Data Announcements

New version available: Aquarius soil moisture data sets

21 September 2018

All Aquarius soil moisture products have been updated to Version 5 and are now available from the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets provide swath-based Level-2 and gridded Level-3 soil moisture estimates from the NASA Aquarius passive microwave radiometer on the Satélite de Aplicaciones Científicas (SAC-D). Data are available from August 2011 through the end of the Aquarius mission in June 2015.

Aquarius L3 Gridded 1-Degree Annual Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/CDNI7NG92EHP

Aquarius L3 Gridded 1-Degree Seasonal Soil Moisture Climatology, Version 5
Data set DOI: https://doi.org/10.5067/FUDM43XO9TDE

Aquarius L3 Gridded 1-Degree Seasonal Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/O6J9L5JKD5YR

Aquarius L3 Gridded 1-Degree Monthly Soil Moisture Climatology, Version 5
Data set DOI: https://doi.org/10.5067/O19KHW22C685

Aquarius L3 Gridded 1-Degree Monthly Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/MJCEUOW1H6ON

Aquarius L3 Gridded 1-Degree Weekly Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/1VZM9975ARHP

Aquarius L3 Gridded 1-Degree Daily Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/PTKXKSE28XYN

Aquarius L2 Swath Single Orbit Soil Moisture, Version 5
Data set DOI: https://doi.org/10.5067/GB6FZ0UPCOGP

New data set release: Aquarius L3 Weekly Polar-Gridded Landscape Freeze/Thaw Data, Version 5

24 August 2018

The Aquarius L3 Weekly Polar-Gridded Landscape Freeze/Thaw Data, Version 5 data set is now available from the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This Level-3 (L3) data set includes weekly Northern Hemisphere landscape freeze/thaw (FT) data derived from L-band radiometer brightness temperature observations, acquired by the Aquarius sensor on board Argentina’s Satélite de Aplicaciones Científicas (SAC-D) satellite. The data are distributed on the Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0), with a spatial resolution of 36 km. The SAC-D satellite was developed collaboratively between NASA and Argentina’s space agency, Comisión Nacional de Actividades Espaciales (CONAE).

Data set DOI: https://doi.org/10.5067/OV4R18NL3BQR

NSIDC Polaris Search and Order being Retired 15 February 2017

2 February 2017

THE NSIDC Polaris Search and Order tool will be retired on 15 February 2017. Please contact NSIDC User Services via email: nsidc@nsidc.org with questions.

Version 5 Aquarius Polar-Gridded Data Now Available at NSIDC DAAC

17 December 2015

The Aquarius polar-gridded Version 5 products are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets include weekly polar-gridded Level-3 products of Aquarius L-band Normalized Radar Cross Section retrievals, Sea Surface Salinity retrievals, and radiometer Brightness Temperature observations.

To access the data and documentation, please see:

Aquarius L3 Weekly Polar-Gridded Normalized Radar Cross Section
Data Set DOI: http://dx.doi.org/10.5067/Aquarius/AQ3_NRCS.005

Aquarius L3 Weekly Polar-Gridded Sea Surface Salinity
Data Set DOI: http://dx.doi.org/10.5067/Aquarius/AQ3_SSS.005

Aquarius L3 Weekly Polar-Gridded Brightness Temperature and Sea Surface Salinity
Data Set DOI: http://dx.doi.org/10.5067/Aquarius/AQ3_TB.005

New Version 4 Aquarius Soil Moisture Data, and New Soil Moisture Climatologies

5 October 2015

Version 4 Aquarius L2 Swath Single Orbit Soil Moisture Data, and Version 4 Aquarius L3 Gridded 1-Degree Soil Moisture data are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The Level-2 data set contains global soil moisture estimates. The Level-3 data sets contain gridded daily, weekly, monthly, seasonal, and annual global soil moisture estimates.

DOI:10.5067/Aquarius/AQ2_SM.004
DOI:10.5067/Aquarius/AQ3_DYSM.004
DOI:10.5067/Aquarius/AQ3_WKSM.004
DOI:10.5067/Aquarius/AQ3_MOSM.004
DOI:10.5067/Aquarius/AQ3_SNSM.004
DOI:10.5067/Aquarius/AQ3_ANSM.004

The new climatology data sets, also available from NSIDC DAAC, contain global soil moisture climatology estimates for both monthly and seasonal composites.

Aquarius L3 Gridded 1-Degree Monthly Soil Moisture Climatology.                      DOI:10.5067/Aquarius/AQ3_MCSM.004
Aquarius L3 Gridded 1-Degree Seasonal Soil Moisture Climatology.                     DOI:10.5067/Aquarius/AQ3_SCSM.004

Aquarius/SAC-D Mission Ends

1 July 2015

Due to a power failure on the Satélite de Aplicaciones Científicas (SAC)-D spacecraft 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.  For further information and to access Aquarius data at the NSIDC DAAC, see the NSIDC Aquarius project page.

New Version 3 Aquarius Level-2 Soil Moisture Data

24 November 2014

Version 3 Aquarius L2 Swath Single Orbit Soil Moisture data are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains Level-2 global soil moisture estimates derived from the NASA Aquarius passive microwave radiometer on the Satélite de Aplicaciones Científicas (SAC-D).  Changes in Version 3 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;  and soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data.  See the Aquarius Data Sets page for more information.

DOI:10.5067/Aquarius/AQ2_SM.003

New Version 3 Aquarius Level-3 Soil Moisture Data

24 November 2014

Version 3 Aquarius L3 Gridded 1-Degree Soil Moisture data are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains Level-3 gridded daily, weekly, monthly, seasonal, and annual global soil moisture estimates derived from the NASA Aquarius passive microwave radiometer on the Satélite de Aplicaciones Científicas (SAC-D). Changes in Version 3 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; and soil moisture observations are valid over a wider range of brightness temperatures compared to Version 2 data.  See the Aquarius Data Sets page for more information.

DOI:10.5067/Aquarius/AQ3_DYSM.003
DOI:10.5067/Aquarius/AQ3_WKSM.003
DOI:10.5067/Aquarius/AQ3_MOSM.003
DOI:10.5067/Aquarius/AQ3_SNSM.003
DOI:10.5067/Aquarius/AQ3_ANSM.003

New Aquarius L3 Weekly Polar-Gridded NRCS, SSS, and TB Data

24 July 2014

NASA Aquarius level-3 weekly polar-gridded Normalized Radar Cross Section, Sea Surface Salinity, and Brightness Temperature data products are now available from NSIDC.  For documentation, and to access the data, see the Aquarius L3 NRCS, Aquarius L3 SSS, and Aquarius L3 TB data catalog pages.

NSIDC Web Site and FTP Server Down for System Maintenance

29 May 2014

From 4:30 p.m. Wednesday, June 04 until noon Friday, June 06  (USA Mountain Time), our Web site and FTP server will be unavailable due to system maintenance. We apologize for any inconvenience this may cause you.

New Aquarius L2 and L3 Soil Moisture Data

4 December 2013

NASA Aquarius Level-2 and Level-3 Soil Moisture data are now available from NSIDC.  For documentation, and to access the data, see the Aquarius Soil Moisture data sets page.