Details

Autor(en) / Beteiligte

• Tang, Wenqing
• Fore, Alexander
• Yueh, Simon
• Lee, Tong
• Hayashi, Akiko
• Sanchez-Franks, Alejandra
• Martinez, Justino
• King, Brian
• Baranowski, Dariusz

Titel

Validating SMAP SSS with in situ measurements

Ist Teil von

• Remote sensing of environment, 2017-10, Vol.200, p.326-340

Ort / Verlag

New York: Elsevier Inc

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract Sea surface salinity (SSS) retrieved from SMAP radiometer measurements are validated against in situ salinity from Argo floats, tropical moored buoys and ship-based thermosalinograph (TSG) data. SMAP SSS achieved an accuracy of 0.2PSU on a monthly basis in comparison with Argo gridded data in the tropics and mid-latitudes. In the tropical oceans, time series comparison of salinity measured at 1m by moored buoys indicates that SMAP can track large salinity changes occurred within a month. Synergetic analysis of SMAP, SMOS and Argo data allows us to identify and exclude erroneous jumps or drift in some real-time buoy data from the assessment of the satellite data. The resulting SMAP-buoy matchup analysis gives an average standard deviation of 0.22PSU and correlation coefficient of 0.73 on weekly scale. On monthly time scales, the average standard deviation reduced to 0.17PSU and the correlation coefficient improved to 0.8. SMAP L3 daily maps reveals salty water intrusions from the Arabian Sea into the Bay of Bengal during the Indian summer monsoon, consistent with the daily measurements collected from Argo floats deployed during the Bay of Bengal Boundary Layer Experiment (BoBBLE) project field campaign. In the Mediterranean Sea, the spatial pattern of SSS from SMAP is confirmed by the ship-based TSG. Comparison with individual Argo floats suggests the SMAP retrieval algorithm performs better in the Western Mediterranean region, but suffers from radio-frequency interference (RFI) and land contamination in the Eastern Mediterranean region and Adriatic Sea. •Sea surface salinity retrieved from SMAP radiometer is validated with in situ data.•SMAP achieved 0.2PSU accuracy on a monthly basis in tropics compared with Argo OI.•SMAP can track large salinity changes occurred within a month consistent with buoy.•SMAP SSS retrieved in Mediterranean Sea and BOB assessed with ship TSG and Argo STS.