A 2,200 years periodicity in the Asian monsoon system

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doi: 10.1029/95GL02558
Author(s): Naidu, Pothuri Divakar; Malmgren, Bjorn A.
Author Affiliation(s): Primary:
University of Goteborg, Department of Marine Geology, Goteborg, Sweden
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 22(17), p.2361-2364. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 33 refs.; illus., incl. 1 table
Summary: We have carried out a high-resolution study of fluctuations in upwelling intensity along the Oman Margin, western Arabian Sea, through the last 19,130 years based on several marine microfossil indices of upwelling. We document a periodicity of 2,200 years in the upwelling indices, which would be governed by the south-west (SW) monsoon with such a periodicity. Our data further demonstrate greater amplitude in the variability of the SW monsoon during the Holocene than during the last glacial period. Our reported 2,200 years periodicity has two implications (1) oceanic circulation changes partly influence monsoon strength at sub-Milankovitch cycles (2) previously documented 2,300 years periodicity in atmospheric 14C might be induced by oceanic circulation changes. Copyright 1995 by the American Geophysical Union.
Year of Publication: 1995
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Arabian Peninsula; Arabian Sea; Asia; Biostratigraphy; Cenozoic; Climate; Continental margin; Foraminifera; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; Holocene; Indian Ocean; Indicators; Invertebrata; Leg 117; Marine environment; Microfossils; Milankovitch theory; Monsoons; ODP Site 723; Ocean Drilling Program; Oman; Paleoecology; Periodicity; Planktonic taxa; Pleistocene; Protista; Quaternary; Rotaliina; Sedimentation; Sedimentation rates; Upper Pleistocene; Upwelling
Coordinates: N180304 N180305 E0573634 E0573633
Record ID: 1996001801
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