| Conventions: | CF-1.6, ACDD-1.3 |
| title: | AVHRR Pathfinder Version 5.3 L3-Collated (L3C) sea surface temperature |
| summary: | This netCDF-4 file contains sea surface temperature (SST) data produced as part of the AVHRR Pathfinder SST Project. These data were created using Version 5.3 of the Pathfinder algorithm and the file is nearly but not completely compliant with the GHRSST Data Specifications V2.0 (GDS2). The sses_bias and sses_standard_deviation variables are empty. Full compliance with GDS2 specifications will be achieved in the future Pathfinder Version 6. These data were created by the NOAA National Centers for Environmental Information (NCEI). |
| references: | http://pathfinder.nodc.noaa.gov and Casey, K.S., T.B. Brandon, P. Cornillon, and R. Evans: The Past, Present and Future of the AVHRR Pathfinder SST Program, in Oceanography from Space: Revisited, eds. V. Barale, J.F.R. Gower, and L. Alberotanza, Springer, 2010. DOI: 10.1007/978-90-481-8681-5_16. |
| institution: | NCEI |
| history: | smigen_both ifile=1996006.b4kd3-pf53ap-n14-sst.hdf ofile=1996006.i4kd3-pf53ap-n14-sst.hdf prod=sst datamin=-3.0 datamax=40.0 precision=I projection=RECT resolution=4km gap_fill=2 ; /srv/disk1t/PFV5.3CONV/bin/Converter/hdf2nc_PFV53_L3C.x -v /srv/disk1t/PFV5.3CONV/Data_PFV53/PFV53_HDF_L3C/1996/1996006.i4kd3-pf53ap-n14-sst.hdf |
| comment: | SST from AVHRR Pathfinder |
| license: | These data are available for use without restriction. |
| id: | AVHRR_Pathfinder-NCEI-L3C-v5.3 |
| naming_authority: | org.ghrsst |
| product_version: | PFV5.3 |
| uuid: | 072C9CC0-9CAF-4041-BBFA-7766396FA9AA |
| gds_version_id: | 2.0 |
| netcdf_version_id: | 4.1.2 |
| date_created: | 20160513T015604Z |
| date_modified: | 20160513T015604Z |
| date_issued: | 20160301T000000Z |
| date_metadata_modified: | 20160125T000000Z |
| file_quality_level: | 3 |
| spatial_resolution: | 0.0416667 degree |
| geospatial_lat_units: | degrees north |
| geospatial_lat_resolution: | 0.0416667014 |
| geospatial_lon_units: | degrees east |
| geospatial_lon_resolution: | 0.0416667014 |
| geospatial_bounds: | -180.0000 -90.0000, 180.0000 90.0000 |
| geospatial_bounds_crs: | EPSG:4326 |
| geospatial_lon_min: | -180.000000 |
| geospatial_lon_max: | 180.000000 |
| geospatial_lat_min: | -90.0000000 |
| geospatial_lat_max: | 90.0000000 |
| northernmost_latitude: | 90.0000000 |
| southernmost_latitude: | -90.0000000 |
| easternmost_longitude: | 180.000000 |
| westernmost_longitude: | -180.000000 |
| principal_year_day_for_collated_orbits: | 1996006 |
| time_coverage_duration: | P1D |
| time_coverage_resolution: | P1D |
| start_time: | 19960105T211222Z |
| time_coverage_start: | 19960105T211222Z |
| stop_time: | 19960107T062223Z |
| time_coverage_end: | 19960107T062223Z |
| source: | AVHRR_GAC-CLASS-L1B-NOAA_14-v1 |
| platform: | NOAA-14 |
| instrument: | AVHRR-2 |
| sensor: | AVHRR-2 |
| sea_name: | World-Wide Distribution |
| day_or_night: | Day |
| orbit_node: | Ascending |
| keywords: | Oceans > Ocean Temperature > Sea Surface Temperature |
| acknowledgement: | Please acknowledge the use of these data with the following statement: These data were provided by GHRSST and the NOAA National Centers for Environmental Information (NCEI). This project was supported in part by a grant from the NOAA Climate Data Record (CDR) Program for satellites. |
| creator_name: | Kenneth S. Casey |
| creator_email: | Kenneth.Casey@noaa.gov |
| creator_url: | http://pathfinder.nodc.noaa.gov |
| creator_type: | person |
| creator_institution: | US DOC; NOAA; National Environmental Satellite Data and Information Service; National Centers for Environmental Information |
| contributor_name: | Robert Evans |
| contributor_role: | Principal Investigator |
| project: | Group for High Resolution Sea Surface Temperature |
| publisher_name: | GHRSST Project Office |
| publisher_email: | ghrsst-po@nceo.ac.uk |
