베링해 중부 대륙사면 지역의 지난 65,000년 동안 탄산염 함량 변화와 Dansgaard-Oeschger 사건들 = Variation of Calcium Carbonate Content and Dansgaard-Oeschger Events in the Continental Slope of the Central Bering Sea during the Last 65 Kyr

다국어 초록 (Multilingual Abstract)

A piston core (MR06-04 PC23A) collected from the northern continental slope in the central Bering Sea has recorded the high-resolution millennial-scale variation of calcium carbonate (CaCO3) content during the last 65 kyr. An estimation of the age of the core sediments was carried out by using the lithologic correlation of the deglacial laminated layers with a neighboring core (HLY02023JPC), complementing the last appearance datum of both Lychnocanoma nipponica sakaii (54 kyr) and Amphimelissa setosa (85 kyr). The probable age of core MR06-04 PC23A was approximately younger than 65 kyr. Two distinct events of a significant increase of CaCO3 in the deglacial laminated sediments clearly correspond to MWP1A and MWP1B in the Bering Sea (Gorbarenko et al. 2005) and to T1ANP and T1BNP in the North Pacific (Gorbarenko 1996). These pronounced peaks of CaCO3 contents result from the elevated carbonate production in the surface water and the subsequent weakened dilution due to terrestrial input, along with an enhanced oxygen minimum zone. The CaCO3 contents are low (~2%) during the last glacial period mainly because of a low carbonate production caused by an expanded sea-ice cover and an increased dilution by terrigenous particles due to their closer distance to the continent during the sea-level low stand. The occurrence of seven distinct CaCO3 peaks in core MR06-04 PC23A is remarkable during MIS 3 and MIS 4, and they most likely correlate to the short-term millennial Dansgaard-Oeschger events.

참고문헌 (Reference)

1 Sancetta, C., "Wisconsin-Holocene paleoenvironment of the Bering Sea: Evidence from diatoms, pollen, oxygen isotopes and clay minerals" 62 : 55-68, 1985

2 Barnola, J.M., "Vostok ice core provides 160,000-year record of atmospheric CO2" 329 : 408-414, 1987

3 Niebauer, H.J., "Variability in Bering Sea ice cover as affected by a regime shift in the North Pacific in the period 1947-1996" 103 : 1998

4 Taylor, K.C., "The ‘flickering switch’ of late Pleistocene climate change" 361 : 432-436, 1993

5 Stabeno, P.J., "The physical oceanography of the Bering Sea, In: Dynamics of the Bering Sea" Univ. Alaska Sea Grant, Fairbanks 1-28, 1999

6 Johnsen, S.J., "The eem stable isotope record along the GRIP ice core and its interpretation" 43 : 117-124, 1995

7 Cook, M.S., "The deglacial history of surface and intermediate water of the Bering Sea" 52 : 2163-2173, 2005

8 Takahashi, K., "The Bering and Okhotsk Seas: Modern and paleoceanographic changes and gateway" 16 : 49-58, 1998

9 Hood,D.W, "The Bering Sea, In: Estuaries and enclosed Seas" Elsevier Scientific 337-373, 1983

10 Takahashi, K., "The Bering Sea and paleoceanography" 52 : 2080-2091, 2005

11 Gorbarenko, S.A., "Stable isotope and lithologic evidence of Late-Glacial and Holocene Oceanography of the northwestern Pacific and its marginal seas" 46 : 230-250, 1996

12 Okazaki, Y., "Productivity changes in the Bering Sea during the late Quaternary" 52 : 2150-2162, 2005

13 Honjo, S., "Particle fluxes and modern sedimentation in the polar oceans. p. 687-739. In: Polar oceanography" Academic Press 1990

14 Itaki, T., "Orbital- and millennial-scale changes of radiolarian assemblages during the last 220 kyrs in the Japan Sea" 247 : 115-130, 2007

15 Gorbarenko, S.A., "Orbital and millennium scale environmental changes in the southern Bering Sea during the last glacial-Holocene: Geochemical and paleontological evidence" 52 : 2174-2185, 2005

16 Favorite, F., "Oceanography of the subarctic Pacific region, 1960-71" 33 : 1-187, 1976

17 Kiefer, T., "North Pacific response to millennialscale changes in ocean circulation over the last 60 kyr" 16 : 179-189, 2001

18 Scipps Institution of Oceanography, "Initial reports of the deep sea drilling project, Vol. 19" National Science Foundation 913-, 1973

19 Feely, R.A., "In situ calcium carbonate dissolution in the Pacific Ocean" 16 (16): 1144

20 Morley, J.J., "Improved method for correlating late Pleistocene/Holocence records from the Bering Sea: Application of a biosiliceous/geochemical stratigraphy" 33 : 1203-1211, 1986

21 Bond, G.C., "Iceberg discharges into the North Atlantic on millennial time scales during the last glaciation" 267 : 1005-1010, 1995

22 Khen, G.V., "Hydrography of western Bering Sea shelf water, In: Dynamics of the Bering Sea" Univ. Alaska Sea Grant, Fairbanks. 161-176, 1999

23 Griffin,J.M, "Global Climate Change: The science, economics and politics" Edward Elgar 280-, 2003

24 Brunelle, B.G., "Evidence from diatom-bound nitrogen isotopes for subarctic Pacific stratification during the last ice age and a link to North Pacific denitrification changes" 22 : 2007

25 Dansgaard, W., "Evidence for general instability of past climate from a 250-kyr ice-core record" 364 : 218-220, 1993

26 Maykut, G.A., "Energy exchange over young sea ice in the central Arictic" 83 : 3646-3658, 1978

27 Sancetta, C., "Effect of Pleistocene glaciation upon oceanographic characteristics of the North Pacific Ocean and Bering Sea" 30 : 851-869, 1983

28 Katsuki, K., "Diatoms as paleoenvironmental proxies for seasonal productivity, sea-ice and surface circulation in the Bering Sea during the late Quaternary" 52 : 2110-2130, 2005

29 Hendy, I.L., "Dansgaard-Oeschger cycles and the California Current system: Planktonic foraminiferal response to rapid climate change in Santa Barbara Basin" 15 : 30-42, 2000

30 Bond, G., "Correlations between climate records from North Atlantic sediments and Greenland ice" 365 : 143-147, 1993

31 Petit, J.R., "Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica" 399 : 429-436, 1999

32 Behl, R.J., "Brief interstadial events in the Santa Barbara Basin, NE Pacific, during the past 60 kyr" 379 : 243-246, 1996

33 Penrose, N., "Biogenic sediments, In: Marine Geology" Prentice-Hall 1982

34 Niebauer, H.J., "An update on the climatology and sea ice of the Bering Sea, In: Dynamics of the Bering Sea" Alaska SeaGrant, Fairbanks 1999

35 Martinson, D.G., "Age dating and the orbital theory of ice ages: Development of a highresolution 0 to 300,000-year chronostratigraphy" 27 : 1-29, 1987

36 Fairbanks, R.G., "A 17000-year glacio-eustatic sea-level record: Influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation" 342 : 637-642, 1989