Forest Atmosphere Boundary Layer Experiment

09/01/1997 - 08/31/2000
Project Location
Park Falls, Wisconsin

An NCAR ISS will be deployed at the Park Falls, Wisconis tall tower site (WLEF-TV tower, instrumented as part of the Chequamegon Ecosystem-Atmosphere Study, http://cheas.umn.edu) for the month of August, 2000. The deployment will conincide both with continuous flux and mixing ratio measurements collected from WLEF and, most importantly, with a series of airborne over-flights conducted as part of the CO2 Budget and Rectification Airborne study (COBRA). The one-month COBRA intensive will provide direct validation of the CO2 profile calculations being conducted as part of the Forest Atmosphereic Boundary Layer Experiment (FABLE). FABLE has utilized the NCAR Integrated Sounding Systems (ISS) during 1998 at WLEF, and during 1999 at WLEF and Walker Branch Watershead, Oak Ridge, Tennessee. One goal of this study is to determine the seasonal pattern of the vertical distribution of CO2 in the boundary layer and lower troposphere. An understanding of this distribution is needed to proplery interpret the global network of CO2 flask samples that is used to constrain the global carbon budget. FABLE is relying on the tall tower CO2 mixing ratio data (maximum altitude 396m) and rawinsonde temperature and humidity data to validate their methodology. Direct observations of the vertical and horizontal distribution of CO2 that can be obtained via the COBRA aircraft will provide a valuable additional test of the FABLE results. The ISS will also add wind profile that has proven very valuable, in a June 1999 test flight, to interpreting the vertical profiles of CO2 and other chemical tracers obtained by the COBRA aircraft.


  1. Observe and simulate how surface processes and boundary-layer development interact to modulate NEE of CO2.
  2. Derive tropospheric CO2 mixing ratios via estimates of the entertainment flux and compare the modeled values.
  3. See if the the results vary across North America and/or ecosystems.

For more information, please visit the ChEAS Penn State Page.


Principal Investigator:

   Name: Kenneth J. Davis

   Institution: University of Minnesota

   Address: 1991 Upper Buford Circle, St. Paul, MN 55108

   Phone: 612-625-2774

   FAX: 612-625-2208

   Email: davis@soils.umn.edu


Data Manager: