Dataset: DT merged two satellites Global Ocean Gridded SSALTO/DUACS Sea Surface Height L4 product and derived variables#
Dataset identifier: c3s_obs-sl_glo_phy-ssh_my_twosat-l4-duacs-0.25deg_P1D
Data store: cmems
How to open this dataset in AVL JupyterLab
cmems_store = new_data_store('cmems')
ds = cmems_store.open_data('c3s_obs-sl_glo_phy-ssh_my_twosat-l4-duacs-0.25deg_P1D')
Bounding box map#
cmems_store = new_data_store('cmems')
ds = cmems_store.open_data('c3s_obs-sl_glo_phy-ssh_my_twosat-l4-duacs-0.25deg_P1D')
Map tiles and data from OpenStreetMap, under the ODbL.
Basic information#
| Parameter | Value |
|---|---|
| Bounding box longitude (°) | -180 to 180 |
| Bounding box latitude (°) | -90 to 90 |
| Time range | 1993-01-01 to 2022-06-23 |
| Time period | 1D |
Click here for full dataset metadata.
Variable list#
Click on a variable name to jump to the variable’s full metadata.
| Variable | Long name | Units |
|---|---|---|
| adt | Absolute dynamic topography | m |
| err_sla | Formal mapping error | m |
| err_ugosa | Formal mapping error on zonal geostrophic velocity anomalies | m/s |
| err_vgosa | Formal mapping error on meridional geostrophic velocity anomalies | m/s |
| flag_ice | Ice Flag for a 15% criterion of ice concentration | [none] |
| lat_bnds | [none] | degrees_north |
| lon_bnds | [none] | degrees_east |
| sla | Sea level anomaly | m |
| tpa_correction | TOPEX-A instrumental drift correction derived from altimetry and tide gauges global comparisons (WCRP Sea Level Budget Group, 2018) | m |
| ugos | Absolute geostrophic velocity: zonal component | m/s |
| ugosa | Geostrophic velocity anomalies: zonal component | m/s |
| vgos | Absolute geostrophic velocity: meridian component | m/s |
| vgosa | Geostrophic velocity anomalies: meridian component | m/s |
Full variable metadata#
adt#
| Field | Value |
|---|---|
| comment | The absolute dynamic topography is the sea surface height above geoid; the adt is obtained as follows: adt=sla+mdt where mdt is the mean dynamic topography; see the product user manual for details |
| grid_mapping | crs |
| long_name | Absolute dynamic topography |
| standard_name | sea_surface_height_above_geoid |
| units | m |
crs#
| Field | Value |
|---|---|
| comment | This is a container variable that describes the grid_mapping used by the data in this file. This variable does not contain any data; only information about the geographic coordinate system. |
| inverse_flattening | 298.257 |
| grid_mapping_name | latitude_longitude |
| semi_major_axis | 6378136.3 |
| _CoordinateTransformType | Projection |
| _CoordinateAxisTypes | GeoX GeoY |
err_sla#
| Field | Value |
|---|---|
| comment | The formal mapping error represents a purely theoretical mapping error. It mainly traduces errors induced by the constellation sampling capability and consistency with the spatial/temporal scales considered, as described in Le Traon et al (1998) or Ducet et al (2000) |
| grid_mapping | crs |
| long_name | Formal mapping error |
| standard_name | sea_surface_height_above_sea_level standard_error |
| units | m |
err_ugosa#
| Field | Value |
|---|---|
| comment | The formal mapping error represents a purely theoretical mapping error. It mainly traduces errors induced by the constellation sampling capability and consistency with the spatial/temporal scales considered, as described in Le Traon et al (1998) or Ducet et al (2000) |
| grid_mapping | crs |
| long_name | Formal mapping error on zonal geostrophic velocity anomalies |
| standard_name | surface_geostrophic_eastward_sea_water_velocity_assuming_sea_level_for_geoid standard_error |
| units | m/s |
err_vgosa#
| Field | Value |
|---|---|
| comment | The formal mapping error represents a purely theoretical mapping error. It mainly traduces errors induced by the constellation sampling capability and consistency with the spatial/temporal scales considered, as described in Le Traon et al (1998) or Ducet et al (2000) |
| grid_mapping | crs |
| long_name | Formal mapping error on meridional geostrophic velocity anomalies |
| standard_name | surface_geostrophic_northward_sea_water_velocity_assuming_sea_level_for_geoid standard_error |
| units | m/s |
flag_ice#
| Field | Value |
|---|---|
| comment | Ice Flag based on CDR OSI SAF products until 2016 (OSI-450), Interim products from 2016 (OSI-430-b) (Lavergne et al., 2019). The flag corresponds to the 15% sea ice concentration. |
| flag_meanings | data_on_sea data_on_ice |
| flag_values | 0, 1 |
| grid_mapping | crs |
| long_name | Ice Flag for a 15% criterion of ice concentration |
| standard_name | status_flag |
lat_bnds#
| Field | Value |
|---|---|
| comment | latitude values at the north and south bounds of each pixel. |
| units | degrees_north |
lon_bnds#
| Field | Value |
|---|---|
| comment | longitude values at the west and east bounds of each pixel. |
| units | degrees_east |
