
Klapstein, S.J., Risk, D. 2010. Relative Importance of Physical Constraints on Decomposition. The Journal of Young Investigators Vol. 21, Issue 2, pages 17-30, February 2011. Here.
Phillips, C.L., Nickerson, N., Risk, D., Bond, B. 2010. Interpreting diel hysteresis between soil respiration and temperature. Global Change Biology Volume 17, Issue 1, pages 515–527, January 2011. Here.
Phillips, C.L. Nickerson, N., Risk, D., Kayler, Z.E., Andersen, C., Mix, A., Bond, B. (2010) Soil moisture effects on the carbon isotope composition of soil respiration Rapid Communications in Mass Spectrometry 24: 1271-1280. Here.
Nickerson, N., and D. Risk. (2009) A numerical evaluation of chamber methodologies used in measuring the δ13C of soil respiration. Rapid Communications in Mass Spectrometry 23, 2802-2810. Here.
Risk, D., L. Kellman and M. Moroni. (2009) Characterization of variability and spatial patterns in tree and soil δ13C at research sites in eastern Canada. Isotopes in Environment and Health 45, 220-230. Here.
Nickerson, N., and D. Risk. (2009) Keeling plots are non-linear in non-steady state diffusive environments. Geophysical Research Letters, 36, L08401, doi:10.1029/2008GL036945. Here
Nickerson, N., and D. Risk. (2009) Physical Controls on the Isotopic Composition of Soil Respired and CO2. Journal of Geophysical Research-Biogeosciences, 114, G01016, doi:10.1029/2008JG000844. Here.
Risk, D., Kellman, L., H. Beltrami and A. Diochon. (2008) In-situ incubations by root exclusion highlight the climatic sensitivity of soil organic matter pools. Environmental Research Letters, 3, 044004. Here.
Risk, D., Kellman, L. (2008) Isotopic Fractionation in Non-Equilibrium Diffusive Environments. Geophysical Research Letters, 35, L02403, doi:10.1029/2007GL032374. Here.
Risk, D., Kellman, L., and H. Beltrami. (2008) A new method for in-situ soil gas diffusivity measurement and applications in the monitoring of subsurface and CO2 production. Journal of Geophysical Research - Biogeosciences - doi:10.1029/2007JG000501. Here.
Kellman, L. Beltrami, H. and D. Risk. (2007) Changes in seasonal soil respiration with pasture conversion to forest in Atlantic Canada. Biogeochemistry, 10.1007/s10533-006-9056-0. Here.
Risk, D., Kellman, L., and H. Beltrami (2002). Soil and CO2 production and surface flux at four climate observatories in eastern Canada, Global Biogeochemical Cycles, 16 (4), 1122, doi:10.1029/2001GB001831. Here.
Risk, D., Kellman, L. and H. Beltrami (2002). Carbon dioxide in soil profiles: Production and temperature dependency, Geophysical Research Letters, 29 (6), 10.1029/2001GL014002. Here.
Hart, C., Risk, D. Multi-Frequency Biophysical Soil Respiration Model. APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Burns, E., Montenegro, A., Risk, D. Soil Respiration Deserves More Attention in Climate Models. APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Mason, S., Risk, D. Carbon offsetting though the flaring and collecting of methane gas from community landfills. APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Louiseize, N., Risk, D. Winter CO2 Fluxes from a Nova Scotian Bog. APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Nickerson, N., Egan, J., Risk, D. A novel method to measure the isotope ratio of soil respiration. APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Egan, J., Nickerson, N., Risk, D. Can tree girdling help distinguish between heterotrophic and autotrophic soil respiration in a NS pine plot? APICS Agriculture and Fisheries, Biology and Environmental Studies Conference, Halifax, NS, Mar 2011.
Owens, J., Risk, D., Nickerson, N. Development of Real-Time Soil Carbon Ecoinformatics Infrastructure Using Observational Network Data. American Geophysical Union, San Francisco, CA, Dec 2010.
Nickerson, N., Phillips, C., Risk, D. A multi-time scale, non-linear approach to understanding soil respiration. American Geophysical Union, San Francisco, CA, Dec 2010.
Creelman, C.A., Nickerson, N., Risk, D. Quantifying soil CO2 respiration measurement error across instruments using numerical models. American Geophysical Union, San Francisco, CA, Dec 2010.
Risk, D., Nickerson, N., Owens, J., Creelman, C., McArthur, G., Phillips, C.L., Bourlon, E., Hart, C., Montenegro, A., Burns, E., Preparing for the Future: A Soil CO2 Observatory for the North American Arctic. ArcticNet Annual Meeting, Ottawa December 2010.
Risk, D., Nickerson, N., McArthur, G., Creelman, Cl, Phillips, C.L., Bourlon, E., Simpson, K., Montenegro, A., Burns, E. Towards a Soil CO2 Observation System for the North American Arctic. Oslo International Polar Year Meeting, Oslo, May 2010.
McArthur, G., Risk, D., Beltrami, H., Kellman, L., Calibration and Verification of the Flux Solution Technology, American Geophysical Union, Toronto, ON, May 2009.
McArthur, G., Risk, D., Nickerson, N., Beltrami, H., Kellman, L., Klapstein, S., CT-FD; a New Technique for Continuous Long‐Term Measurement of CO2 Efflux, American Geophysical Union, Toronto, ON, May 2009.
