海平面在五个冰期循环中的变化。

Sea-level variability over five glacial cycles.

机构信息

Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 0200, Australia.

1] Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 0200, Australia [2] School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, UK.

出版信息

Nat Commun. 2014 Sep 25;5:5076. doi: 10.1038/ncomms6076.

DOI:10.1038/ncomms6076

PMID:25254503

Abstract

Research on global ice-volume changes during Pleistocene glacial cycles is hindered by a lack of detailed sea-level records for time intervals older than the last interglacial. Here we present the first robustly dated, continuous and highly resolved records of Red Sea sea level and rates of sea-level change over the last 500,000 years, based on tight synchronization to an Asian monsoon record. We observe maximum 'natural' (pre-anthropogenic forcing) sea-level rise rates below 2 m per century following periods with up to twice present-day ice volumes, and substantially higher rise rates for greater ice volumes. We also find that maximum sea-level rise rates were attained within 2 kyr of the onset of deglaciations, for 85% of such events. Finally, multivariate regressions of orbital parameters, sea-level and monsoon records suggest that major meltwater pulses account for millennial-scale variability and insolation-lagged responses in Asian monsoon records.

摘要

研究更新世冰期循环过程中的全球冰量变化受到限制，因为缺乏最后一次间冰期之前的详细海平面记录。在这里，我们根据与亚洲季风记录的紧密同步，提供了第一个可靠的、连续的和高度分辨率的红海海平面和过去 50 万年海平面变化率的记录。我们观察到，在与当前两倍的冰量相当的时期之后，最大的“自然”（人为因素之前的强迫）海平面上升率低于每百年 2 米，而对于更大的冰量，上升率则要高得多。我们还发现，在 85%的冰川消退事件中，最大的海平面上升率在冰川消退开始后的 2 千年内达到。最后，轨道参数、海平面和季风记录的多元回归表明，主要的融水脉冲解释了亚洲季风记录中的千年尺度变异性和太阳辐射滞后响应。