Inclusion of the weathering of volcanic rocks in the GEOCARBSULF model
Inclusion of the weathering of volcanic rocks in the GEOCARBSULF model
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DOI：
10.2475/05.2006.01
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发表时间：
2006-05-01
影响因子：
2.9
通讯作者：
Berner, Robert A.
中科院分区：
文献类型：
--
作者：
Berner, Robert A.
通过将硅酸盐的风化作用分为火山岩和非火山岩，扩展了碳循环模型GEOCARBSULF。火山风化作用的比例是根据锶-87/锶-86的海洋记录计算的时间函数。然后，通过添加一个新的无量纲火山风化因子，火山比例被用来修改计算大气二氧化碳的公式。只利用砂岩和页岩丰度随时间的分布修正了抬升和物理侵蚀对风化的影响，而不使用以前使用的锶同位素数据。结果表明，在显生界时间内，大气CO2的分布与GEOCARBSULF有中等程度的变化。这包括晚奥陶世二氧化碳最低值的增加，与当时大陆冰川的存在相一致，以及中生代最大值从侏罗纪向早白垩世的转移。
The carbon cycle model GEOCARBSULF is extended by dividing the weathering of silicates into volcanic and non-volcanic rocks. The proportion of volcanic weathering is calculated as a function of time from the oceanic record of Sr-87/Sr-86. The volcanic proportion is then used to modify the equations for calculating atmospheric CO2 by the addition of a new non-dimensional volcanic weathering factor. The effect of uplift and physical erosion on weathering is also modified by using only the distribution over time of the abundance of sandstones and shales, and not Sr isotopic data that had been used previously. Results indicate moderate change from GEOCARBSULF in the distribution of atmospheric CO2 over Phanerozoic time. This includes an increased minimum in CO2 during the Late Ordovician, in agreement with the presence of a continental glaciation at that time, and a shift of maximum Mesozoic values from the Jurassic to the Early Cretaceous.