Abstract
Low sea surface salinity event in the East Sea during the LGM (last glacial maximum) has been critically and thoroughly reviewed based on previous studies, but freshwater source for this low paleosalinity still remains to a great extent questionable. This paper presents that the Korea Strait was partially open during the LGM, transporting the paleo-Water (0.5–2.1×1012 m3/yr) to the East Sea. The paleo-Water, presumably a mixture of high amount of freshwater and the paleo-Tsushima Current, might not be enough to explain the decrease of sea surface salinity (SSS) in the surface layer (79.75×1012 m3) of the LGM East Sea. Assuming that the paleo-Water is entire freshwater, it could only lower less than 1.1‰ of surface salinity. Moreover, differences in SSS (between 20‰ of the LGM and the present 34‰ in the East Sea) and planktonic foraminiferal σ18O (between the regional East Sea and the global Pacific Ocean during the LGM) are approximately 14‰ and 3.8–4.1‰, respectively. According to general trend that 1‰ salinity decrease correponds to about 0.5‰ lowering of σ18O (Broecker, 1989), 3.8–4.1‰ decrease in σ18O could lower 7.6–8.2‰ in salinity, resulting in 25.8–26.4‰ of the SSS in the LGM East Sea. This SSS (25.8–26.4‰) is still much saline than 20‰. Furthermore, about 5.8–6.4‰ of salinity difference needs to be explained, and further indicates freshwater dilution in the LGM East Sea. Therefore, these semi-quantitative calculations evidence additional freshwater supply to the East Sea, lowering sea surface salinity during the LGM. Potentially additional source for freshwater might have been the Amur River inflow into the East Sea.
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Bard, E., Arnold, M., Dupart, J. and Duplessy, J.C., 1987, Reconstruction of the last deglaciation: deconvolved records of σ18O profiles, micropaleontological variations and accelerator mass spectrometric14C dating. Climate Dynamics, 1, 101–112.
Bard, E., Hamelin, B. and Fairbanks, R.G., 1990, U/Th ages obtained by mass spectrometry in corals from Barbados: sea level during the past 130,000 years. Nature, 346, 456–458.
Berner, E.K. and Berner, R.A., 1987, The Global Water Cycle: Geochemistry and Environent. Prentice-Hall, New Jersey, 297 p.
Broecker, W.S., 1989, The salinity contrast between the Atlantic and Pacific Oceans during glacial time. Plaeoceanography, 4, 207–212.
Broecker, W.S., 2000, Abrupt climate change: causal conttraints provided by the paleoclimate record. Earth-Science Reviews, 51, 137–154.
Choi, B.H., 2001, Grided digital topography and bathymetry. In: Choi, B.H., Lie, H.J., Go, Y.B., Lee, J.H., Lee, J.C. and Noh, Y. (eds), Proceedings the 11th PAMS/JECSS Workshop extra CD-ROM, Cheju, April 11–13.
Crowley, T.J. and North, G.R., 1991, Paleoclimatology: Oxford University Press, New York, 339 p.
Dansgaard, W. and Tauber, H., 1969, Glacier Oxygen-18 content and Pleistocene ocean temperature. Science, 166, 499–502.
Duplessy, J.C., 1978, Isotope studies. In: Gribbin, J. (ed.), Climatic change. Cambridge University Press, New York, p. 46–67.
Duplessy, J.C., Labeyrie, L., Juillet-Leclerc, A., Maitre, F., Duprat, J. and Sarnthein, M., 1991, Surface salinity reconstruction of the North Atlantic Ocean during the last glacial maximum. Oceanologica Acta, 14, 311–324.
Emiliani, C., 1954, Depth habitat of some species of planktonic foraminifera as indicated by oxygen isotope ratios. American Journal of Sciences, 252, 149–158.
Emiliani, C., 1955, Pleistocene temperatures. Journal of Geology, 63, 538–578.
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. Nature, 342, 637–642.
Fleming, K., Johnston, P., Zwartz, D., Yokoyama, Y., Lambeck, K. and Chappell, J., 1998. Refining the eustatic sea-level curve since the last glacial maximum using far- and intermediate-field sites. Earth and Planetary Sciences Letters, 163, 327–342.
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. Paleogeography, Paleoclimatology, Paleoecology, 156, 177–193.
Haq, B.U. and Boersma, A., 1978, Introduction to marine micropaleontology, Elsevier, New York, 374 p.
Isobe, A., 1999, On the origin of the Tsushima Warm Current and its seasonality. Continental Shelf Research, 19, 117–133.
Isobe, A., Ando, M., Watanabe, T., Senjyu, T., Sugihara, S. and Manda, A., 2002, Freshwater and temperature transports through the Tsushima-Korea Straits. Journal of Geophysical Research, 107 (C7), 10.1029/2000JC000702.
Keigwin, L.D. and Gorbarenko, S.A., 1992, Sea level, surface salinity of Dryas event in the Northwestern Pacific ocean. Quaternary Research, 37, 346–360.
Kim, S.J., Flato, G. and Boer, G., 2003, A coupled climate model simulation of the Last Glacial Maximum, Part 2: approach to equilibrium. Climate Dynamics, 20, 635–661.
Labeyrie, L.D., Duplessy, J.C. and Blanc, P.L., 1987, Variations in mode of formation and temperature of oceanic deep waters over the past 125,000 years. Nature, 327, 477–482.
