Late Quaternary paleoproductivity histories near the mouth of the Congo River and the Benguela Current upwelling system, Southwest Africa margin

Author(s): Lin, Hui-Ling; Meyers, Philip A.; Lin, Chein-Yu
Author Affiliation(s): Primary:
National Sun Yat-Sen University, Institute of Marine Geology and Chemistry, Kaohsiung, Taiwan
Other:
University of Michigan at Ann Arbor, United States
Volume Title: Western Pacific Earth Sciences
Source: Western Pacific Earth Sciences, 3(2), p.113-150. Publisher: Geological Society in Taipei, Institute of Earth Sciences, Taipei, Taiwan. ISSN: 1609-901X
Note: In English. 58 refs.; illus., incl. sketch map
Summary: Concentrations of CaCO3, total organic carbon, opal, and organic matter δ13C values in sediments from ODP Sites 1075 and 1077 off the mouth of the Congo River and Sites 1082 and 1084 under the Benguela Current have been employed to compare the histories of marine productivity over the past 1200 ky in these two different but related upwelling systems. Productivity has generally been higher at Sites 1082 and 1084 than near the Congo River because of upwelling associated with the Benguela Current. A common decrease of opal MAR at all four sites at around 900 ka probably was caused by relaxation in intensity of southeast Trade Wind intensity, which decreased upwelling along the Namib Margin and lowered delivery of moisture to the West African Monsoon. Paleoproductivity has increased in both systems since 250 ka, indicating reinvigoration of Trade Wind intensity.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Africa; Atlantic Ocean; Benguela Current; C-13/C-12; Carbon; Carbonates; Cenozoic; Central Africa; Chemical composition; Congo River; Currents; Geochemistry; Holocene; Hydrology; Isotope ratios; Isotopes; Leg 175; Mineral composition; Namib Desert; Namibia; ODP Site 1075; ODP Site 1082; ODP Site 1084; Ocean Drilling Program; Ocean currents; Organic compounds; Paleoclimatology; Paleoenvironment; Quaternary; Rainfall; Sedimentation; Sedimentation rates; Sediments; South Atlantic; Southeast Atlantic; Southern Africa; Stable isotopes; Total organic carbon
Coordinates: S044707 S044707 E0100430 E0100430
S210539 S210539 E0114914 E0114914
S253049 S253049 E0130140 E0130140
Record ID: 2005019640
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