Ocean salinity is measured from space using satellite radiometers that detect surface emissivity
Ocean salinity is routinely measured from space using satellite radiometers that detect surface microwave emissions and brightness temperatures.
The claim is a specific and falsifiable statement about remote sensing of ocean salinity. Multiple scientific papers, including reviews and mission analyses for SMOS, SMAP, and Aquarius, confirm that satellite microwave radiometers are used to measure sea surface salinity by detecting surface emissivity and brightness temperatures.
Gholizadeh MH, Melesse AM, Reddi L. A Comprehensive Review on Water Quality Parameters Estimation Using Remote Sensing Techniques.. 2016. https://doi.org/10.3390/s16081298
Paper 0 lists sea surface salinity (SSS) among water quality parameters evaluated via spaceborne remote sensing techniques.
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Severine Fournier, Tong Lee. Seasonal and Interannual Variability of Sea Surface Salinity Near Major River Mouths of the World Ocean Inferred from Gridded Satellite and In-Situ Salinity Products. 2021. https://doi.org/10.3390/rs13040728
Paper 1 discusses how missions like SMOS and SMAP measure sea surface salinity from space.
Johnson JT, Jezek KC, Macelloni G, Brogioni M, Tsang L, Dinnat EP, Walker JP, Ye N, Misra S, Piepmeier JR, Bindlish R, LeVine DM, O'Neill PE, Kaleschke L, Andrews MJ, Yardim C, Aksoy M, Durand M, Chen CC, Demir O, Bringer A, Miller JZ, Brown ST, Kwok R, Lee T, Kerr Y, Entekhabi D, Peng J, Colliander A, Chan S, MacGregor JA, Medley B, DeRoo R, Drinkwater M. Microwave Radiometry at Frequencies From 500 to 1400 MHz: An Emerging Technology for Earth Observations.. 2021. https://doi.org/10.1109/jstars.2021.3073286
Paper 5 details how spaceborne microwave radiometry has provided valuable observations of sea surface salinity.
Meissner T, Manaster A. SMAP Salinity Retrievals near the Sea-Ice Edge Using Multi-Channel AMSR2 Brightness Temperatures.. 2021. https://doi.org/10.3390/rs13245120
Paper 9 analyzes sea-surface salinity retrievals using spaceborne L-band radiometers and brightness temperatures.
Dinnat EP, Brucker L. Improved Sea Ice Fraction Characterization for L-Band Observations by the Aquarius Radiometers.. 2017. https://doi.org/10.1109/tgrs.2016.2622011
Paper 10 discusses L-band radiometers used to retrieve sea surface salinity over oceans.
Janna E. Rückert, Andreas Walbröl, Nils Risse, Pavel Krobot, Rainer Haseneder-Lind, Mario Mech, Kerstin Ebell, Gunnar Spreen. Microwave sea ice and ocean brightness temperature and emissivity between 22 and 243 GHz from ship-based radiometers. 2025. https://doi.org/10.1017/aog.2025.1
Paper 11 examines microwave radiometry and surface emissivity measurements relevant to satellite retrieval algorithms.
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