Data Products
How to cite ITP data:
ITP data are archived at the NOAA National Centers for Environmental Information repository (Toole et al., 2016) via https://doi.org/10.7289/v5mw2f7x.
Reference: Toole, JM, RA Krishfield, JK O’Brien, A Houk, ST Cole, and the Woods Hole Oceanographic Institution Ice-Tethered Profiler Program (2016), Ice-Tethered Profiler observations: Vertical profiles of temperature, salinity, oxygen, and ocean velocity from an Ice-Tethered buoy system. NOAA National Centers for Environmental Information. Dataset, https://doi.org/10.7289/v5mw2f7x. Accessed [date].
How to acknowledge ITP data:
We ask that the following acknowledgment be given when ITP data are used:
"The Ice-Tethered Profiler data were collected and made available by the Ice-Tethered Profiler Program (Toole et al., 2011; Krishfield et al., 2008) based at the Woods Hole Oceanographic Institution (https://www.whoi.edu/itp)."
Krishfield, R., J. Toole, A. Proshutinsky, and M.-L. Timmermans, 2008. Automated Ice-Tethered Profilers for seawater observations under pack ice in all seasons. Journal of Atmospheric and Oceanic Technology, 25, Issue 11, 2091-2105.
Toole, J.M., R.A. Krishfield, M.-L. Timmermans and A. Proshutinsky, 2011. The Ice-Tethered Profiler: Argo of the Arctic. Oceanography, Toole, 24(3):126–135, Oceanography 24(3):126–135, https://doi.org/10.5670/oceanog.2011.64.
If you are using ITP data, please provide us with a citation to include in our compilation of publications that utilize ITP data (contact us).
How to access ITP data:
Data from ITPs (See the Technology section under Background for detailed description of the raw observations) at three levels of processing are available via the WHOI ITP data repository.
NOTE: We are currently working towards making ITP data available in netCDF format in addition to our long-standing Matlab format. This improvement will be phased in slowly beginning with active systems.
LEVEL 1 RAW DATA are received from each ITP after each one-way profile is completed. The data are made available shortly after reception (typically within a few hours) by an automated routine. GPS position information for each system (logged at hourly or half-hourly rate) are received once per day. The location data are unedited and unfiltered; the scientific and engineering data are extracted from the binary files transmitted by the ITPs, but no other processing, cleaning or smoothing is performed.
Level 1 profile data files from each ITP system are available via the WHOI ITP data repository in files named itpNrawmat.tar.Z (Matlab format) and itpsysN_raw.nc (netCDF format; forthcoming for completed missions), where N is the ITP system number. The GPS position data are contained in files named itpNrawlocs.dat (ASCII format). For additional documentation of the data format, download the linked pdf files at right.
LEVEL 2 REAL TIME DATA are created from the Level 1 raw data by automated routines. File updates occur several times per day. At this level of processing, the location data are filtered and interpolated to the times of each profile, while the scientific and engineering data are averaged in 2-db bins. No sensor response corrections, secondary calibration or editing are applied to these products. This form of the data are displayed graphically in the Status pages for each system on this website.
Level 2 data are available via the WHOI ITP data repository in files named itpNgriddata.zip (Matlab format) and itpsysNgriddata.nc (netCDF format; forthcoming), where N is the ITP system number. In addition, the most recently-acquired data from each ITP system are available in files named itpNlast.dat (ASCII format). For additional documentation of the data format, download the linked pdf files at right.
LEVEL 3 ARCHIVE DATA are our best estimates of the ocean properties derived from the ITP sensor observations. These data have had sensor response corrections applied, regional conductivity adjustments made based on historical hydrographic data, and edits performed. Level 3 data products are derived for each ITP system after its mission has ended. A full description of the ITP data processing procedure is provided via the linked pdf file at right.
Level 3 data are available in two forms via the WHOI ITP data repository. The first are Matlab-format data at the basic sensor sample rate. These data are in files named itpNcormat.zip (Matlab format; one file per profile) and itpsysNcor.nc (netCDF format; forthcoming). The second form of Level 3 data have been pressure-bin-averaged at 1-db vertical resolution. These data are in files named itpNfinal.zip (Matlab format) and itpsysNfinal.nc (netCDF format; forthcoming). For additional documentation of the data format, download the linked pdf files at right.
Related Files
- ITP Data Processing Procedures
The processing procedure implemented on data from the first 5 ITPs that were deployed to produce final (Level 3 data). - ITP File Documentation
Documentation of the file formats for the three different data levels.