WHP Ref. No.: S4I Last Updated: 18 October, 1996 Initial Cruise Report 1. Highlights a. WOCE cruise S4(Indian) b. EXPOCODE: 320696/3 c. co-chief scientists: Thomas Whitworth III Department of Oceanography Texas A&M University College Station, TX, 77843 (409) 845-5872 fax: 847-8879 twhitworth@tamu.edu James H. Swift Scripps Institution of Oceanography La Jolla, CA 92093 (619) 534-3387 fax: 534-7383 jswift@ucsd.edu d. Ship: RVIB N.B. Palmer e. Ports: Cape Town, South Africa to Hobart, Australia f. Dates: 3 May - 4 July, 1996 2. Cruise Summary Information a. The cruise constituted the Indian Ocean portion of WOCE line S4, a meridional circumnavigation of Antarctica at a nominal latitude of 60S. This segment covered the longitudes 20E to 120E. b. Total stations: 108 full-depth CTD/rosette c. Floats deployed: 17 ALACE ser# mo/day time latitude longitude ------------------------------------------------------- 628 5/4 2056Z 47-59.4S 19-12.0E 346 5/5 0610Z 38-59.1S 21-46.4E 629 5/5 1546Z 39-59.1S 21-46.1E 559 5/5 2118Z 40-59.4S 21-42.2E 634 5/6 0228Z 41-58.8S 21-38.5E 566 5/5 1040Z 43-29.9S 21-32.9E 604 5/6 2042Z 44-59.9S 21-27.3E 640 5/13 1118Z 45-59.9S 19-06.5E 605 5/13 1651Z 47-00.0S 19-09.7E 641 5/13 2221Z 47-59.4S 19-12.0E 642 5/14 0700Z 49-32.6S 19-16.5E 643 5/14 1458Z 50-59.8S 19-20.7E 607 5/14 2045Z 51-58.7S 19-23.8E 644 5/15 0224Z 52-59.8S 19-26.4E 608 5/15 1035Z 54-30.0S 19-31.7E 645 5/15 1855Z 55-59.4S 19-47.2E 609 5/16 0331Z 57-30.0S 19-58.6E d. Moorings deployed: 9 self-reporting current meters ser# Time/Date Latitude Longitude depth ------------------------------------------------------ 26935 0732Z 5/28 65-22.8S 53-14.2E 1740m 26939 1125Z 5/28 65-14.0S 53-06.5E 1900m 26936 1904Z 5/28 65-07.0S 52-59.6E 2260m 26937 1706Z 6/6 59-42.9S 84049.9E 2020m 26941 2209Z 6/6 59-40.6S 85-07.9E 3080m 26943 2231Z 6/6 59-40.3S 85-10.9E 4225m 26944 1331Z 6/16 64-03.8S 92-21.5E 3275m 26938 0614Z 6/19 63-00.0S 85-00.0E 3058m 26940 1212Z 6/19 62-59.6S 84-31.5E 2740m 3. Principal Investigators CTD/Hydrography Jim Swift (Scripps) CFCs Bill Smethie (LDEO)/Mark Warner(UW) He, Tritium, O-18 Peter Schlosser (LDEO) CO2 Taro Takahashi (LDEO) Alkalinity Frank Millero (Miami) Radiocarbon Bob Key (Princeton) Current meters Worth Nowlin, Thomas Whitworth (TAMU) Transmissometer Wilf Gardner (TAMU) ADCP/LADCP Eric Firing, Peter Hacker (Hawaii) 4. Narrative Station 1 was occupied at 58S, 20E and the first station line was run southeast to Gunnerus Ridge, about 50 miles south of the ice edge. During the transit to station 1 and continuing to 58S, 17 ALACE floats were launched. Stations across the Enderby Abyssal Plain trended east-northeast from 66S at 33E, to 61S at 83E on the Kerguelen Plateau. A line of stations was made north from the 500-m isobath on the continental slope at 53E, and three self-reporting current meters were deployed along the slope. A line of stations extending east from the crest of the Kerguelen Plateau was made at about 59S, and three more current meters were deployed. On June 8, science operations were suspended for seven days when the Palmer was diverted to Mirnyi Station in the Davis Sea to deliver emergency food supplies. On June 14, the Palmer left Mirnyi and began a line of stations north from the shelf break of the Davis Sea during the return trip to Kerguelen Plateau. One current meter was deployed near the 3000-m isobath north of the Antarctic Continent, and two more near the 3000-m isobath at the southern end of Kerguelen Plateau. The zonal line at a nominal latitude of 62S was resumed at 90E and terminated at 120E. 5. Major Problems On Sunday, 12 May, a third CTD test cast was being recovered when a sudden wave lifted the rosette out of the water and then dropped it. The wire parted at the sheave, and the entire package was lost. The only piece of equipment without back-up was the lowered ADCP unit belonging to the University of Hawaii. 6. Other incidents of note At 0330 on 7 May, the Palmer turned back toward South Africa to seek medical attention for a crew member. The ship was diverted to the naval base at Simonstown where fuel was available, and the morning and afternoon of May 10 were spent getting the crewman treated and refueling. 7. Cruise Participants Name AffiliationDuties --------------------------------------------------------------- Isabelle Ansorge UCT CTD console, sampling, salts Dee Breger LDEO 3He, tritium, O-18 Christie Campbell ASA rosette, sampling, salts, Hazmat. Kent Chen ASA sampling, NBP computers, salts David Chipman LDEO CO2 Scott Colburn ASA sampling, NBP ET, bathymetry Steve Covey UW CFCs Frank Delahoyde STS,ODF CTD data, bottle data, computers Craig Hallman STS,ODF Oxygen, rosette, salts Leonard Lopez STS,ODF Oxygen, rosette Robert Key Princeton Gadfly,14C Guy Mathieu LDEO CFCs Carl Mattson STS,ODF TIC, Watch Leader,ET, rosette Rod McCabe ASA sampling, NBP computers Manfred Mensch LDEO CFCs Stacey Morgan STS,ODF nutrients Jim Noyes SIO CTD console, sampling Alejandro Orsi UW ADCP, CTD console, sampling, data Ron Patrick STS,ODF Watch Ldr, O2, rosette, bottle data Esa Peltola UM Alkalinity Erik Quiroz TAMU nutrients Blaine Reynolds ASA sampling, NBP ET, bathymetry Stephany Rubin LDEO CO2 Steve Rutz TAMU ADCP, CTD console, sampling, data Buzz Scott ASA rosette, sampling, salts, NBP MT Colm Sweeney LDEO CO2 James Swift SIO Co-Chief Sci., bottle data, rosette Mark Talkovic ASA rosette, sampling, salts, NBP MT Thomas Whitworth TAMU Chief Scientist Kevin Wood ASA ASA MPC, sampling