颗石藻指示的东北印度洋90°E海岭末次冰期以来海洋初级生产力变化*

doi:10.11978/2024244

Abstract

Abstract:

The climate and surface currents of the northeastern Indian Ocean are controlled by the Indian Monsoon. Its marine primary productivity is the foundation of the ecosystem and connects the atmosphere and ocean carbon cycles. In this study, we carried out a quantitative analysis of coccolith from the marine sediments in Core I105A on the 90°E Ridge in the northeastern Indian Ocean. By examining variations in coccolith absolute abundance and the relative percentages of dominant coccolithophore species, we reconstructed marine primary productivity changes in the northeastern Indian Ocean since the Last Glacial Period. The results show that marine primary productivity in this area experienced three stages since last 54 ka: (1) relatively high during the last glaciation; (2) significantly decreased during the deglaciation; and (3) maintained at low levels during the Holocene. This pattern is generally consistent with the variations of other paleoproductivity proxies in the Bay of Bengal. Comparison with paleoenvironmental records from the Indian Ocean indicates that marine primary productivity decreased when freshwater input to the northeastern Indian Ocean increased due to intensified Indian Summer Monsoon. These findings imply that the evolution of marine primary productivity in the northeastern Indian Ocean since the last glaciation has most probably been driven by seawater stratification associated with Indian Summer Monsoon precipitation, a process regulated by the Earth orbital precession cycle as well.

Key words: northeastern Indian Ocean, coccolithophore, primary productivity, Indian Monsoon

CLC Number:

P736.221

SU Xiang, XIANG Rong, ZHANG Lanlan, LUO Chuanxiu, LIU Jianguo, WAN Sui, LI Zaigui, NILUFAR Yasmin Liza. Evolution of marine primary productivity on the 90°E Ridge in the northeastern Indian Ocean since the Last Glacial Period: Insights from coccolith records^⁎[J].Journal of Tropical Oceanography, 2026, 45(1): 131-139.

Figures/Tables 4

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Evolution of marine primary productivity on the 90°E Ridge in the northeastern Indian Ocean since the Last Glacial Period: Insights from coccolith records^⁎

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Evolution of marine primary productivity on the 90°E Ridge in the northeastern Indian Ocean since the Last Glacial Period: Insights from coccolith records⁎

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Evolution of marine primary productivity on the 90°E Ridge in the northeastern Indian Ocean since the Last Glacial Period: Insights from coccolith records^⁎