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首页> 外文期刊>Geophysical Research Letters >A model for late quaternary methane ice core signals: Wetlands versus a shallow marine source
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A model for late quaternary methane ice core signals: Wetlands versus a shallow marine source

机译:晚第四纪甲烷冰芯信号的模型:湿地与浅海源

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摘要

A three-reservoir model with first order kinetics for methane records in the Vostok (Antarctica) and GISP2 (Greenland) ice cores reproduces the sawtooth pattern and the maximum and minimum concentrations. The model also returns an atmospheric methane relaxation time of similar to 10 years for both cores, which is the same as current estimates. The characteristics of the source reservoirs are long relaxation times (33.3 and 100 ky) and high initial methane concentrations (2500 and 7000 ppm) for GISP2 and Vostok, respectively. These characteristics are consistent with gas hydrate sources in shallow marine sediments, but not with wetland sources which have insufficient storage capacity and low source strength.
机译:一个三储层模型,具有在沃斯托克(南极洲)和GISP2(格陵兰岛)冰芯中甲烷记录的一阶动力学,可再现锯齿形以及最大和最小浓度。该模型还为两个岩心返回了大约10年的大气甲烷弛豫时间,与当前估计值相同。对于GISP2和Vostok,源储层的特征分别是较长的弛豫时间(33.3和100 ky)和较高的初始甲烷浓度(2500和7000 ppm)。这些特征与浅海沉积物中的天然气水合物源一致,但与储存容量不足和源强度低的湿地源不一致。

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