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S. Joseph Munchak, Robert Meneghini, Mircea Grecu, and William S. Olson

the purpose of ocean salinity retrieval, was launched. Yueh et al. (2013) developed GMFs based on SSM/I and NCEP reanalysis collocations and found that the resulting combined active–passive retrievals of wind speed and salinity compared favorably to salinity retrievals where ancillary data were used to set the wind vector. The growing number of satellites with active and passive microwave instruments (e.g., TRMM, GPM, Aquarius , SMAP), along with airborne platforms [e.g., the NASA Global Hawk

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F. Joseph Turk, Z. S. Haddad, and Y. You

of the 10H-GHz TB, as the location gradually transitions from fairly dry land in May to surface water by July and slowly back to land after November. The use of passive MW observations for estimating the extent of inundated land has a long heritage ( Salvia et al. 2011 ). Since this area is mainly sediment-filled freshwater (and not saline ocean water as in Fig. 5 , which had 10H TB near 90 K for similar T sfc values), there are correspondingly different emissivity values. During the summer

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