Geostrophic currents in the Antarctic zone of the Indian Ocean

• Main Authors: Keiji Nasu, Mikio Naganobu
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 1981
• Subjects: Geography (General); G1-922; Antarctic; Indian; The Antarctic; Antarc*
• Online Access: https://doi.org/10.15094/00008260; https://doaj.org/article/c1940f5637fb45d1b7d35b5733003248

The research ship KAIYO MARU (Jap. Fish. Agency) occupied 36 oceanographic stations between 61°and 65°S and between 110°and 120°E during the period from January 13 to 29,1980. Dynamic topography and corresponding currents were computed with reference to the 1500-decibar surface. Eastward flow is dominant in the survey area, including the cyclonic and anticyclonic eddies in the area between 62°and 63°20'S and between 105°and 110°E. Cyclonic and anticyclonic circulations are also existing along 120°E. A strong meandering of eastward flow is recognized south of 63°S, which must be influenced by the bottom configuration. The velocity of geostrophic current, relative to the 1500-decibar surface, north of 64°20'S in the survey area gradually decreased toward the deep layer. But it increased south of 64°20'S, giving a maximum of 2.6cm s^<-1> at 300-400m in depth, while the surface velocity is 0.3cm s^<-1>.