Abstract
During November 2000–June 2002, both direct current measurements from deployment of a line of five moorings and repeated CTD observations were conducted along the Oyashio Intensive observation line off Cape Erimo (OICE). All the moorings were installed above the inshore-side slope of the Kuril-Kamchatka Trench. Before calculating the absolute volume transports, we compared vertical velocity differences of relative geostrophic velocities with those of the measured velocities. Since both the vertical velocity differences concerned with the middle three moorings were in good agreement, the flows above the continental slope are considered to be in thermal wind balance. We therefore used the current meter data of these three moorings, selected among all five moorings, to estimate the absolute volume transports of the Oyashio referred to the current meter data. As a result, we estimated that the southwestward absolute volume transports in 0–1000 db are 0.5–12.8 × 106 m3/sec and the largest transport is obtained in winter, January 2001. The Oyashio absolute transports in January 2001, crossing the OICE between 42°N and 41°15′ N from the surface to near the bottom above the continental slope, is estimated to be at least 31 × 106 m3/sec.
Similar content being viewed by others
References
Cokelet, E. D., M. L. Schall and D. M. Dougherty (1996): ADCP-referenced geostrophic circulation in the Bering Sea Basin. J. Phys. Oceanogr., 26, 1113–1128.
Dodimead, A. J., F. Favorite and T. Hirano (1963): Review of the oceanography of the Subarctic Pacific Region. Int. North Pac. Fish. Comm. Bull., 13, 1–195.
Favorite, F., A. J. Dodimead and K. Nasu (1976): Oceanography of the Subarctic Pacific Region, 1960-1970. Int. North Pac. Fish. Comm. Bull., 33, 1–187.
Isoguchi, O., H. Kawamura and T. Kono (1997): A study on wind-driven circulation in the subarctic North Pacific using TOPEX/POSEIDON altimeter data. J. Geophys. Res., 102, 12457–12468.
Kawasaki, Y., T. Kono, M. Kashiwai and K. Okuda (1991): Dynamic structure of the Oyashio I. Net geostrophic transport balance and flow path of the Oyashio Water during summer in 1989. Bull. Hokkaido Natl. Fish. Res. Inst., 55, 79–89 (in Japanese and English abstract and figure captions).
Kono, T. (1997): Modification of the Oyashio Water in the Hokkaido and Tohoku Areas. Deep-Sea Res. I, 44, 669–688.
Kono, T. and Y. Kawasaki (1997): Modification of the western subarctic water by water exchange with the Okhotsk Sea. Deep-Sea Res. I, 44, 689–711.
Kutsuwada, K. (1982): New computation of the wind stress over the North Pacific Ocean. J. Oceanogr. Soc. Japan, 38, 159–171.
Nagata, Y., K. Ohtani and M. Kashiwai (1992): Subarctic gyre in the North Pacific Ocean. Umi no Kenkyu, 1, 75–104 (in Japanese with English abstract and figure captions).
Ohtani, K. (1970): Relative transport in the Alaskan Stream in winter. J. Oceanogr. Soc. Japan, 26, 271–282.
Ohtani, K. (1989): The role of the Seas of Okhotsk on the formation of the Oyashio Water. Umi to Sora, 65, 63–83 (in Japanese with English abstract and figure captions).
Onishi, H. and K. Ohtani (1999): On seasonal and year to year variation in flow of the Alaskan Stream in the central North Pacific. J. Oceanogr., 55, 597–608.
Reed, R. K. (1984): Flow of the Alaskan Stream and its variations. Deep-Sea Res., 31, 369–386.
Roden, G. I. (1995): Aleutian Basin of the Bering Sea: Thermohaline, oxygen, nutrient, and current structure in July 1993. J. Geophys. Res., 100, 13539–13554.
Sekine, Y. (1999): Anomalous southward intrusion of the Oyashio east of Japan 2. Two-layer numerical model. J. Geophys. Res., 104, 3049–3058.
Shimizu, Y., I. Yasuda and S. Ito (2001): Distribution and circulation of the coastal Oyashio intrusion. J. Phys. Oceanogr., 31, 1561–1578.
Shimizu, Y., I. Yasuda, K. Okuda, K. Hanawa and S. Ito (2003): ADCP-referenced Kuroshio and Oyashio Water transports for North Pacific Intermediate Water formation. J. Phys. Oceanogr., 33, 220–233.
Stabeno, P. J. and R. K. Reed (1994): Circulation in the Bering Sea Basin observed by satellite-tracked drifters: 1986-1993. J. Phys. Oceanogr., 24, 848–854.
Stabeno, P. J., R. K. Reed and J. E. Overland (1994): Lagrangian measurements in the Kamchatka Current and Oyashio. J. Oceanogr., 50, 653–662.
Talley, L. D., Y. Nagata, M. Fujimura, T. Iwao, T. Kono, D. Inagake, M. Hirai and K. Okuda (1995): North Pacific Intermediate Water in the Kuroshio/Oyashio mixed water region. J. Phys. Oceanogr., 25, 475–501.
Uehara, K. and H. Miyake (1996): The response of the Oyashio southeast off Cape Erimo to seasonal variations of the wind. Umi to Sora, 72, 21–29 (in Japanese with English abstract and figures captions).
Uehara, K. and H. Miyake (1999): Deep flows on the slope inshore of the Kuril-Kamchatka Trench southeast off Cape Erimo, Hokkaido. J. Oceanogr., 55, 559–573.
Uehara, K. and H. Miyake (2000): Biweekly periodic deep flow variability on the slope inshore of the Kuril-Kamchatka Trench. J. Phys. Oceanogr., 30, 3249–3260.
Uehara, K., H. Miyake and M. Okazaki (1997): Characteristics of the flows in the Oyashio area off Cape Erimo, Hokkaido, Japan. J. Oceanogr., 53, 93–103.
Verkhunov, A. V. and Y. Y. Tkachenko (1992): Recent observations of variability in the Western Bering Sea Current Systems. J. Geophys. Res., 97, 14369–14376.
Warren, B. A. and W. B. Owens (1988): Deep currents in the central subarctic Pacific Ocean. J. Phys. Oceanogr., 18, 529–551.
Yasuda, I. (1997): The origin of the North Pacific Intermediate Water. J. Geophys. Res., 102, 893–909.
Yasuda, I., K. Okuda and Y. Shimizu (1996): Distribution and modification of the North Pacific Intermediate Water in the Kuroshio-Oyashio interfrontal zone. J. Phys. Oceanogr., 26, 448–465.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Uehara, K., Ito, SI., Miyake, H. et al. Absolute Volume Transports of the Oyashio Referred to Moored Current Meter Data Crossing the OICE. Journal of Oceanography 60, 397–409 (2004). https://doi.org/10.1023/B:JOCE.0000038224.77418.91
Issue Date:
DOI: https://doi.org/10.1023/B:JOCE.0000038224.77418.91