SMAP Maps: Sea Surface Salinity

NASA's Soil Moisture Active Passive (SMAP) mission began collecting sea surface salinity data in April 2015, overlapping with Aquarius observations for approximately three months. Using the same frequency as Aquarius (L-band; 1.41 GHz), SMAP's global salinity measurements continue the time series that began with Aquarius in August 2011.

Global | Northern Hemisphere | Southern Hemisphere

The maps below are generated from Version 4.0 (V4) of the SMAP sea surface salinity Level-3 (mapped) data. These monthly averaged data are gridded at 25 x 25 km (15.5 X 15.5 mi) resolution, with an approximate spatial resolution of 70km. They show a range of salinities from 33 to 38 using the Practical Salinity Scale (PSS; Lewis, 1980), which is roughly equivalent to parts per thousand. PSS and PSU (Practical Salinity Units, which is also used), are different names for the same thing.

Dark blues and purples represent lower salinities while reds show areas of higher sea surface salinity. It is important to note that the color scale used for the V4 SMAP salinity maps is not the same as the one used for Aquarius Version 5.0 maps.

SMAP monthly sea surface salinity maps are available below in Mollweide (global), Northern Hemisphere and Southern Hemisphere projections. Click on any of the images below to see larger versions. Monthly data, along with 8-day running mean sea surface salinities, are available from PO.DAAC.

Global (Mollweide Projection)

January 2022
Sea surface salinity, December 2021
December 2021
Sea surface salinity, November 2021
November 2021
Sea surface salinity, October 2021
October 2021
Sea surface salinity, September 2021
September 2021
Sea surface salinity, August 2021
August 2021
Sea surface salinity, July 2021
July 2021
Sea surface salinity, June 2021
June 2021
Sea surface salinity, May 2021
May 2021
Sea surface salinity, April 2021
April 2021
Sea surface salinity, March 2021
March 2021
Sea surface salinity, February 2021
February 2021
Sea surface salinity, January 2021
January 2021
Sea surface salinity, December 2020
December 2020
Sea surface salinity, November 2020
November 2020
Sea surface salinity, October 2020
October 2020
Sea surface salinity, September 2020
September 2020
Sea surface salinity, August 2020
August 2020
Sea surface salinity, July 2020
July 2020
Sea surface salinity, June 2020
June 2020
Sea surface salinity, May 2020
May 2020
Sea surface salinity, April 2020
April 2020
Sea surface salinity, March 2020
March 2020
Sea surface salinity, February 2020
February 2020
Sea surface salinity, January 2020
January 2020
Sea surface salinity, December 2019
December 2019
Sea surface salinity, November 2019
November 2019
Sea surface salinity, October 2019
October 2019
Sea surface salinity, September 2019
September 2019
Sea surface salinity, August 2019
August 2019
Sea surface salinity, July 2019
July 2019
Sea surface salinity, June 2019
June 2019
Sea surface salinity, May 2019
May 2019
Sea surface salinity, April 2019
April 2019
Sea surface salinity, March 2019
March 2019
Sea surface salinity, February 2019
February 2019
Sea surface salinity, January 2019
January 2019
Sea surface salinity, December 2018
December 2018
Sea surface salinity, November 2018
November 2018
Sea surface salinity, October 2018
October 2018
Sea surface salinity, September 2018
September 2018
Sea surface salinity, August 2018
August 2018
Sea surface salinity, July 2018
July 2018
Sea surface salinity, June 2018
June 2018
Sea surface salinity, May 2018
May 2018
Sea surface salinity, April 2018
April 2018
Sea surface salinity, March 2018
March 2018
Sea surface salinity, February 2018
February 2018
Sea surface salinity, January 2018
January 2018
Sea surface salinity, December 2017
December 2017
Sea surface salinity, November 2017
November 2017
Sea surface salinity, October 2017
October 2017
Sea surface salinity, September 2017
September 2017
Sea surface salinity, May 2017
May 2017
Sea surface salinity, April 2017
April 2017
Sea surface salinity, March 2017
March 2017
Sea surface salinity, February 2017
February 2017
Sea surface salinity, January 2017
January 2017
Sea surface salinity, December 2016
December 2016
Sea surface salinity, November 2016
November 2016
Sea surface salinity, October 2016
October 2016
Sea surface salinity, September 2016
September 2016
Sea surface salinity, August 2016
August 2016
Sea surface salinity, July 2016
July 2016
Sea surface salinity, June 2016
June 2016
Sea surface salinity, May 2016
May 2016
Sea surface salinity, April 2016
April 2016
Sea surface salinity, March 2016
March 2016
Sea surface salinity, February 2016
February 2016
Sea surface salinity, January 2016
January 2016
Sea surface salinity, December 2015
December 2015
Sea surface salinity, November 2015
November 2015
Sea surface salinity, October 2015
October 2015
Sea surface salinity, September 2015
September 2015
Sea surface salinity, August 2015
August 2015
Sea surface salinity, July 2015
July 2015
Sea surface salinity, June 2015
June 2015
Sea surface salinity, May 2015
May 2015
Sea surface salinity, April 2015
April 2015

