http://scholars.ntou.edu.tw/handle/123456789/20641
Title: | New Insights Into Kuroshio Current Evolution Since the Last Deglaciation Based on Paired Organic Paleothermometers From the Middle Okinawa Trough | Authors: | Li, Qian Li, Guangxue Chen, Min-Te Xu, Jishang Liu, Shidong Chen, Mengna |
Keywords: | EAST CHINA SEA;NORTH EQUATORIAL CURRENT;EL-NINO/SOUTHERN-OSCILLATION;LONG-CHAIN ALKENONES;SURFACE TEMPERATURE;PALEOENVIRONMENTAL CHANGE;HIGH-RESOLUTION;ASIAN MONSOON;NORTHWESTERN PACIFIC;GEOCHEMICAL RECORDS | Issue Date: | Dec-2020 | Publisher: | AMER GEOPHYSICAL UNION | Journal Volume: | 35 | Journal Issue: | 12 | Source: | PALEOCEANOGR PALEOCL | Abstract: | As an important hydrological parameter in the upper ocean, the depth of the thermocline (DOT) in the Okinawa Trough (OT) is closely linked to air-sea interactions and Kuroshio Current (KC) intrusions. However, high-resolution DOT records in the OT since the last deglaciation have not been well reconstructed. In this study, we generated surface ((UK)-K-37') and shallow subsurface (TEX86H) temperature records from core M063-05, obtained from the middle OT, and reconstructed annual mean DOT variations since the last deglaciation based on vertical temperature gradients (Delta T (U37K'-TEX86H). The DOT variations in the OT are interpreted to be mainly driven by the KC, with a stronger KC resulting in a deeper DOT and a smaller Delta T (U37K'-TEX86H). In our reconstruction, the KC intensity increased gradually during the last deglaciation, with a reduction during the Younger Dryas, reached a maximum in the early Holocene, and then gradually declined during the middle to late Holocene. We also investigated the responses of the KC to high- and low-latitude climate systems. On orbital timescales, the evolution of the KC occurred in parallel to precession-induced El Nino-Southern Oscillation (ENSO) dynamics. On millennial timescales, fluctuations in the intensity of the KC during the last deglaciation suggest a dynamic link to the North Atlantic climate via the East Asian Monsoon. We propose that the Delta T between (UK)-K-37'- and TEX86H-based temperatures is a reliable indicator for high-resolution studies on the hydrographic structure of the OT and paleoceanographic evolution in the East China Sea. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/20641 | ISSN: | 2572-4517 | DOI: | 10.1029/2020PA004140 |
Appears in Collections: | 地球科學研究所 13 CLIMATE ACTION |
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