Neogloboquadrina incompta is an optimal marker of the transitional water formed by mixing of the warm Tsushima Current with cold waters of the Japan Sea. Spatial and temporal changes in N. incompta distribution have been analysed to reconstruct the timing and processes by which modern surface-water conditions were established in the Japan Sea as a function of postglacial influx of the Tsushima Current resulting from rising sea levels. The spatiotemporal distribution of N. incompta suggests that transitional water formed in the eastern to southern marginal regions of the Japan Sea prior to the deposition of the K-Ah tephra (7.3 cal. kyr BP) and then expanded southwestward. A northern cold water mass, together with the cold Liman Current, affected the southwestern part of the Japan Sea until 6.9 cal. kyr BP, which may have been a result of the weaker influence of the Tsushima Current during a time of lower sea level.
Broecker, W.S., Andree, M., Bonani, G., Wolfli, W., Klas, M., Mix, A. and Oeschger, H.1988: Comparison between radiocarbon ages obtained on coexisting planktonic foraminifera. Paleoceranography3, 647—57.
2.
Domitsu, H. and Oda, M.2005: Japan Sea planktic foraminifera in surface sediments: geographical distribution and relationships to surface water mass. Paleontological Research9, 255—70.
3.
Domitsu, H. and Oda, M.2006: Linkages between surface and deep circulations in the southern Japan Sea during the last 27,000 years: evidence from planktic foraminiferal assemblages and stable isotope records. Marine Micropaleontology61, 155—70.
4.
Domitsu, H., Shiihara, M., Torii, M., Tsukawaki, S. and Oda, M.2002: Tephrostratigraphy of the piston cored sediment KT96-17 P-2 in the southern Japan Sea — the eruption age of Daisen— Kusadanihara pumice (KsP). TheJournal of the Geological Society of Japan108, 545—56 (in Japanese with English abstract).
5.
Fairbanks, R.G.1989: A 17,000-year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation . Nature342, 637—42.
6.
Fukusawa, H.1995: Non-glacial varved lake sediment as a natural timekeeper and detector on environmental changes. Daiyonki-Kenkyu (The Quaternary Research) 34, 135—49 (in Japanese with English abstract).
7.
Gorbarenko, S.A. and Southon, J.R.2000: Detailed Japan Sea paleoceanography during the last 25 kyr: constraints from AMS dating and δ18O of planktonic foraminifera . Palaeogeography, Palaeoclimatology, Palaeoecology156, 177—93.
8.
Hase, H., Yoon, J.-H. and Koterayama, W.1999: The current structure of the Tsushima Warm Current along the Japanese coast. Journal ofOceanography55, 217—35.
9.
Hemleben, C., Spindler, M. and Anderson, O.R.1989: Modern planktonic foraminifera. Springer .
10.
Hughen, K.A., Baillie, M.G.L., Bard, E., Beck, J.W., Bertrand, C.J.H., Blackwell, P.G., Buck, C.E., Burr, G.S., Cutler, K.B., Damon, P.E., Edwards, R.L., Fairbanks, R.G., Friedrich, M., Guilderson, T.P., Kromer, B., McCormac, G., Manning, S., Ramsey, C.B., Reimer, P.J., Reimer, R.W., Remmele, S., Southon, J.R., Stuiver, M., Talamo, S., Taylor, F.W., van der Plicht, J. and Weyhenmeyer, C.E.2004: MARINE04 marine radiocarbon age calibration, 0—26 cal kyr BP. Radiocarbon46, 1059—86.
11.
Ikehara, K.2003: Late Quaternary seasonal sea-ice history of the northeastern Japan Sea. Journal of Oceanography59, 585—93.
12.
Isoda, Y. and Tanaka, K.1999: Interannual variations of bifurcation of the Tsushima Warm Current around the Tsushima/Korea Strait. Umi to Sora75, 71—79 (in Japanese with English abstract).
13.
Itaki, T., Ikehara, K., Motoyama, I. and Hasegawa, S.2004: Abrupt ventilation changes in the Japan Sea over the last 30 ky: evidence from deep-dwelling radiolarians. Palaeogeography, Palaeoclimatology, Palaeoecology208, 263—78.
14.
Katoh, O.1994a: Short-term fluctuations of the Tsushima Current in waters northwest of Yamaguchi Prefecture. Journal of Oceanography50, 51—64.
15.
——— 1994b: Structure of the Tsushima Current in the southwestern Japan Sea. Journal of Oceanography50, 317—38.
16.
Keigwin, L.D. and Gorbarenko, S.A.1992: Sea level, surface salinity of the Japan Sea, and the Younger Dryas event in the northwestern Pacific Ocean. Quaternary Research37, 346—60.
17.
Kim, J.-M., Kennett, J.P., Park, B.-K., Kim, D.C., Kim, G.Y. and Roark, E.B.2000: Paleoceanographic change during the last deglaciation, East Sea of Korea. Paleoceanography15, 254—66.
18.
Kitagawa, H., Fukusawa, H., Nakamura, T., Okamura, M., Takemura, K., Hayashida, A. and Yasuda, Y.1995: AMS 14C dating of varved sediments from Lake Suigetsu, central Japan and atmospheric 14C change during the late Pleistocene. Radiocarbon37, 371—78.
