Mid-ocean ridge eruptions as a climate valve
Mid-ocean ridge eruptions as a climate valve
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DOI：
10.1002/2014gl063015
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发表时间：
2015-03-16
影响因子：
5.2
通讯作者：
Tolstoy, Maya
中科院分区：
文献类型：
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作者：
Tolstoy, Maya
海底喷发率和地幔熔融燃料喷发可能会受到海平面和地壳负荷周期的影响，从每两周到100 kyr。最近的洋中脊爆发主要发生在小潮和一年的前6个月，这表明潮汐强迫和轨道偏心率的微小变化的敏感性。在快速扩展的海底测深中，类似于100 kyr的周期性以及在高海平面和轨道偏心率降低时相对较低的现今喷发率表明，对与米兰科维奇周期相关的海平面和轨道变化具有较长期的敏感性。海底扩张被认为是一个小的，但稳定的贡献者二氧化碳的气候循环在100 kyr的时间尺度;然而，这假设一个一致的短期喷发率。海底火山活动的脉动可能会反馈到气候循环中，可能有助于冰川/间冰期循环，冰河时代的突然结束以及100 kyr循环的主导地位。
Seafloor eruption rates and mantle melting fueling eruptions may be influenced by sea level and crustal loading cycles at scales from fortnightly to 100kyr. Recent mid-ocean ridge eruptions occur primarily during neap tides and the first 6months of the year, suggesting sensitivity to minor changes in tidal forcing and orbital eccentricity. An similar to 100kyr periodicity in fast-spreading seafloor bathymetry and relatively low present-day eruption rates at a time of high sea level and decreasing orbital eccentricity suggest a longer-term sensitivity to sea level and orbital variations associated with Milankovitch cycles. Seafloor spreading is considered a small but steady contributor of CO2 to climate cycles on the 100kyr time scale; however, this assumes a consistent short-term eruption rate. Pulsing of seafloor volcanic activity may feed back into climate cycles, possibly contributing to glacial/interglacial cycles, the abrupt end of ice ages, and dominance of the 100kyr cycle.