1. Net Ecosystem Exchange Response to Ozone Exceedance Levels at Sallie’s Fen, Barrington NH Summer 2007 R & D Jordan P Goodrich Advisor: Dr. Ruth K. Varner Summer 2007 R & D Jordan P Goodrich Advisor: Dr. Ruth K. Varner

2. Ozone Background  Tropospheric ozone (O 3 ) has increased by more than a factor of two since pre- industrial times [Levy II et al., 1997]  Highest O 3 mixing ratios occur during mid-day in summer months [Talbot et al., 2005]  Global average surface O 3 mixing ratios projected to increase through 2030 using Goddard Institute for Space Studies composition-climate model [Unger et al., 2006]  Tropospheric ozone (O 3 ) has increased by more than a factor of two since pre- industrial times [Levy II et al., 1997]  Highest O 3 mixing ratios occur during mid-day in summer months [Talbot et al., 2005]  Global average surface O 3 mixing ratios projected to increase through 2030 using Goddard Institute for Space Studies composition-climate model [Unger et al., 2006]

3. Figure 1. Summer 2007 Ozone mixing ratios at Thompson Farm, Durham,NH (1 min. running Average)

4. Wetland Background  Particularly vulnerable when exposed to high [O 3 ] due to high growth rates, stomatal conductance and specific leaf area [Power & Ashmore, 2002]  Damage to cellular structure most severe during summer at >100 ppbv O 3 exposure [Rinnan & Holopainen, 2004]  Majority of studies examine response of individual species under controlled conditions [Anderson & Grulke, 2001]  Particularly vulnerable when exposed to high [O 3 ] due to high growth rates, stomatal conductance and specific leaf area [Power & Ashmore, 2002]  Damage to cellular structure most severe during summer at >100 ppbv O 3 exposure [Rinnan & Holopainen, 2004]  Majority of studies examine response of individual species under controlled conditions [Anderson & Grulke, 2001]

5. Methods  Atmospheric Ozone data from Thompson Farm, Durham, NH AIRMAP station  NEE data from autochamber measurements at Sallie’s fen  Correlations attempted for April-October 2001-2005  Atmospheric Ozone data from Thompson Farm, Durham, NH AIRMAP station  NEE data from autochamber measurements at Sallie’s fen  Correlations attempted for April-October 2001-2005

6. AutoChamber-Ozone Correlations Figure 2. Thompson Farm Ozone and Sallie’s Fen AutoChamber Carbon flux in August 2002 Uptake Emission

7. AutoChamber-Ozone Correlations Figure 3. PAR curve for NEE in chamber 7 at Sallie’s Fen, Barrington, NH

8. AutoChamber-Ozone Correlations Figure 4. Mean ozone with mean residuals from PAR fit

9. Methods  Leaf level: Li-6400 Portable photosynthesis system  20 CO 2 points per leaf, flux measured with matched IRGA system  Other environmental conditions are set… temp.,flow, RH, PAR  ~6 leaves per plant  Leaf level: Li-6400 Portable photosynthesis system  20 CO 2 points per leaf, flux measured with matched IRGA system  Other environmental conditions are set… temp.,flow, RH, PAR  ~6 leaves per plant

10. Methods  Species chosen based on functional groups: Carex rostrata (graminoids), Alnus incana (deciduous shrub), Camaedaphne calyculata (evergreen shrub)  Each species requires one full day of measurements: time constraints allowed only 4 days per species (2-3 weeks of training and light curves)  Species chosen based on functional groups: Carex rostrata (graminoids), Alnus incana (deciduous shrub), Camaedaphne calyculata (evergreen shrub)  Each species requires one full day of measurements: time constraints allowed only 4 days per species (2-3 weeks of training and light curves)

11. [Bubier et al., 2003, Thornley & Johnson, 1990 ] Figure 5. Best fit curve for Data output (Carex rostrata CO 2 run)

12. Results Figure 6. Simple regression: Ozone vs Photosynthesis (Carex rostrata)

13. Conclusions & Future Considerations  Significant correlations between [Ozone] and NEE for September  Strongest relationship between leaf level flux and [Ozone] occurs with Carex rostrata…*Link to Methane emissions  Limitations include time constraints of a 10 week project, prediction of ozone exceedance events, accuracy of the instrument measurements  Significant correlations between [Ozone] and NEE for September  Strongest relationship between leaf level flux and [Ozone] occurs with Carex rostrata…*Link to Methane emissions  Limitations include time constraints of a 10 week project, prediction of ozone exceedance events, accuracy of the instrument measurements

14. NASA Relevance Earth Observing System (EOS): AURA Project

15. Acknowledgements  Dr. Ruth K Varner, Dr. Jill Bubier, Steve Philips  Dr. George Hurtt  UNH & NASA  Dr. Ruth K Varner, Dr. Jill Bubier, Steve Philips  Dr. George Hurtt  UNH & NASA