FINAL REPORT: EDDY-COVARIANCE FLUX TOWER AND TRACER TECHNOLOGY SUPPORT FOR THE UNIVERSITY OF GEORGIA PROPOSAL: FROM TOWER TO PIXEL: INTEGRATION OF PATCH-SIZE NEE USING EXPERIMENTAL MODELING FOOTPRINT ANALYSIS. Page: 5 of 7
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increases in quality assurance and safety, and enabled reporting in near real-time of a new fire
hazard indicator called the Drought Stress Index (DSI) (Clark et al., in preparation).
There are currently three AmeriFlux towers in the New Jersey Pine Barrens. Each tower
installation contains essentially the same instrumentation. Originally there were two data
collection subsystems at each tower that operated completely independently of each other.
The first subsystem consists of a three-dimensional sonic anemometer, a closed-path CO2/H20
infrared gas analyzer (IRGA), a laptop computer, and supporting equipment. The linearized
DAC outputs of the IRGA are connected to two of the auxiliary ADC inputs of the sonic
anemometer. Data (u, v, w, sonic temperature, [C02] and [H20] as millivolts, and instrument
status word) are transferred as ASCII strings from the RS232 serial output of the sonic
anemometer to the laptop computer at a rate of 10 Hz. The program Hyperterm, included with
Microsoft Windows, was used to read data records and recorded them to disk. The process is
very simple and robust, but Hyperterm just copies records into files. There were no quality
checks performed on the data as it was collected and records were not time stamped. Scientists
periodically climbed the towers to retrieve the computers, transferred the data to a workstation
and then replaced the computers.
The second subsystem was centered around a Campbell Scientific CR23X datalogger. The
datalogger measures solar energy, PAR, net radiation, air temperature, relative humidity, wind
speed, wind direction, rain, three soil heat flux plates, three soil temperatures, three fuel stick
temperatures, and three fuel stick moisture levels every ten seconds, and saves 30-minute
averages. A digital cellular modem is attached to the RS232 port of the CR23X datalogger.
Every half hour a computer at Rutgers University in New Brunswick calls to collect the
30-minute data from the CR23X. The data are processed and made available on a statewide web
site for meteorology and fire hazard conditions. However, the Drought Stress Index was not
available since it requires measurements from the eddy flux subsystem.
Enhancements included both hardware and software improvements:
1) Dropping a weather proof, surge protected Cat5 Ethernet cable from the eddy flux computer
at the top of the tower to a junction box at the base of the tower and installing Symantec
PCAnywhere (a remote access program) on the eddy flux computer. These additions allowed
operators to access the computer without climbing the tower for diagnostics, maintenance,
and eddy flux data downloads. They also allowed the same activities to be performed on the
datalogger through the hardware link between the eddy flux computer and the logger.
2) Installation of the ECCheck program written by BNL to replace Hyperterm for eddy flux data
collection. ECCheck provides graphics, QC monitoring, output record time stamping,
1-minute averages, 30-minute averages and covariances. The averages and covariances are
made available on a TCP/IP socket.
3) Installation of a serial PCMCIA card as the second RS232 port on the eddy flux computer.
4) Installation of a link (cable and SC32B converter) from the second RS232 port to the CS I/O
port of the datalogger.
5) Installation of the software program DataXbar, also written by BNL. This is a data transfer
program that collects 30-minute averages and covariances from the TCP/IP socket of
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LEWIN,K.F.; NAGY, J. & WATSON, T.B. FINAL REPORT: EDDY-COVARIANCE FLUX TOWER AND TRACER TECHNOLOGY SUPPORT FOR THE UNIVERSITY OF GEORGIA PROPOSAL: FROM TOWER TO PIXEL: INTEGRATION OF PATCH-SIZE NEE USING EXPERIMENTAL MODELING FOOTPRINT ANALYSIS., report, September 1, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc898144/m1/5/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.