| publisher_url: | http://www.ghrsst.org |
| publisher_type: | group |
| processing_level: | L3C |
| cdm_data_type: | Grid |
| ncei_template_version: | NCEI_NetCDF_Grid_Template_v2.0 |
| cdr_variable: | sea_surface_temperature |
| keywords_vocabulary: | NASA/Global Change Master Directory (GCMD) Science Keywords v8.4 |
| standard_name_vocabulary: | Climate and Forecast (CF) Standard Name Table (Version 29, 08 July 2015) |
| platform_vocabulary: | NASA Global Change Master Directory (GCMD) Science Keywords v8.4 |
| instrument_vocabulary: | NASA Global Change Master Directory (GCMD) Science Keywords v8.4 |
| metadata_link: | http://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:AVHRR_Pathfinder-NCEI-L3C-v5.3 |
| program: | NOAA Climate Data Record (CDR) Program for satellites |
| cdr_program: | NOAA Climate Data Record Program for satellites |
| cdr_id: | gov.noaa.ncdc:C00983 |
| Unlimited_Dimension: | time |
| time: | Array of 32 bit Integers [time = 0..0] standard_name: time long_name: reference time of SST file units: seconds since 1981-01-01 00:00:00 axis: T comment: This is the reference time of the SST file. Add sst_dtime to this value to get pixel-by-pixel times. calendar: gregorian |
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| time_bounds: | Array of 32 bit Integers [time = 0..0][nv = 0..1] long_name: time bounds units: seconds since 1981-01-01 00:00:00 comment: time bounds for each time value calendar: gregorian |
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| lat: | Array of 32 bit Reals [lat = 0..4319] standard_name: latitude long_name: latitude units: degrees_north reference_datum: Geographical coordinates, WGS84 datum axis: Y valid_min: -90.00000000000000 valid_max: 90.00000000000000 |
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| lat_bounds: | Array of 32 bit Reals [lat = 0..4319][nv = 0..1] long_name: latitude bounds units: degrees_north comment: latitude values at the north and south bounds of each grid point |
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| lon: | Array of 32 bit Reals [lon = 0..8639] standard_name: longitude long_name: longitude units: degrees_east reference_datum: Geographical coordinates, WGS84 datum axis: X valid_min: -180.0000000000000 valid_max: 180.0000000000000 |
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| lon_bounds: | Array of 32 bit Reals [lon = 0..8639][nv = 0..1] long_name: longitude bounds units: degrees_east comment: longitude values at the west and east bounds of each grid point |
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| crs: | 32 bit Integer long_name: coordinate reference system grid_mapping_name: latitude_longitude semi_major_axis: 6378137.000000000 inverse_flattening: 298.2572235630000 epsg_code: EPSG:4326 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. |
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| sea_surface_temperature: | Grid standard_name: sea_surface_skin_temperature long_name: NOAA Climate Data Record of sea surface skin temperature coverage_content_type: physicalMeasurement grid_mapping: crs units: kelvin add_offset: 273.1500000000000 scale_factor: 0.01000000000000000 valid_min: -180 valid_max: 4500 _FillValue: -32768 ancillary_variables: quality_level pathfinder_quality_level l2p_flags source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: Skin temperature of the ocean
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| sst_dtime: | Grid long_name: time difference from reference time coverage_content_type: auxiliaryInformation grid_mapping: crs units: seconds add_offset: 0 scale_factor: 1 valid_min: -2147483647 valid_max: 2147483647 _FillValue: -2147483648 source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: Time plus sst_dtime gives seconds after 1981-01-01 00:00:00. Note: in PFV5.3 this sst_dtime is empty. PFV6 will contain the correct sst_dtime values.
