Rock clock synchronization
Rock clock synchronization
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DOI：
10.1038/ngeo197
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发表时间：
2008-05
影响因子：
18.3
通讯作者：
H. Pälike;F. Hilgen
中科院分区：
文献类型：
--
作者：
H. Pälike;F. Hilgen
在地球科学界和气候模型界，迫切需要更好地了解气候和地质事件的持续时间和年龄，例如古新世-始新世最高温度(∼，5500万年前)。流入和流出海洋碳库的通量的准确年代和时间可以区分相互竞争的气候变化假说。对地球历史的高度详细的重建使我们能够评估过去的气候变化是否可以作为海洋酸化和气候的当前和未来变化的类比。地球时间项目是一项国际努力，其目标是进一步寻求一个校准良好和稳定的时间尺度，以便能够对岩层和矿物进行更精确的测年1.放射性同位素测年方法有微小但严重的误差，这阻碍了我们评估地质上短暂的气候事件的能力。例如，新生代最广泛使用的方法是40Ar/39Ar，误差高达2.5%，几乎没有已知年龄的连接点。然而，在过去20年里，在利用古气候记录中地球轨道变化的印记方面取得了很大进展。这极大地提高了循环计数和模式匹配等方法的潜在年龄分辨率，在新生代的大部分时间内都不到40,000年(过去的∼6600万年，图1)。
The need for much improved knowledge of the durations and ages of climatic and geological events, such as the Palaeocene–Eocene Thermal Maximum (∼ 55 million years ago), has become urgent within the Earth science and climate modelling communities. The exact dating and timing of fluxes into and out of the marine carbon reservoir can differentiate between competing hypotheses of climatic change. Highly detailed reconstructions of the Earth's history allow us to assess whether past climatic change can be used as an analogue for the current and future change of ocean acidification and climate. The Earthtime project is an international effort with the goal to further this quest for a well calibrated and stable timescale that will allow more precise dating of rock layers and minerals 1.Radioisotopic dating methods have small but significant errors that hinder our ability to assess geologically short-lived climate events. For instance, the most widely used method for the Cenozoic era is 40 Ar/39 Ar, which has an error of up to 2.5% and few tie points of known age. Yet, over the last two decades much progress has been made in exploiting the imprint of the Earth's orbital variations in palaeoclimatic records. This has dramatically increased the potential age resolution of approaches like cycle-counting and pattern matching, to less than 40,000 years throughout much of Cenozoic time (the past∼ 66 million years, Fig. 1).