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2011년 서울상공 중층대기 오존의 고도별 분포도 관측 연구
가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.4
Ozone in the stratosphere receives attention as one of the major greenhouse gases. Monitoring stratospheric ozone has been performed by using microwave radiometer. Ozone emits 110.836 GHz radiation spontaneously by 606-615 rotational transition, and it can be detected by a radiometer on the ground. The stratospheric ozone spectrum has been monitored by the microwave radiometer (SORAS) in Seoul. The vertical profiles of ozone from January to June 2011 have been retrieved and the retrieved SORAS profiles are validated by comparing convolved AURA MLS ozone profiles. The retrieved profiles are agreed to AURA MLS data in spring when troposphere is dry. In summer, the profile shows some deviation from AURA MLS data in the high altitude level. It means that the high opacity from the tropospheric water vapor induces the result deviation.
가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.1
The radiation emitted from atmospheric gas molecules such as oxygen, ozone, and water vapor can be detected as a line spectrum at characteristic frequencies. The detected spectrum ozone at the ground shows broad shape as it is perturbed by collisions with other molecules. In addition, the spectrum shape is affected by temperature, pressure and gas concentration. In this paper, we studied the temperature effect on the spectrum shape of ozone detected at the ground by modifying temperature profile values. The forward calculation is performed by the atmospheric radiative transfer simulator program with the fast atmospheric signature code atmospheric database.
마이크로파 스펙트럼 관측을 통한 2013년 성층권 오존 연직분포
가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2014 환경분석과 독성보건 Vol.17 No.4
The ozone layer determines the thermal vertical structure of the stratosphere by absorbing solar UV radiation. Ozone also has impacts on the global radiative budget. A microwave radiometer is a useful instrument to monitor the vertical profile of gases in the middle atmosphere. The 110.836 GHz radiation emitted from the atmospheric ozone molecules can be detected at the ground by the microwave radiometer. The ozone spectrum observed from the ground includes tropospheric effects, especially by variations in water vapor concentration. These tropospheric effects need to be considered for analysis. In this paper, the water vapor contribution to the spectrum was estimated by comparing two items, bias temperature and intensity, with MPM93 simulated values. From the method, the ozone profile was retrieved from May through December 2013. The maximum ozone concentration of the ozone layer was calculated as 8 ppmv with some seasonal variations. The retrieved profile was validated by comparing with AURA MLS satellite data, and the deviation was found to be about 10%.
가수현 ( Soo Hyun Ka ),이정은 ( Jung Eun Lee ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.1
Due to the climate change in this century around the globe, various problems like global warming, and abrupt change in climate variables have occurred. Especially, extreme weather and climate events above or below a threshold value near the upper or lower ends of the range of observed values of variable have increased rapidly. These extreme climate events have caused problems such as temperature rise, precipitation, glacial retreats and elevation of sea level rise and have brought a great economic losses and indirect effects on ecosystem services. Intergovernmental solution to the disasters due to the climate extremes has been pursued for adaptation and risk management. The review and evaluation on the current status of our scientific research and suggestions are discussed for the future development of climate observation science.
중층대기 수증기 관측을 통한 광학두께와 대류권 수증기 연관성 연구
가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.4
Water vapor takes up the largest proportion of the greenhouse gases which accelerate climate change. Monitoring water vapor is important to predict future climate conditions and estimate its effect on the atmospheric chemical and physical reaction. The microwave radiometer is able to detect the amount of atmospheric water vapor by receiving its radiation. In addition, atmospheric opacity can be calculated from the calibration. This paper will show the water vapor profile and atmospheric opacity, optical thickness, variation measured by the 22 GHz ground-based microwave radiometer for two years. The measured opacity indicates the possibility that the total amount of tropospheric water vapor can be derived.
대기 광학두께와 110 GHz 대기 전파 스펙트럼의 상관관계 연구
가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.4
The middle atmosphere contains ozone and water vapor which may signal the global climate change. To measure the variation of middle atmospheric composition, a ground based monitoring instrument has been developed. The ground-based microwave radiometer has been used to monitor the middle atmospheric constituents. The atmospheric radiation arriving to the ground passes through the troposphere and includes tropospheric influence. In this paper, the tropospheric water vapor effects on the 110 GHz ozone spectrum have been analyzed by the ground-based radiometer, SORAS (Stratospheric Ozone Radiometer in Seoul). The opacity measured by 22 GHz ground-based radiometer, SWARA (Seoul Water Vapour Radiometer) was compared with the results from SORAS.
n-butylsilane의 마이크로파 스펙트럼 분석 및 ab initio 계산을 통한 Conformer 분석
김지현 ( Ji Hyun Kim ),가수현 ( Soo Hyun Ka ),오정진 ( Jung Jin Oh ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.4
Using microwave spectroscopy, many gas molecules have been determined dipole moments, spectroscopic constants, and structure parameters. Through this study, we find out characteristics of gas molecules and these data can be good information about the atmospheric chemical reaction. The spectrum of n-butylsilane, expected to exist in the atmosphere, was analyzed. n-butylsilane has five conformers aa, ag, ga, gg, gg`. All conformers are prolate asymmetric rotors; the kappa value is between -0.96 and -0.99. To assign rotational spectra, the tentative rotational constants were calculated using Gaussian 03. For aa conformer strong a-type transition with J from 3 to 7 were found and assigned. For ag conformer, a-type transitions and some of c-type transitions were found. For ga conformer, a-type transition and some of b-type transitions constants were found. However, the spectra of the gg, gg` conformer were not found. The three rotational, centrifugal distortion constants were determined and the fit was done using Watson`s S reduced Hamiltonian.