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| sses_bias: | Grid long_name: SSES bias estimate coverage_content_type: auxiliaryInformation grid_mapping: crs units: kelvin add_offset: 0.000000000000000 scale_factor: 0.02000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: Bias estimate derived using the techniques described at https://www.ghrsst.org/ghrsst/tags-and-wgs/stval-wg/sses-description-of-schemes/. Note: in PFV5.3 this sses_bias is empty. PFV6 will contain the correct sses_bias values.
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| sses_standard_deviation: | Grid long_name: SSES standard deviation coverage_content_type: auxiliaryInformation grid_mapping: crs units: kelvin add_offset: 2.540000000000000 scale_factor: 0.02000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: Standard deviation estimate derived using the techniques described at https://www.ghrsst.org/ghrsst/tags-and-wgs/stval-wg/sses-description-of-schemes/. Note: in PFV5.3 this sses_standard_deviation is empty. PFV6 will contain the correct sses_standard_deviation values.
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| dt_analysis: | Grid long_name: deviation from last SST analysis coverage_content_type: auxiliaryInformation grid_mapping: crs units: kelvin add_offset: 0.000000000000000 scale_factor: 0.1000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 source: NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST) platform: NOAA-14 reference: AVHRR_OI, with inland values populated from AVHRR_Pathfinder daily climatological SST. For more information on this reference field see http://accession.nodc.noaa.gov/0071180. comment: The difference between this SST and the previous day's SST.
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| wind_speed: | Grid standard_name: wind_speed long_name: 10m wind speed coverage_content_type: auxiliaryInformation grid_mapping: crs units: m s-1 height: 10 m add_offset: 0.000000000000000 scale_factor: 1.000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 time_offset: 1.472200000000001 source: NCEP/DOE AMIP-II Reanalysis (Reanalysis-2): u_wind.10m.gauss.1996.nc, v_wind.10m.gauss.1996.nc comment: These wind speeds were created by NCEP-DOE Atmospheric Model Intercomparison Project (AMIP-II) reanalysis (R-2) and represent winds at 10 metres above the sea surface.
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| sea_ice_fraction: | Grid standard_name: sea_ice_area_fraction long_name: sea ice fraction coverage_content_type: auxiliaryInformation grid_mapping: crs units: percent add_offset: 0.000000000000000 scale_factor: 0.01000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 time_offset: 1.000000000000000 source: NOAA/NESDIS/NCDC Daily optimum interpolation(OI) SST on 1/4-degree grid: 19960106-NCDC-L4LRblend-GLOB-v01-fv02_0-AVHRR_OI.nc.gz comment: Sea ice concentration data are taken from the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSISAF) Global Daily Sea Ice Concentration Reprocessing Data Set (http://accession.nodc.noaa.gov/0068294) when these data are available. The data are reprojected and interpolated from their original polar stereographic projection at 10km spatial resolution to the 4km Pathfinder Version 5.3 grid. When the OSISAF data are not available for both hemispheres on a given day, the sea ice concentration data are taken from the sea_ice_fraction variable found in the L4 GHRSST DailyOI SST product from NOAA/NCDC, and are interpolated from the 25km DailyOI grid to the 4km Pathfinder Version 5.3 grid. reference: Reynolds, et al.(2006) Daily High-resolution Blended Analyses. Available at http://doi.org/10.7289/V5SQ8XB5
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| aerosol_dynamic_indicator: | Grid long_name: aerosol dynamic indicator coverage_content_type: auxiliaryInformation grid_mapping: crs units: percent add_offset: 0.000000000000000 scale_factor: 1.000000000000000 valid_min: -127 valid_max: 127 _FillValue: -128 time_offset: 360.0000000000000 source: CLASS_AVHRRPF_AOT reference: http://www.class.ncdc.noaa.gov/saa/products/search?sub_id=0&datatype_family=AVHRRPF comment: Aerosol optical thickness (AOT) data are taken from the CLASS Pathfinder (from AVHRR) (AVHRRPF). The aerosol optical thickness/depth (AOT/AOD) measurements are extracted from PATMOS-A2 monthly mean and reprojected and interpolated from their original 1 degree x 1 degree resolution to the 4km Pathfinder Version 5.3 grid.
