Paleoclimate change derived from the natural gamma-logging curve in the Qaidam Basin and its relationship to solar insolation

Author(s): Yuan Linwang; Liu Zechun; Chen Ye
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, China
Volume Title: Bingchuan Dongtu Journal of Glaciology and Geocryology
Source: Bingchuan Dongtu = Journal of Glaciology and Geocryology, 26(3), p.298-304. Publisher: Science Press, Beijing, China. ISSN: 1000-0240
Note: In Chinese with English summary. 28 refs.; illus., incl. 1 table
Summary: The astronomical theory of climate has provided a very powerful means for developing accurate time scales. Using orbital tuning methods, a millennial-resolution time scale of the Dacan-1 core is established for the past 2.85 Ma for a 3200-meter-long logging curve of lake sediments in the Qaidam Basin, Western China. By analyzing multi-dimensional spectra and a singular spectrum of the logging curve and other climate records from deep-sea deposits (the δ18O curve of ODP Site 677, ODP Site 659, ODP Site 758 and the ice volume simulated curve) and Chinese loess deposits (grain size of the Baoji loess-soil sequence), a significant difference in periodic features is found between the Qaidam record and the deep-sea record and the loess deposits. The climate change reflected in the time-domain spectrum of the Qaidam record lagged that found in the deep-sea and loess deposits by 3-4 ka. Furthermore, frequency-domain analyses and a combination of singular spectrum analyses illustrate that the signal of the processional domain in the Qaidam record is stronger than that in other deep-sea and loess records. This suggests that long-term climate change in the basin has been strongly influenced by variations in processional-scale orbital insolation, as previously discovered in the low-latitude climatic regime. Deep-sea records and loess records have been strongly influenced by obliquity cycle changes. It is pointed that the processional cycles in the logging curve over the past 2.85 Ma are quite different from those in deep-sea and loess deposits.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 20 Geophysics, Applied; 24 Surficial Geology, Quaternary Geology; Asia; Atlantic Ocean; Cape Verde Rise; Cenozoic; China; Clastic sediments; Climate change; East Pacific; Equatorial Pacific; Far East; Gamma-ray methods; Geophysical methods; Geophysical surveys; Glacial environment; Indian Ocean; Insolation; Interglacial environment; Lacustrine environment; Lake sediments; Leg 108; Leg 111; Leg 121; Loess; Ninetyeast Ridge; North Atlantic; North Pacific; Northeast Pacific; ODP Site 659; ODP Site 677; ODP Site 758; Ocean Drilling Program; Pacific Ocean; Paleoclimatology; Paleosols; Qaidam Basin; Quaternary; Sediments; Solar radiation; Surveys; Upper Quaternary; Well-logging
Coordinates: N180437 N183438 W0210134 W0210135
N011203 N011209 W0834413 W0834414
N052302 N052303 E0902141 E0902140
Record ID: 2009048714
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