TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 59 (No. 1), pp. 119-127, 2003

Short Contribution

Pre-Japan-ARGO: Experimental Observation of Upper and Middle Layers South of the Kuroshio Extension Region Using Profiling Floats

Naoto Iwasaka1,2*, Toshio Suga1,3, Kensuke Takeuchi1, Keisuke Mizuno4, Yasushi Takatsuki4, Kentaro Ando4, Taiyo Kobayashi1, Eitarou Oka1, Yasuko Ichikawa1, Motoki Miyazaki1, Hiroshi Matsuura1, Kenji Izawa4, Chan-Su Yang1, Nobuyuki Shikama1 and Momoko Aoshima2

1Frontier Observational Research System for Global Change, Natsushima, Yokosuka 237-0061, Japan
2Tokyo University of Mercantile Marine, 2-1-6 Etchujima, Koto-ku, Tokyo 135-8533, Japan
3Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
4Japan Marine Science and Technology Center, Natsushima, Yokosuka 237-0061, Japan

(Received 18 February 2002; in revised form 9 May 2002; accepted 15 May 2002)

Abstract: We deployed two profiling floats in the region south of the Kuroshio Extension in March 2000. Temperature and salinity profiles from a depth of 1500 104 Pa to the surface are reported every two and four weeks, respectively. The floats performed very well for first four months after deployment. Later they failed in surfacing for a few months when the sea surface temperature in the region was high. The salinity sensors seemed to suffer from some damage during their failure-in-surfacing period. Despite this trouble, the results clearly demonstrate that the profiling float is a very useful and cost-effective tool for physical oceanographic observation in the open sea.

*Corresponding author E-mail: iwasaka@ipc.tosho-u.ac.jp

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