Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan
Fuente:
PANGAEA
Gespeichert in:
| Hauptverfasser: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
2019
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867171861724397568 |
|---|---|
| author | Lo, Li Lai, Yung-Hsiang Wei, Kuo-Yen Lin, Yu-Shih Mii, Horng-Sheng Shen, Chuan-Chou |
| author_facet | Lo, Li Lai, Yung-Hsiang Wei, Kuo-Yen Lin, Yu-Shih Mii, Horng-Sheng Shen, Chuan-Chou |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | To understand Holocene climate evolutions in low-latitude region of the western Pacific, paired δ18O and Mg/Ca records of planktonic foraminifer Globigerinoides ruber (250-300 μm, sensu stricto, s.s.) from a marine core ORI715-21 (121.5°E, 22.7°N, water depth 760 m) underneath the Kuroshio Current (KC) off eastern Taiwan were analyzed. Over the past 7500 years, the geochemical proxy-inferred sea surface temperature (SST) hovered around 27-28 °C and seawater δ18O (δ18OW) slowly decreased 0.2-0.4‰ for two KC sites at 22.7° and 25.3°N. Comparison with a published high-SST and high-salinity equatorial tropical Pacific record, MD98-2181 located at the Mindanao Current (MC) at 6.3°N, reveals an anomalous time interval at 3.5-1.5 kyr ago (before 1950 AD). SST gradient between the MC site and two KC site decrease from 1.5-2.0 °C to only 0-1 °C, and δ18OW from 0.1-0.3‰ to 0‰ for this 2-kyr time window. The high SST and low gradient could result from a northward shift of the North Equatorial Current, which implies a weakened KC. The long-term descending δ18OW and increasing precipitation in the entire low-latitude western Pacific and the gradually decreasing East Asian summer monsoonal rainfall during middle-to-late Holocene is likely caused by different land and ocean responses to solar insolation and/or enhanced moisture transportation from the Atlantic to Pacific associated with the southward movement of ITCZ. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_899214 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan Lo, Li Lai, Yung-Hsiang Wei, Kuo-Yen Lin, Yu-Shih Mii, Horng-Sheng Shen, Chuan-Chou AGE; Core; CORE; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; ORI715-21; Sea surface salinity; Sea surface temperature; Seawater δ18O; δ18O, seawater, reconstructed To understand Holocene climate evolutions in low-latitude region of the western Pacific, paired δ18O and Mg/Ca records of planktonic foraminifer Globigerinoides ruber (250-300 μm, sensu stricto, s.s.) from a marine core ORI715-21 (121.5°E, 22.7°N, water depth 760 m) underneath the Kuroshio Current (KC) off eastern Taiwan were analyzed. Over the past 7500 years, the geochemical proxy-inferred sea surface temperature (SST) hovered around 27-28 °C and seawater δ18O (δ18OW) slowly decreased 0.2-0.4‰ for two KC sites at 22.7° and 25.3°N. Comparison with a published high-SST and high-salinity equatorial tropical Pacific record, MD98-2181 located at the Mindanao Current (MC) at 6.3°N, reveals an anomalous time interval at 3.5-1.5 kyr ago (before 1950 AD). SST gradient between the MC site and two KC site decrease from 1.5-2.0 °C to only 0-1 °C, and δ18OW from 0.1-0.3‰ to 0‰ for this 2-kyr time window. The high SST and low gradient could result from a northward shift of the North Equatorial Current, which implies a weakened KC. The long-term descending δ18OW and increasing precipitation in the entire low-latitude western Pacific and the gradually decreasing East Asian summer monsoonal rainfall during middle-to-late Holocene is likely caused by different land and ocean responses to solar insolation and/or enhanced moisture transportation from the Atlantic to Pacific associated with the southward movement of ITCZ. |
| title | Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan |
| topic | AGE; Core; CORE; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; ORI715-21; Sea surface salinity; Sea surface temperature; Seawater δ18O; δ18O, seawater, reconstructed |
| url | https://doi.org/10.1594/PANGAEA.899214 |