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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Geomagnetic paleointensity and environmental record from Labrador Sea core MD95-2024: global marine sediment and ice core chronostratigraphy for the last 110 kyr
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Geomagnetic paleointensity and environmental record from Labrador Sea core MD95-2024: global marine sediment and ice core chronostratigraphy for the last 110 kyr

机译：拉布拉多海心MD95-2024的地磁古强度和环境记录：最近110年的全球海洋沉积物和冰芯年代地层

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Piston core MD95-2024 from the Labrador Rise provides a continuous record of rapidly deposited detrital layers denoting Laurentide ice sheet (LIS) instability. The core also provides a high-resolution record of geomagnetic paleointensity, that is consistent with, but at higher temporal resolution than previous Labrador Sea records. Correlation to the Greenland Summit ice cores (GRIP/GISP2) is achieved by assuming that Labrador Sea detrital layers correspond to cold stadials in the ice cores. This allows a GISP2 official chronology to be placed on MD95-2024 which is consistent with the inverse correlation between paleointensity and the flux of cosmogenic isotopes (~(10)Be and ~(36)Cl) in Greenland ice cores. Synchronous millennial scale variability observed from the MD95-2024 paleointensity record and a North Atlantic paleointensity stack (NAPIS-75) [C. Laj et al., Philos. Trans. R. Soc. Ser. A 358 (2000) 1009-502], independently placed on the GISP2 official chronology [C. Kissel et al., Earth Planet. Sci. Lett. 171 (1999) 489-502], further support the sediment to ice core correlation. High-resolution paleointensity and oxygen isotope records from the North Atlantic, Mediterranean, Somali Basin, sub-Antarctic South Atlantic and the relative flux of ~(10)Be in Vostok (Antarctic) ice core are used to derive a common chronostratigraphy that neither violates the regional (millennial) or global (orbital) scale environmental stratigraphics. The resulting correlation circuit places the ice core and marine records on a common GISP2 official chronology, which indicates discrepancies as high as 5 kyr between the GISP2 and SPECMAP time scales. It further demonstrates that LIS instabilities in the Hudson Strait area are synchronous with cooling in the Greenland Summit ice cores and warming in the sub-Antarctic South Atlantic and in the Vostok ice core. Geomagnetic field intensity shows common global variance at millennial time scales which, in view of the out-of-phase interhemispheric climate variability, cannot be attributed to climatic contamination of the paleointensity records.
机译：来自拉布拉多（Labrador Rise）的活塞芯MD95-2024连续记录了迅速沉积的碎屑层，表明洛朗德冰盖（LIS）不稳定。岩心还提供了高分辨率的地磁古强度记录，该记录与以前的拉布拉多海记录一致，但时间分辨率更高。通过假定拉布拉多海碎屑层对应于冰芯中的低温地层，可以实现与格陵兰首脑会议冰芯（GRIP / GISP2）的相关性。这允许将GISP2官方年表放到MD95-2024上，这与格陵兰冰芯中古强度与宇宙成因同位素（〜（10）Be和〜（36）Cl）的通量之间的反相关一致。从MD95-2024古强度记录和北大西洋古强度堆栈（NAPIS-75）观察到的同步千年尺度变化[C. Laj等，Philos。反式R. Soc。老师358（2000）1009-502]，独立放置在GISP2官方年表中[C. Kissel等人，地球行星。科学来吧171（1999）489-502]，进一步支持了沉积物与冰芯的相关性。来自北大西洋，地中海，索马里盆地，南极次大陆南大西洋的高分辨率古强度和氧同位素记录以及在南极沃斯托克冰芯中的〜（10）Be相对通量被用于得出一个共同的年代地层区域（千年）或全球（轨道）规模的环境地层。最终的相关电路将冰芯和海洋记录放在通用的GISP2官方年表上，这表明GISP2和SPECMAP时标之间的差异高达5 kyr。这进一步表明，哈德逊海峡地区的LIS不稳定性与格陵兰顶峰冰芯的降温，南极次大陆南大西洋和沃斯托克冰芯的升温同步。地磁场强度在千禧年尺度上显示出普遍的全球变化，鉴于半球间气候的异相性，不能将其归因于古强度记录的气候污染。

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