Huang Enqing, Wang Pinxian, Wang Yue, Yan Mi, Tian Jun, Li Shihan, Ma Wentao
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China.
Key Laboratory for Virtual Geographic Environment, School of Geography, Nanjing Normal University, Nanjing 210023, China.
Sci Adv. 2020 Oct 7;6(41). doi: 10.1126/sciadv.aba4823. Print 2020 Oct.
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 δO 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.
寻找地质代用指标以评估行星尺度上的低纬度水文变化仍是一个悬而未决的问题。多尔效应因其全球性特征而成为这样一个潜在的代用指标。我们提出了一种新方法来重新计算过去80万年（ka）里多尔效应（∆DE*）的波动情况。以这种方式计算出的∆DE仅受岁差周期主导，在倾角带中的变化较小，而在偏心率带中几乎没有变化。此外，∆DE与过去64万年中国石笋δO记录显著相关；模拟了过去30万年里北纬30°和南纬30°之间的陆地降雨变化。我们的研究结果突出了低纬度水文气候在轨道时间尺度上对∆DE的主导作用，而高纬度气候影响可忽略不计。反过来，我们认为∆DE可用于指示全球范围内的低纬度水文变化。
