English UTF-8 Point of contact NOAA PolarWatch Roy Mendelssohn +1 831-420-3666 Voice 110 McAllister Way Santa Cruz CA 95062 USA roy.mendelssohn@noaa.gov ERDDAP administrator 3 Time 16870 86400.0 Sample 332 25000.0 Sample 316 25000.0 false Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily 2026-03-09T14:42:51.786-07:00 Creation polarwatch.noaa.gov nsidcG02202v4sh1day Originator NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information User Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher principal investigator, author, author, software developer, software developer, software developer This data set provides a passive microwave sea ice concentration climate data record (CDR) based on gridded brightness temperatures (TBs) from the Defense Meteorological Satellite Program (DMSP) series of passive microwave radiometers: the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), the Special Sensor Microwave Imager (SSM/I) and the Special Sensor Microwave Imager/Sounder (SSMIS). The sea ice concentration CDR is an estimate of sea ice concentration that is produced by combining concentration estimates from two algorithms developed at the NASA Goddard Space Flight Center (GSFC): the NASA Team algorithm and the Bootstrap algorithm. The individual algorithms are used to process and combine brightness temperatures at National Snow and Ice Data Center (NSIDC). This product is designed to provide a consistent time series of sea ice concentrations (the fraction, or percentage, of ocean area covered by sea ice) from November 1978 to the present which spans the coverage of several passive microwave instruments. The data are gridded on the NSIDC polar stereographic grid with 25 x 25 km grid cells, and are available in Network Common Data Format (NetCDF) file format. Each file contains a variable with the CDR concentration values as well as variables that hold the NASA Team and Bootstrap processed concentrations for reference. Variables containing standard deviation, quality flags, and projection information are also included. Data are available from NSIDC via FTP see https://nsidc.org/data/G02202/versions/4/. Data are also distributed via the PolarWatch ERDDAP at https://polarwatch.noaa.gov/erddap. Note that the data format available through PolarWatch is different from the NSIDC FTP NetCDF files. The PolarWatch data server stores projection information as global attributes (with the prefix grid_mapping) instead of as a variable; and the timestamp is served in different units (seconds since 1970). This project was supported in part by a grant from the NOAA Climate Data Record Program. Production of original NASA Team and Bootstrap algorithm estimates supported by the NASA Polar Distributed Active Archive Center. The sea ice concentration algorithms were developed by Donald J. Cavalieri, Josefino C. Comiso, Claire L. Parkinson, and others at the NASA Goddard Space Flight Center in Greenbelt, MD. Point of contact NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true NaN NaN NaN NaN 1978-10-25T00:00:00Z 2024-12-31T00:00:00Z algorithm area bellingshausen bootstrap center climate common concentration cryosphere daily data day defense deviation distribution dmsp earth estimated extent flag flags flight format fraction geographic goddard gsfc hemisphere ice ice distribution interpolation meteorological microwave nasa national network noaa noaa/nsidc nsidc ocean oceans passive polar processed program quality record ross satellite science sea snow source southern space spatial standard statistics status tdim team temporal version weddell Theme Ocean > Southern Ocean > Weddell Sea Ocean > Southern Ocean > Ross Sea Ocean > Southern Ocean > Bellingshausen Sea Ocean > Southern Ocean Geographic Region > Southern Hemisphere Geographic Region > Polar Earth Science > Oceans > Sea Ice > Ice Extent Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration Earth Science > Cryosphere > Sea Ice > Ice Extent Theme GCMD Science Keywords NOAA/NSIDC passive microwave sea ice concentration climate data record Theme time projection_y_coordinate projection_x_coordinate sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction status_flag interpolation_flag interpolation_flag Theme CF Standard Name Table v70 No constraints on data access or use NOAA/NSIDC passive microwave sea ice concentration climate data record Larger work citation Project Grid Unidata Common Data Model Grid Larger work citation Project Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily 2026-03-09T14:42:51.786-07:00 Creation Originator NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information User Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher principal investigator, author, author, software developer, software developer, software developer boundingExtent true NaN NaN NaN NaN 1978-10-25T00:00:00Z 2024-12-31T00:00:00Z ERDDAP griddap Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily 2026-03-09T14:42:51.786-07:00 Creation polarwatch.noaa.gov nsidcG02202v4sh1day Originator NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information User Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher principal investigator, author, author, software