate) is a project of the World Climate Research Program (WCRP). He has been Principal Investigator in various international research projects funded by the EC and national projects funded by BMBF. Currently he is Principal Investigator, Leader of the Activity „Extratropical Ozone“ and member of the Executive committee of the integrated European research project SCOUT-O3 (Stratosphere-Climate Links with emphasize on the upper troposphere and lower stratosphere), a project with 15 MEuro support from the European Commission and over 60 partners.

Dr. Astrid Bracher is leading since 2007 the Helmholtz University Young Investigator’s Group “Phytooptics” at the Climate Section of AWI. The group works in strong cooperation with the Institute of Environmental Physics (IUP) at the University of Bremen where she shortly will be assigned as professor. Her recent studies focus on retrieving new biooptical information from the European satellite SCIAMACHY in addition to using the data of the common ocean color sensors MERIS, SeaWiFS and MODIS in order to improve estimates of marine phytoplankton distribution and productivity. Recently the retrieval of major marine phytoplankton groups (diatoms and cyanobacteria) was demonstrated (Bracher et al., 2007). Besides remote sensing her group also measures biooptical in-situ parameters and uses modelling to calculate radiative transfer and primary production. Formerly Dr. Bracher worked 6 years at IUP on ENVISAT satellite validation of atmospheric trace gas products as Co-PI and project coordinator (BMBF-projects SCIAVAL, VIRTIS, SATVAL, ESA-study SCILOV) and contributed to EU-projects AMIL2DA and TOPOZ, as well as on the determination of phytoplankton absorption from space-borne sensor SCIAMACHY as PI in the German Research Foundation funded project “PASAT”.

Tasks within SHIVA:

  • Coordination of work package 4
  • AWI-Potsdam will implement a package for tropospheric chemistry of VSLS into its lagrangian chemistry/transport model ATLAS. A parametrization for sub-scale convection will be developed and implemented.
  • AWI-Potsdam will then use ATLAS to model the transport and chemical transformation of VSLS from the boundary layer through the TTL into the stratosphere. The fully lagrangian calculations will be based on ECMWF fields and CCM model data.
  • AWI-Bremerhaven's group PHYTOOPTICS will ensure the production of tropical phytoplankton maps (classified by phytoplankton functional types) and contribute to the development of improved projections and scenarios for global emissions of VSLS as a function of climate change parameters as input for WP-5 and WP-6.
  • AWI-Bremerhaven will also analyse phytoplankton in-situ measurements to improve the retrieval of the distribution of major phytoplankton groups from remote sensing measurements at the time and sites where the different ship campaigns take place (WP-2).

Involved scientists:

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