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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2025
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| Online Access: | https://doi.org/10.1594/PANGAEA.973858 |
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| _version_ | 1867169163585257472 |
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| author | Takata, Hiroyuki Chun, Jong-Hwa Cheong, Daekyo Khim, Boo-Keun |
| author_facet | Takata, Hiroyuki Chun, Jong-Hwa Cheong, Daekyo Khim, Boo-Keun |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We investigated fossil planktonic foraminifera from cores ND-02 (Nakdong River delta) and PC-11 (inner shelf off southeast Korea), to assess millennial-scale variations in the surface oceanography. The coiling ratio of Neogloboquadrina pachyderma shows five millennial-scale near-cyclic variations (~8.7-8.3, ~7.5-6.2, ~4.7, ~2.8 and ~0.5 ka) since ~9 ka. These variations are similar to warm-water diatom variations at the Oki Ridge where a cyclicity of ~1.6 kyr is present, possibly associated with a Bond event. By contrast, the near-cyclic variations in our planktonic foraminiferal record were not fully consistent with the reported intensity variations of the Tsushima Warm Current in the East Asian margin and the warm Kuroshio Current in the Northwest Pacific. Our records from southeast Korea seem to reflect the more regional oceanographic variations in the marginal seas of East Asia. We suggest that the coastal upwelling of the subsurface cold water along the southeast coast of Korea plays an important role in generating near-cyclic variations of warm-water biota. These variations may have a connection to the Bond event periodicity in the North Atlantic Ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_973858 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Occurrences of fossil planktonic foraminifera in cores PC-11 and ND-2 Takata, Hiroyuki Chun, Jong-Hwa Cheong, Daekyo Khim, Boo-Keun AGE; Counting >125 µm fraction; DEPTH, sediment/rock; East coast of Korea; Event label; Foraminifera, planktic; Foraminifera, planktic, total; Foraminifera, planktic indeterminata; Gallitellia vivans; Globigerina bulloides; Globigerina sp.; Globigerinita glutinata; Globigerinita uvula; Globigerinoides conglobatus; Globigerinoides ruber; Globoconella inflata; Globorotalia menardii; Globorotalia sp.; KIGAM2011-SG_PC-11; KNU_ND-02; Neogloboquadrina dutertrei; Neogloboquadrina incompta; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma dextral/sinistral, coiling ratio; Neogloboquadrina pachyderma sinistral; Orbulina universa; PC; Piston corer; Planktonic foraminifera; Pulleniatina obliquiloculata; Shallow-marine sediments; Split; Trilobatus sacculifer; Turborotalita quinqueloba; Upwelling We investigated fossil planktonic foraminifera from cores ND-02 (Nakdong River delta) and PC-11 (inner shelf off southeast Korea), to assess millennial-scale variations in the surface oceanography. The coiling ratio of Neogloboquadrina pachyderma shows five millennial-scale near-cyclic variations (~8.7-8.3, ~7.5-6.2, ~4.7, ~2.8 and ~0.5 ka) since ~9 ka. These variations are similar to warm-water diatom variations at the Oki Ridge where a cyclicity of ~1.6 kyr is present, possibly associated with a Bond event. By contrast, the near-cyclic variations in our planktonic foraminiferal record were not fully consistent with the reported intensity variations of the Tsushima Warm Current in the East Asian margin and the warm Kuroshio Current in the Northwest Pacific. Our records from southeast Korea seem to reflect the more regional oceanographic variations in the marginal seas of East Asia. We suggest that the coastal upwelling of the subsurface cold water along the southeast coast of Korea plays an important role in generating near-cyclic variations of warm-water biota. These variations may have a connection to the Bond event periodicity in the North Atlantic Ocean. |
| title | Occurrences of fossil planktonic foraminifera in cores PC-11 and ND-2 |
| topic | AGE; Counting >125 µm fraction; DEPTH, sediment/rock; East coast of Korea; Event label; Foraminifera, planktic; Foraminifera, planktic, total; Foraminifera, planktic indeterminata; Gallitellia vivans; Globigerina bulloides; Globigerina sp.; Globigerinita glutinata; Globigerinita uvula; Globigerinoides conglobatus; Globigerinoides ruber; Globoconella inflata; Globorotalia menardii; Globorotalia sp.; KIGAM2011-SG_PC-11; KNU_ND-02; Neogloboquadrina dutertrei; Neogloboquadrina incompta; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma dextral/sinistral, coiling ratio; Neogloboquadrina pachyderma sinistral; Orbulina universa; PC; Piston corer; Planktonic foraminifera; Pulleniatina obliquiloculata; Shallow-marine sediments; Split; Trilobatus sacculifer; Turborotalita quinqueloba; Upwelling |
| url | https://doi.org/10.1594/PANGAEA.973858 |