Organic Matter Mineralization and Trace Gas Turnover in Northeast Siberian Permafrost Deposits
Permafrost rocks are one of the potential of large storage carbon dioxide and methane, presumably the concentration of carbon in the range from 700 to 1500 Gt, which is considered by some authors to stimulate the processes of global warming. Perhaps quantity of this element is correct, but under wha...
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| Format: | Thesis |
| Language: | English |
| Published: |
2009
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| Online Access: | https://oceanrep.geomar.de/id/eprint/28435/ https://oceanrep.geomar.de/id/eprint/28435/1/2009_Sosnin-Aleksandr_MSc-Thesis_eng.pdf |
| Summary: | Permafrost rocks are one of the potential of large storage carbon dioxide and methane, presumably the concentration of carbon in the range from 700 to 1500 Gt, which is considered by some authors to stimulate the processes of global warming. Perhaps quantity of this element is correct, but under what conditions they are a threat? For better understanding this question firstly we need more details about mineralization, it helps us apply results of laboratory work in master thesis. Mineralization is a process of turning organic matter (plant and animal residues) in a simple inorganic (CO2, NH3, CaCO3, etc.). One of the most simple example of this process occurs in soil. Object of study is the allocation of carbon dioxide (and methane) from the permafrost layer of sediments of the Lena delta river. Thus, the aim of the work is assessment the possible emission of carbon dioxide in permafrost sediments of the Lena delta river (Samoylov and Kurungnakh islands). The work assumes the following tasks: 1. to improve our understanding on organic matter mineralization in the carbon rich northeast Siberian permafrost; 2. to determine the effect of geographical conditions on the rate of mineralization; 3. to measure the speed of mineralization of organic matter in anaerobic and aerobic conditions in permafrost sediments of the Delta Lena; 4. to measure total organic carbon concentrations in the samples; 5. to identify the dependence gas emission on the quantity of organic carbon concentration in the samples; Analysis of geographical conditions, climate and soil as the main factors influencing the persistence and modification of permafrost rocks is presented in the first chapter. Special attention is paid to the characteristics of permafrost soils and sediments in the Lena Delta River. The second chapter describes the materials and methods which were used for experiment. During laboratory research 1000 measurements of concentration trace gases in permafrost samples have been made. The results of the measurements and its ... |
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