This website uses cookies. By continuing to use this website you are agreeing to our use of cookies. 

Dataset

 

ESA Sea Level Climate Change Initiative (Sea_Level_cci): Altimeter along-track high resolution sea level anomalies in some coastal regions from ENVISAT (2002-2010) and SARAL (2013-2016) satellite altimetry, v1.1

Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2021-12-09
Download Stats: last 12 months

Abstract

This dataset contains along-track sea level anomalies derived from satellite altimetry. Altimeter along-track sea level measurements from the RA2 instrument on ENVISAT and the Altika instrument on SARAL satellite missions have been processed to produce high resolution (20 Hz, corresponding to an along-track distance of ~300m) sea level anomalies, in order to provide long-term homogeneous sea level time series as close to the coast as possible in six different coastal regions (North-East Atlantic, Mediterranean Sea, Western Africa, North Indian Ocean, South-East Asia and Australia).

The product benefits from the spatial resolution provided by high-rate data, the Adaptive Leading Edge Subwaveform Retracker (ALES) and the post-processing strategy of the along-track (X-TRACK) algorithm, both developed for the processing of coastal altimetry data, as well as the best possible set of geophysical corrections.

The main objective of this product is to provide accurate altimeter Sea Level Anomalies (SLA) time series as close to the coast as possible in order to assess whether the coastal sea level trends experienced at the coast are similar to the observed sea level trends in the open ocean and to determine the causes of the potential discrepancies.

The Envisat and SARAL/AltiKa missions have the same ground track but the temporal gap between both missions prevents from computing reliable trends during the total period between both missions.

This dataset has been produced by the Climate Change Initiative Coastal Sea Level team, within the extension phase of the European Sapce Agency (ESA) Climate Change Initiative.

Citable as:  The Climate Change Coastal sea level team (2021): ESA Sea Level Climate Change Initiative (Sea_Level_cci): Altimeter along-track high resolution sea level anomalies in some coastal regions from ENVISAT (2002-2010) and SARAL (2013-2016) satellite altimetry, v1.1. NERC EDS Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/2e3a3408af2f4e918458c09d4e5f7460
Abbreviation: Not defined
Keywords: ESA CCI, SLA

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/esacci_sealevel_terms_and_conditions.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

This dataset has been produced by the Climate Change Initiative Coastal Sea Level team within the extension phase of the European Space Agency (ESA) Climate Change Initiative. A copy has been transferred to CEDA as part of the ESA CCI Open Data Portal project.

Data Quality:
The SL_cci+ XTRACK/ALES product (V1.1) has been produced based on the L2 altimeter algorithms recommended by the SL_cci
File Format:
Data are in NetCDF format

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

Radar Altimeter 2 (RA-2) Deployed on: Envisat
AltiKa Deployed on: SARAL (Satellite with ARGOS and AltiKa)

Computation Element: 1

Title Computation of altimeter coastal sea level anomalies based on the XTRACK/ALES processing
Abstract The altimeter coastal sea level anomalies products are based on the XTRACK/ALES processing. The products benefit from the spatial resolution provided by high-rate data, the Adaptive Leading Edge Subwaveform Retracker (ALES) and the post-processing strategy of the along-track (X-TRACK) algorithm, both developed for the processing of coastal altimetry data, as well as the best possible set of geophysical corrections. For details of the processing see the Algorithm Theoretical Baseline Document in the linked documentation.
Input Description None
Output Description None
Software Reference None
Output Description None
  • long_name: 20Hz SLA quality flag
  • var_id: qual_flag
  • names: 20Hz SLA quality flag
  • units: count
  • var_id: cycle
  • long_name: Cycle number
  • names: Cycle number
  • units: m
  • long_name: Distance to nearest coastline
  • var_id: dist_to_coast_gshhs
  • names: Distance to nearest coastline
  • units: m
  • long_name: Global Dynamic Atmospheric Corrections
  • var_id: dynamic_atmospheric_correction
  • names: Global Dynamic Atmospheric Corrections
  • units: m
  • var_id: ocean_tide
  • long_name: Global FES14 tide correction
  • standard_name: sea_surface_height_amplitude_due_to_geocentric_ocean_tide
  • names: Global FES14 tide correction, sea_surface_height_amplitude_due_to_geocentric_ocean_tide
  • units: degrees_north
  • var_id: lat
  • long_name: Latitude
  • names: Latitude
  • units: degrees_east
  • var_id: lon
  • long_name: Longitude
  • names: Longitude
  • var_id: time
  • long_name: Time of measurement
  • names: Time of measurement
  • units: m
  • var_id: mean_sea_surface
  • long_name: X-TRACK/ALES Mean Sea Surface
  • names: X-TRACK/ALES Mean Sea Surface
  • units: m
  • var_id: sla
  • standard_name: sea_surface_height_above_mean_sea_level
  • long_name: X-TRACK/ALES Sea Level Anomalies
  • names: sea_surface_height_above_mean_sea_level, X-TRACK/ALES Sea Level Anomalies
  • units: m
  • long_name: mean dynamic topography
  • standard_name: mean_dynamic_topography
  • var_id: mdt_cnes_cls18
  • names: mean dynamic topography, mean_dynamic_topography

Co-ordinate Variables

Coverage
Temporal Range
Start time:
2002-09-30T00:00:00
End time:
2016-06-16T23:59:59
Geographic Extent

 
60.0000°
 
-30.0000°
 
160.0000°
 
-45.0000°