19.
Koizumi, I., Tada, R., Narita, H., Irino, T., Aramaki, T., Oba, T. and Yamamoto, H.2006: Paleoceanographic history around the Tsugaru Strait between the Japan Sea and the Northwest Pacific Ocean since 30 cal kyr BP . Palaeogeography, Palaeoclimatology, Palaeoecology232, 36—52.
20.
Lim, D.-B.1971: On the origin of the Tsushima Current water. The Journal of the Oceanological Society of Korea6, 85—91.
21.
Liu, J.P., Milliman, J.D., Gao, S. and Cheng, P.2004: Holocene development of the Yellow River's subaqueous delta North Yellow Sea. Marine Geology209, 45—67.
22.
Machida, H. and Arai, F.1978: Akahoya ash — a Holocene widespread tephra erupted from the Kikai Caldera, South Kyushu, Japan. Daiyonki-Kenkyu ( The Quaternary Research) 17, 143—63 (in Japanese with English abstract).
23.
——— 1983: Extensive ash falls in and around the Sea of Japan from large late Quaternary eruptions. Journal of Volcanology and Geothermal Research18, 151—64.
24.
Moriyasu, S.1972: The Tsushima Current. In Stommel, H. and Yoshida, K., editors, Kuroshio: its physical aspects. University of Tokyo Press, 353—69.
25.
Naganuma, K.1977: The oceanographic fluctuations in the Japan Sea . Kaiyo Kagaku9, 137—41 (in Japanese with English abstract).
26.
Oba, T., Kato, M., Kitazato, H., Koizumi, I., Omura, A., Sakai, T. and Takayama, T.1991: Paleoenvironmental changes in the Japan Sea during the last 85,000 years. Paleoceanography6, 499—518.
27.
Oba, T., Murayama, M., Matsumoto, E. and Nakamura, T.1995: AMS-14C ages of Japan Sea cores from the Oki Ridge . Daiyonki-Kenkyu (The Quaternary Research)34, 289—96 (in Japanese with English abstract).
28.
Oda, M. and Takemoto, A.1992: Planktonic foraminifera and paleoceanography in the domain of the Kuroshio Current around Japan during the last 20,000 years. Daiyonki-Kenkyu (The Quaternary Research) 31, 341—57 (in Japanese with English abstract).
29.
Oda, M. and Yamasaki, M.2005: Sediment trap results from the Japan Trench in the Kuroshio domain: seasonal variations in the planktic foraminiferal flux . Journal of Foraminiferal Research35, 315—26.
30.
Ortiz, J.D., Mix, A.C. and Collier, R.W.1995: Environmental control of living symbiotic and asymbiotic foraminifera of the California Current. Paleoceanography10, 987—1009.
31.
Ortiz, J.D., Mix, A.C., Rugh, W., Watkins, J.M. and Collier, R.W.1996: Deep-dwelling planktonic foraminifera of the northeastern Pacific Ocean reveal environmental control of oxygen and carbon isotopic desequilibria . Geochimica et Cosmochimica Acta60, 4509—23.
32.
Reynolds, L.A. and Thunell, R.C.1986: Seasonal production and morphologic variation of Neogloboquadrina pachyderma (Ehrenberg) in the northeast Pacific. Micropaleontlogy32, 1—18.
33.
Saito, Y.1998: Sea levels of the last glacial in the East China Sea continental shelf. Daiyonki-Kenkyu (The Quaternary Research ) 37, 235—42 (in Japanese with English abstract).
34.
Sawara, T. and Hanzawa, Y.1979: Distribution of water type in the East China Sea . Umi to Sora54, 135—48 (in Japanese with English abstract).
35.
Schiebel, R., Waniek, J., Bork, M. and Hemleben, C.2001: Planktic foraminiferal production stimulated by chlorophyll redistribution and entrainment of nutrients. Deep-Sea Research Part I48, 721—40.
36.
Stuiver, M. and Reimer, P.J.1993: Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon35, 215—30.
37.
Tada, R., Irino, T. and Koizumi, I.1999: Land—ocean linkages over orbital and millennial timescales recorded in late Quaternary sediments of the Japan Sea. Paleoceanography14, 236—47.
38.
Takei, T., Minoura, K., Tsukawaki, S. and Nakamura, T.2002: Intrusion of a branch of the Oyashio Current into the Japan Sea during the Holocene. Paleoceanography17, doi: 10.1029/ 2001PA000666.
39.
Tsukawaki, S., Ozawa, H., Domitsu, H., Kamiya, T., Kato, M. and Oda, M.2000: Preliminary results from the R.V. Tansei-maru Cruise KT98-17 in the southwestern marginal part of the Japan Sea — sediments, benthic and planktonic foraminifers, and ostracodes. Bulletin of the Japan Sea Research Institute Kanazawa University31, 89—119.
40.
Uda, M.1934: The results of simultaneous oceanographical investigations in the Japan Sea and its adjacent waters in May and June, 1932. Journal of the Imperial Fisheries Experimental Station5, 57—190 (in Japanese with English abstract).