developer, software developer, software developer This data set provides a passive microwave sea ice concentration climate data record (CDR) based on gridded brightness temperatures (TBs) from the Defense Meteorological Satellite Program (DMSP) series of passive microwave radiometers: the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), the Special Sensor Microwave Imager (SSM/I) and the Special Sensor Microwave Imager/Sounder (SSMIS). The sea ice concentration CDR is an estimate of sea ice concentration that is produced by combining concentration estimates from two algorithms developed at the NASA Goddard Space Flight Center (GSFC): the NASA Team algorithm and the Bootstrap algorithm. The individual algorithms are used to process and combine brightness temperatures at National Snow and Ice Data Center (NSIDC). This product is designed to provide a consistent time series of sea ice concentrations (the fraction, or percentage, of ocean area covered by sea ice) from November 1978 to the present which spans the coverage of several passive microwave instruments. The data are gridded on the NSIDC polar stereographic grid with 25 x 25 km grid cells, and are available in Network Common Data Format (NetCDF) file format. Each file contains a variable with the CDR concentration values as well as variables that hold the NASA Team and Bootstrap processed concentrations for reference. Variables containing standard deviation, quality flags, and projection information are also included. Data are available from NSIDC via FTP see https://nsidc.org/data/G02202/versions/4/. Data are also distributed via the PolarWatch ERDDAP at https://polarwatch.noaa.gov/erddap. Note that the data format available through PolarWatch is different from the NSIDC FTP NetCDF files. The PolarWatch data server stores projection information as global attributes (with the prefix grid_mapping) instead of as a variable; and the timestamp is served in different units (seconds since 1970). This project was supported in part by a grant from the NOAA Climate Data Record Program. Production of original NASA Team and Bootstrap algorithm estimates supported by the NASA Polar Distributed Active Archive Center. The sea ice concentration algorithms were developed by Donald J. Cavalieri, Josefino C. Comiso, Claire L. Parkinson, and others at the NASA Goddard Space Flight Center in Greenbelt, MD. Point of contact NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true NaN NaN NaN NaN 1978-10-25T00:00:00Z 2024-12-31T00:00:00Z algorithm area bellingshausen bootstrap center climate common concentration cryosphere daily data day defense deviation distribution dmsp earth estimated extent flag flags flight format fraction geographic goddard gsfc hemisphere ice ice distribution interpolation meteorological microwave nasa national network noaa noaa/nsidc nsidc ocean oceans passive polar processed program quality record ross satellite science sea snow source southern space spatial standard statistics status tdim team temporal version weddell Theme Ocean > Southern Ocean > Weddell Sea Ocean > Southern Ocean > Ross Sea Ocean > Southern Ocean > Bellingshausen Sea Ocean > Southern Ocean Geographic Region > Southern Hemisphere Geographic Region > Polar Earth Science > Oceans > Sea Ice > Ice Extent Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration Earth Science > Cryosphere > Sea Ice > Ice Extent Theme GCMD Science Keywords NOAA/NSIDC passive microwave sea ice concentration climate data record Theme time projection_y_coordinate projection_x_coordinate sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction status_flag interpolation_flag interpolation_flag Theme CF Standard Name Table v70 No constraints on data access or use NOAA/NSIDC passive microwave sea ice concentration climate data record Larger work citation Project Grid Unidata Common Data Model Grid Larger work citation Project ERDDAPgriddapDatasetQueryAndAccess nsidcG02202v4sh1day ERDDAP:griddap ERDDAP-griddap ERDDAP's griddap service (a flavor of OPeNDAP) for gridded data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for different purposes. Download Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily 2026-03-09T14:42:51.786-07:00 Creation Originator NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information User Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher principal investigator, author, author, software developer, software developer, software developer boundingExtent true NaN NaN NaN NaN 1978-10-25T00:00:00Z 2024-12-31T00:00:00Z OPeNDAP Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily 2026-03-09T14:42:51.786-07:00 Creation polarwatch.noaa.gov nsidcG02202v4sh1day Originator NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information User Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher principal investigator, author, author, software developer, software developer, software developer This data set provides a passive microwave sea ice concentration climate data record (CDR) based on gridded brightness temperatures (TBs) from the Defense Meteorological Satellite Program (DMSP) series of passive microwave radiometers: the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), the Special