sla#
| Field | Value |
|---|---|
| ancillary_variables | err_sla |
| comment | The sea level anomaly is the sea surface height above mean sea surface; it is referenced to the [1993, 2012] period; see the product user manual for details |
| grid_mapping | crs |
| long_name | Sea level anomaly |
| standard_name | sea_surface_height_above_sea_level |
| units | m |
tpa_correction#
| Field | Value |
|---|---|
| comment | This variable can be added to the gridded SLA to correct for the observed instrumental drift during the lifetime of the TOPEX-A mission (the correction is null after this period). This is a global correction to be added a posteriori (and not before) on the global mean sea level estimate derived from the gridded sea level map. It can be applied at regional or local scale as a best estimate (better than no correction, since the regional variation of the instrumental drift is unknown). See product manual for more details. |
| long_name | TOPEX-A instrumental drift correction derived from altimetry and tide gauges global comparisons (WCRP Sea Level Budget Group, 2018) |
| standard_name | sea_surface_height_above_sea_level |
| units | m |
ugos#
| Field | Value |
|---|---|
| grid_mapping | crs |
| long_name | Absolute geostrophic velocity: zonal component |
| standard_name | surface_geostrophic_eastward_sea_water_velocity |
| units | m/s |
ugosa#
| Field | Value |
|---|---|
| ancillary_variables | err_ugosa |
| comment | The geostrophic velocity anomalies are referenced to the [1993, 2012] period |
| grid_mapping | crs |
| long_name | Geostrophic velocity anomalies: zonal component |
| standard_name | surface_geostrophic_eastward_sea_water_velocity_assuming_sea_level_for_geoid |
| units | m/s |
vgos#
| Field | Value |
|---|---|
| grid_mapping | crs |
| long_name | Absolute geostrophic velocity: meridian component |
| standard_name | surface_geostrophic_northward_sea_water_velocity |
| units | m/s |
vgosa#
| Field | Value |
|---|---|
| ancillary_variables | err_vgosa |
| comment | The geostrophic velocity anomalies are referenced to the [1993, 2012] period |
| grid_mapping | crs |
| long_name | Geostrophic velocity anomalies: meridian component |
| standard_name | surface_geostrophic_northward_sea_water_velocity_assuming_sea_level_for_geoid |
| units | m/s |
Full dataset metadata#
| Field | Value |
|---|---|
| Conventions | CF-1.6 |
| Metadata_Conventions | Unidata Dataset Discovery v1.0 |
| cdm_data_type | Grid |
| comment | Sea Surface Height measured by Altimetry and derived variables |
| contact | http://climate.copernicus.eu/c3s-user-service-desk |
| creator_email | http://climate.copernicus.eu/c3s-user-service-desk |
| creator_name | Copernicus Climate Change Service (C3S) |
| creator_url | http://climate.copernicus.eu |
| date_created | 2023-01-03T22:04:20Z |
| date_issued | 2023-01-03T22:04:20Z |
| date_modified | 2023-01-03T22:04:20Z |
| geospatial_lat_max | 89.875 |
| geospatial_lat_min | -89.875 |
| geospatial_lat_resolution | 0.25 |
| geospatial_lat_units | degrees_north |
| geospatial_lon_max | 179.875 |
| geospatial_lon_min | -179.875 |
| geospatial_lon_resolution | 0.25 |
| geospatial_lon_units | degrees_east |
| geospatial_vertical_max | 0.0 |
| geospatial_vertical_min | 0.0 |
| geospatial_vertical_positive | down |
| geospatial_vertical_resolution | point |
| geospatial_vertical_units | m |
| history | 2023-01-03 22:04:21Z: Creation |
| institution | CLS, CNES |
| keywords | Oceans > Ocean Topography > Sea Surface Height |
| keywords_vocabulary | NetCDF COARDS Climate and Forecast Standard Names |
| license | http://climate.copernicus.eu/c3s-user-service-desk |
| platform | Sentinel-3A, Sentinel-6A |
| processing_level | L4 |
| product_version | vDec2021 |
| project | Copernicus Climate Change Service (C3S) |
| references | http://climate.copernicus.eu |
| software_version | 7.1_DUACS_DT2021_baseline |
| source | Altimetry measurements |
| ssalto_duacs_comment | The reference mission used for the altimeter inter-calibration processing is Topex/Poseidon between 1993-01-01 and 2002-04-23, Jason-1 between 2002-04-24 and 2008-10-18, OSTM/Jason-2 between 2008-10-19 and 2016-06-25, Jason-3 between 2016-06-25 and 2022-02-09, and Sentinel-6A from 2022-02-10. |
| standard_name_vocabulary | NetCDF Climate and Forecast (CF) Metadata Convention Standard Name Table v37 |
| summary | SSALTO/DUACS Delayed-Time Level-4 sea surface height and derived variables measured by multi-satellite altimetry observations over Global Ocean. |
| time_coverage_duration | P1D |
| time_coverage_end | 2022-06-23T12:00:00Z |
| time_coverage_resolution | P1D |
| time_coverage_start | 2022-06-22T12:00:00Z |
| title | DT merged two satellites Global Ocean Gridded SSALTO/DUACS Sea Surface Height L4 product and derived variables |
| _CoordSysBuilder | ucar.nc2.dataset.conv.CF1Convention |