HR: 10:35h
AN: A12B-02    [Abstracts]
TI: The impact of large-scale dynamics on the variability of total column CO2
AU: * Keppel-Aleks, G
EM: gka@gps.caltech.edu
AF: California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, United States
AU: Wennberg, P O
EM: wennberg@gps.caltech.edu
AF: California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, United States
AU: Schneider, T
EM: tapio@gps.caltech.edu
AF: California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, United States
AU: Peters, W
EM: wouter.peters@noaa.gov
AF: NOAA Earth System Research Lab & Wageningen Research University, 325 Broadway, Boulder, CO 80305, United States
AU: Wofsy, S C
EM: swofsy@seas.harvard.edu
AF: Harvard University, 29 Oxford Street, Cambridge, MA 02138, United States
AU: Toon, G C
EM: geoffrey.c.toon@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 E Orange Grove Drive, Pasadena, CA 91109, United States
AB: Ground-based measurements of total column CO2 have been made at Park Falls, Wisconsin beginning in 2004. Solar spectra are obtained under clear sky conditions using a high-resolution Fourier Transform Spectrometer (FTS). These spectra are analyzed using a line-by-line retrieval to obtain precise and accurate measurements of the CO2 and other greenhouse gas columns. During summertime, significant variability in the total column CO2 is observed. This variability reflects the large footprint of column observations and may facilitate estimation of continental-scale CO2 exchange between the atmosphere and the terrestrial biosphere from a single ground site. We use three approaches to understand the CO2 column variability at Park Falls. We use STILT to determine influence functions for the CO2 at Park Falls. We analyze these regions of influence to determine the correlation between the origin of CO2 at the surface and daily anomalies observed in the total column. Secondly, we use our measurements in conjunction with CarbonTracker reanalyzed CO2 fields to explore the relationship between large-scale dynamic activity and total column CO2 both at Park Falls and in neighboring regions. Finally, we use the GFDL AM2 model to explore the sensitivity of simulated CO2 synoptic variability to various convective parameterizations methods.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0428 Carbon cycling (4806)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting