关键词: 卫星热红外, 遥感, 热异常, 火山监测, 长白山天池

Abstract: The paper firstly introduces the research status of using thermal infrared remote sensing technology to monitor volcanic activity around the world,then reviews the principle of thermal infrared remote sensing technology.Meanwhile,the feasibility of monitoring volcanic activity using satellite thermal infrared remote sensing technology is analyzed.Moreover,we take the Changbaishan Tianchi volcano as an example.Firstly,land surface temperature distribution maps of Changbaishan Tianchi volcano are retrieved from Landsat TM/ETM images and ASTER images taken from 1999 to 2008.Then,to reduce the effect of different surface cover,we choose three types of the surface cover,i.e.vegetation(forest), mixture of soil and vegetation(short grasses),and bare rock.For each type of surface covers,the average daily temperature obtained from Tianchi Weather Station is deducted in order to reduce the effect of weather change.Finally,we obtain the annual surface temperature variation of the study area, which is believed to be caused by volcanic activity in the magma chamber.Our results indicate that the temperature of the study area increased with an intermittent tendency during 1999 to 2005,but dropped after 2005,and then maintained a stable tendency during 2006 to 2008.Such tendency of annual temperature variation caused by volcanic activity is consistent with the results from other different observation methods,e.g.seismic monitoring,ground deformation from GPS measurement,ratio of He isotope change from geochemistry monitoring.The results imply that it is of great potential to use the satellite thermal infrared remote sensing technology in monitoring volcanic activity.So the satellite thermal infrared remote sensing technology can be used as a routine means to monitor volcanic activity.

Key words: satellite thermal infrared, remote sensing, thermal anomaly, volcano monitoring, Chang-baishan Tianchi volcano