Remote sensing of ocean salinity: Results from the Delaware coastal current experiment

A comparison is presented of remote and shipboard measurements of sea surfa ce salinity made in the vicinity of the Delaware coastal current, a low sal inity band with its source in the mouth of Delaware Bay. The remote sensing measurements were made from an aircraft with the Electronically Scanned Th inned Array Radiometer. The shipboard measurements were made with a thermos alinograph on board the R/V Cape Henlopen. On 29-30 April 1993, the RN Cape Henlopen sailed from the mouth of Delaware Bay south toward Chesapeake Bay in an east-west zig-zag pattern, repeatedly crossing the coastal current. The aircraft, a NASA P-3, flew the same lines on the afternoon of 30 April. Both thermosalinograph- and microwave radiometer-derived salinity maps cle arly show the freshwater signature of the coastal current and generally are in agreement to within about 1 psu.