HIAPER mission: Fly a microwave sea surface salinity mapper and a high resolution active/passive ocean color instrument. Supplement with high-res SST and dropsondes. On a day with forecast clear conditions on the Atlantic coast, fly south from Denver, intersecting the Gulf coast near Houston. Follow the Gulf and Atlantic coastlines, including the Florida penninsula, all the way to Maine, mapping SSS, SST, and ocean color. Fly at 50,000 ft, above Atlantic air traffic. Broadcast real-time SSS, SST and ocean color imagery to ships in the Missippii outflow and Chesapeake Bay regions and to research laboratories in coastal states. Next day, using forecasts, ATC guidance, analysis of images from the previous mission, and known locations of research vessels (which may have deployed or moved based on imagery from the previous day), make multiple passes over two coastal regions at lower altitudes (20,000 ft). Use SSS and SST mappers and the ocean color instrument in active mode (dual wavelength laser-induced fluorescence) to distinguish biota from suspended sediments and to identify potentially harmful organisms by unique fluorescence signatures. Use dropsondes to determine atmospheric moisture attenuation of remote sensing signals and to map local near-surface wind fields for subsequent coupled biophysical modeling of the coastal regions. Broadcast these regional data to appropriate laboratories. Execute a surface to 40,000 feet vertical profile over an aerosol lidar on a ship, using HIAPER standard particle probes. End the second flight back in Denver. PIs and Co-PIs for this mission could work on ships and in East coast laboratories yet receive HIAPER data and direct the second day's operations.