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Timing of Sierra Nevadan stadial/interstadial variations from 15 to 56 ka
Quaternary International ( IF 1.9 ) Pub Date : 2021-03-04 , DOI: 10.1016/j.quaint.2021.02.007
Steve Lund , Larry Benson , Rob Negrini

We summarize proxy evidence for stadial/interstadial variability recorded in sediments of three Great Basin lakes – Owens, Mono, and Pyramid. These lakes lie along the eastern margin of the Sierra Nevada Ice Sheet and record environmental variability associated with it. We have applied new paleomagnetic secular variation measurements (PSV) to more carefully date the lake environmental variability. We have also used PSV to correlate the Great Basin environmental variability to North Atlantic records of oxygen isotope variability. We see evidence for 25 cycles in stadial/interstadial variability of the Great Basin lakes. These cycles can be correlated among all three lakes and are largely synchronous. We can also date the individual stadial and interstadial intervals present in the three lakes. They have an average cycle duration of 1430 ± 530 years. But, the cycle durations in all three lakes vary coherently from less than 1000 years to more than 2000 years between 20 and 56 ka. The variability in cycle duration suggests internal variability in the global climate engine as the cause of the observed variability rather than some (presumably more periodic) external forcing. We also correlate interstadial D/O cycles 2–16 recorded in the Atlantic Ocean region with interstadial intervals in the Great Basin lakes. These intervals are largely synchronous between the two regions. We see evidence of 5 more Great Basin lake interstadials synchronous with un-numbered light δ18O intervals in the Atlantic oxygen isotope stratigraphy. This suggests some kind of linkage between the North Atlantic and North Pacific climate variability during the period 15–56 ka.



中文翻译:

内华达山脉恒星/星际变化的时间从15到56 ka

我们总结了三个大盆地湖泊(欧文斯,莫诺和金字塔)的沉积物中记录的星际/星际间变化的代理证据。这些湖泊位于内华达山脉冰原的东边缘,并记录了与之相关的环境变化。我们已应用新的古磁长期变化测量(PSV)来更仔细地确定湖泊的环境变化。我们还使用PSV将大盆地的环境变异性与北大西洋的氧同位素变异性记录相关联。我们看到大盆地湖泊的地缘/际间变化有25个周期的证据。这些周期可以在所有三个湖泊之间关联,并且在很大程度上是同步的。我们还可以对这三个湖中存在的单个静止和静止间隔进行测年。它们的平均周期持续时间为1430±530年。但是,所有三个湖泊的周期持续时间在20至56 ka之间从不到1000年到超过2000年一致地变化。周期持续时间的可变性表明,全球气候引擎的内部可变性是观测到的可变性的原因,而不是某些(可能是更周期性的)外部强迫。我们还将大西洋地区记录的星际间D / O周期2-16与大盆地湖中的星际间隔相关联。在两个区域之间,这些间隔在很大程度上是同步的。我们看到在大西洋氧同位素地层中还有另外5个大盆地湖际与无编号的δ18O间隔同步的证据。这表明在15–56 ka期间北大西洋和北太平洋气候变异之间存在某种联系。这三个湖泊的周期持续时间在20至56 ka之间从不到1000年到超过2000年一致地变化。周期持续时间的可变性表明,全球气候引擎的内部可变性是观测到的可变性的原因,而不是某些(可能是更周期性的)外部强迫。我们还将大西洋地区记录的星际间D / O周期2-16与大盆地湖中的星际间隔相关联。在两个区域之间,这些间隔在很大程度上是同步的。我们看到在大西洋氧同位素地层中还有另外5个大盆地湖际与无编号的δ18O间隔同步的证据。这表明在15–56 ka期间北大西洋和北太平洋气候变异之间存在某种联系。这三个湖泊的周期持续时间在20至56 ka之间从不到1000年到超过2000年一致地变化。周期持续时间的可变性表明,全球气候引擎的内部可变性是观测到的可变性的原因,而不是某些(可能是更周期性的)外部强迫。我们还将大西洋地区记录的星际间D / O周期2-16与大盆地湖中的星际间隔相关联。在两个区域之间,这些间隔在很大程度上是同步的。我们看到在大西洋氧同位素地层中还有另外5个大盆地湖际与无编号的δ18O间隔同步的证据。这表明在15–56 ka期间北大西洋和北太平洋气候变异之间存在某种联系。

更新日期:2021-04-02
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