HR: 0800h
AN: B51A-0922    [Abstracts]
TI: HYDRA: A Programmable Portable Trace-Gas Measuring System
AU: * Burns, S P
EM: sean@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: * Burns, S P
EM: sean@ucar.edu
AF: Department of Ecology and Evolutionary Biology, Campus Box 334 University of Colorado, Boulder, CO 80309-0334 United States
AU: Delany, A C
EM: delany@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Maclean, G
EM: maclean@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Oncley, S P
EM: oncley@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Semmer, S R
EM: semmer@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Sun, J
EM: jsun@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Monson, R K
EM: russell.monson@colorado.edu
AF: Department of Ecology and Evolutionary Biology, Campus Box 334 University of Colorado, Boulder, CO 80309-0334 United States
AB: A multi-inlet, portable, air-sampling system (called ``HYDRA'') has been designed and constructed by the NCAR Atmospheric Technology Division (ATD). Since 2002 it has been deployed in field projects on both sides of the Atlantic Ocean (in Colorado and Germany). In the summer of 2002 HYDRA was used in a NCAR pilot project to study CO$_2$ advective transport in a sub-alpine forest below Niwot Ridge, Colorado, and, in the winter of 2003-2004, it was used to study undersnow horizontal and vertical gradients of CO$_2$ in the sub-alpine forest snowpack. In these experiments HYDRA was used in conjunction with a LICOR-7000 sensor (for measuring CO$_2$ and water vapor). Accuracy of the LICOR-7000 is enhanced by the use of three different calibration gases. A physical description of HYDRA, calibration and data reduction procedures, and preliminary results from the two above experiments are presented.
DE: 3394 Instruments and techniques
DE: 3307 Boundary layer processes
DE: 1615 Biogeochemical processes (4805)
DE: 0315 Biosphere/atmosphere interactions
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting