HR: 1340h
AN: B43D-1578    [Abstracts]
TI: In Situ Measurements of Atmospheric O2 and CO2 in a Central Massachusetts Forest
AU: * Hart, R
EM: rhart2@bowdoin.edu
AF: Bowdoin College, Dept. of Physics & Astronomy 8800 College Sta., Brunswick, ME 04011, United States
AU: Battle, M O
EM: mbattle@bowdoin.edu
AF: Bowdoin College, Dept. of Physics & Astronomy 8800 College Sta., Brunswick, ME 04011, United States
AU: Sofen, E
EM: esofen@u.washington.edu
AF: Bowdoin College, Dept. of Physics & Astronomy 8800 College Sta., Brunswick, ME 04011, United States
AU: Sofen, E
EM: esofen@u.washington.edu
AF: Now at University of Washington, Dept. of Atmospheric Sciences Box 351640, Seattle, WA 98195, United States
AU: Perry, R
EM: rperry@globalenergyconcepts.com
AF: Bowdoin College, Dept. of Physics & Astronomy 8800 College Sta., Brunswick, ME 04011, United States
AU: Perry, R
EM: rperry@globalenergyconcepts.com
AF: Now at Global Energy Concepts, 1809 7th Avenue Suite 900, Seattle, WA 98101-1393, United States
AU: Carpenter, J
EM: John.Carpenter@ametek.com
AF: Bowdoin College, Dept. of Physics & Astronomy 8800 College Sta., Brunswick, ME 04011, United States
AU: Carpenter, J
EM: John.Carpenter@ametek.com
AF: Now at TSL/EDAX, 392 East 12300 South Suite H, Draper, UT 84020, United States
AB: Simultaneous and continuous measurements of O₂ and CO₂ made in the air around terrestrial ecosystems have the potential to improve our understanding of the biogeochemistry of the ecosystem, and may reduce uncertainties in estimates of terrestrial carbon uptake derived from atmospheric O₂ measurements. Following the design of Stephens et al. [2007], we have constructed an instrument that performs continuous in situ measurements of atmospheric O₂ and CO₂ concentrations. We present design and performance data, along with recent results from a deployment at the Environmental Measurement Site at Harvard Forest in central Massachusetts. Preliminary results show that O₂ and CO₂ covary with well- defined stoichiometries that differ in summer and winter months. During the growing season, values are close to 1.0, consistent with photosynthesis and respiration of sugars. In the winter, values are elevated (around 1.2), possibly reflecting the signature of fossil fuel combustion occurring outside of the immediate study area.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0428 Carbon cycling (4806)
DE: 0439 Ecosystems, structure and dynamics (4815)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting