Speleothem records of changes in tropical hydrology over the Holocene and possible implications for atmospheric methane
Speleothem records of changes in tropical hydrology over the Holocene and possible implications for atmospheric methane
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DOI：
10.1177/0959683611400194
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发表时间：
2011-08-01
期刊：
影响因子：
2.4
通讯作者：
Burns, Stephen J.
中科院分区：
文献类型：
--
作者：
Burns, Stephen J.
最近的洞穴记录从热带的两个半球的文件逐渐减少的强度季风在北方半球和增加在南半球季风在全新世。这些变化是季风对岁差驱动的日射变率的直接响应。关于大气中的甲烷，这一变化应导致北方半球热带甲烷排放量减少，南半球排放量增加。由于热带边缘降雨的季节性减少，热带甲烷的总体产量在全新世中期经历了最低点，这是合理的。因此，仅热带甲烷产量的变化就可以解释全新世甲烷浓度和同位素化学的许多特征。
Recent speleothem records from the tropics of both hemispheres document a gradual decrease in the intensity of the monsoons in the Northern Hemisphere and increase in the Southern Hemisphere monsoons over the Holocene. These changes are a direct response of the monsoons to precession-driven insolation variability. With regard to atmospheric methane, this shift should result in a decrease in Northern Hemisphere tropical methane emissions and increase in Southern Hemisphere emissions. It is plausible that that overall tropical methane production experienced a minimum in the mid-Holocene because of decreased seasonality in rainfall at the margins of the tropics. Changes in tropical methane production alone might, therefore, explain many of the characteristics of Holocene methane concentrations and isotopic chemistry.