Advertisement

Chinese Science Bulletin

, 54:3739 | Cite as

Palaeoenvironmental changes from pollen record in deep sea core PC-1 from northern Okinawa Trough, East China Sea during the past 24 ka

  • HongYan Xu
  • FengMing Chang
  • YunLi LuoEmail author
  • XiangJun Sun
Articles / Geology

Abstract

A pollen record of core PC-1 from the northern Okinawa Trough, East China Sea (ECS), provides information on vegetation and climate changes since 24 cal. kaBP. A total of 103 samples were palynologically analyzed at 8 cm intervals with a time resolution of 230 a. Four pollen zones are recognized: zone I (812–715 cm, 24.2–21.1 cal. kaBP), zone II (715–451 cm, 21.1–15.2 cal. kaBP), zone III (451–251 cm, 15.2–10.8 cal. kaBP), zone IV (251–0 cm, 10.8–0.3 cal. kaBP), corresponding to Late MIS 3, Last Glacial Maximum (LGM), deglaciation and Holocene, respectively. The LGM is characterized by the dominance of herbs, mainly Artemisia, and high pollen influx, implying an open vegetation on the exposed continental shelf and a cool and dry climate. The deglaciation is a climate warming stage with Pinus percentage increased and Artemisia percentage decreased and a rapid sea-level rise. The Holocene is characterized by predominance of tree pollen with rapid increase in Castanea-Castanopsis indicating the development of mixed evergreen and deciduous broad-leaved forest and a warm, humid climate. Low pollen influx during the Holocene probably implies submergence of the continental shelf and retreat of the pollen source area. The vegetation indicated by pollen assemblage found in this upper zone is consistent with the present vegetation found in Kyushu, Japan. Originating from the humid mountain area of North Luzon of the Philippines, Tasmania and New Zealand, Phyllocladus with sporadic occurrence throughout PC-1 core probably suggests the influence of Palaeo-Kuroshio Current or intense summer monsoon. The observed changes in Pinus and Herbs percentage indicate fluctuations of the sea level, and high Pinus percentage corresponds to high sea level. Spectrum analysis of the pollen percentage record reveals many millennial-scale periodicities, such as periodicities of 6.8, 3.8, 2.2, 1.6 ka.

