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首页> 外文期刊>Geophysical Research Letters >A 20th century acceleration of sea-level rise in New Zealand
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A 20th century acceleration of sea-level rise in New Zealand

机译:20世纪新西兰海平面上升加速

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Sea levels in New Zealand have remained relatively stable throughout the past 7000 years, but salt- marsh cores from southern New Zealand show evidence of a recent rapid rise. To date and quantify this rise we present a proxy sea- level record spanning the past 500 years for Pounawea, southeastern New Zealand, based on foraminiferal analyses. Ages for ten sea- level index points are established from AMS C-14, Pb concentrations, stable Pb isotopes, pollen markers, charcoal concentrations and Cs-137. Sea level was rising slowly ( 0.3 +/- 0.3mm yr(-1)) from AD 1500 to AD1900, but during the 20th century the rate increased to 2.8 +/- 0.5 mm yr(-1), in agreement with instrumental measurements commencing in 1924. This is the first sea- level record from the southern hemisphere showing a significantly higher rate of sea- level rise during the 20th century as compared with preceding centuries.
机译:在过去的7000年中,新西兰的海平面一直保持相对稳定,但来自新西兰南部的盐沼岩心显示出近期迅速上升的迹象。迄今为止,根据有孔虫分析,我们呈现了新西兰东南部Pounawea过去500年的代理海平面记录。根据AMS C-14,Pb浓度,稳定的Pb同位素,花粉标记,木炭浓度和Cs-137确定了十个海平面指数点的年龄。从公元1500年到公元1900年,海平面缓慢上升(0.3 +/- 0.3mm yr(-1)),但在20世纪,速率上升到2.8 +/- 0.5 mm yr(-1),与仪器测量结果一致从1924年开始。这是南半球的第一个海平面记录,显示20世纪与以前的世纪相比,海平面上升的速度明显更高。

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