McArthur, G., Risk, D., Nickerson, N., Beltrami, H., Kellman, L., CT-FD; a New Technique for Continuous Long‐Term Measurement of CO2 Efflux, European Geophysical Union General Assembly, Vienna, April 2009.
Risk, D., Nickerson, N., Phillips, C., Van Pelt, A., Kellman, L., Physical Controls on the Isotopic Composition of Soil Respired δ13CO2, European Geophysical Union General Assembly, Vienna, April 2009.
Risk, D., Nickerson, N., Phillips, C., Van Pelt, A., Kellman, L., Physical Controls on the Isotopic Composition of Soil Respired CO2, American Geophysical Union, San Francisco, CA, Dec 2008.
McArthur, G., Risk, D., Nickerson, N., Beltrami, H., A new technique for continuous long-term measurement of CO2 efflux, American Geophysical Union, San Francisco, Dec 2008.
Phillips, C., Nickerson, N., Risk, D., Kayler, Z., Bond, B., Mix, A., Soil Drying Effects on the δ13C Composition of Soil Respiration, American Geophysical Union, San Francisco, Dec 2008.
Nickerson, N., Risk, D., Isotope end-member mixing models are non-linear in non-steady state diffusive environments, American Geophysical Union, San Francisco, Dec 2008.
Rahn, T., McDowell, N., Powers, H., Risk, D., Nickerson, N., Bible, K., Van Pelt, A., Rella, C., Wahl, E., Continuous, In-Situ Isotopic CO2 Measurements of Ecosystem Exchange Processes and Soil Respiration Using a WS-CRDS Analyzer, American Geophysical Union, San Francisco, 2008.
Rahn, T., McDowell, N., Powers, H., Risk, D., Nickerson, N., Van Pelt, A., Rella, C., Wahl, E., Continuous Isotopic CO2 Measurements by Wavelength-Scanned Cavity Ring Down Spectroscopy: Studies of Exchange Processes in Terrestrial Ecosystems, European Stable Isotope Meeting, 2008
Rahn, T., McDowell, N., Powers, H., Risk, D., Nickerson, N., Van Pelt, A., Rella, C., Wahl, E., Continuous Isotopic CO2 Measurements by Wavelength-Scanned Cavity Ring Down Spectroscopy: Studies of Exchange Processes in Terrestrial Ecosystems, International Conference on Applications of Stable Isotope Techniques to Ecological Studies, Honolulu, Sept. 2008.
Nickerson, N., Risk, D. Isotopic Fractionation in Non-Steady State Diffusive Soil-Atmosphere Environments, Canadian Meteorological and Oceanographic Society Meeting, Kelowna, May 2008.
Nickerson, N., Risk, D. Carbon Capture and Storage Monitoring Technology Development at StFX, Nova Scotia Energy Research and Development Forum, Antigonish, April 2008.
Nickerson, N., Risk, D. The Isotopic Signature of Soil CO2 Flux in Non-Steady State Environments, Atlantic Provinces Council for Sciences Meeting, Antigonish, March 2008.
Risk, D., and N. Nickerson. Soil CO2 Emissions: Changes in effective diffusivity due to sustained winds. American Geophysical Union Meeting, San Francisco, Dec. 2007.
Risk, D., and L. Kellman. Isotopic Fractionation in Non-Equilibrium Diffusive Environments: Implications for Chamber- Based Studies of Soil Gas Fluxes, American Geophysical Union Meeting, San Francisco, Dec. 2007.
Risk, D. Kellman, L., Beltrami, H., and A. Diochon. In-Situ and Laboratory Incubations Highlight the Climatic Sensitivity of Soil Organic Matter Pools. Canadian Geophysical Union/ Canadian Meteorological Society, St. John's, May 2007.
Risk, D. Technologies for Non-Invasive Surface Gas Monitoring. Nova Scotia Environmental Industry Association Remediation Forum, Halifax, NS, March 2007.
I am currently seeking a graduate student (MSc or PhD) for a project related to the development of distributed all-optical CO2 sensors for environmental monitoring. This large multidisciplinary project across four universities (Universities of Toronto, Victoria, Calgary, and St. Francis Xavier University) applies a new all-optical approach to CO2 sensing, using a multiplexed array of fiber Bragg grating-based refractive index sensors. These sensors will have the capacity to measure CO2 at multiple measurement points simultaneously in challenging environments including down deep boreholes, along the ocean floor, and also in more routine surface applications. The graduate student resident at St. Francis Xavier University will, under the supervision of Dave Risk, be required to carry out research and development related to chemical (solution/surface) aspects of the new sensing technique, and help develop the sensor for field applications. The student will work closely with team members at other universities. This project will require the use of numerical modeling (physical, chemical), laboratory testing, and outdoor work in the later stages of the project. The candidate should have; a degree in chemistry, ideally with an emphasis on physical or environmental chemistry; should have strong hands-on laboratory/analytical experience; and ideally also some outdoor/environmental field experience. A quantitative and/or coding background is also required, to use as a launching pad for numerical modelling work. Lastly, good communication skills are required for working effectively in the cross-institutional team. Students will be encouraged to take part in the the St. Francis Xavier University Collaborative Research Experience and Training Experience Program for Climate Science (CREATE-TPCS). For more information, please contact Dave.
Earth Sciences
St. Francis Xavier University
PO Box 5000
Antigonish, NS, Canada
B2G 2W5
Office: (902) 867-5282
Lab: (902) 867-4854
Fax: (902) 867-2414