http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hansu Park,Na-Yeon Ko,JeongEun Kim,Thomas Opel,Sebastian Wetterich,Alexander Fedorov,Anderei Shepelev,Jinho Ahn 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The Batagay megaslump (Yana Uplands, Northeast Siberia) exposes Pleistocene and Holocene permafrost layers with two massive ice complexes. Previous studies suggest that the ages of these ice layers as MIS4-2 and MIS16 for the Upper and Lower Ice Complexes, respectively. In this study, we present gas concentrations in air bubbles occluded in the ice complexes. We extracted gas by both wet and dry extraction methods and using gas chromatography system to analyze dry molar mixing ratios. CO₂, N₂O, and CH₄ concentrations cover large ranges. We observe CO₂ concentrations of 1.9-10.3%, N₂O of 0.1-8 ppm, and CH₄ of 30-170 ppm for the Lower Ice Complex, while CO₂ of 0.03-8.89%, N₂O of 0.3-70 ppm, and CH₄ of 5-980 ppm for the Upper Ice Complex. The N₂O concentration in the Upper Ice Complex is extraordinarily high compared with other permafrost regions. Also, the CH₄ and N₂O show a weak negative correlation in both ice complexes. The δ(N₂/Ar) values range from -8.06% to 33.86% for the Lower Ice Complex and -5.49% to 30.64% for the Upper Ice Complex. These values indicate that there is little melting during and after the ice complex formation, which is also supported by investigation of the bubble shapes. On the other hand, the δ(O₂/Ar) values range -89.01 to –67.43% and -98.07 to -47.06% for the Lower and Upper Ice Complexes, respectively. The highly depleted δ(O₂/Ar) values may indicate strong oxidation reactions by microbial activities and/or abiological oxidation reactions. Our future research with isotope analyses such as δ<SUP>15</SUP>N of N₂O and δ<SUP>13</SUP>C, <SUP>14</SUP>C of CO₂ may help us better constrain formation processes of the ice wedges and origin of the greenhouse gases. These studies will serve as a basis for studying the impact of global warming on permafrost.