Northern Hemisphere

View Slideshow »
Sea surface salinity, December 2021
December 2021
Sea surface salinity, November 2021
November 2021
Sea surface salinity, October 2021
October 2021
Sea surface salinity, September 2021
September 2021
Sea surface salinity, August 2021
August 2021
Sea surface salinity, July 2021
July 2021
Sea surface salinity, June 2021
June 2021
Sea surface salinity, May 2021
May 2021
Sea surface salinity, April 2021
April 2021
Sea surface salinity, March 2020
March 2021
Sea surface salinity, February 2020
February 2021
Sea surface salinity, January 2020
January 2021
Sea surface salinity, December 2020
December 2020
Sea surface salinity, November 2020
November 2020
Sea surface salinity, October 2020
October 2020
Sea surface salinity, September 2020
September 2020
Sea surface salinity, August 2020
August 2020
Sea surface salinity, July 2020
July 2020
Sea surface salinity, June 2020
June 2020
Sea surface salinity, May 2020
May 2020
Sea surface salinity, April 2020
April 2020
Sea surface salinity, March 2020
March 2020
Sea surface salinity, February 2020
February 2020
Sea surface salinity, January 2020
January 2020
Sea surface salinity, December 2019
December 2019
Sea surface salinity, November 2019
November 2019
Sea surface salinity, October 2019
October 2019
Sea surface salinity, September 2019
September 2019
Sea surface salinity, August 2019
August 2019
Sea surface salinity, July 2019
July 2019
Sea surface salinity, June 2019
June 2019
Sea surface salinity, May 2019
May 2019
Sea surface salinity, April 2019
April 2019
Sea surface salinity, March 2019
March 2019
Sea surface salinity, February 2019
February 2019
Sea surface salinity, January 2019
January 2019
Sea surface salinity, December 2018
December 2018
Sea surface salinity, November 2018
November 2018
Sea surface salinity, October 2018
October 2018
Sea surface salinity, September 2018
September 2018
Sea surface salinity, August 2018
August 2018
Sea surface salinity, July 2018
July 2018
Sea surface salinity, June 2018
June 2018
Sea surface salinity, May 2018
May 2018
Sea surface salinity, April 2018
April 2018
Sea surface salinity, March 2018
March 2018
Sea surface salinity, February 2018
February 2018
Sea surface salinity, January 2018
January 2018
Sea surface salinity, December 2017
December 2017
Sea surface salinity, November 2017
November 2017
Sea surface salinity, October 2017
October 2017
Sea surface salinity, September 2017
September 2017
Sea surface salinity, August 2017
August 2017
Sea surface salinity, July 2017
July 2017
Sea surface salinity, June 2017
June 2017
Sea surface salinity, May 2017
May 2017
Sea surface salinity, April 2017
April 2017
Sea surface salinity, March 2017
March 2017
Sea surface salinity, February 2017
February 2017
Sea surface salinity, January 2017
January 2017
Sea surface salinity, December 2016
December 2016
Sea surface salinity, November 2016
November 2016
Sea surface salinity, October 2016
October 2016
Sea surface salinity, September 2016
September 2016
Sea surface salinity, August 2016
August 2016
Sea surface salinity, July 2016
July 2016
Sea surface salinity, June 2016
June 2016
Sea surface salinity, May 2016
May 2016
Sea surface salinity, April 2016
April 2016
Sea surface salinity, March 2016
March 2016
Sea surface salinity, February 2016
February 2016
Sea surface salinity, January 2016
January 2016
Sea surface salinity, December 2015
December 2015
Sea surface salinity, November 2015
November 2015
Sea surface salinity, October 2015
October 2015
Sea surface salinity, September 2015
September 2015
Sea surface salinity, August 2015
August 2015
Sea surface salinity, July 2015
July 2015
Sea surface salinity, June 2015
June 2015
Sea surface salinity, May 2015
May 2015
Sea surface salinity, April 2015
April 2015

