Millennial-scale planktic foraminifer faunal variability in the East China Sea during the past 40000 years (IMAGES MD012404 from the Okinawa Trough)

Yuan Pin Chang, Wei Lung Wang, Yusuke Yokoyama, Hiroyuki Matsuzaki, Hodaka Kawahata, Min Te Chen

Research output: Contribution to journalArticle

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Abstract

High resolution planktic foraminifer fauna assemblage data are used to reconstruct the millennial-scale sea surface temperature (SST) variability of the past 40000 years at an IMAGES core site (MD012404) in the Okinawa Trough in the East China Sea (ECS). The fauna assemblages in core MD012404 are dominated by five species - Globigerinoides ruber, Globigerina bulloides, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, and Globigerinita glutinata, which account for > 70% in relative abundance. Our Q-mode factor analysis decomposed the fauna abundance data into three factors, which indicate cold water mass, warm water mass, and possibly coastal water flow with low salinity in the ECS. The MD012404 fauna data show abrupt changes at ∼16 kya, suggesting a return to a warmer climate or warm water intrusion of the Kuroshio into the Okinawa Trough since the Last Glacial Maximum (LGM). SST estimates based on the fauna assemblages of planktic foraminifers indicate a LGM cooling of 1-2°C. A maximum cooling by 3-4°C is observed in episodic, millennial-scale events in the glacial stages of the record. The SST record displays variability that closely tracks the structure of oxygen isotopes of stalagmites from Hulu Cave and ice cores from GISP 2 Dansgaard/Oeschger cycles and Heinrich events. Low salinity in the ECS is inferred based on MD012404 fauna SST and planktic foraminifer oxygen isotope records for the cold millennial-scale intervals, pointing to the Intertropical Convergence Zone (ITCZ) and/or East Asian monsoon as important factors driving SST and salinity in the subtropical western Pacific, both on orbital and suborbital time scales.

Original languageEnglish
Pages (from-to)389-401
Number of pages13
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume19
Issue number4
DOIs
Publication statusPublished - 2008 Aug 1

Fingerprint

foraminifera
trough
fauna
sea surface temperature
Last Glacial Maximum
warm water
water mass
oxygen isotope
Dansgaard-Oeschger cycle
cooling
salinity
stalagmite
Heinrich event
sea surface salinity
intertropical convergence zone
ice core
cold water
factor analysis
cave
sea

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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title = "Millennial-scale planktic foraminifer faunal variability in the East China Sea during the past 40000 years (IMAGES MD012404 from the Okinawa Trough)",
abstract = "High resolution planktic foraminifer fauna assemblage data are used to reconstruct the millennial-scale sea surface temperature (SST) variability of the past 40000 years at an IMAGES core site (MD012404) in the Okinawa Trough in the East China Sea (ECS). The fauna assemblages in core MD012404 are dominated by five species - Globigerinoides ruber, Globigerina bulloides, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, and Globigerinita glutinata, which account for > 70{\%} in relative abundance. Our Q-mode factor analysis decomposed the fauna abundance data into three factors, which indicate cold water mass, warm water mass, and possibly coastal water flow with low salinity in the ECS. The MD012404 fauna data show abrupt changes at ∼16 kya, suggesting a return to a warmer climate or warm water intrusion of the Kuroshio into the Okinawa Trough since the Last Glacial Maximum (LGM). SST estimates based on the fauna assemblages of planktic foraminifers indicate a LGM cooling of 1-2°C. A maximum cooling by 3-4°C is observed in episodic, millennial-scale events in the glacial stages of the record. The SST record displays variability that closely tracks the structure of oxygen isotopes of stalagmites from Hulu Cave and ice cores from GISP 2 Dansgaard/Oeschger cycles and Heinrich events. Low salinity in the ECS is inferred based on MD012404 fauna SST and planktic foraminifer oxygen isotope records for the cold millennial-scale intervals, pointing to the Intertropical Convergence Zone (ITCZ) and/or East Asian monsoon as important factors driving SST and salinity in the subtropical western Pacific, both on orbital and suborbital time scales.",
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Millennial-scale planktic foraminifer faunal variability in the East China Sea during the past 40000 years (IMAGES MD012404 from the Okinawa Trough). / Chang, Yuan Pin; Wang, Wei Lung; Yokoyama, Yusuke; Matsuzaki, Hiroyuki; Kawahata, Hodaka; Chen, Min Te.

In: Terrestrial, Atmospheric and Oceanic Sciences, Vol. 19, No. 4, 01.08.2008, p. 389-401.

Research output: Contribution to journalArticle

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