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Sea Level Anomalies (SLA)

Sea Level Anomalies based on Multi-Mission Satellite Altimetry
Sea Level Anomalies based on Multi-Mission Satellite Altimetry

Sea Level Anomalies (SLA) are provided along-track for all available satellite altimeter missions. They describe the difference between the actual sea surface height (SSH) and a mean sea surface height (MSSH). All measurements are already corrected by the most actual geophysical corrections (e.g. tides and atmospheric delays). Moreover, as the data of all 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 SLA of any mission in order to improve the spatial and temporal resolution.

Available Dataset(s)

Available version(s) of the product "Sea Level Anomalies (SLA)" in OpenADB.

Sea Level Anomalies (SLA)

Version 33 (Mean sea surface: CLS11)
  • Mission Freq. Cycles Dates
    Envisat 1 Hz 008 - 094 2002-07-22 21:39:36 - 2010-10-19 02:56:07
    Envisat (Extended Mission) 1 Hz 096 - 113 2010-10-27 23:59:26 - 2012-04-04 00:00:00
    ERS-1 (Phase C) 1 Hz 087 - 101 1992-09-01 11:59:33 - 1993-12-23 19:43:02
    ERS-1 (Phase D) 1 Hz 103 - 138 1993-12-24 22:32:23 - 1994-04-10 16:23:57
    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 21:59:26
    ERS-2 1 Hz 000 - 085 1995-05-14 01:34:00 - 2003-07-02 07:10:05
    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-1 (Geodetic Mission) 1 Hz 500 - 537 2012-05-07 16:04:39 - 2013-06-21 00:51:27
    Jason-2 1 Hz 001 - 303 2008-07-12 01:25:39 - 2016-10-02 11:45:54
    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
    SARAL (Drifting Phase) 1 Hz 100 - 106 2016-07-04 12:59:11 - 2017-03-06 13:52:20
    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 SLA 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 SLA, 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
sla Sea Level Anomalies
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 SLA were produced by DGFI-TUM based on multi-mission altimeter data and distributed via OpenADB (Schwatke et al, 2010)."

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.