Southern Hemisphere

View Slideshow »
Sea surface salinity, December 2021
December 2021
Sea surface salinity, November 2021
November 2021
Sea surface salinity, October 2021
October 2021
Sea surface salinity, September 2021
September 2021
Sea surface salinity, August 2021
August 2021
Sea surface salinity, July 2021
July 2021
Sea surface salinity, June 2021
June 2021
Sea surface salinity, May 2021
May 2021
Sea surface salinity, April 2021
April 2021
Sea surface salinity, March 2020
March 2021
Sea surface salinity, February 2020
February 2021
Sea surface salinity, January 2020
January 2021
Sea surface salinity, December 2020
December 2020
Sea surface salinity, November 2020
November 2020
Sea surface salinity, October 2020
October 2020
Sea surface salinity, September 2020
September 2020
Sea surface salinity, August 2020
August 2020
Sea surface salinity, July 2020
July 2020
Sea surface salinity, June 2020
June 2020
Sea surface salinity, May 2020
May 2020
Sea surface salinity, April 2020
April 2020
Sea surface salinity, March 2020
March 2020
Sea surface salinity, February 2020
February 2020
Sea surface salinity, January 2020
January 2020
Sea surface salinity, December 2019
December 2019
Sea surface salinity, November 2019
November 2019
Sea surface salinity, October 2019
October 2019
Sea surface salinity, September 2019
September 2019
Sea surface salinity, August 2019
August 2019
Sea surface salinity, July 2019
July 2019
Sea surface salinity, June 2019
June 2019
Sea surface salinity, May 2019
May 2019
Sea surface salinity, April 2019
April 2019
Sea surface salinity, March 2019
March 2019
Sea surface salinity, February 2019
February 2019
Sea surface salinity, January 2019
January 2019
Sea surface salinity, December 2018
December 2018
Sea surface salinity, November 2018
November 2018
Sea surface salinity, October 2018
October 2018
Sea surface salinity, September 2018
September 2018
Sea surface salinity, August 2018
August 2018
Sea surface salinity, July 2018
July 2018
Sea surface salinity, June 2018
June 2018
Sea surface salinity, May 2018
May 2018
Sea surface salinity, April 2018
April 2018
Sea surface salinity, March 2018
March 2018
Sea surface salinity, February 2018
February 2018
Sea surface salinity, January 2018
January 2018
Sea surface salinity, December 2017
December 2017
Sea surface salinity, November 2017
November 2017
Sea surface salinity, October 2017
October 2017
Sea surface salinity, September 2017
September 2017
Sea surface salinity, August 2017
August 2017
Sea surface salinity, July 2017
July 2017
Sea surface salinity, June 2017
June 2017
Sea surface salinity, May 2017
May 2017
Sea surface salinity, April 2017
April 2017
Sea surface salinity\, March 2017
March 2017
Sea surface salinity, February 2017
February 2017
Sea surface salinity, January 2017
January 2017
Sea surface salinity, December 2016
December 2016
Sea surface salinity, November 2016
November 2016
Sea surface salinity, October 2016
October 2016
Sea surface salinity, September 2016
September 2016
Sea surface salinity, August 2016
August 2016
Sea surface salinity, July 2016
July 2016
Sea surface salinity, June 2016
June 2016
Sea surface salinity, May 2016
May 2016
Sea surface salinity, April 2016
April 2016
Sea surface salinity, March 2016
March 2016
Sea surface salinity, February 2016
February 2016
Sea surface salinity, January 2016
January 2016
Sea surface salinity, December 2015
December 2015
Sea surface salinity, November 2015
November 2015
Sea surface salinity, October 2015
October 2015
Sea surface salinity, September 2015
September 2015
Sea surface salinity, August 2015
August 2015
Sea surface salinity, July 2015
July 2015
Sea surface salinity, June 2015
June 2015
Sea surface salinity, May 2015
May 2015
Sea surface salinity, April 2015
April 2015