A near-field sea level record of East Antarctic Ice Sheet instability from 32 to 27 Myr
A near-field sea level record of East Antarctic Ice Sheet instability from 32 to 27 Myr
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DOI：
10.1029/2012pa002326
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
S. Gallagher;G. Villa;R. Drysdale;B. Wade;H. Scher;Qianyu Li;M. Wallace;G. Holdgate
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文献类型：
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作者：
S. Gallagher;G. Villa;R. Drysdale;B. Wade;H. Scher;Qianyu Li;M. Wallace;G. Holdgate
[1]早期高古纬度（55°S）剖面的化石、岩相和同位素分析表明，从3200万年到2700万年，南极东部冰盖高度不稳定。这片冰盖从现在体积的140%到40%的增减导致海平面变化+25米（范围从-30到+50米），这与周期性的冰期（10万到20万年）和较短的间冰期事件有关。近场吉普斯兰海平面（GSL）曲线与远场新泽西海平面（NJSL）估计有许多相似之处。然而，由于生物年代学、埋藏学和古深度估计以及相对缺乏低位沉积物（在NJSL），可能存在分辨率误差，这阻止了与GSL的详细相关性。尽管如此，GSL剖面和NJSL记录之间的海平面横向变化表明海洋虹吸和反虹吸可能传播了同步但可变的海平面。
[1] Fossil, facies, and isotope analyses of an early high-paleolatitude (55°S) section suggests a highly unstable East Antarctic Ice Sheet from 32 to 27 Myr. The waxing and waning of this ice sheet from 140% to 40% of its present volume caused sea level changes of +25 m (ranging from -30 to +50 m) related to periodic glacial (100,000 to 200,000 years) and shorter interglacial events. The near-field Gippsland sea level (GSL) curve shares many similarities to the far-field New Jersey sea level (NJSL) estimates. However, there are possible resolution errors due to biochronology, taphonomy, and paleodepth estimates and the relative lack of lowstand deposits (in NJSL) that prevent detailed correlations with GSL. Nevertheless, the lateral variations in sea level between the GSL section and NJSL record that suggest ocean siphoning and antisiphoning may have propagated synchronous yet variable sea levels.