d96406df-ec66-45bb-979a-4338061ad289 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2022-04-29 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 UCL CPOM CryoSat2 Polar Ocean Significant Wave Height 2011-2019 2022-04-29 creation 2022-04-29 revision 2022-04-29 publication 2022-04-29 released 1.0 https://doi.org/10.5285/d96406df-ec66-45bb-979a-4338061ad289 doi GB/NERC/BAS/PDC/01643 https://data.bas.ac.uk/ NE/R000654/1 award Please cite this item as: Heorton, H. (2022). UCL CPOM CryoSat2 Polar Ocean Significant Wave Height 2011-2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/d96406df-ec66-45bb-979a-4338061ad289 We present the significant ocean surface wave heights in the Arctic and Southern Oceans from CryoSat-2 data. We use a semi-analytical model for an idealised synthetic aperture satellite radar or pulse-limited radar altimeter echo power. We develop a processing methodology that specifically considers both the Synthetic Aperture and Pulse Limited modes of the radar that change close to the sea ice edge within the Arctic Ocean. All CryoSat-2 echoes to date were matched by our idealised echo revealing wave heights over the period 2011-2019. Our retrieved data were contrasted to existing processing of CryoSat-2 data and wave model data, showing the improved fidelity and accuracy of the semi-analytical echo power model and the newly developed processing methods. We contrasted our data to in situ wave buoy measurements, showing improved data retrievals in seasonal sea ice covered seas. We have shown the importance of directly considering the correct satellite mode of operation in the Arctic Ocean where SAR is the dominant operating mode. Our new data are of specific use for wave model validation close to the sea ice edge and is available at the link in the data availability statement. NERC NE/R000654/1 Towards a marginal Arctic sea ice cover. No credit. completed Heorton, Harold University College London Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Oceans > Ocean Waves > Significant Wave Height theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Antarctic CryoSat2 Ocean waves theme Arctic Antarctica place Oceanographic geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data released under Open Government Licence V3.0: otherRestrictions None url url largerWorkCitation doi doi crossReference doi doi crossReference url url dependency url url crossReference textTable eng utf8 environment oceans -180.0 180.0 60.0 90.0 2011-01-01 2019-05-31 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor application/x-hdf application/netcdf bytes 258369126 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d96406df-ec66-45bb-979a-4338061ad289 WWW:LINK-1.0-http--link Get Data Download data download bytes 258369126 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d96406df-ec66-45bb-979a-4338061ad289 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: We take CryoSat2 Level 1B radar data (Baseline D was used at the time of processing, though other NetCDF file based product releases are applicable). These records are from 2 satellite modes, LRM and SAR. We only take data either above 60N or below 50S. The data is first filtered by using pulse peakiness and echo standard deviation to leave only data for the open ocean surface. The remaining 20Hz satellite echos are down sampled to 1Hz averaged records. The 1Hz averaged echoes are then analysed by our semi-analytical physical retracker to create the closest matching idealised radar echo. A different idealised echo is used for the different instrument modes. The parameters used to create the idealised echo represent the significant wave height of the ocean surface. The individual wave height data records are saved as satellite tracks similar to the initial CryoSat2 files. We then create gridded data product for easier use. This collects all satellite records onto a daily 100km polar stereographic projection. Prior to gridding we filter the data to those with acceptable retracker fit, the difference between the idealised and recorded radar echo. A wave height dependent LRM to SAR mode offset was apparent and this bias was analysed, parameterised and removed to make the gridded data. Data collection: CryoSat2 LRM and SAR mode radar altimeter. Data quality: The retracker fit metric is supplied alongside the individual data records to indicate the accuracy of the retrieved data. For the gridded data product, data accuracy filtering and mode debiasing was performed. The gridded data is give daily with many empty grid cells where the satellite did not cross for that day. These data celss have nan values. Data is supplied over all locations where a record was retrieved. This can be over sea ice. We supply a sea ice mask within the file to indicated which data points are for the open ocean. We provide data for all open ocean surfaces as defined by the spatial coverage. We give particular attention for data filtering to avoid sea ice contaminated data retrievals, but to also obtain data as close to the sea ice edge as possible. We analyse NSIDC sea ice concentration data to compare our data to the sea ice extent . asNeeded completed