由冰川循环驱动的洋中脊CO2排放的变化
Variations in mid-ocean ridge CO2 emissions driven by glacial cycles
摘要：
地质记录显示，在地表下和洋中脊，冰川循环与火山生产力之间存在联系。海平面驱动的压力变化也可能影响洋中脊火山活动的化学性质。我们考虑如何改变海平面可能会改变二氧化碳排放率从洋中脊，在部分和全球范围内。我们开发了一个简化的传输模型，通过一个均匀的地幔高度不相容的元素，熔体浓度的变化，元素的排放率是由第一次硅酸盐熔融深度的变化。该模型预测全球平均洋中脊CO2排放率为53 Mt/年，与其他估计一致。我们表明，海平面下降将导致海脊CO2排放量的增加，滞后约100 kyrs后的原因海平面变化。响应的滞后和振幅对地幔渗透率和板块扩张速率敏感。对于重建的海平面时间序列的过去百万年，我们预测的变化高达12%（7吨/年）的全球洋中脊二氧化碳排放量。二氧化碳排放量的预测变化的幅度和时间表明，在冰川周期中的山脊碳排放的潜在作用。
英文摘要：
The geological record shows links between glacial cycles and volcanic productivity, both subaerially and at mid-ocean ridges. Sea-level-driven pressure changes could also affect chemical properties of mid-ocean ridge volcanism. We consider how changing sea-level could alter the CO2 emissions rate from mid-ocean ridges, on both the segment and global scale. We develop a simplified transport model for a highly incompatible element through a homogenous mantle; variations in the melt concentration the emission rate of the element are created by changes in the depth of first silicate melting. The model predicts an average global mid-ocean ridge CO2 emissions-rate of 53 Mt/yr, in line with other estimates. We show that falling sea level would cause an increase in ridge CO2 emissions with a lag of about 100 kyrs after the causative sea level change. The lag and amplitude of the response are sensitive to mantle permeability and plate spreading rate. For a reconstructed sea-level time series of the past million years, we predict variations of up to 12% (7 Mt/yr) in global mid-ocean ridge CO2 emissions. The magnitude and timing of the predicted variations in CO2 emissions suggests a potential role for ridge carbon emissions in glacial cycles.
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