Instantaneous Dynamic Ocean Topography (iDOT)
Instantaneous Dynamic Ocean Topography Profiles (iDOT) from Multi-Mission Satellite AltimetryThe instantaneous DOT profiles (iDOT) are derived as deviation between the actual sea surface heights SSH and the geoid heights N along individual profiles observed by nearly all satellite altimeter missions operating since end of 1992 following the "profile approach", developed by Bosch et al., 2014.
Both, SSH and N are consistently filtered by a Gauss-type filter (Jekeli-Wahr, J/W) with half widths of about 69 km. This way, the iDOT profiles realize smoothed snapshots of the ocean topography and may be used to characterize the temporal evolution of the DOT since late 1992. Moreover, as the data of all satellite altimeter missions have been carefully harmonized and cross-calibrated in advance (following the approach of Bosch et al., 2014), it should be possible to merge and combine iDOT profiles of any mission in order to improve the spatial and temporal resolution. Due to the filter length of 69 km the iDOT profiles carry the signature of meso-scale pattern and can be taken to illustrate evolution and kinematics of Eddies and of the geostrophic velocity field.
Available Dataset(s)
Available version(s) of the product "Instantaneous Dynamic Ocean Topography Profiles (iDOT)" in OpenADB.
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Instantaneous Dynamic Ocean Topography (iDOT)
Version 33 (Geoid model: GOCO05S, Filter: J/W-Filter 69km, Filter correction based on EIGEN6c4)
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The iDOT-profiles are distributed here in the hope that they will be useful, but DGFI-TUM provides these data "as is" without warranty, expressed or implied, as to the use or appropriateness of the iDOT-profiles, and there are no warranties of merchantability or fitness of these data for a particular purpose or use.
Data Format
| Parameter | Description |
|---|---|
| glon | Longitude of Satellite Footprint |
| glat | Latitude of Satellite Footprint |
| jday | Julian Day 2000 |
| dot | Instantaneous Dynamic Ocean Topography |
| gflags | Geophysical Corrections Quality Flags |
| oflags | Orbit Status and Quality Flags |
| iflags | Instrument Status and Quality Flags |
The data will be provided in NetCDF. More details on the data are available here.
How to cite this dataset
When using this data please cite: "The iDOTs were produced by DGFI-TUM based on multi-mission altimeter data and distributed via OpenADB (http://openadb.dgfi.tum.de). More details on the product may be found in (Bosch et al, 2013)."
Please also give credit to the respective institution(s) in charge of mission operation and maintenance (see bottom of this page).
All products are computed based on altimetry missions operated by NASA/CNES (TOPEX, Jason-1), ESA (ERS-1/2, Envisat, Cryosat-2), USNavy (Geosat,GFO), CNES/NASA/EUMETSAT/NOAA (Jason-2, Jason-3), ISRO/CNES (SARAL), EUMETSAT (Sentinel-3A/-3B), and NASA/EUMETSAT (Sentinel-6A). The original datasets are disseminated by AVISO, ESA, EUMETSAT, NOAA, and PO.DAAC.