Reorganization of Pacific deep waters linked to middle Miocene Antarctic cryosphere expansion; a perspective from the South China Sea

Online Access: Get full text
doi: 10.1016/j.palaeo.2009.10.019
Author(s): Tian Jun; Shevenell, Amelia; Wang Pinxian; Zhao Quanhong; Li Qianyu; Cheng Xinrong
Author Affiliation(s): Primary:
Tongji University, State Key Laboratory of Marine Geology, Shanghai, China
Other:
University College London, United Kingdom
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 284(3-4), p.375-382. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 55 refs.; illus., incl. 1 table, sketch map
Summary: Changes in intermediate and deep ocean circulation likely played a significant role in global carbon cycling and meridional heat/moisture transport during the middle Miocene climate transition (∼14Ma). High-resolution middle Miocene (16-13Ma) benthic foraminifer stable isotope records from the South China Sea reveal a reorganization of regional bottom waters, which preceded the globally recognized middle Miocene ∼1 ppm δ18O increase (13.8Ma) by 100,000 years. An observed reversal of the benthic foraminifera δ13C gradient between ODP Sites 1146 (2092m) and 1148 (3294m; 13.9-13.5Ma) is interpreted to reflect an increase in the southward flux of low δ13C deep (>2000m) Pacific Ocean waters (Flower and Kennett, 1993; Shevenell and Kennett, 2004). Large-scale changes in Pacific intermediate and deep ocean circulation, coupled with enhanced global carbon cycling at the end of the Monterey Carbon Isotope excursion, likely acted as internal feedbacks to the Earth's climate system. These feedbacks reduced the sensitivity of Antarctica to lower latitude-derived heat/moisture and facilitated the transition of the Earth's climate system to a new, relatively stable glacial state. Abstract Copyright (2009) Elsevier, B.V.
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctica; Benthic taxa; Biochemistry; C-13/C-12; Carbon; Carbon cycle; Cenozoic; Climate change; Cooling; Cryosphere; Deep-sea environment; Foraminifera; Geochemical cycle; Geochemistry; Glacial environment; Glacial extent; Glaciomarine environment; Global change; High-resolution methods; Invertebrata; Isotope ratios; Isotopes; Leg 184; Marine environment; Microfossils; Middle Miocene; Miocene; Neogene; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1146; ODP Site 1148; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleocirculation; Paleoclimatology; Protista; South China Sea; Stable isotopes; Tertiary; West Pacific
Coordinates: N192724 N192724 E1161622 E1161622
N185010 N185010 E1163356 E1163356
Record ID: 2010028843
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands