WHP Ref. No.: PR6 Last Updated: 12 April, 1996 A. Cruise Narrative A.1 Highlights A.1.a WOCE designation PR06 A.1.b EXPOCODE 18DD9601/1 A.1.c Chief Scientist Frank Whitney Institue of Ocean Sciences PO Box 6000 9860 West Saanich Road Sidney, B.C. V8L-4B2 Phone: 604-363-6807 Fax: 604-363-6816 A.1.d Ship John P. Tully A.1.e Ports of call None A.1.f Cruise dates February 19 to March 8, 1996 A.2 Cruise Summary Information A.2.a Geographic boundaries Line PR6 starts at the mouth of Juan de Fuca Strait on the west coast of Canada, and heads almost due west for 900 n mi. The terminal station is PRS1, formerly designated Ocean Weather Station Papa (50 N, 145 W). A.2.b Stations occupied Table of Stations by type Sample type: No. stations: Max. depth (m): ----------------------------------------------- CTD casts 27 4300 db Rosette/Hydro casts 4 4200 Loop samples 31 5 Profiling Alace float 1 800 Surface drifters 2 20 ------------------------------------------------ A.2.c Floats and drifters deployed A profiling Alace float was deployed at station PRS1. Surface drifters that collect temperature and barometric pressure data were deployed at stations P20 and PRS1 for the Department of the Environment. A.2.d Moorings deployed or recovered A.3 List of Principal Investigators Principal Investigators ---------------------------------------------- Howard Freeland Ocean circulation IOS C.S. Wong Climate chemistry IOS Frank Whitney WOCE coordinator IOS Philip Boyd JGOFS coordinator UBC ---------------------------------------------- A.4 Scientific Programme and Methods Our repeat hydrography section continues to be a joint program with Canadian JGOFS. A CTD survey along Line PR6 was completed, except for 2 stations which were omitted due to weather. Salinity, oxygen and nutrients (NO3 & NO2, PO4 and Si) were analyzed onboard ship from rosette casts at 4 stations. DMS was analyzed in sea water, to a depth of 400 m. A profiling Alace float (T/S/P), ballasted to rest at 800 m, was deployed near station PRS1 (Ocean Station Papa). Near the current location of an Alace float that was launched in September 1995, we took a CTD cast to check for sensor drift. JGOFS participants collected samples for biomass estimates at 4 stations, and incubated water to measure growth and grazing rates of various groups of plankton. A large volume in situ pumping system (J. Bishop) was successfully deployed only at station PRS1. Typical winter conditions were encountered along Line PR6. Optical measurements indicate that biomass in the surface was higher at PRS1 than nearer the coast. A current meter positioned deep in the mixed layer at PRS1 recorded the breakdown of the summer thermocline in mid-October. Temperature abruptly increased as heat was mixed into the surface layer. Goals Achieved: CTD survey of Line PR6, minus 2 stations . Successful Rosette casts at 4 stations on Line P. Completion of JGOFS sampling for plankton and productivity measurements. One large volume pump station at PRS1 for particulates. A mooring with an optical package and S4 current meter, both in the mixed layer, was recovered and redeployed. A.5 Major Problems and Goals not Achieved Less water sampling and pumping was completed than had been planned, due to poor weather. A ground fault limited the work completed with the pumping system. The optical instrument on the mooring failed. No useful data was recovered from it. A.6 Other Incidents of Note A.7 List of Cruise Participants Cruise Participants & Affiliations Name Responsibility Institution -------------------------------------------------------------------- Frank Whitney Nutrients, watch IOS Bernard Minkley Oxygen, watch IOS Nick Hall-Patch Salts, watch IOS Wendy Richardson DMS, watch IOS Tim Soutar Watch, pCO2 IOS Ron Bellegay Watch, carbonates IOS Philip Boyd Phytoplankton UBC Robert Goldblatt Zooplankton biomass UBC Hugh Maclean Watch, plankton sampling UBC Nelson Sherry Bacteria UBC Maureen Soon particulate 13C & 15N UBC Suzanne Roy Zooplankton excretion Rimouski U. Ken Crocker Zooplankton grazing Memorial U. Jennifer Putland Micro-zooplankton Memorial U. Jim Bishop pump sampling U. Victoria Todd Mudge pump sampling U. Victoria Stacey Cooper pump sampling U. Victoria -------------------------------------------------------------------- IOS= Institue of Ocean Sciences, Sidney, B.C., Canada. UBC=University of British Columbia, Vancouver, B.C., Canada