CAJ | 학술논문

在全球气候变暖影响下,冻土带中保存的天然气水合物被逐渐分解释放进入大气,改变了冻土带上空的大气甲烷( CH4)浓度。以地面甲烷遥感探测实验为基础,发现甲烷气体在380~2500 nm电磁波谱范围内存在2个明显的吸收谱段(1700 nm和2300 nm附近),从机理上解释了对大气甲烷的遥感检测能力,肯定了遥感探测天然气水合物的可行性。选择扫描成像吸收光谱大气制图仪( scanning imaging absorption spectrometer for atmospheric char鄄tography,SCIAMACHY)传感器反演的祁连山冻土带大气甲烷数据,分析了2003-2006年间冻土带大气甲烷的时空变化规律。结果表明：冻土带大气甲烷含量不仅随季节呈现单峰-单谷型的变化规律,而且总体上还随时间推移有明显的递增趋势,可初步认为是冻土带天然气水合物分解释放引起的。以2006年2月冻土带大气甲烷浓度异常图为依据,结合地理和地质资料,对祁连山冻土带天然气水合物的资源潜力进行了评价,认为木里煤田的江仓和热水矿区应该是潜在的天然气水合物赋存区。
재전구기후변난영향하,동토대중보존적천연기수합물피축점분해석방진입대기,개변료동토대상공적대기갑완( CH4)농도。이지면갑완요감탐측실험위기출,발현갑완기체재380~2500 nm전자파보범위내존재2개명현적흡수보단(1700 nm화2300 nm부근),종궤리상해석료대대기갑완적요감검측능력,긍정료요감탐측천연기수합물적가행성。선택소묘성상흡수광보대기제도의( scanning imaging absorption spectrometer for atmospheric char견tography,SCIAMACHY)전감기반연적기련산동토대대기갑완수거,분석료2003-2006년간동토대대기갑완적시공변화규률。결과표명：동토대대기갑완함량불부수계절정현단봉-단곡형적변화규률,이차총체상환수시간추이유명현적체증추세,가초보인위시동토대천연기수합물분해석방인기적。이2006년2월동토대대기갑완농도이상도위의거,결합지리화지질자료,대기련산동토대천연기수합물적자원잠력진행료평개,인위목리매전적강창화열수광구응해시잠재적천연기수합물부존구。
Gas hydrate in permafrost gradually decomposes and seeps to atmosphere because of global warming,and the seepage changes the methane ( CH4 ) concentration of permafrost's atmosphere. In this paper, the possibility of gas hydrate detection with remote sensing data is proved by the nature gas detection experiments performed with domestic nature gas and ASD portable spectrometer. The experimental results show that two feature absorptions, spectra around 1 700 nm and 2 300 nm, are founded in the electromagnetic wave range from 380 to 2500 nm. Supported by the experiment, the authors selected the remote sensing data retrieved from the scanning imaging absorption spectrometer for atmospheric chartography ( SCIAMACHY) sensor during the period from 2003 to 2006 to analyze temporal and spatial changes of atmospheric methane of the permafrost in the Qilian Mountain. In addition to the discovery of methane concentration's seasonal changes, the trend of its gradual increment characteristics was also detected. This phenomenon is considered to be the result of methane seepage from underground gas hydrate. Finally, in combination with the geological data, the atmospheric methane anomaly in February 2006 was used to evaluate the potential of gas hydrate of the permafrost in the Qilian Mountain and, as a result, a new prospecting area was recommended.