TITLE: Oceanographic Data Collected Aboard RV Polar Duke March - May 1993 AUTHOR: DA Smith , RC Smith, D Menzies CCPO Technical Report No. 93-05 SIO Reference Series No. 93-44 Palmer LTER Contribution No. 31 From 25 March to 15 May 1993, an multidisciplinary cruise was conducted aboard the RV Nathaniel B. Palmer 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 from and returned to Punta Arenas, Chile. Hydrographic data were collected on this cruise using two separate sampling devices, a Sea-Bird CTD system and a Bio-Optical Profiling System (BOPS). The measurements collected using the Sea-Bird CTD system are presented in a separate report (CCPO Technical Report No. 93-04). However, eight CTD casts were excluded from the CTD report and are appended to this BOPS report (see Appendix 1). Sampling and processing procedures used for these CTD casts are given in CCPO Technical Report No. 93-04. This data report presents measurements collected using the BOPS sampling system, which was configured with a SeaBird CTD sensor to measure temperature, conductivity, and pressure; a BioSpherical PAR and spectral irradiance sensor; and a SeaTech fluorometer (for a complete description see Smith et al., 1984 and Smith and Baker, 1984). The following reported variables were measured directly or derived from measured variables suing BOPS: temperature, potential temperature, salinity, density, dynamic height, and Brunt-Vaisala frequency. Upon return from the cruise, the BOPS data were initially processed at the Center for Remote Sensing and Environmental Optics at University of California, Santa Barbara. Final processing and report generation were completed at the Center for Coastal Physical Oceanography (CCPO) at Old Dominion University. Tapes of this data at one-meter resolution have been sent to the National Oceanographic Data Center.