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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Precession and atmospheric CO2 modulated variability of sea ice in the central Okhotsk Sea since 130,000 years ago
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Precession and atmospheric CO2 modulated variability of sea ice in the central Okhotsk Sea since 130,000 years ago

机译：自13万年前以来，鄂霍次克海中央海冰的进展和大气二氧化碳调制变异性

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摘要

Recent reduction in high-latitude sea ice extent demonstrates that sea ice is highly sensitive to external and internal radiative forcings. In order to better understand sea ice system responses to external orbital forcing and internal oscillations on orbital timescales, here we reconstruct changes in sea ice extent and summer sea surface temperature (SSST) over the past 130,000 yrs in the central Okhotsk Sea. We applied novel organic geochemical proxies of sea ice (IP25), SSST (TEX(L)86) and open water marine productivity (a tri-unsaturated highly branched isoprenoid and biogenic opal) to marine sediment core MD01-2414 (53 degrees 11.77'N, 149 degrees 34.80'E, water depth 1123 m). To complement the proxy data, we also carried out transient Earth system model simulations and sensitivity tests to identify contributions of different climatic forcing factors. Our results show that the central Okhotsk Sea was ice-free during Marine Isotope Stage (MIS) 5e and the early-mid Holocene, but experienced variable sea ice cover during MIS 2-4, consistent with intervals of relatively high and low SSST, respectively. Our data also show that the sea ice extent was governed by precession-dominated insolation changes during intervals of atmospheric CO2 concentrations ranging from 190 to 260 ppm. However, the proxy record and the model simulation data show that the central Okhotsk Sea was near ice-free regardless of insolation forcing throughout the penultimate interglacial, and during the Holocene, when atmospheric CO2 was above similar to 260 ppm. Past sea ice conditions in the central Okhotsk Sea were therefore strongly modulated by both orbital-driven insolation and CO2-induced radiative forcing during the past glacial/interglacial cycle. (C) 2018 Elsevier B.V. All rights reserved.
机译：最近的高纬度海冰程减少了表明海冰对外部和内部辐射强度高度敏感。为了更好地了解海冰系统对外部轨道强制和内部振荡的轨道时间尺寸，在这里，我们在鄂霍茨克中央鄂霍克海的过去130,000年中重建了海冰范围和夏季海面温度（SST）的变化。我们应用了海冰（IP25），SSST（Tex（L）86）的新型有机地球化学术，并开放水海洋生产力（三种不饱和高度分支等异戊二烯和生物蛋白石）到海洋沉积物核心MD01-2414（53度11.77' N，149度34.80'，水深1123米）。为了补充代理数据，我们还开展了瞬态地球系统模型模拟和敏感性测试，以确定不同气候强制因素的贡献。我们的研究结果表明，鄂霍茨克中央海洋同位素阶段（MIS）5E和早期全新世，但在MIS 2-4期间经历了可变海冰覆盖，分别符合相对高，SSST的间隔，经历了可变的海冰覆盖。我们的数据还表明，海冰范围是通过190至260ppm的常压CO2浓度的间隔期间通过预先占主导地位的变化来治理。然而，代理记录和模型仿真数据表明，无论在整个倒数第二个中间爆发，在全新世时期，大气二氧化碳高于260ppm时，中央okhotsk海都在无冰上靠近冰。因此，在过去的冰川/中间峡循环期间，通过轨道驱动的缺失和二氧化碳辐射强制强烈调制中央Okhotsk海中的海冰条件。 （c）2018年elestvier b.v.保留所有权利。

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