Comparison between Holocene and Marine Isotope Stage-11 sea-level histories
Comparison between Holocene and Marine Isotope Stage-11 sea-level histories
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DOI：
10.1016/j.epsl.2009.12.054
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发表时间：
2010-03
影响因子：
5.3
通讯作者：
E. Rohling;Kerstin Braun;K. Grant;M. Kučera;A. Roberts;M. Siddall;G. Trommer
中科院分区：
文献类型：
--
作者：
E. Rohling;Kerstin Braun;K. Grant;M. Kučera;A. Roberts;M. Siddall;G. Trommer
极长的间冰期暖期被称为海洋同位素第11阶段(MIS-11；428-397 ky ago vs.Ky vs.KYR)，通常被认为是在没有人类影响的情况下未来气候发展的潜在类比。我们使用一种新的高分辨率海平面记录--全球集成的冰量信号--来比较MIS-11和当前的间冰期(全新世)。结果表明，两个间冰期的海平面上升开始于与各自日照强度增加相似的时间尺度上，并以类似的1-1.2m/世纪的速度发展到−50m。随后的弱日照变化异常地延长了MIS-11冰川消融超过20ky。主要海平面高位是在第二个MIS-11日照最高时达到的，与其单一日照最大值相比，其时间几乎相当于全新世高位。因此，虽然MI-11是一个非常长的间冰期暖期，但它的冰量最低/海平面高位持续时间不到10ky，这与其他主要间冰期的持续时间相似。根据6月21日在65°N的平均日照时间与它们各自最大值的时间进行比较，表明全新世条件的结束可能在2.0-2.5ky之前就已经预料到了。相反，间冰期条件仍在继续，二氧化碳、温度和海平面保持在较高水平或不断上升。这种明显的差异突出表明有必要考虑：(A)比较可能需要侧重于其他轨道控制指数，在这种情况下，差异可以消失；和/或(B)在过去2000年中，主导行星能量平衡的反馈机制可能已经与太阳辐射脱钩。
The exceptionally long interglacial warm period known as Marine Isotope Stage 11 (MIS-11; 428–397ky ago vs. ky vs. kyr) is often considered as a potential analogue for future climate development in the absence of human influence. We use a new high-resolution sea-level record—a globally integrated ice-volume signal—to compare MIS-11 and the current interglacial (Holocene). It is found that sea-level rise into both interglacials started over similar timescales relative to the respective insolation increases, and progressed up to −50m at similar rates of 1.0–1.2m per century. Subsequent weak insolation changes anomalously prolonged the MIS-11 deglaciation over more than 20ky. The main sea-level highstand was achieved at the second MIS-11 insolation maximum, with a timing closely equivalent to that of the Holocene highstand compared to its single insolation maximum. Consequently, while MIS-11 was an exceptionally long period of interglacial warmth, its ice-volume minimum/sea-level highstand lasted less than 10ky, which is similar to the duration of other major interglacials. Comparison of the ends of MIS-11 and the Holocene based on timings relative to their respective maxima in mean 21 June insolation at 65°N suggests that the end of Holocene conditions might have been expected 2.0–2.5ky ago. Instead, interglacial conditions have continued, with CO2, temperature, and sea level remaining high or increasing. This apparent discrepancy highlights the need to consider that: (a) comparisons may need to focus on other orbital control indices, in which case the discrepancy can vanish; and/or (b) the feedback mechanisms that dominate the planetary energy balance may have become decoupled from insolation during the past 2millennia.