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首页> 外文期刊>Paleoceanography >Assessing El Ni?o Southern Oscillation variability during the past millennium
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Assessing El Ni?o Southern Oscillation variability during the past millennium

机译：评估过去千年中厄尔尼诺现象的南方涛动变化

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摘要

We present a reconstruction of El Nio Southern Oscillation (ENSO) variability spanning the Medieval Climate Anomaly (MCA, A.D. 800-1300) and the Little Ice Age (LIA, A.D. 1500-1850). Changes in ENSO are estimated by comparing the spread and symmetry of δ~(18)O values of individual specimens of the thermocline-dwelling planktonic foraminifer Pulleniatina obliquiloculata extracted from discrete time horizons of a sediment core collected in the Sulawesi Sea, at the edge of the western tropical Pacific warm pool. The spread of individual δ~(18)O values is interpreted to be a measure of the strength of both phases of ENSO while the symmetry of the δ~(18)O distributions is used to evaluate the relative strength/frequency of El Ni?o and La Ni?a events. In contrast to previous studies, we use robust and resistant statistics to quantify the spread and symmetry of the δ~(18)O distributions; an approach motivated by the relatively small sample size and the presence of outliers. Furthermore, we use a pseudo-proxy approach to investigate the effects of the different paleo-environmental factors on the statistics of the δ~(18)O distributions, which could bias the paleo-ENSO reconstruction. We find no systematic difference in the magnitude/strength of ENSO during the Northern Hemisphere MCA or LIA. However, our results suggest that ENSO during the MCA was skewed toward stronger/more frequent La Ni?a than El Ni?o, an observation consistent with the medieval megadroughts documented from sites in western North America.
机译：我们提出了跨越中世纪气候异常（MCA，A.D. 800-1300）和小冰河时代（LIA，A.D. 1500-1850）的厄尔尼诺南方涛动（ENSO）变异性的重建方法。 ENSO的变化是通过比较从位于苏拉威西海边缘的苏拉威西海沉积岩心的离散时间范围中提取的温跃层浮游有孔虫有孔轮虫Pulleniatina obliquiloculata各个标本的δ〜（18）O值的分布和对称性来估算的西部热带太平洋暖池。 δ〜（18）O值的散布被解释为ENSO两相强度的量度，而δ〜（18）O分布的对称性用于评估El Ni？的相对强度/频率。 o和La Ni？a事件。与以前的研究相比，我们使用可靠的统计数据来量化δ〜（18）O分布的分布和对称性。由相对较小的样本量和异常值引起的方法。此外，我们使用伪代理方法研究了不同的古环境因素对δ〜（18）O分布统计的影响，这可能会影响古ENSO的重建。我们发现北半球MCA或LIA期间ENSO的强度/强度没有系统的差异。但是，我们的结果表明，MCA期间的ENSO偏向比Ni Nio更强或更频繁的La Ni？a，这一发现与北美西部地区记载的中世纪大干旱相符。

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