HR: 1340h
AN: A13A-0093    [Abstracts]
TI: Estimations of Regional CO2 Fluxes - Analysis of Concentration Data From the Ring of Towers in Northern Wisconsin
AU: * Richardson, S J
EM: srichardson@psu.edu
AF: Department of Meteorology, The Pennsylvania State University, 503 Walker Building, University Park, PA 16802 United States
AU: Miles, N L
EM: nmiles@essc.psu.edu
AF: Department of Meteorology, The Pennsylvania State University, 503 Walker Building, University Park, PA 16802 United States
AU: Davis, K J
EM: davis@essc.psu.edu
AF: Department of Meteorology, The Pennsylvania State University, 503 Walker Building, University Park, PA 16802 United States
AU: Uliasz, M
EM: marek@atmos.colostate.edu
AF: Department of Atmospheric Science, Colorado State University, 200 West Lake Street, Fort Collins, CO 80523 United States
AU: Denning, S
EM: denning@atmos.colostate.edu
AF: Department of Atmospheric Science, Colorado State University, 200 West Lake Street, Fort Collins, CO 80523 United States
AB: Inverse studies of CO2 mixing ratio are traditionally conducted at coarse spatial and temporal resolution. This limits our ability to evaluate efforts to upscale chamber and stand level CO2 flux measurements to regional scales, where coherent climate and ecosystem mechanisms govern the carbon cycle. We present an effort to implement atmospheric budget or inversion methodology on a regional scale. A first step towards this end is the evaluation of a network of six relatively inexpensive CO2 mixing ratio measurement systems deployed on towers in northern Wisconsin as part of the Chequamegon Ecosystem-Atmosphere Study (ChEAS). Five systems were distributed on a circle of roughly 150-km radius, while one system is centrally located. All measurements were taken at a height of 76 m. The systems used LiCor-820 infrared CO2 analyzers and were calibrated every two hours using four samples known to within +-0.1 ppm CO2. Field tests prior to deployment in which the six systems sampled the same air indicate agreement of the systems to better than 0.3 ppm from the mean. The six systems were fielded from April to August 2004. Several frontal passage events were observed, and the progression of the front is evidenced in the CO2 concentrations measured by the network. Pollution events were also observed and trajectory analysis was used to examine the source of the air. Results from the 2004 deployment are presented.
DE: 3322 Land/atmosphere interactions
DE: 1694 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting