Linking ocean and continental records of paleoclimate; determining accord and discord in the records

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doi: 10.1139/e00-044
Author(s): Rack, Frank R.; Rutter, Nathaniel W.; Bush, Andrew; Rokosh, Dean; Ding Zhongli
Author Affiliation(s): Primary:
Joint Oceanographic Institutions, Washington, DC, United States
University of Alberta, Canada
Academica Sinica, China
Volume Title: Climate System History and Dynamics Program; CSHD--Le programme Historique et dynamique du système climatique
Volume Author(s): Peltier, W. Richard, editor
Source: The Climate System History and Dynamics Program; CSHD--Le programme Historique et dynamique du système climatique, edited by W. Richard Peltier. Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 37(5), p.831-848. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077 CODEN: CJESAP
Note: In English with French summary. 70 refs.; illus., incl. charts, sketch maps
Summary: Climate forcing at Milankovitch and sub-Milankovitch frequencies are evaluated by linking climate proxy data from terrestrial and ocean records at two scales of temporal resolution: (1) relatively coarse resolution over the last 500 ka, and (2) higher resolution over the last 200 ka. We determine that climate proxy data from Hole 810C represent regional atmospheric and oceanic processes by comparison to core V21-146, both from the northwest Pacific Ocean. We then compare records that represent regional deposition from China and the western Pacific Ocean to focus on determining Milankovitch-type periodicities. Grain-size and magnetic susceptibility data from Hole 810C and Baoji, China are contrasted using a time-sensitive wavelet analysis. The analyses indicate a general correspondence to Milankovitch frequencies, although there is no specific frequency that dominates throughout the records. Additionally, the dominant 100 000 year frequency does not occur at the same time in the records. These factors suggest that differences in the physical mechanisms of deposition may influence the preserved apparent periodicities in these environments. Lastly, climate events over the last 200 000 years in marine and terrestrial records are correlated at a high resolution in the depth domain. The last interglacial-glacial boundary is consistently placed at the base of a cold period (C20) in the terrestrial and marine records. However, the cold period in the ocean data (δ18O) is very subdued relative to terrestrial records. Additionally, over the last 200 ka, periods of minimum insolation intensity do not correspond linearly to periods of maximum grain-size and ice volume variations revealed in the loess and ocean records, respectively. However, during the warm interstadials of the last two glaciations, peaks in insolation intensity compare favourably with the times of strongest pedogenic development in the continental records and minimum ice volume in the ocean records.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Asia; Cenozoic; China; Clastic sediments; Cores; Far East; Glacial environment; Glaciomarine environment; Insolation; Interglacial environment; Leg 132; Loess; Loess Plateau; Magnetic susceptibility; Marine environment; Marine sediments; Milankovitch theory; North Pacific; Northwest Pacific; ODP Site 810; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Pedogenesis; Periodicity; Quaternary; Sedimentation rates; Sediments; Terrestrial environment; West Pacific
Coordinates: N322521 N322524 E1575045 E1575043
Record ID: 2000063866
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