The ISFS 30 minute flux dataset for PCAPS contains sensible and latent heat fluxes, friction velocity, total radiation and surface heat flux, as measured by the 7 NCAR Integrated Surface Flux System (ISFS) stations during PCAPS.
The dataset consists of 4 small NetCDF files on the EOL CODIAC site.
- pcaps30m_20101101.nc
- pcaps30m_20101201.nc
- pcaps30m_20110101.nc
- pcaps30m_20110201.nc
Each file contains one month's data starting at the first of the month indicated in the file name
The missing data value is 1.0 x 1037, indicating data is not available at the corresponding time for the given variable. The first ISFS measurements were recorded on Nov 10, 2010. Therefore, values for all time-series variables will be filled with 1x1037 for the initial portion of pcaps30m_20101101.nc.
The variables in the NetCDF files are defined by one or more of the following dimensions:
| Dimension name | size | description |
|---|---|---|
| time | 1440 or 1448 | number of 1/2 hour periods in the month |
| station | 7 | index for each of the 7 ISFS stations |
The variables in the NetCDF files are:
| Variable name | units | dimensions | description |
|---|---|---|---|
| base_time | seconds | none (scalar) | POSIX time, non-leap seconds since 1970-01-01 00:00:00 00:00 UTC of 0:00 UTC of the first day of the month |
| time | seconds | time | middle of sampling period, in seconds since base_time. |
| LE | W/m2 | time,station | latent heat flux, positive is upward |
| H | W/m2 | time,station | sensible heat flux, positive is upward |
| u_ (*) | m/s | time,station | u*, friction velocity |
| Rsum | W/m2 | time,station | total radiation, positive downward, from pyranometer and pyrgeometer measurements at 2 meters |
| Gsfc | W/m2 | time,station | surface heat flux, positive is upward |
| Gsfc_aux | W/m2 | time,station | surface heat flux at auxiliary soil measurement sites of stations 1, 5 and 6 |
| latitude | degrees-north | station | |
| longitude | degrees-east | station | |
| altitude | m | station | Approximate station altitude, above sea level |
| sonicHeight | m | station | Approximate height above ground of sonic anemometer and fast hygrometer eddy correlation measurements |
* By convention, NetCDF variable names are limited to A-Z, a-z, 0-9 and underscore characters. The usual name for the friction velocity is "u*", which is converted to "u_" as a NetCDF variable. See the "short_name" attribute for each variable, which does not have a restricted character set.