93mar NBP93-02: Fall cruise 25mar93-15may93 Austral fall LTER cruise covering region within the large scale LTER grid. March 25 to May 15, 1993, Punta Arenas to Punta Arenas, Chile. There were a total of 52 days of ship time with 10 days transit across the Drake, with few days at Palmer for loading and unloading samples and personnel, and three days lost for medical evacuation giving about 37 days of at sea time on the RV Nathaniel B. Palmer. Major objectives included: 1. Hydrographic survey of entire study region (all of large scale LTER grid); 2. Extended temporal (fall season) and spatial (further northeast and southwest) scale coverage of LTER data sets; 3. First cruise of two sets of paired cruises to test a working hypothesis about the effect of the extent of winter ice cover on larval krill survival; 4. Picking up and redeploying sediment traps placed in Palmer Basin in Nov92. Work was done aboard the R/V Nathaniel B. Palmer NBP93-2. Robin Ross served as chief scientist. Standard transect sampling at 100km intervals from northeast to southwest, from 900.* in the southern Bransfield Strain to 000.* south of Marguerite Bay. Station observations at outer boundary (900.* and 000.*) of study region included: 1. CTD casts at 10km intervals 2. XBT casts at 5km intervals, in selected areas such as the slope 3. BOPS casts at 20km intervals optics, to 500m pigments (HPLC), 8 depths nutrients (5 macronutrients in replicate), 8 depths plus depths selected for water mass identification POC/PON, 8 depths plus selected oxygen DOC/DON bacterial activity 4. acoustic transects at 20km intervals at stations with targeted tows (2m net) 5. bird observations ??? 6. along track measurements of temp, salinity and fluorescence Sampling West Coast of Antarctic Peninsula including near Palmer and LTER grid. Grid coverage for hydrography including lines 900 inshore, 800, 700, 600, 500, 400, 300, 200, 100, inshore aand 900 offshore. See LTER general information. Rapid shipboard sampling within the entire large scale LTER grid. See individual data sets. Core measurments available two years after the cruise. Citation acknowledgement: "Data from the Palmer LTER data archive were supported by Office of Polar Programs, NSF (OPP-9011927)." antarctic, southern ocean, bio-optics, phytoplankton, krill, marginal ice zone ~lter/data/93mar/* Hoffmann, EE, DA Smith, RA Locarnini, 1993. Palmer LTER: Hydrography in the LTER Region. Antarctic Journal of the United States 28(5):209-211. Houlihan, T and DM Karl, 1993. Palmer LTER: Dissolved Silicic Acid-Nitrate Relationships during Austral Autumn 1993. Antarctic Journal of the United States 28(5):219-221. Quetin, LB, RM Ross, and KS Baker: Palmer LTER: An Overview of the 1992-1993 Season. Antarctic Journal of the United States: 28(5):205-208. Smith DA, RA Locarnini, BL Lipphardt, Jr., EE Hofmann: Hydrographic data collected aboard R/V Nathaniel B. Palmer March-May 1993. CCPO Technical Report No. 93- 04, Crittenton Hall, Old Dominion University, Norfolk, VA 23529. 1993. SIO Reference No. 93-43. Smith DA, RC Smith, D Menzies: Oceanographic data col- lected aboard RV Nathaniel B Palmer March-May 1993. CCPO Technical Report No. 93-05, Crittenton Hall, Old Dominion University, Norfolk, VA 23529. 1993. SIO Reference No. 93-44. Smith DA, RA Locarnini, BL Lipphardt, Jr., EE Hofmann: XBT data collected aboard R/V Nathaniel B. Palmer March-May 1993. CCPO Technical Report No. 93-06, Crit- tenton Hall, Old Dominion University, Norfolk, VA 23529. 1993. SIO Reference No. 93-45. National Science Foundation, Division of Polar Programs 10June93 07Dec93-ksb 26Apr96-ksb Raymond C. Smith Robin M. Ross Langdon B. Quetin

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