*********** 020794B.PHY *********** Contributory Categories: CHM, SAT Country: Japan From: Preliminary Abstracts from CREAMS Symposium Jan 1994 Courtesy of Prof. Takematsu, Kyushu University KEYWORDS: Japan, Circulation, CREAMS-93 cruise, Isotopes, Oceanographic equipment, Sea of Japan, Water chemistry +++++ CREAMS'94 SYMPOSIUM ABSTRACTS CREAMS'93 EXPERIMENTS A l: REPORT ON CREAMS'93 Masaki Takematsu (Kyushu University, Japan) As part of the CREAMS Program, we performed a basin-wide observation of the Japan Sea/East Sea in August 1993 on board a Russia (FEHMI) R/V "Prof Khromov", with a total of 29 participants from Russia, Korea and Japan. The major objective of the cruise was to gather a new data set for understanding the entire current structure in this "miniature ocean". An outline of the cruise is indicated in Fig. l. (Fig. can not be transmitted) The observations contained the following items ; CTD cast (0-1,000 m), deployment of 2 ARGOS drifters, water samplings for chemical tracer study, measurements of partial pressures of CFC-12 and nitrous oxide in the marine air and surface water and current mesurements by a towing ADCP. Results from these observations will be described in the subsequent presentations. On the cruise we deployed three subsurface moorings in order to survey the deep circulation in the Japan Sea Proper Water. Eacti niooring is equipped with a total of three current meters (Aanderaa RCM-8) at nominal depths 1,000m, 2,000m and 3,000m. The moorings will be kept in the sea for about one year to detect seasonal variability (if any) in the water mass. A 2: CTD AND SATELLITE DRIFTER PROGRAMME FOR CREAMS'93 Kuh Kim(1), Young-Gyu Kim(1), Yang-Ki Cho(1), Byung Ho Choi(2), Young Bok Kim(2), Cheol-Ho Kim(3), Jong-Hwan Yoon(3), Sang Chul Hwan(4), Hong-Ryul Shin(4) , Alexsey Scherbinin(5) and Sergey Yarosh(5) (1) Seoul National University, Korea (2) Sung Kyun Kwan Uinvsity, Korea (3) Kyushu Univsity, Japan (4) Korea Ocean Research and Development Institute, Korea (5) Far Eastern Hydrometeorological Institute, Russia During CREAM'93 cruise 71 CTD (SeaBird Model 25) stations were taken to a noninial depth of 1000 m. In the Ulleung Basin a warm (T>10 C) and saline (S>34.2 ppt.) water is located in the upper 200 m and a layer of salinity, miniimum (S<34.0 ppt.) is found at 300 m. In the Yamato Basin a core of high salinity (S=34.5 ppt.) is located at 50 m approximately, below which salinity decreases gradually. In the Japan Basin a 20 m deep, thin layer of a low salinity (S<33.6 ppt.) is found above the seasonal thermocline. Below this layer has a weak-maximum of salinity. The salinity minimum layer in the Japan Basin is found at most stations in the southwestern part, but very few elsewhere. The dynamic topography at 5 db relative to 700 db shows a cyclonic circulation north of the polar front. Two drifters deployed near the Siberian coast on August 18 and 24 moved about 300 km southwestward until the end of September with mean speeds of 7.8 cm/sec and 13.0 cm/sec. In October they turned southward with meandering motions at a reduced speed. A3: INITIAL REPORT ON CREAMS'93 - CHEMICAL ASPECTS Kyung-Ryul Kim(1), Sang-Hwa Choi(1), Kwang-Seok Park(1), Jeom- Shik Hwang(1), Gi Hoon Hong(2) , and Dong-Jin Kang(2) (1) Seoul National University, Korea (2) Korea Ocean Research and Development Institute, Korea) During CREAMS'93 Expedition for East Sea (Japan Sea) on Board R/V Professor Khromov, 40 stations were occupied for sea water sampling. With a 5 liter Rosette sampler, samples were collected at 10 - 12 depths from surface to around 500 m on the average at each station. At 20 stations, 60 liter large-volume samples were also taken for surface waters to study radioactive isotopes such as 137CS and 210Pb. Additional large-volume samplings at 150 m and 300 m depths were also carried out at 6 stations. Besides, pCFC-12 and pN20 in marine air and surface seawater were continuously measured along the cruise track. Nutrients, DO and pH were measured on board and other constituents including 137CS, del O^18 etc, are currently being measured at the laboratory. Preliminary analysis on inital nutrients for upper proper waters in Japan, Yamato and Ulleung Basins shows rather homogeneous nature, suggesting a similar origin for these waters. Results for stable and radioactive isotopes will be further discussed at the meeting. A 4: REPORT OF ADCP SURVEY IN CREAMS'93 Yutaka Isoda(1) and Atsuhko Isobe(2) (1) Ehime University, Japan (2) Shimonoseki University of Fisheries, Japan Extensive mapping observation of upper circulation in the Japan/East Sea using the towed-type ADCP (Acoustic Doppler Current Profiler), "EIKO" which was developed by RIAM (Research Institute for Applied Mechanics, Kyushu University), was carried out on 13- 29 August, 1993. The EIKO was towed with an about 70m rope from the R/V "Prof Khromov" and was designed to move through a water at several meters below the sea surface at ship speeds of 6-8 knots. The ADCP sampled velocities relative to the ship every minute with a depth bin of 8 m. The ship position was also measured every mniute by GPS (Global Positioning System). B 1: REVIEW OF RUSSIAN INVESTIGATIONS OF THE JAPAN SEA CURRENTS Mikhail Danchenkov (Far Eastern Hydrometeorological Institute, Russia) ABSTRACT NOT RECEIVED B 2: SOFAR FLOAT TRACKING IN JAPAN SEA Keisuke Taira University of Tokyo, Japan) IN JAPANESE B 3[FLYING FISH] A TOWED VEHICLE SYSTEM FOR PHYSICAL AND CHEMICAL MEASUREMENTS IN OCEAN UPPER MIXED LAYER Wataru Koterayama and Satoru Yamaguchi (Kyushu University, Japan) A motion controllable towed vehicle housing an acoustic Doppler current profiler, CO2, analyzer and sensors for other physical and chemical measurements in the upper ocean mixed layer is being developed. Length of the towed vehicle is 3.84 m, breath is 2.26 m, height 1.4 m and weight in air is 1000 kg, and the maximum submersible depth is designed as 200 m which is enough to research the ocean mixed layer. The data obtained are sent through a towing cable and analyzed by computer in real time on the mother ship. ************** END Msg. B.PHY **************