Holocene variations in peatland methane cycling associated with the Asian summer monsoon system.
Holocene variations in peatland methane cycling associated with the Asian summer monsoon system.
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DOI：
10.1038/ncomms5631
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发表时间：
2014-08-19
影响因子：
16.6
通讯作者：
Pancost, Richard D.
中科院分区：
文献类型：
--
作者：
Zheng, Yanhong;Singarayer, Joy S.;Cheng, Peng;Yu, Xuefeng;Liu, Zhao;Valdes, Paul J.;Pancost, Richard D.
大气甲烷浓度下降，在早至中全新世，然而，管理机制仍然存在争议。虽然有人认为，中全新世最低甲烷排放量与水文变化有关，但缺乏直接证据。在这里，我们报告了一个新的独立的方法，从青藏高原泥炭沉积物中的水文变化，古菌二醚浓度和diploptene δ 13 C值的变化作为甲烷生成和甲烷营养的示踪剂，分别。推断甲烷发生在全新世中期，这在当地，对应于全新世最干燥的条件下，反映了亚洲季风降水的最低限度。降水和甲烷生成之间的密切耦合被气候模拟所验证，这也表明了区域性的广泛影响。重要的是，甲烷生成的最小值与甲烷营养的最大值相关。因此，青藏高原地区的甲烷排放量在中全新世明显较低，并在一定程度上受到大尺度大气环流的相互作用。 虽然人们普遍认为中全新世最低甲烷排放量与水文变化有关，但缺乏直接证据。在这里，作者提出了来自青藏高原的证据，使用甲烷生成和甲烷营养的示踪剂，结合气候模拟。
Atmospheric methane concentrations decreased during the early to middle Holocene; however, the governing mechanisms remain controversial. Although it has been suggested that the mid-Holocene minimum methane emissions are associated with hydrological change, direct evidence is lacking. Here we report a new independent approach, linking hydrological change in peat sediments from the Tibetan Plateau to changes in archaeal diether concentrations and diploptene δ13C values as tracers for methanogenesis and methanotrophy, respectively. A minimum in inferred methanogenesis occurred during the mid-Holocene, which, locally, corresponds with the driest conditions of the Holocene, reflecting a minimum in Asian monsoon precipitation. The close coupling between precipitation and methanogenesis is validated by climate simulations, which also suggest a regionally widespread impact. Importantly, the minimum in methanogenesis is associated with a maximum in methanotrophy. Therefore, methane emissions in the Tibetan Plateau region were apparently lower during the mid-Holocene and partially controlled by interactions of large-scale atmospheric circulation. Although it has been widely suggested that the mid-Holocene minimum methane emissions are associated with hydrological change, direct evidence is missing. Here, the authors present evidence from the Tibetan Plateau using tracers of methanogenesis and methanotrophy, in combination with climate simulations.
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影响因子：
56.9
作者：
Fleitmann, D;Burns, SJ;Matter, A
通讯作者：
Matter, A
影响因子：
56.9
作者：
Bloom, A. Anthony;Palmer, Paul I.;Frankenberg, Christian
通讯作者：
Frankenberg, Christian
影响因子：
--
作者：
Jin, HJ;Wu, J;Sun, GY
通讯作者：
Sun, GY
影响因子：
5
作者：
Daulat, WE;Clymo, RS
通讯作者：
Clymo, RS
影响因子：
2.4
作者：
Burns, Stephen J.
通讯作者：
Burns, Stephen J.