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| quality_level: | Grid long_name: quality level of SST pixel coverage_content_type: qualityInformation grid_mapping: crs units: 1 add_offset: 0.000000000000000 scale_factor: 1.000000000000000 valid_min: 1 valid_max: 5 _FillValue: 0 flag_meanings: no_data bad_data worst_quality low_quality acceptable_quality best_quality flag_values: 0, 1, 2, 3, 4, 5 ancillary_variables: pathfinder_quality_level source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: These are the overall quality indicators and are used for all GHRSST SSTs. Note, the native Pathfinder processing system returns quality levels ranging from 0 to 7 (7 is best quality; -1 represents missing data) and has been converted to the extent possible into the six levels required by the GDS2 (ranging from 0 to 5, where 5 is best). Below is the conversion table: GDS2 required quality_level 5 = native Pathfinder quality level 7 == best_quality GDS2 required quality_level 4 = native Pathfinder quality level 4-6 == acceptable_quality GDS2 required quality_level 3 = native Pathfinder quality level 2-3 == low_quality GDS2 required quality_level 2 = native Pathfinder quality level 1 == worst_quality GDS2 required quality_level 1 = native Pathfinder quality level 0 = bad_data GDS2 required quality_level 0 = native Pathfinder quality level -1 = missing_data The original Pathfinder quality level is recorded in the optional variable pathfinder_quality_level.
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| pathfinder_quality_level: | Grid long_name: Pathfinder SST quality flag coverage_content_type: qualityInformation grid_mapping: crs units: 1 add_offset: 0.000000000000000 scale_factor: 1.000000000000000 valid_min: 0 valid_max: 7 _FillValue: -1 flag_meanings: bad_data worst_quality low_quality low_quality acceptable_quality acceptable_quality acceptable_quality best_quality flag_values: 0, 1, 2, 3, 4, 5, 6, 7 source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: This variable contains the native Pathfinder processing system quality levels, ranging from 0 to 7, where 0 is worst and 7 is best. And value -1 represents missing data.
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| l2p_flags: | Grid long_name: L2P flags coverage_content_type: auxiliaryInformation grid_mapping: crs units: 1 add_offset: 0.000000000000000 scale_factor: 1.000000000000000 valid_min: 0 valid_max: 256 flag_meanings: microwave land ice lake river reserved_for_future_use extreme_sst unused_currently unused_currently flag_masks: 1, 2, 4, 8, 16, 32, 64, 128, 256 source: AVHRR_GAC-CLASS-L1B-NOAA_14-v1 platform: NOAA-14 comment: Bit zero (0) is always set to zero to indicate infrared data. Bit one (1) is set to zero for any pixel over water (ocean, lakes and rivers). Land pixels were determined by rasterizing the Global Self-consistent Hierarchical High-resolution Shoreline (GSHHS) Database from the NOAA National Geophysical Data Center. Any 4 km Pathfinder pixel whose area is 50% or more covered by land has bit one (1) set to 1. Bit two (2) is set to 1 when the sea_ice_fraction is 0.15 or greater. Bits three (3) and four (4) indicate lake and river pixels, respectively, and were determined by rasterizing the US World Wildlife Fund's Global Lakes and Wetlands Database. Any 4 km Pathfinder pixel whose area is 50% or more covered by lake has bit three (3) set to 1. Any 4 km Pathfinder pixel whose area is 50% or more covered by river has bit four (4) set to 1. Bits six (6) indicates the daytime unrealistic SST values (>39.8°C) that remain in pf_quality_level 4 to 7. Users are recommended to avoid these values.
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