Keywords

East China Sea Okinawa Trough palynology Kuroshio palaeoenvironment MIS 

References

  1. 1.
    Qin Y S, Zhao Y Y, Chen L R, et al. Geology of the East China Sea (in Chinese). Beijing: Science Press, 1987. 1–200Google Scholar
  2. 2.
    Saito Y, Katayama H, Ikehara K, et al. Transgressive and highstand systems tracts and post-glacial transgression, the East China Sea. Sediment Geol, 1998, 122: 217–232CrossRefGoogle Scholar
  3. 3.
    Ujiie H, Ujiie Y. Late Quaternary course changes of the Kuroshio Current in the Ryukyu arc region, northwestern Pacific Ocean. Mar Micropaleontol, 1999, 37: 23–40CrossRefGoogle Scholar
  4. 4.
    Jian Z M, Saito Y, Wang P X, et al. Shifts of the Kuroshio axis over the last 20 000 years. Chin Sci Bull, 1998, 43: 1053–1056CrossRefGoogle Scholar
  5. 5.
    Jian Z M, Wang P X, Saito Y, et al. Holocene variability of the Kuroshio Current in the Okinawa Trough, northwestern Pacific Ocean. Earth Planet Sci Lett, 2000, 184: 305–319CrossRefGoogle Scholar
  6. 6.
    Kawahata H, Ohshima H. Vegetation and environmental record in the northern East China Sea during the late Pleistocene. Glob Planet Change, 2004, 41: 251–273CrossRefGoogle Scholar
  7. 7.
    Li T G, Sun R T, Zhang D Y, et al. Evolution and variation of the Tsushima warm current during the late Quaternary: Evidence from planktonic foraminifera, oxygen and carbon isotopes. Sci China Ser D-Earth Sci, 2007, 50: 725–735CrossRefGoogle Scholar
  8. 8.
    Deng Y, Zheng Z, Suc J P, et al. Pollen assemblages of the Last Glacial Maximum in Okinawa Trough and their implication on paleoenvironment (in Chinese). Earth Sci-J Chin Univ Geosci, 2005, 30: 597–603Google Scholar
  9. 9.
    Lü H Y, Liu Z X, Liu B Z, et al. Asynchrony of the marine and epicontinental climate records in the east Asia during the last 20 ka (in Chinese). Mar Geol Quat Geol, 2002, 22: 17–23Google Scholar
  10. 10.
    Song C Q, Sun X J, Saito Y. Paleoenvironmental information recorded by pollen in B-3GC gravity core in Okinawa Trough. Chin Sci Bull, 2001, 46: 938–942CrossRefGoogle Scholar
  11. 11.
    He F. Forest Vegetations in Japan (in Chinese). J Sichuan For Sci Technol, 2006, 27: 38–41Google Scholar
  12. 12.
    Ijiri A, Wang L J, Oba T, et al. Paleoenvironmental changes in the northern area of the East China Sea during the past 42000 years. Palaeogeogr Palaeoclimatol Palaeoecol, 2005, 219: 239–261CrossRefGoogle Scholar
  13. 13.
    Hughen K A, Baillie M G L, Bard E, et al. MARINE04 marine radiocarbon age calibration, 0–26 cal kyr BP. Radiocarbon, 2004, 46: 1059–1086Google Scholar
  14. 14.
    Reimer P J, Baillie M G L, Bard E, et al. INTCAL04 Terrestrial Radiocarbon age calibration, 0–26 cal kyr BP. Radiocarbon, 2004, 46: 1029–1058Google Scholar
  15. 15.
    Machida H, Arai F. Extensive ash falls in and around the Sea of Japan from large late quaternary eruptions. J Volcanol Geotherm Res, 1983, 18: 151–164CrossRefGoogle Scholar
  16. 16.
    Wang K F, Sun Y H, Zhang Y L, et al. The Spore-Pollen and Algal Assemblage in the East China Sea Sediments (in Chinese). Beijing: Ocean Press, 1987. 1–139Google Scholar
  17. 17.
    Sun X J, Song C Q, Chen X D. “China Quaternary Pollen Database” (CPD) and “Biome 6000” Project (in Chinese). Adv Earth Sci, 1999, 14: 407–411Google Scholar
  18. 18.
    Members of China Quaternary Pollen Data Base. Pollen-based biome reconstruction at Middle Holocene (6 kaBP) and Last Glacial Maximum (18 kaBP) in China (in Chinese). Acta Bot Sin, 2000, 42: 1201–1209Google Scholar
  19. 19.
    Tsukada M. Vegetation and climate during the Last Glacial Maximum in Japan. Quat Res, 1983, 19: 212–235CrossRefGoogle Scholar
  20. 20.
    Xu X D, Oda M. Surface-water evolution of the eastern East China Sea during the last 36,000 years. Mar Geol, 1999, 156: 285–304CrossRefGoogle Scholar
  21. 21.
    Sun X J, Luo Y L, Huang F, et al. Deep-sea pollen from the South China Sea: Pleistocene indicators of East Asian monsoon. Mar Geol, 2003, 201: 97–118CrossRefGoogle Scholar
  22. 22.
    Luo Y L, Sun X J. Vegetation evolution and millennial-scale climatic fluctuations since Last Glacial Maximum in pollen record from northern South China Sea. Chin Sci Bull, 2005, 50: 793–799CrossRefGoogle Scholar
  23. 23.
    Sun X J, Luo Y L. Pollen record of the last 280 ka from deep sea sediments of the northern South China Sea. Sci China Ser D-Earth Sci, 2001, 44: 879–888CrossRefGoogle Scholar
  24. 24.
    Delectis Florae Reipublicae Popularis Sinicae Agendae Academiae Sinicae Edita. Flora Reipublicae Popularis Sinicae (Tomus 1) (in Chinese). Beijing: Science Press, 2004. 112Google Scholar
  25. 25.
    Schulz M, Stattegger K. Spectrum analysis of unevenly spaced paleoclimatic time series. Comput Geosci, 1997, 23: 929–945CrossRefGoogle Scholar
  26. 26.
    Heinrich H. Origin and consequence of the cyclic ice rafting in the Northeast Atlantic Ocean during the past 130000 years. Quat Res, 1988, 29:142–152CrossRefGoogle Scholar
  27. 27.
    Elliot M, Labeyrie L, Bond G, et al. Millennial-scale iceberg discharges in the Irminger Basin during the last glacial period: Relationship with the Heinrich events and environmental settings. Plaeoceanography, 1998, 13: 433–446CrossRefGoogle Scholar
  28. 28.
    Broecker W S. Massive iceberg discharge as triggers for global climate change. Nature, 1994, 372: 421–424CrossRefGoogle Scholar
  29. 29.
    Dansgarrd W, Johnsen S J, Clausen H B, et al. Evidence for general instability of past climate from a 250-kyr ice-core record. Nature, 1993, 364: 218–220CrossRefGoogle Scholar
  30. 30.
    Bond G, Broecker W S, Johnsen S, et al. Correlations between climate records from North Atlantic sediments and Greenland ice. Nature, 1993, 365: 143–147CrossRefGoogle Scholar
  31. 31.
    Pterson L C, Huang G H, Hughen K, et al. Rapid changes in the hydrologic cycle of the tropical Atlantic during the last glacial. Science, 2000, 290: 1947–1951CrossRefGoogle Scholar

Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • HongYan Xu
    • 1
    • 4
  • FengMing Chang
    • 2
  • YunLi Luo
    • 1
    Email author
  • XiangJun Sun
    • 1
    • 3
  1. 1.State Key Laboratory of Systematic and Evolutionary Botany, Institute of BotanyChinese Academy of SciencesBeijingChina
  2. 2.Key Laboratory of Marine Geology and Environment, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  3. 3.State Key Laboratory of Marine GeologyTongji UniversityShanghaiChina
  4. 4.Graduate University of Chinese Academy of SciencesBeijingChina

Personalised recommendations