NIWOT07

Niwot Ridge Pilot Experiment, 2006-2007

PROJECT DATES
01/01/2007 - 10/19/2007
Project Location
Niwot Ridge, Colorado
PROJECT DESCRIPTION

In support of a NSF-supported project to investigate the use of sensor networks for biogeoscience research, NCAR and CU deployed additional equipment at the Univ. Colo. Flux Facility (CUFF) in the Univ. Colo. Mountain Research Station (MRS). Initial equipment setup started in Summer 2006, with the majority of measurements to be made in Spring/Summer 2007.

This was the first real deployment of the new NCAR/EOL TRAnsect Measurement (TRAM) system. Two TRAM transects currently are planned for this study. The first crosses Como Creek and a few other minor drainages from north to south. It is about 105~m each way along one line of 11 towers, with measurements at 1m above ground (low trunk space) one way and 5m above ground (middle of dense foliage) returning. This transect supports the study of nocturnal transport of CO2 by drainage flows.

The second transect will span the 150m distance between the CUFF main tower and the USGS tower to the West.

Como Creek Dataset

5 minute statistics from instrumentation at Como Creek are available in NetCDF form via the Data Access link. The instrumentation consisted of three 3-D sonic anemometers, a barometer, hygrothermometer and a 2-D anemometer, which were deployed from Oct 11, 2006 to Oct 19, 2007.

From 2006 to May 17, 2007 the 3-D sonic anemometers were nominally at 0.5, 1 and 2 meters above ground.  

From Jul 1, 2007 to Oct 19 he 3-D sonic anemometers were nominally at 0.5, 1.5 and 2.5 meters above ground.  

For both deployments, the ATI anemometers were pointing south and the u and v values, and their co-variances, have not been rotated from anemometer coordinates.  

The wind directions from the 2-D anemometer, Dir_1m and Dir_1_5m are relative to true north.

Information on the ISFS NetCDF file format is available at https://www.eol.ucar.edu/content/isfs-netcdf-files.

Hydra Dataset

The hydra is a  CO2 measurement system,  capable of multiplexed sampling of 18 inlets and four calibration gases . Air is continuously drawn in from the inlets, and a valve system allows a closed-path Licor 7000 to sample each inlet in succession, as well as the calibration gases. The hydra was similar to that used in 2002, as described in  https://www.eol.ucar.edu/system/files/hydra.pdf.

See also http://www2.mmm.ucar.edu/abl/cme/data_hydra/.   For a calibrated version of the dataset, see  http://www2.mmm.ucar.edu/abl/cme/data_hydra/hydra_cme07_co2.dat

Hydra Inlets
Hydra Port Inlet Name Latitude Longitude Height (m)
A1 T1-L  
40.035327776
105.545123627
1.22
A2 T4-U
40.035052558
105.545148437
4.90
A3 T11-L
40.034513597
105.545444384
1.22
A4        
A5 T11-U 
40.034513597
105.545444384
3.58
A6        
A7 U-COMO2
40.034603513
105.546720428
1.22
A8 CUFF (at 1m) 
40.032875056
105.546970780
1.00
A9 US2
40.034287807
105.546270761
1.22
B1 T1-U
40.035327776
105.545123627
3.38
B2 T4-M
40.035052558
105.545148437
3.23
B3 T4-L
40.035052558
105.545148437
1.22
B4 COMO1
40.034892639
105.545460794
1.0
B5 US1

 
40.034135377
105.546698535
1.22
B6 UN-2

 
40.034999959
105.545547832
1.22
B7 UN-1

 
40.035063261
105.547343401
1.22
B8 T9-L

 
40.034631299
105.545239229
1.22
B9 T9-U
40.034631299
105.545239229
5.89

 

Calibration inlets
Hydra Port Calibration Gas
C1 not used
C2 N2 or JA02103 or JJ16850
C3 not used
C4 JJ14766

 

 
Calibration gases
Tank ppm
JA02103 349.215
JJ14766 383.639
JJ16850 417.131

 

 

    The NIWOT07 hydra dataset consists of NetCDF files containing 30 minute averages of the CO2 mixing ratio from the inlets as well as the calibration gases.

    The values of the CO2 mixing ratios are as reported by the Licor-7000, and have not been corrected by the calibration gas values.

    CONTACT INFORMATION

    Project Manager: