SMAP Maps: Sea Surface Salinity

  • Sea surface salinity, April 2015

    April 2015

  • Sea surface salinity, May 2015

    May 2015

  • Sea surface salinity, June 2015

    June 2015

  • Sea surface salinity, July 2015

    July 2015

  • Sea surface salinity, August 2015

    August 2015

  • Sea surface salinity, September 2015

    September 2015

  • Sea surface salinity, October 2015

    October 2015

  • Sea surface salinity, November 2015

    November 2015

  • Sea surface salinity, December 2015

    December 2015

  • Sea surface salinity, January 2016

    January 2016

  • Sea surface salinity, February 2016

    February 2016

  • Sea surface salinity, March 2016

    March 2016

  • Sea surface salinity, April 2016

    April 2016

  • Sea surface salinity, May 2016

    May 2016

  • Sea surface salinity, June 2016

    June 2016

  • Sea surface salinity, July 2016

    July 2016

  • Sea surface salinity, August 2016

    August 2016

  • Sea surface salinity, September 2016

    September 2016

  • Sea surface salinity, October 2016

    October 2016

  • Sea surface salinity, November 2016

    November 2016

  • Sea surface salinity, December 2016

    December 2016

  • Sea surface salinity, January 2017

    January 2017

  • Sea surface salinity, February 2017

    February 2017

  • Sea surface salinity, March 2017

    March 2017

  • Sea surface salinity, April 2017

    April 2017

  • Sea surface salinity, May 2017

    May 2017

  • Sea surface salinity, June 2017

    June 2017

  • Sea surface salinity, July 2017

    July 2017

  • Sea surface salinity, August 2017

    August 2017

  • Sea surface salinity, September 2017

    September 2017

  • Sea surface salinity, October 2017

    October 2017

  • Sea surface salinity, November 2017

    November 2017

  • Sea surface salinity, December 2017

    December 2017

  • Sea surface salinity, January 2018

    January 2018

  • Sea surface salinity, February 2018

    February 2018

  • Sea surface salinity, March 2018

    March 2018

  • Sea surface salinity, April 2018

    April 2018

  • Sea surface salinity, May 2018

    May 2018

  • Sea surface salinity, June 2018

    June 2018

  • Sea surface salinity, July 2018

    July 2018

  • Sea surface salinity, August 2018

    August 2018

  • Sea surface salinity, September 2018

    September 2018

  • Sea surface salinity, October 2018

    October 2018

  • Credit
  • Credit
Slideshow: Monthly composite maps of sea surface salinity (hover over images to pause the slideshow).

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.

Read more about the differences between Aquarius and SMAP

The maps below are generated from Version 2.0 (V2.0) 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 V2.0 SMAP salinity maps is not the same as the one used for Aquarius Version 5.0 maps. There are plans to implement a consistent color scale between these 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)

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, 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, 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
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