International Journal of Marine Science, 2024, Vol.14, No.2, 51-56 http://www.aquapublisher.com/index.php/ijms 55 Figure 5 Schematic illustrating key atmospheric and oceanic processes influencing million-year trends in ACC strength 2 Analysis of Research Results The study reveals that changes in ACC strength are closely connected to Earth's orbital parameters, especially the approximately 400 000-year eccentricity cycles of Earth’s orbit. This finding suggests that the long-term variations of the ACC are influenced not only by local oceanic processes but also by global climatic changes driven by Earth's orbital cyclical changes. Under the regulation of orbital cycles, changes in the South Pacific Jet might adjust ACC strength by altering wind-driven ocean surface circulation and the pattern of deep water upwelling, further influenced by temperature variability in the tropical Pacific. The variations in ACC strength are closely related to the development of the Antarctic ice sheet. Periods of weakened ACC strength typically correspond to the expansion of the West Antarctic ice sheet. This could be due
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