Earth's eccentricity cycles and Indian summer monsoon variability over the past 2 million years; evidence from deep-sea benthic foraminifer

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doi: 10.1029/2001GL013315
Author(s): Gupta, Anil K.; Dhingra, Hitesh; Mélice, Jean-Luc; Anderson, David M.
Author Affiliation(s): Primary:
Indian Institute of Technology, Department of Geology and Geophysics, Kharagpur, India
Other:
Université Pierre et Marie Curie, France
NOAA Paleoclimatology Program, United States
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 28(21), p.4131-4134. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 45 refs.; illus.
Summary: Spectral analysis of a Uvigerina proboscidea time series from DSDP Site 214 using the Lomb-Scargle method for unevenly sampled data, exhibits two dominant power peaks at 412 and 94 kyrs over the last 2 million years, which correspond to the Earth's eccentricity cycles. The results indicate that the SW monsoon varied at about 100 kyr and 400 kyr periodicities within Earth's eccentricity domain (Milankovitch range) over the past 2 million years. Wavelet transform analysis reveals the non-stationary nature of monsoon upwelling over this interval. The amplitude of the 400 kyr cycle in the U. proboscidea time series began to increase at ∼900 kyrs as has also been observed in few recent studies. We do not see a strong relation between eccentricity highs and intense summer monsoons over the studied interval.
Year of Publication: 2001
Research Program: DSDP Deep Sea Drilling Project
Key Words: 24 Surficial Geology, Quaternary Geology; Benthic taxa; Buliminacea; Cenozoic; Climate change; Cycles; DSDP Site 214; Deep Sea Drilling Project; Deep-sea environment; Eccentricity; Foraminifera; Holocene; Indian Ocean; Invertebrata; Leg 22; Lomb-Scargle method; Marine environment; Microfossils; Monsoons; Periodicity; Pleistocene; Protista; Quaternary; Rotaliina; Spectral analysis; Statistical analysis; Time series analysis; Uvigerina; Uvigerina proboscidea; Uvigerinidae
Coordinates: S112013 S112013 E0884305 E0884305
Record ID: 2002057444
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