N: 66.15 S: -66.15 E: 180 W: -180
Description
Provides L2 short time critical (STC; 36-hour latency) geophysical information from the Advanced Microwave Radiometer on the Sentinel-6A Michael Freilich spacecraft including surface type, wind speed, water vapor, brightness temperature, sigma0, wet troposphere, and associated quality flags. The data are interpolated to intervals that correspond to altimetry measurements from the Poseidon-4 SAR to supply the geophysical and environmental corrections for altimetry. The S6A STC product is analogous to the Jason-3 IGDR product.
Product Summary
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
Copy Citation
Documents
DATA CITATION GUIDELINES
GENERAL DOCUMENTATION
Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|
| latitude | Latitude of measurement [-90, 90]. Positive latitude is North latitude, negative latitude is South latitude. | degrees_north | int | 2147483647 | -80000000 to 80000000 | 1.0E-6 |
| longitude | Longitude of measurement [0,360]. East longitude relative to Greenwich meridian. | degrees_east | int | 2147483647 | 0 to 359999999 | 1.0E-6 |
| rad_atm_cor_sig0_c | Value must be added to altimeter backscatter coefficient to correct for atmospheric attenuation. | dB | short | 32767 | 0 to 32766 | 0.001 |
| rad_atm_cor_sig0_c_qual | Quality flag for radiometer two-way atmospheric correction to C band backscatter coefficient. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_atm_cor_sig0_ku | Value must be added to altimeter backscatter coefficient to correct for atmospheric attenuation. | dB | short | 32767 | 0 to 32766 | 0.001 |
| rad_atm_cor_sig0_ku_qual | Quality flag for radiometer two-way atmospheric correction to Ku band backscatter coefficient. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_cloud_liquid_water | Integrated cloud liquid water content. | kg/m^2 | short | 32767 | 0 to 32766 | 0.01 |
| rad_cloud_liquid_water_qual | Quality flag for radiometer cloud liquid water content. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_distance_to_land | Shortest distance between main beam measurement and land. | m | int | 2147483647 | 0 to 2147483646 | 100 |
| rad_land_frac_187 | Fraction of land within the 18.7 GHz main beam. Value is from 0 to 1. | 1 | short | 32767 | 0 to 10000 | 0.0001 |
| rad_land_frac_238 | Fraction of land within the 23.8 GHz main beam. Value is from 0 to 1. | 1 | short | 32767 | 0 to 10000 | 0.0001 |
| rad_land_frac_340 | Fraction of land within the 34.0 GHz main beam. Value is from 0 to 1. | 1 | short | 32767 | 0 to 10000 | 0.0001 |
| rad_rain_flag | Flag indicating if radiometer measurement is invalid due to rain contamination. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_sea_ice_flag | Flag indicating if radiometer measurement is invalid due to sea ice contamination. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_state_oper_flag | Flag indicating operating state of radiometer. A value of 0 indicates nominal science measurements from the instrument. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_surface_type_flag | Flag indicating the validity and type of processing applied to generate the wet troposphere correction (rad_wet_tropo_cor). A value of 0 indicates that open ocean processing is used, a value of 1 indicates coastal processing, and a value of 2 indicates that rad_wet_tropo_cor is invalid due to land contamination. | N/A | byte | 127 | 0 to 2 | 1 |
| rad_ta_187 | Antenna temperature measurement at 18.7 GHz. | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_ta_187_qual | Quality flag for 18.7 GHz antenna temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_ta_238 | Antenna temperature measurement at 23.8 GHz. | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_ta_238_qual | Quality flag for 23.8 GHz antenna temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_ta_340 | Antenna temperature measurement at 34.0 GHz. | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_ta_340_qual | Quality flag for 34.0 GHz antenna temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tb_187 | Equalized brightness temperature measurement at 18.7 GHz. Value is smoothed (along-track averaging has been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tb_187_qual | Quality flag for 18.7 GHz equalized brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tb_238 | Equalized brightness temperature measurement at 23.8 GHz. Value is smoothed (along-track averaging has been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tb_238_qual | Quality flag for 23.8 GHz equalized brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tb_340 | Equalized brightness temperature measurement at 34.0 GHz. Value is smoothed (along-track averaging has been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tb_340_qual | Quality flag for 34.0 GHz equalized brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tmb_187 | Main beam brightness temperature measurement at 18.7 GHz. Value is unsmoothed (along-track averaging has not been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tmb_187_qual | Quality flag for 18.7 GHz main beam brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tmb_238 | Main beam brightness temperature measurement at 23.8 GHz. Value is unsmoothed (along-track averaging has not been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tmb_238_qual | Quality flag for 23.8 GHz main beam brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_tmb_340 | Main beam brightness temperature measurement at 34.0 GHz. Value is unsmoothed (along-track averaging has not been performed). | K | int | 2147483647 | 0 to 36000 | 0.01 |
| rad_tmb_340_qual | Quality flag for 34.0 GHz main beam brightness temperature. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_water_vapor | Integrated water vapor content. | kg/m^2 | short | 32767 | 0 to 32766 | 0.1 |
| rad_water_vapor_qual | Quality flag for radiometer water vapor content. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_wet_tropo_cor | Value must be added to altimeter range to correct for delay due to the wet troposphere. | m | short | 32767 | -10000 0 | 0.0001 |
| rad_wet_tropo_cor_qual | Quality flag for radiometer wet troposphere correction. | N/A | byte | 127 | 0 to 1 | 1 |
| rad_wind_speed | Sea surface wind speed. | m/s | short | 32767 | 0 to 32766 | 0.01 |
| rad_wind_speed_qual | Quality flag for radiometer wind speed. | N/A | byte | 127 | 0 to 1 | 1 |
| time | Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute leap_second is set to the UTC time at which the leap second occurs. | seconds since 2000-01-01 00:00:00.0 | double | 9.9692099683869E+36 | N/A | 1 |
| time_tai | Time of measurement in seconds in the TAI time scale since 1 Jan 2000 00:00:00 TAI. This time scale contains no leap seconds. The difference (in seconds) with time in UTC is given by the attribute [time:tai_utc_difference]. | seconds since 2000-01-01 00:00:00.0 | double | 9.9692099683869E+36 | N/A | 1 |