Data Versions

This page lists details for Aquarius data products by version number, dates, and changes included in the versions.

Note: Due to a power failure on the Satélite de Aplicaciones Científicas (SAC-D) platform on 08 June 2015, data from NASA's Aquarius instrument are no longer being produced. For more information on this event, please refer to the official NASA announcement. The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) will continue to distribute Aquarius soil moisture and polar-gridded data sets for the full duration of the mission, 25 August 2011 to 07 June 2015.

Aquarius Soil Moisture Products

Aquarius Polar-Gridded Products

Aquarius Soil Moisture Products


Aquarius L2 Swath Single Orbit Soil Moisture (AQ2_SM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 30 April 2014 First version available from NSIDC.
V3 25 August 2011 to 07 June 2015 Changes to the Version 3 Aquarius Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input.


Aquarius L3 Gridded 1-Degree Daily Soil Moisture (AQ3_DYSM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 30 April 2014 First version available from NSIDC.
V3 25 August 2011 to 30 April 2015 The Aquarius L3 gridded 1-degree soil soisture Version 3 data are processed from the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data.

Changes to the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input..


Aquarius L3 Gridded 1-Degree Weekly Soil Moisture (AQ3_WKSM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 30 April 2014 First version available from NSIDC.
V3 25 August 2011 to 23 April 2015 The Aquarius L3 gridded 1-degree soil soisture Version 3 data are processed from the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data.

Changes to the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input.


Aquarius L3 Gridded 1-Degree Monthly Soil Moisture (AQ3_MOSM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 30 April 2014 First version available from NSIDC.
V3 25 August 2011 to 01 April 2015 The Aquarius L3 gridded 1-degree soil soisture Version 3 data are processed from the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data.

Changes to the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input.


Aquarius L3 Gridded 1-Degree Seasonal Soil Moisture (AQ3_SNSM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 20 March 2014 First version available from NSIDC.
V3 25 August 2011 to 21 December 2014 The Aquarius L3 gridded 1-degree soil soisture Version 3 data are processed from the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data.

Changes to the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input.


Aquarius L3 Gridded 1-Degree Annual Soil Moisture (AQ3_ANSM)

Version Dates Changes Included In This Version
V2 25 August 2011 to 31 December 2013 First version available from NSIDC.
V3 25 August 2011 to 31 December 2014 The Aquarius L3 gridded 1-degree soil soisture Version 3 data are processed from the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data.

Changes to the Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data include: use of the most recent version (Version 3) of Aquarius Brightness Temperatures as input; Aquarius Brightness Temperatures are no longer re-calibrated before soil moisture retrievals as was done for Version 2 data; soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data; updates to the soil moisture model parameters (b and ω).
V4 25 August 2011 to 07 June 2015 Changes in the Version 4 Aquarius Soil Moisture data include: use of the most recent version (Version 4) of Aquarius Brightness Temperatures as input.


Aquarius L3 Gridded 1-Degree Monthly Soil Moisture Climatology (AQ3_MCSM)

Version Dates Changes Included In This Version
V4 25 August 2011 to 31 May 2015 First version available from NSIDC.


Aquarius L3 Gridded 1-Degree Seasonal Soil Moisture Climatology (AQ3_SCSM)

Version Dates Changes Included In This Version
V4 25 August 2011 to 07 June 2015 First version available from NSIDC.

Aquarius Polar-Gridded Products


Aquarius L3 Weekly Polar-Gridded Brightness Temperature and Sea Surface Salinity (AQ3_TB)

Version Dates Changes Included In This Version
V4 25 August 2011 to 23 April 2015 Version 4 of Aquarius L3 Weekly Polar-Gridded Brightness Temperature and Sea Surface Salinity utilizes Version 3 of the PO.DAAC Level-2 Aquarius TB as input data. This is the first version available from NSIDC.
V5 25 August 2011 to 28 May 2015 Version 5 of Aquarius L3 Weekly Polar-Gridded Brightness Temperature and Sea Surface Salinity utilizes Version 4 of the Level-2 Aquarius TB as input data.


Aquarius L3 Weekly Polar-Gridded Normalized Radar Cross Section (AQ3_NRCS)

Version Dates Changes Included In This Version
V4 25 August 2011 to 23 April 2015 Version 4 of Aquarius L3 Weekly Polar-Gridded Normalized Radar Cross Section utilizes Version 3 of the Aquarius Level-2 NRCS as input data. This is the first version available from NSIDC.
V5 25 August 2011 to 28 May 2015 Version 5 of Aquarius L3 Weekly Polar-Gridded Normalized Radar Cross Section utilizes Version 4 of the Aquarius Level-2 NRCS as input data.


Aquarius L3 Weekly Polar-Gridded Sea Surface Salinity (AQ3_SSS)

Version Dates Changes Included In This Version
V4 25 August 2011 to 23 April 2015 Version 4 of Aquarius L3 Weekly Polar-Gridded Sea Surface Salinity utilizes Version 3 of the PO.DAAC Level-2 Aquarius SSS as input data. This is the first version available from NSIDC.
V5 25 August 2011 to 28 May 2015 Version 5 of Aquarius L3 Weekly Polar-Gridded Sea Surface Salinity utilizes Version 4 of the Level-2 Aquarius SSS as input data.