Lee, E. and Nam, S., 2003, Fresh-water supply by the Korean rivers to the East Sea during the last glacial maximum: a review and new evidences from the Korea Strait region. Geo-Marine Letters, 23, 1–6.
Lee, E., Nam, S. and Park, S.C., 2004, Paleo-Tsushima Water influx to the East Sea and its implications on low surface salinity during the last glacial maximum. Quaternary Science Reviews (under revision).
Lim, C.H. and An, H.S., 1985, The comparison of the volume transport in the Korea Strait and in the Middle of the East Sea (Japan Sea). Journal of the Korea Society of Oceanography, 29, 50–55.
Matsui, H., Tada, R. and Oba, T., 1998, Low-salinity isolation event of the Japan Sea in response to eustatic sea-level drop durting the LGM: Reconstruction based on salinity-balance model. The Quaternary Research, 37, 221–233.
McManus, J.F., Oppo, D.W. and Cullen, J.L., 1999, A 0.5-million-year record of millennial-scale climate variability in the North Atlantic. Science, 283, 971–975.
Mix, A.C., 1987, The oxygen-isotope record of glaciation. In: Ruddiman, W.F. and Wright, H. (eds.), The geology of North America. Geological Society of America, Boulder, p. 111–135.
Mix, A.C., Bard, E. and Schneider, R., 2001, Environmental processes of the ice age: land, oceans, glaciers (EPILOG). Quaternary Science Reviews, 20, 627–657.
Morley, J.J., Heuser, L.E. and Sarro, T., 1986, Latest Pleistocene and Holocene paleoenvironment of Japan and its marginal sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 53, 349–358.
Nijssen, B., O'Donnell, G.M., Hamlet, A.F. and Lettenmaier, D.P., (2001), Hydrologic sensitivity of global rivers to climate change. Climatic Change, 50, 143–175.
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. Paleoceanography, 6, 499–518.
Oba, T., Murayama, M., Matsumoto, E. and Nakamura, T., 1995, AMS14C ages of Japan Sea cores from the Oki Ridge. The Quaternary Research, 34, 289–296.
Ono, Y., 1984, Last glacial paleoclimate reconstructed from glacial and periglacial landforms in Japan. Geographical Review of Japan, 57B(1), 87–100.
Park, S.C., Yoo, D.G., Lee, C.W. and Lee, E.I., 2000, Last glacial sea-level changes and paleogeography of the Korea (Tsushima) Strait. Geo-Marine Letters, 20, 64–71.
Patience, A.J. and Kroon, D., 1991, Oxygen isotope chronostratigraphy. In: Smart, P.L. and Frances, P.D. (eds.), Quaternary dating methods—a users guide, Technical guide 4, Quaternary Research Association, Cambridge, p. 199–228.
Pickard, G.L. and Emery, W.J., 1988, Descriptive physical oceanography. Pergamon Press, New York, 249 p.
Pirazzoli, P.A., 1996, Sea-Level Changes: The Last 20,000 Years. John Wiley & Sons, New York, 211 p.
Rind, D. and Peteet, D., 1985, Terrestrial conditions at the Last Glacial Maximum and CLIMAP sea-surface temperature estimates: Are they consistent? Quaternary Research, 24, 1–22.
Ruddiman, W.F., 2001, Earths climate: past and future. W.H. Freeman and Company, New York, 465 p.
Schrag, D.P., Adkins, J.F., McIntyre, K., Alexander, J.L., Hodell, D.A., Charles, C.D. and McManus, J.F., 2002, The oxygen isotopic composition of seawater during the Last Glacial Maximum. Quaternary Science Review, 21, 331–342.
Shackleton, N.J., 1967, Oxygen isotope analyses and Pleistocene temperature re-assessed. Nature, 215, 15–17.
Stuiver, M., Reimer, P.J., Bard, E., Beck, J.W., Burr, G.S., Hughen, K.A., Kromer, B., McCormac, G., van der Plicht, J. and Spurk, M., 1998, INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon, 40, 1041–1083.
Tada, R., 1999, Late Quaternary Paleoceanography of the Japan Sea: An Update. The Quaternary Research, 38, 216–222.
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. Paleoceanography, 14, 236–247.
Toba, Y., Tomizawa, K., Kurasawa, Y. and Hanawa, K., 1982, Seasonal and year-to-year variability of the Tsushima-Tsugaru Warm Current system with its possible cause. La mer, 20, 41–51.
Wright, H.E., Kutzbatch, J.E., Webb III, T., Ruddiman, W.E.F., Street-Perrott, F.A. and Bartlein, P.J., 1993, Global Climates Since the Last Glacial Maximum. University of Minnesota Press, Minneapolis, 569 p.
Yakunin, L.P., 1975, On the reliable Amur river discharge through the new channel. Bulletin of Far Eastern Scientific Research, Hydrometeorological Institute, 55, 61–64.
Yokoyama, Y., Lambeck, K., Deckker, P., Johnston, P. and Fifield, L.K., 2000, Timing of the Last Glacial Maximum from observed sea-level minima. Nature, 406, 713–716.
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Lee, E., Nam, S. Low sea surface salinity in the East Sea during the last glacial maximum: review on freshwater supply. Geosci J 8, 43–49 (2004). https://doi.org/10.1007/BF02910277
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DOI: https://doi.org/10.1007/BF02910277