1. Testbed in Division of Atmospheric Sciences point of view Markku Kulmala University of Helsinki Department of Physical Sciences

2. Division of Atmospheric Sciences ca. 70 scientists 7 professors aerosol and environmental physics micrometeorology and chemical meteorology dynamic and physical meteorology –e.g. mesometeorology radar meteorology

3. iLEAPS/ IGBP Finnish Academy of Finland Nordic BACCI, Aerosols Nordic, NECC,Fluxes NordForsk Graduate School CBACCI APFE ENoE ACCENT Centers of Excellency EUCAARI, EUSAAR CARBOEUROPE, NITROEUROPE

4. Approaches: how to answer our research questions experimental –laboratory –field (continuous and campaigns) –development of novel instrumental techniques theoretical –basic theories –simulations –model development From molecular to global scale Physics, Chemistry, Biology, Meteorology –Inter- and multidisciplinary approaches Global networking and partnership

5. Research Chain Molecular properties Nucleation Aerosol Dynamics Boundary Layer Dynamics Regional Scale Global Scale –COSMOS consortium

6. EUCAARI measurement network

7. Continuous Measurements

8. Cluster Ions Aerosol particles Cloud Condensation Nuclei Observation of Nucleation Burst in Finland Kulmala et al., 2004, ACP

9. New CoE: Ambition

10. Future ideas MesoMet as part of Centre of Excellence (European Centre of Atmospheric Reserach) Needs to use Testbed for trace gas and aerosol research –Pollution episodes –Atmospheric chemistry –Aerosol dynamics

11. Visions 2025 More environmental related measurements with continuous datasets –CO 2 from 1958 (Mauna Loa) –Aerosol size distributions from 1996 (Hyytiälä) Models with more exact chemistry and aerosol dynamics –pollution, health effects –climate change However, a lot to study still left –comparison met. studies started around 150-200 years ago –environmental studies ca 20-50 years ago