R/V Shumpu Maru Cruise SU9409 1 Cruise Narrative 1.1 Highlights Expedition Designation Shumpu Maru Cruise SU9409 Chief Scientists Leg 2:Tadayoshi UTUNOMIYA, Kobe Marine Observatory(KMO) Ship R/V Shumpu Maru Ports of Call Leg 2:Kochi to Kochi Cruise Dates Leg 2:October 1 to October 6,1994 1.2 Cruise Summary The cruise track and station locations of leg 2 are shown in Figure 1. The ship departed Kochi on October 1,1994, and made 6 CTD/rosette stations of a section PR17. 3 XBT stations were made between CTD/rosette stations. To first CTD/rosette station the ship reached at 2058 UTC on October 3, from last station departed at 0240 UTC on Octorber 5. The CTD is EG&G NBIS Mark III B(6500 db type,no oxygen sensor). Water samples were collected from 1.7 liter Niskin bottles mounted on the General Oceanics Rosette multisampler. However, surface water samples were collected by a bucket. 1.3 List of Principal Investigators The principal investigators for all the parameters measured on the cruise are listed in Table 1. Table 1: Principal Investigators for All Measurements Name Responsibility Affiliation Kouji KADONO Oxygen, Nutrients KMO Tadayoshi UTUNOMIYA CTD, S KMO 1.4 List of Cruise Participants The cruise participants for leg 2 are listed in Table 2. Table 2: Cruise Participants for leg 2 Name Responsibility Affiliation Tadayoshi UTUNOMIYA Chief Scientist KMO CTD Hardware Kouji KADONO Oxygen, Nutrients KMO Akira NAKADATE Oxygen, Nutrients KMO Satoshi SUGIMOTO CTD Software KMO Syuji TUBAKI Oxygen, Nutrients KMO Kouji HAYASHI Watch Stander KMO Keiichi SATO Watch Stander KMO Hiroki SUZUKI Watch Stander KMO Kiyoshi MURAKAMI Watch Stander KMO 2 Measurement Techniques and Calibrations 2.1 CTD The CTD is EG&G NBIS Mark III B(6500 db type, no oxygen sensor). A HP 9000 Series 300 model 330(Hewlett Packard) with a 4 MByte of memory was used as the primary data collection device. The temperature and pressure sensor were calibrated at the calibration facility of S¥E¥A CO., LTD before the cruise. The results are shown in Table 3. Temprature and pressure(increasing) calibration values are used to correct CTD data, by linear interpolatin inside the the calibrated regime. CTD data outside of the regime is corrected by the calibration values on the boundary, at the each side. Notice that the upcast pressure data is corrected by Pressure(increasing), not Pressure(decreasing) in Table 3. Table 3: The temperature and pressure sensor calibration values Temperature(Caliblated on September 22, pre-creise) Standard Temperature CTD Temperature Difference 1.0047 1.0014 0.0033 2.0030 1.9996 0.0034 3.0033 3.0002 0.0031 4.0031 4.0004 0.0027 5.2502 5.2477 0.0025 7.4367 7.4344 0.0023 9.9995 9.9973 0.0022 Pressure(increasing, Caliblated on September 21, pre-cruise) Standard Pressure CTD Pressure Difference 0.0 -0.5 0.5 98.0 96.9 1.1 293.9 293.1 0.8 489.8 490.6 -0.7 979.7 984.5 -4.8 1959.4 1967.1 -7.7 2939.1 2946.2 -7.1 3918.7 3925.1 -6.4 4898.4 4905.3 -9.8 5878.1 5887.0 -8.9 Pressure(decreasing, calibiated on September 28, pre-cruise) Standard Pressure CTD Pressure Difference 0.0 1.8 -1.8 98.0 101.5 -3.6 293.9 299.2 -5.3 489.8 497.1 -7.3 979.7 989.8 -10.1 1959.4 1969.2 -9.8 2939.1 2946.7 -7.7 3918.7 3925.0 -6.3 4898.4 4905.1 -6.6 5878.1 5887.0 -8.9 The conductivity sensor were calibrated at sea using data from the analyses of salinity collected at 4 stations. The salinometer is AUTOSAL 8400B(Guildline) for the analyses of salinity of the water samples.The results are shown in Table 4. The calibration constant is determined assuming that the bias 0. Table 4: The conductivity sensor calibration constants Bias Slope 0 1.00000 The temperature of "SU9409.SEA" and "SU9409.CTD" files is described with the international temperature scale of 1990, ITS-90. 2.2 Oxygen Measurements The determination of dissolved oxygen was done by the modified version of the Winkler method described in "Kaiyo Kansoku Shishin (Manual of Oceanographic Observation)" published by the Oceanographical Society of Japan(1970). No estimation of accuracy and precision and reagent blank has been done. 2.3 Nutrients Analyses The nutrients analyses were done by the Technicon Auto Analyzer II described in "Kaiyo Kansoku Shishin (Manual of Oceanographic Observation)" published by the Oceanographical Society of Japan(1970). No estimation of accuracy and precision has been done.