121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-127
Subject Microwave spectrum and the vertical profiles of atmospheric species measured by ground-based remote sensing instruments
Authors Soohyun Ka, Jung Jin Oh1,*
Research Institute of Global Environment, Sookmyung Women's University, Korea
1Department of Chemistry, Sookmyung Women's University, Korea
Abstract The gas molecules with permanent dipole moments emit the microwave radiation due to the rotational transition. The microwave can be detected by a radiometer with remote sensing technique, it provides us with information about a vertical distribution and a wind speed or direction. The shape of microwave spectra is determined by the pressure broadening and Doppler broadening effect. In case of the ground-based measurement, the contribution of pressure broadening is quite bigger than of Doppler broadening as there are lots of gas molecules and the pressure broadening give us information about the vertical profile. The microwave radiometer is a unique ground-based instrument which is possible to monitor the atmosphere change above 40 km altitude. In this presentation, we will show you the vertical distribution of ozone and water vapor above Seoul, Korea which are measured by 110 GHz and 22 GHz radiometer, respectively. The measured spectra by the radiometers have been calibrated from the reference loads called Hot and Cold. The microwave absorbers at the ambient temperature and soaked in the liquid nitrogen are used for the reference loads. The brightness temperature of the atmospheric signal has been calibrated by linear equation with signal and physical temperature of two reference loads. The vertical profiles have been retrieved from the integrated measured spectrum by the statistical method. The temporal and seasonal variation of the ozone and water vapor in the middle atmosphere is presented here and validated with the satellite data. “This work is financially supported by Korea Ministry of Environment(MOE) as 「Graduate School specialized in Climate Change」.”
E-mail shyun@sookmyung.ac.kr