. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 450 500 550 600 WAVELENGTH (nm) 700 Figure South-to-north (left to right) cross section of the Gulf Loop Current's cyclonic boundary. Isotherms in the thermal cross section are in degrees Celsius. The cyclonic edge marks not only where temperature, scattering, and chlorophyll values change, but also salinity, current velocity, and frequently sea state. Inset are reflectance spectra; one taken in the Gulf Stream (GS), the other taken in the coast
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 450 500 550 600 WAVELENGTH (nm) 700 Figure South-to-north (left to right) cross section of the Gulf Loop Current's cyclonic boundary. Isotherms in the thermal cross section are in degrees Celsius. The cyclonic edge marks not only where temperature, scattering, and chlorophyll values change, but also salinity, current velocity, and frequently sea state. Inset are reflectance spectra; one taken in the Gulf Stream (GS), the other taken in the coastal water (CW). Mixed layer depth suggests that the optical properties which affect spectra are homogeneous for at least 20 m. The surface temperature field (Ts) shows a marked decrease near the current's edge. This is the thermal signature that completely disappears for 3 or 4 months when summer insolation makes these waters isothermal, thus rendering infrared techniques useless. The subsurface thermal field reflects early summer conditions: mixed layer depth of approximately 20 m, gentle slope of warmer isotherms (, 22°C), and steeper slope of cooler isotherms (, 14°C) when going'toward the current. The core of the current is further offshore (to the left) than this section shows. Details of the boundary between the current and coastal waters are empha- sized here to demonstrate use of visible techniques for remote sensing in tropical and subtropical waters. 368. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Se
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