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Instantaneous Dynamic Ocean Topography (iDOT)

Instantaneous Dynamic Ocean Topography Profiles (iDOT) from Multi-Mission Satellite Altimetry
Instantaneous Dynamic Ocean Topography Profiles (iDOT) from Multi-Mission Satellite Altimetry

The 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.

Instantaneous Dynamic Ocean Topography (iDOT)

Version 33 (Geoid model: GOCO05S, Filter: J/W-Filter 69km, Filter correction based on EIGEN6c4)
  • Mission Freq. Cycles Dates
    Cryosat-2 1 Hz 004 - 089 2010-07-16 00:21:47 - 2017-03-05 00:24:20
    Envisat 1 Hz 008 - 094 2002-07-22 21:41:50 - 2010-10-19 02:56:07
    Envisat (Extended Mission) 1 Hz 096 - 113 2010-10-27 23:59:26 - 2012-04-03 23:49:17
    ERS-1 (Phase C) 1 Hz 087 - 101 1992-09-01 11:59:33 - 1993-12-23 19:42:38
    ERS-1 (Phase D) 1 Hz 103 - 138 1993-12-24 23:29:49 - 1994-04-10 16:04:03
    ERS-1 (Phase E) 1 Hz 139 - 140 1994-04-11 20:05:34 - 1994-09-27 23:24:14
    ERS-1 (Phase F) 1 Hz 141 - 143 1994-09-28 10:07:00 - 1995-03-23 21:40:29
    ERS-1 (Phase G) 1 Hz 144 - 156 1995-03-24 02:11:00 - 1996-06-02 21:57:50
    ERS-2 1 Hz 000 - 085 1995-05-14 01:47:11 - 2003-07-02 07:09:09
    Geosat Follow-On 1 Hz 037 - 220 2000-01-07 17:32:58 - 2008-07-28 23:30:57
    Jason-1 1 Hz 001 - 259 2002-01-15 06:29:49 - 2009-01-26 08:49:42
    Jason-1 (Extended Mission) 1 Hz 262 - 374 2009-02-10 18:01:37 - 2012-03-03 12:59:11
    Jason-2 1 Hz 001 - 291 2008-07-12 01:25:39 - 2016-06-05 12:11:11
    Jason-2 (Extended Mission) 1 Hz 305 - 319 2016-10-13 20:01:19 - 2017-03-05 04:35:37
    Jason-3 1 Hz 001 - 033 2016-02-17 10:28:53 - 2017-01-09 15:40:08
    Poseidon 1 Hz 001 - 361 1992-10-01 16:45:02 - 2002-07-12 14:28:19
    SARAL 1 Hz 001 - 035 2013-03-15 00:12:50 - 2016-07-04 11:04:37
    Topex 1 Hz 001 - 365 1992-09-25 05:24:42 - 2002-08-15 17:44:37
    Topex (Extended Mission) 1 Hz 368 - 481 2002-09-17 00:06:06 - 2005-10-08 23:39:55

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).

Acknowledgment

All products are computed based on altimetry missions operated by NASA/CNES (TOPEX, Jason-1), ESA (ERS-1/2, Envisat, Cryosat-2), USNavy/NOAA (GFO), CNES/NASA/Eumetsat/NOAA (Jason-2, Jason-3), ISRO/CNES (Saral), and EUMETSAT (Sentinel-3). The original data sets are disseminated by AVISO, ESA, NOAA, and PODAAC.