Net ecosystem exchange inferred from eddy covariance flux and total column measurements
Gretchen
Keppel-Aleks, California Institute of Technology, gka@gps.caltech.edu
(Presenting)
Rebecca
A
Washenfelder, NOAA, rebecca.washenfelder@noaa.gov
Geoffrey
C
Toon, JPL, geoffrey.c.toon@jpl.nasa.gov
Ankur
R
Desai, University of Wisconsin, desai@aos.wisc.edu
Kenneth
J
Davis, Pennsylvania State University, davis@meteo.psu.edu
Paul
O
Wennberg, California Institute of Technology, wennberg@gps.caltech.edu
Measurements of total column CO2 at the WLEF tall tower site in Northern Wisconsin are used to calculate CO2 exchange on seasonal and daily timescales. The data are obtained by high resolution direct solar absorption spectrometry, as part of the Total Carbon Column Observing Network (TCCON). During near cloud free conditions, we obtain measurements throughout the day, and the diurnal change in the total column CO2 can be used to infer surface exchange. We explore methods to correct for the influence of advection on changes in total column CO2 on hourly timescales, in order to isolate the effect of surface exchange on changes in the total column. Surface exchange rates inferred from total column CO2 show reasonable agreement with NEE obtained from eddy covariance flux measurements made on the WLEF tall tower.
Presentation Type: Poster
Poster Session: Carbon Cycle Science
NASA TE Funded Awards Represented:
Wennberg, Paul
The Total Carbon Column Observing Network (TCCON): Ground-based Observations in Support of the Orbiting Carbon Observatory