Abstract
Hydrographic casts down to the bottom along two zonal sections at 12°N and 13°N (from 144°E to 127°E) were made with a CTD. Their analysis verified the existence of cold and saline abyssal water between the Mariana Ridge and the Kyushu-Palau Ridge. This result provides evidence of flow into the Philippine Sea through the deep gap called the Yap-Mariana Junction. The properties of deep water are variable in the West Mariana basin but quite homogeneous in the Philippine Basin, indicating the transitional nature in the West Mariana Basin and the existence of older bottom water in the Philippine Basin. A close examination suggests that the bottom water is slightly colder in the western part of the Philippine Basin than in the eastern part of the basin. This slightly colder deep water with a hundred kilometer scale in the western Philippine Basin might be related to a broad western boundary current flowing equatorward along the eastern rise of the Philippine Trench.
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References
Fofonoff, N.P. and R.C. Millard (1983): Algorithms for computation of fundamental properties of sea-water. Unesco technical papers in marine science,44, 53 pp.
Fukasawa, M. (1988): CTD data processing. Priority Area Programme, Dynamics of the Deep Ocean Circulation: News Letter, No. 4, 9–15 (in Japanese).
Kaneko, I. (1984): Structure of mid-depth water in the Philippine Sea. Ph. D. Thesis, University of Tokyo, Tokyo, 97 pp.
Kaneko, I. and T. Teramoto (1985): Sea Water Exchange between the Shikoku-Philippine Basin and the western North Pacific Basin. p. 54–77.In: Ocean Characteristics and their Changes, ed. by K. Kajiura, Kouseisha-Kouseikaku (in Japanese).
Kubota, M. and H. Ono (1989): Numerical modeling on deep circulation in the Philippine Sea. Priority Area Programme, Dynamics of the Deep Ocean Circulation: News Letter, No. 7, 3–7 (in Japanese).
Mantyla, A.W. and J.L. Reid (1983): Abyssal characteristics of the World Ocean waters. Deep-Sea Res.,30, 805–833.
Moriyasu, S. (1972): Deep waters in the Western North Pacific. p. 387–408.In: Kuroshio: It's physical aspects, ed. by H. Stommel and K. Yoshida, University of Tokyo Press, Tokyo.
SCOR Working Group 51 (1988): The acquisition, calibration, and analysis of CTD data. Unesco technical papers in marine science,54, 94 pp.
Stommel, H. and A.B. Arons (1960): On the abyssal circulation of a world ocean—II. An idealized model of the circulation pattern and amplitude in oceanic basins. Deep-Sea Res.,6, 217–244.
Teramoto, T. and K. Taira (1988): Preliminary Report of The Hakuho Maru Cruise KH-87-1. Ocean Research Institute, University of Tokyo, 139 pp.
Uehara, K. (1990): Abyssal circulation in the Philippine Sea. M.S. Thesis, University of Tokyo, Tokyo, 38 pp. (in Japanese).
Warren, B.A. (1981): Deep circulation of the world ocean. p. 6–41.In: Evolution of Physical Oceanography, ed. by B.A. Warren and C. Wunsch, MIT Press, Cambridge.
Warren, B.A. (1983): Why is no deep water formed in the North Pacific? J. Mar. Res.,41, 327–347.
Watanabe, S., S. Noriki, C. Saitoh and Y. Watanabe (1988): Distribution of chemical tracers in the Philippine Sea. p. 30–34.In: Preliminary Report of The Hakuho Maru Cruise KH-87-1, ed. by T. Teramoto and K. Taira, Ocean Research Institute, University of Tokyo.
Yoshioka, N., M. Endoh and H. Ishizaki (1988): Observation of the abyssal current in the West Mariana Basin. J. Oceanogr. Soc. Japan,44, 33–39.
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Uehara, K., Taira, K. Deep hydrographic structure along 12°N and 13°N in the Philippine Sea. Journal of the Oceanographical Society of Japan 46, 167–176 (1990). https://doi.org/10.1007/BF02125577
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DOI: https://doi.org/10.1007/BF02125577