CEIP annual meeting, Poznan, Poland, 8 -10 Oct 2007 ADVEX, the CarboEurope-IP advection campaigns: Overview paper, Norunda nights C. Feigenwinter 1,7 and.

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Presentation transcript:

CEIP annual meeting, Poznan, Poland, Oct 2007 ADVEX, the CarboEurope-IP advection campaigns: Overview paper, Norunda nights C. Feigenwinter 1,7 and the ADVEX teams 1,2,3,4,5,6 1 Gembloux Agricultural University, Physique des Bio-systèmes, Gembloux, Belgium (FUSAGx) 2 TU Dresden, Institute of Hydrology and Meteorology, Department of Meteorology, Dresden, Germany (TUD) 3 Max Planck Institute for Biogeochemistry, Jena, Germany (MPI-BGC) 4 University of Lund, Physical Geography and Ecosystems Analysis, Lund, Sweden (LUND) 5 Autonomous Province of Bolzano, Forest Service, Agency of Environment, Bolzano, Italy (APB) 6 Institute of System Biology and Ecology, Laboratory of Plants Ecological Physiology, Brno, Czech Republic (ILE) 7 University of Basel, Institute of Meteorology, Climatology and Remote Sensing, Basel, Switzerland (MCR)

CEIP annual meeting, Poznan, Poland, Oct 2007 Current state of the ADVEX overview paper uncorrected proof available doi: /j.agrformet corrected proof available online soon…

CEIP annual meeting, Poznan, Poland, Oct 2007 ADVEX overview paper summary: sites and setup

CEIP annual meeting, Poznan, Poland, Oct 2007 ADVEX overview paper summary: vertical advection

CEIP annual meeting, Poznan, Poland, Oct 2007 ADVEX overview paper summary: horizontal advection

CEIP annual meeting, Poznan, Poland, Oct 2007 ADVEX overview paper summary: advection and flow direction at night

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : high CO 2 concentrations up to canopy top

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : two independent measurements show same phenomenon (tower B)

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : comparison with Renon and Wetzstein 360…537 ppm 360…425 ppm Nights with large site specific vertical CO 2 gradients 360…395 ppm

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : high CO 2 concentrations (420 ppm) up to 100 m

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : unrealistic high values for horizontal advection

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : impacts on components of NEE EC-flux: Occasional high positive fluxes during the night (up to 10 mmol m-2 s-1) despite low u* values. Storage: large variability of the storage flux, but in the average the common picture for forests with CO2 accumulation during the night and sudden „flush out“ after sunrise Vertical advection: temporal differences in sign between towers probably related to incomplete tilt correction algorithms (planar fit). Temporarily large fluxes but nightly average is often close to zero. Horizontal advection: extremely large (unrealistic) fluxes caused by large horizontal gradients in crown space.

CEIP annual meeting, Poznan, Poland, Oct 2007 Hotspot Norunda : in canopy turbulence increases when top canopy turbulence is low

CEIP annual meeting, Poznan, Poland, Oct 2007 Thank you for your attention