1. Measurements of gas exchange at Siikaneva boreal fen J. Rinne 1, T. Riutta 2, M. Aurela 3, M. Pihlatie 1, S. Haapanala 1, H. Hellén 4, J.-P. Tuovinen 3, E. Kellner 5, H. Hakola 4, E.-S. Tuittila 2, T. Laurila 3, J. Laine 5 & T. Vesala 1 1)Department of Physical Sciences, University of Helsinki, Finland 2)Department of Forest Ecology, University of Helsinki, Finland 3)Climate and Global Change Research, Finnish Meteorological Institute, Helsinki, Finland 4)Air Chemistry Laboratory, Finnish Meteorological Institute, Helsinki, Finland 5)Finnish Forest Research Institute, Joensuu, Finland 6)Finnish Forest Research Institute, Parkano, Finland Janne Rinne University of Helsinki, Finland 20-30% of the total terrestial carbon storage is in northern peatlands Continuous measurements in natural wetland are rare With help from Mika Aurela, Terhi Riutta, Sami Haapanala, Heidi Hellén, Mari Pihlatie Three wetland main sites in the CarboEurope

2. Kilometers Lake Agriculture Coniferous forest Broad-leafed forest Mixed forest Seedlings Sounding site Population centers and industial areas Wetlands and peat harvesting areas Open areas, clearcuts, roads Hyytiälä Siikaneva fen

3. SIIKANEVA Boreal fen located 5 km from Hyytiälä Largest remaining natural fen in Southern Finland Peat depth up to 4 meters at the measurement site Accumulated since the last ice age Siikaneva is a minerotrophic fen Vegetation dominated by Spaghnum mosses and sedges

4. Yearly average 3.3  C Yearly total 713 mm 2005

5. MEASUREMENTS Eddy covariance measurements of CO 2, H 2 O and CH 4 fluxes Relaxed eddy accumulation measurements of VOC fluxes Chamber measurements of the exchange of CO 2, CH 4 and VOCs Weather and soil parameters Gas concentrations in soil water Peat properties from drilled samples Vertical peat movement DOC and DIC analyzes planned in near future

6. Department of Physical Sciences J. Rinne, M. Pihlatie, S. Haapanala, T. Vesala Department of Forest Ecology T. Riutta, S. Juutinen, E.-S. Tuittila, J. Pumpanen, P. Hari Climate and Global Change Research M. Aurela, J.-P. Tuovinen, T. Laurila Air Chemistry Laboratory H. Hellén, H. Hakola Joensuu office E. Kellner Parkano office J. Laine Department of Biological and Environmental Sciences K. Yrjälä, H. Juottonen University of Helsinki, Finland Finnish Meteorological Institute, Helsinki Finnish Forest Research Institute

7. Carbon dioxide exchange Yearly CO 2 balance about -150 g m -2 (-40 g C m -2 ) (June 2004 - May 2005)

8. Methane emissions measured by EC method, 2005 Yearly emission about 10 g C m -2 GWP 100 300 CO 2 -eq. g m -2

9. Methane emissions by chamber measurements

10. VOC emissions REA technique Chamber technique

11. Main emitted species: isoprene (C 5 H 8 ) Yearly emission about 0.1 g C m -2 Important for the boundary layer air chemistry and possibly for aerosol formation

12. Gas concentrations in soil water Peat movement Peat properties

13. Summary Carbon balance view: Siikaneva is a sink of carbon, methane significant Greenhouse gas balance view: Siikaneva is a source of greenhouse gases, methane important In addition Siikaneva is a source of reactive VOCs However, the numbers are preliminary

14. Infrastructure Siikaneva has 220 V AC line power Road 20 meters from the edge of the fen Wooden walk-ways supported by poles driven to the mineral soil Hyytiälä forestry station provides accomodation, nutrition and other services Distance to Helsinki 230 km, to Tampere 70 km, and to Orivesi 20 km More info from Janne Rinne (janne.rinne@helsinki.fi) or Eeva-Stiina Tuittila (eevastiina.tuittila@helsinki.fi)

15. Thank you for your attention......and see you there!