TITLE: Oceanographic Data Collected Aboard RV Polar Duke November 1991 AUTHOR: CM Lascara, RC Smith, D Menzies and KS Baker CCPO Technical Report No. 93-01 SIO Reference Series No. 93-40 Palmer LTER Contribution No. 27 From 7-21 November 1991, a multidisciplinary cruise was conducted aboard the RV Polar Duke as part of the Palmer Long-Term Ecological Research (LTER) program off the Antarctic Peninsula. Stations were occupied at specified grid locations (Figure 1) within the Palmer LTER survey grid (Waters and Smith, 1992). The cruise departed on 1 November and returned on 25 November to Punta Arenas, Chile. Oceanographic data were collected using a Bio-Optical Profiling System (BOPS) (for a complete description see Smith et al., 1984 and Smith and Baker, 1984). The BOPS package was configured with a SeaBird CTD sensor to measure temperature, conductivity, and pressure; A BioSpherical PAR and spectral irradiance sensor; and a SeaTech fluorometer. This data report presents the following hydrographic variables which were measured directly or derived from measured variables as part of this cruise: temperature, potential temperature, salinity, density, dynamic height, and Brunt-Vaisala frequency.