NOAA Logo National Centers for Environmental Information

formerly the National Oceanographic Data Center (NODC)...  more on NCEI

NOAA Satellite and Information Service

You are here: HomeSatellite Oceanography › SSS Data Quality Monitoring

Quality Monitoring on Level-2 Sea Surface Salinity (SSS) Products from SMAP, SMOS and Aquarius Missions

The data quality monitoring systems (DQMS) for NASA's Soil Moisture Active Passive (SMAP), ESA's Soil Moisture Ocean Salinity (SMOS) and NASA's Aquarius satellites Level-2 products has been developed by the National Centers for Environmental Information (NCEI) Satellite Oceanography team. The DQMS calculates quality assurance (QA) descriptive statistics (including observation number, minimum, maximum, mean, and standard deviation) for selected parameters as new data files are received. Statistics are calculated for each orbit of the SMOS and Aquarius satellites. The DQMS also generates 1.0 degree gridded level-3 SSS data based on box averages with land/ice mask and quality flag filters at monthly and 3-day temporal resolution for SMOS and monthly and 7-day for Aquarius data, including the Combined Active-Passive (CAP) algorithm data. The NCEI-binned level-3 data are saved in netCDF files compliant with the Climate and Forecast (CF) metadata conventions.

Access NODC-binned Level-3 SSS Data

Protocol SMOS Aquarius
HTTP http://data.nodc.noaa.gov/SMOS/ http://data.nodc.noaa.gov/Aquarius/
FTP ftp://ftp.nodc.noaa.gov/pub/data.nodc/SMOS/ ftp://ftp.nodc.noaa.gov/pub/data.nodc/Aquarius/
OPeNDAP http://data.nodc.noaa.gov/opendap/SMOS/ http://data.nodc.noaa.gov/opendap/Aquarius/
THREDDS http://data.nodc.noaa.gov/thredds/catalog/smos/ http://data.nodc.noaa.gov/thredds/catalog/aquarius/
LAS http://data.nodc.noaa.gov/las/getUI.do http://data.nodc.noaa.gov/las/getUI.do

*For access to NCEI-binned Level-3 SMAP SSS data, please contact NCEI.info@noaa.gov. Currently, the data are processed daily within 24 hours latency and we are still working on putting them on the data servers.

Data Quality Monitoring

The following figures present QA descriptive statistics of sea surface salinity in each SMOS and Aquarius level-2 granule (orbit data file) after the quality and land/ice mask flags have been applied. The statistics include total valid observation number, minimum, maximum, mean, standard deviation and total number over 3-sigma edited.

SMAP

Statistics of SMAP Level-2 SSS
V4.0

click for a larger view

SMOS

Statistics of Level-2 V6.22 SSS Using Roughness Model 1
Model1

click for a larger view

Statistics of Level-2 V6.22 SSS Using Roughness Model 2
Model2

click for a larger view

Statistics of Level-2 V6.22 SSS Using Roughness Model 3
Model3

click for a larger view

Aquarius

Statistics of ADPS V4 Level-2 SSS
V4.0

click for a larger view

Statistics of CAPv4.0 Level-2 SSS
V4.0 CAP

click for a larger view