# Northern Okinawa Trough Geochemical, Sedimentary and Oxygen Isotope Data during the last 24.3 ka #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: http://www.ncdc.noaa.gov/paleo/study/18755 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/chang2015/chang2015-c-n.txt # # Archive: Paleoceanography # # Parameter_Keywords: geochemistry, physical properties, oxygen isotopes, carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2015-06-03 #--------------------------------------- # Title # Study_Name: Northern Okinawa Trough Geochemical, Sedimentary and Oxygen Isotope Data during the last 24.3 ka #--------------------------------------- # Investigators # Investigators: Chang, Fengming; Li, Tiegang; Xiong, Zhifang; Xu, Zhaokai #--------------------------------------- # Description and Notes # Description: Detailed records of multiple proxies constraining terrigenous discharge to the northern Okinawa Trough during the last 24.3 ka # Provided Keywords: terrigenous input; sea-level change; East China Sea #--------------------------------------- # Publication # Authors: Fengming Chang, Tiegang Li, Zhifang Xiong and Zhaokai Xu # Published_Date_or_Year: 2015 # Published_Title: Evidence for sea-level and monsoonally-driven variations in terrigenous input to the northern East China Sea during the last 24.3 ka # Journal_Name: Paleoceanography # Volume: 30 # Issue: # Pages: # DOI: 10.1002/2014PA002733 # Abstract: Geochemical and sedimentological analyses of core PC-1 recovered from the northern East China Sea (ECS) provide insights into variations in terrigenous input associated with sea-level and climate changes over the past 24.3 ka. Based on high-resolution multiproxy records, our results suggest that the competing processes of sea-level and monsoonally-driven precipitation determined terrigenous input to the northern ECS. Dominance of terrigenous material, along with relatively light G. ruber d18O, indicate that the Last Glacial Maximum (LGM) lowstand of sea-level have occurred during the period 21.5-19.6 ka, not suggesting an early slow rise but supporting the conventional LGM age of 21 ka. This LGM lowstand was terminated by the rapid sea-level rise of 19-ka MWP, which is well expressed by the nearly synchronous decreases in both terrigenous detritus and mean grain size from 19.6 to 18.9 ka. MWP-1A is clearly marked in our records by a sharp reduction in terrigenous input and pronounced maxima of G. ruber d18O at 15.3-14.8 ka, given the considerable age uncertainties of deglacial marine radiocarbon samples. A slightly increasing input of terrigenous matter is noted after 13.4 ka, potentially pointing to a sea-level fall following the Inter-Allerød Cooling Period (IACP), which was seldom reported previously. Although MWP-1B did not leave robust signatures in terrigenous input, it is explicitly captured by the heavy d18O of G. ruber and decline in mean grain size at 11.5-10.9 ka. MWP-1c probably occurred in a broad millennial interval with multiple peaks, which are robustly marked by the abrupt variations in terrigenous input and marine organic matter at 9.7-9.3 and 9.1 ka, respectively. During the late Holocene, the effect of continuously weakening monsoon precipitation overwhelmed that of stable sea-level resulting in a uniform increase in the proportion of marine-derived organic matter after 5.5 ka. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site Information # Site_Name: PC-1 # Location: Western Pacific Ocean # Country: # Northernmost_Latitude: 31.458333 # Southernmost_Latitude: 31.458333 # Easternmost_Longitude: 128.413333 # Westernmost_Longitude: 128.413333 # Elevation: -590 #--------------------------------------- # Data_Collection # Collection_Name: PC-1 C and N Chang15 # First_Year: 24300 # Last_Year: 78 # Time_Unit: cal yr BP # Core_Length: 812 m # Notes: #--------------------------------------- # Chronology_Information # Chronology: # Accession Number depth_top depth_bottom AMS 14C Age ± Error (a BP) Calendar Age (a BP) 2 s range of calendar Age (a BP) Materials /Species Remarks # OS-59020 8 12 1290±30 781 702-880 N. dutertrei Accepted # OS-59102 64 68 3880±30 3780 3680-3879 N. dutertrei Accepted # OS-74457 128 130 6890±50 7358 7255-7446 Mixed shells Accepted # OS-57323 148 152 7000±50 7458 7365-7556 N. dutertrei Rejectd # Beta-370655 182 184 8770±30 9404 9303-9468 Mixed shells Accepted # OS-59100 220 224 9160±40 9846 9675-10043 N. dutertrei Accepted # Beta-370656 324 326 11460±40 12863 12719-13000 Mixed shells Accepted # OS-57395 350 352 12150±70 13550 13378-13739 N. dutertrei Accepted # Beta-370657 380 382 12960±50 14751 14338-15072 Mixed shells Accepted # OS-59186 404 406 9360±50 10153 9990-10240 N. dutertrei Rejectd # Beta-370658 412 414 11640±40 13076 12919-13207 Mixed shells Rejectd # OS-74458 420 422 12150±45 13540 13406-13698 Mixed shells Rejectd # Beta-370659 446 452 13550±60 15709 15417-15954 Mixed shells Accepted # OS-57328 498 502 13850±50 16120 15919-16291 N. dutertrei Accepted # Beta-370660 526 532 15210±60 17954 17754-18142 Mixed shells Accepted # OS-59017 596 600 17000±60 19964 19728-20164 Mollusc Accepted # OS-59018 706 710 18100±60 21342 21063-21588 Mollusc Accepted # OS-57336 750 754 19200±95 22604 22403-22873 N. dutertrei Accepted # OS-59011 808 810 13650±80 15857 15581-16121 N. dutertrei Rejectd #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth_cm Depth,,,cm ,,,,,N ## age_calkaBP age, , , calendar kiloyears before 1950AD, , , , ,N ## toc% total organic carbon percent,,,percent,,paleoceanography,,used Finnigan Delta Plus XP online with Costech EA 1108 Element Analyzer,N ## tn% total nitrogen percent,,,percent,,paleoceanography,,used Finnigan Delta Plus XP online with Costech EA 1108 Element Analyzer,N ## d13Corg delta 13C,organic carbon,, per mil PDB,,paleoceanography,,used Finnigan Delta Plus XP online with Costech EA 1108 Element Analyzer,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN Depth_cm age_calkaBP toc% tn% d13Corg 1 0.0781 3.505512861 0.449773877 -20.6294275 3 0.2343 3.732281021 0.471654781 -20.1015904 5 0.3905 3.581457172 0.452488893 -20.301652 7 0.5467 3.778429006 0.483480567 -20.313366 9 0.7029 3.523968569 0.447705225 -20.1224919 11 0.834553571 3.930664145 0.527396711 -20.67373936 13 0.941660714 3.48194574 0.493552883 -20.4499145 15 1.048767857 3.62544 0.48692 -20.2364764 17 1.155875 3.785581242 0.522362647 -20.57204 19 1.262982142 3.649245638 0.464408054 -20.2308192 21 1.370089285 3.232979284 0.415238711 -20.41384336 23 1.477196428 3.191502028 0.398391481 -20.2586664 25 1.584303571 3.322528017 0.433960546 -20.2775048 26.5 1.664633928 3.71919775 0.479487 -20.49855892 27.65 1.726220535 3.504695645 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