| Summary: | The Miocene Climatic Optimum (MCO) disrupted long-standingcooling trendwitha significant temperature risedue to elevatedgreenhouse gases. However,the dynamicsof hydrological circulation and orbital influences during this epochin eastern Asia remainunderexplored.Employingmagneto-cyclostratigraphic chronology, we analyzed samples from a 120-meter-thick section in inland Asia. Our findings highlight the profound influence of two orbital cycles on the MCO: the dominant 405-kyr eccentricity and the subtler 173-kyr obliquity band. These patterns shiftedthe summer movement of the Intertropical Convergence Zone in East Asia, impactingnorthwardmoisture transport. Notably, we identified six drought events correlating with global phenomena like Antarctic coolingevents and the Monterey Excursion. Enhanced bylatitudinal insolation gradients, our results provideinsights into climate variations on both regional and global scales, with implications for past and potential future scenarios.
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