We are indebted to several colleagues for many useful discussions about this work, to the reviewers for many useful comments, and to one reviewer in particular for the idea in section 5b. We thank Marco Matricardi of ECMWF for providing the TIGR profiles, the NOAA SAA for the global 50-km-resolution SST analysis data, and the BSH for the Baltic Sea SST analysis. We must also thank the other staff in the Measurement of Tropospheric Humidity (MOTH) projects and the flight crew of the C-130 research aircraft for their part in gathering the data presented here.
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