DOI: 10.1016/j.palaeo.2017.07.008
论文题名: Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea
作者: Sun H. ; Li T. ; Liu C. ; Chang F. ; Sun R. ; Xiong Z. ; An B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 483 起始页码: 157
结束页码: 171
语种: 英语
英文关键词: Florisphaera profunda
; Planktonic foraminiferal oxygen isotope
; Upper water structure
; West Philippine Sea
; WPWP
英文摘要: We present planktonic foraminifera oxygen isotope and Florisphaera profunda abundance data from the International Marine Global Change Study Program (IMAGES) Core MD06-3050, which was collected in the West Philippine Sea on the margin of the Western Pacific Warm Pool (WPWP). Our records reveal marked changes in the upper water structure in the Kuroshio source region as early as 1.5 Ma, continuing through the mid-Pleistocene climate transition (MPT). These changes are evidenced by reconstructions of the thermocline (based on planktonic foraminiferal oxygen isotope differences) and the nutricline (based on the relative abundance of the coccolithophore species Florisphaera profunda) in the Kuroshio source region. The evolution of the thermocline/nutricline featured three prominent phases: 1) phase I (1.5–1.1 Ma), which was characterized by low-amplitude variations in a shallow thermocline; 2) phase II (1.1–0.8 Ma), which was characterized by high-amplitude variations in a relatively shallow thermocline/nutricline; and 3) phase III (0.8–0.5 Ma), which was characterized by low-amplitude variations in a deep thermocline/nutricline. Combined with the zonal sea surface temperature gradient in the tropical Pacific, the evolution of the upper water structure can be linked to tropical climatic changes across the MPT, including the intensification of atmospheric circulation and a gradual cessation of the long-term El Niño-like state. The upper water structure of the WPWP was asymmetric before 0.8 Ma, with a shallow thermocline/nutricline along the northern margin and a deep thermocline/nutricline in the center of the WPWP and South China Sea (SCS). The modern WPWP was established by approximately 0.8 Ma, and the upper water structure has changed synchronously as a whole since that time. A comparison of the δ18O values derived from Globigerinoides ruber tests from the MD06–3050 core with those from other cores in the western Pacific suggests that the lower glacial/interglacial G. ruber δ18O values in MD06-3050 before 0.8 Ma could be related to the enhancement of the WPWP and to changes in atmospheric circulation patterns. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67771
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, Qingdao, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; State key Laboratory of Marine Geology, Tongji University, Shanghai, China; School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, China; Qingdao Institute of Marine Geology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Sun H.,Li T.,Liu C.,et al. Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,483