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Lo, Li; Lai, Yung-Hsiang; Wei, Kuo-Yen; Lin, Yu-Shih; Mii, Horng-Sheng; Shen, Chuan-Chou (2019): Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan. PANGAEA, https://doi.org/10.1594/PANGAEA.899214, Supplement to: Lo, L et al. (2013): Persistent sea surface temperature and declined sea surface salinity in the northwestern tropical Pacific over the past 7500years. Journal of Asian Earth Sciences, 66, 234-239, https://doi.org/10.1016/j.jseaes.2013.01.014

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Abstract:
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.
Keyword(s):
Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; Sea surface temperature; Seawater δ18O
Coverage:
Latitude: 22.700000 * Longitude: 121.500000
Minimum Elevation: -760.0 m * Maximum Elevation: -760.0 m
Event(s):
ORI715-21 * Latitude: 22.700000 * Longitude: 121.500000 * Elevation: -760.0 m * Location: Kuroshio Current * Method/Device: Core (CORE)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1AGEAgeka BPLo, LiGeocode
2Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molLo, Li
3Sea surface temperatureSST°CLo, Li
4Globigerinoides ruber, δ18OG. ruber δ18O‰ PDBLo, Lid18Oc, VPDB
5δ18O, seawater, reconstructedδ18Osw‰ SMOWLo, Lid18Ow, VSMOW
6Sea surface salinitySSSLo, Li
Size:
455 data points

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