enqing huang1,*, pinxian wang1, yue wang1, mi yan2, jun tian1, shihan li1 and wentao ma1,3
1 state key laboratory of marine geology, tongji university, shanghai 200092, china.
2 key laboratory for virtual geographic environment, school of geography, nanjing normal university, nanjing 210023, china.
3 state key laboratory of satellite ocean environment dynamics, second institute of oceanography, hangzhou 310012, china.
↵* corresponding author. email:
abstract
the quest of geological proxies to evaluate low-latitude hydrological changes at a planetary scale remains an ongoing issue. the dole effect is such a potential proxy owing to its global character. we propose a new approach to recalculate the fluctuation of the dole effect (∆de*) over the past 800 thousand years (ka). the ∆de* calculated this way is dominated by precession cycles alone, with lesser variance in the obliquity bands and almost no variance in the eccentricity bands. moreover, the ∆de* is notably correlated with chinese stalagmite δ18o record over the past 640 ka; simulated terrestrial rainfall changes between 30°n and 30°s over the past 300 ka. our findings highlight the predominant role of the low-latitude hydroclimate in governing the ∆de* on orbital time scales, while high-latitude climate impacts are negligible. in turn, we argue that the ∆de* can be used to indicate low-latitude hydrological changes at a global extent.
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