Sensor Microwave Imager (SSM/I) and the Special Sensor Microwave Imager/Sounder (SSMIS). The sea ice concentration CDR is an estimate of sea ice concentration that is produced by combining concentration estimates from two algorithms developed at the NASA Goddard Space Flight Center (GSFC): the NASA Team algorithm and the Bootstrap algorithm. The individual algorithms are used to process and combine brightness temperatures at National Snow and Ice Data Center (NSIDC). This product is designed to provide a consistent time series of sea ice concentrations (the fraction, or percentage, of ocean area covered by sea ice) from November 1978 to the present which spans the coverage of several passive microwave instruments. The data are gridded on the NSIDC polar stereographic grid with 25 x 25 km grid cells, and are available in Network Common Data Format (NetCDF) file format. Each file contains a variable with the CDR concentration values as well as variables that hold the NASA Team and Bootstrap processed concentrations for reference. Variables containing standard deviation, quality flags, and projection information are also included. Data are available from NSIDC via FTP see https://nsidc.org/data/G02202/versions/4/. Data are also distributed via the PolarWatch ERDDAP at https://polarwatch.noaa.gov/erddap. Note that the data format available through PolarWatch is different from the NSIDC FTP NetCDF files. The PolarWatch data server stores projection information as global attributes (with the prefix grid_mapping) instead of as a variable; and the timestamp is served in different units (seconds since 1970). This project was supported in part by a grant from the NOAA Climate Data Record Program. Production of original NASA Team and Bootstrap algorithm estimates supported by the NASA Polar Distributed Active Archive Center. The sea ice concentration algorithms were developed by Donald J. Cavalieri, Josefino C. Comiso, Claire L. Parkinson, and others at the NASA Goddard Space Flight Center in Greenbelt, MD. Point of contact NSIDC nsidc@nsidc.org information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true NaN NaN NaN NaN 1978-10-25T00:00:00Z 2024-12-31T00:00:00Z algorithm area bellingshausen bootstrap center climate common concentration cryosphere daily data day defense deviation distribution dmsp earth estimated extent flag flags flight format fraction geographic goddard gsfc hemisphere ice ice distribution interpolation meteorological microwave nasa national network noaa noaa/nsidc nsidc ocean oceans passive polar processed program quality record ross satellite science sea snow source southern space spatial standard statistics status tdim team temporal version weddell Theme Ocean > Southern Ocean > Weddell Sea Ocean > Southern Ocean > Ross Sea Ocean > Southern Ocean > Bellingshausen Sea Ocean > Southern Ocean Geographic Region > Southern Hemisphere Geographic Region > Polar Earth Science > Oceans > Sea Ice > Ice Extent Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration Earth Science > Cryosphere > Sea Ice > Ice Extent Theme GCMD Science Keywords NOAA/NSIDC passive microwave sea ice concentration climate data record Theme time projection_y_coordinate projection_x_coordinate sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction sea_ice_area_fraction status_flag interpolation_flag interpolation_flag Theme CF Standard Name Table v70 No constraints on data access or use NOAA/NSIDC passive microwave sea ice concentration climate data record Larger work citation Project Grid Unidata Common Data Model Grid Larger work citation Project OPeNDAPDatasetQueryAndAccess nsidcG02202v4sh1day OPeNDAP:OPeNDAP OPeNDAP An OPeNDAP service for tabular (sequence) data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes Download Physical measurement cdr_seaice_conc float NOAA/NSIDC Climate Data Record of Passive Microwave Daily Southern Hemisphere Sea Ice Concentration nsidc_bt_seaice_conc float Passive Microwave Daily Southern Hemisphere Sea Ice Concentration by Bootstrap algorithm processed by NSIDC nsidc_nt_seaice_conc float Passive Microwave Daily Southern Hemisphere Sea Ice Concentration by NASA Team algorithm processed by NSIDC qa_of_cdr_seaice_conc ubyte Passive Microwave Daily Southern Hemisphere Sea Ice Concentration QC flags spatial_interpolation_flag ubyte Passive Microwave Daily Southern Hemisphere Sea Ice Concentration spatial interpolation flags stdev_of_cdr_seaice_conc float Passive Microwave Daily Southern Hemisphere Sea Ice Concentration Source Estimated Standard Deviation temporal_interpolation_flag ubyte Passive Microwave Daily Southern Hemisphere Sea Ice Concentration temporal interpolation flags OPeNDAP DAP/2.0 Distributor NOAA PolarWatch Roy Mendelssohn +1 831-420-3666 Voice 110 McAllister Way Santa Cruz CA 95062 USA roy.mendelssohn@noaa.gov ERDDAP administrator OPeNDAP DAP/2.0 nsidcG02202v4sh1day.html order Data Subset Form ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file types. Download nsidcG02202v4sh1day.graph order Make-A-Graph Form ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data. Download This record was created from dataset metadata by ERDDAP Version 2.29.0 Dataset dataset Service service