• Title/Summary/Keyword: 에어로솔

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Characteristics of $PM_{2.5}/PM_{10}$ components at Gosan in Jeju-do ; March in 2002 (제주도 고산에서의 $PM_{2.5}/PM_{10}$ 성분 특성 분석)

  • 공부주;한진석;문광주;안준영;정다위;이석조;김정은;김영준
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2002.11a
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    • pp.147-148
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    • 2002

  • 대기중의 유해 에어로솔의 장거리 이동에 대한 과학적인 자료를 마련하기 위해 2002년 3월 29일부터 4월 11일까지 제주도 서쪽 끝에 위치한 고산사이트에서 PM$_{2.5}$와 PM$_{10}$ 에어로솔의 샘플링을 수행하였다. 이로부터 제주도 고산지역 대기 중 PM$_{2.5}$/PM$_{10}$의 물리적, 화학적 특성을 파악하고, 유기물 측정 결과를 통한 오염물질의 배출원 추정 및 장거리 이동가능성을 검토하고자 하였다. (중략)(중략)(중략)

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Investigation of O4 Air Mass Factor Sensitivity to Aerosol Peak Height Using UV-VIS Hyperspectral Synthetic Radiance in Various Measurement Conditions (UV-VIS 초분광 위성센서 모의복사휘도를 활용한 다양한 관측환경에서의 에어로솔 유효고도에 대한 O4 대기질량인자 민감도 조사)

  • Choi, Wonei;Lee, Hanlim;Choi, Chuluong;Lee, Yangwon;Noh, Youngmin
    • Korean Journal of Remote Sensing
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    • v.36 no.2_1
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    • pp.155-165
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    • 2020

  • In this present study, the sensitivity of O4 Air Mass Factor (AMF) to Aerosol Peak Height (APH) has been investigated using radiative transfer model according to various parameters(wavelength (340 nm and 477 nm), aerosol type (smoke, dust, sulfate), aerosol optical depth (AOD), surface reflectance, solar zenith angle, and viewing zenith angle). In general, it was found that O4 AMF at 477 nm is more sensitive to APH than that at 340 nm and is stably retrieved with low spectral fitting error in Differential Optical Absorption Spectroscopy (DOAS) analysis. In high AOD condition, sensitivity of O4 AMF on APH tends to increase. O4 AMF at 340 nm decreased with increasing solar zenith angle. This dependency isthought to be induced by the decrease in length of the light path where O4 absorption occurs due to the shielding effect caused by Rayleigh and Mie scattering at high solar zenith angles above 40°. At 477 nm, as the solar zenith angle increased, multiple scattering caused by Rayleigh and Mie scattering partly leads to the increase of O4 AMF in nonlinear function. Based on synthetic radiance, APHs have been retrieved using O4 AMF. Additionally, the effect of AOD uncertainty on APH retrieval error has been investigated. Among three aerosol types, APH retrieval for sulfate type is found to have the largest APH retrieval error due to uncertainty of AOD. In the case of dust aerosol, it was found that the influence of AOD uncertainty is negligible. It indicates that aerosol types affect APH retrieval error since absorption scattering characteristics of each aerosol type are various.

  • https://doi.org/10.7780/kjrs.2020.36.2.1.5 인용 PDF KSCI HTML

Validation of MODIS-derived Aerosol Optical Thickness Using SKYNET Measurements over East Asia (SKYNET 관측 자료를 이용한 동아시아 영역에서의 MODIS 에어로솔 광학 두께 산출물 검증)

  • Jang, Hyun-Sung;Song, Hwan-Jin;Chun, Hyoung-Wook;Sohn, Byung-Ju;Takamura, Tamio
    • Journal of the Korean earth science society
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    • v.32 no.1
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    • pp.21-32
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    • 2011

  • Using six-year (2004-2009) SKYNET measurements, MODIS-derived AOTs were validated at five SKYNET sites (Seoul, Chiba, Etchujima, Fukuejima, and Hedomisaki), in addition to climatological analysis of MODIS-derived optical properties over the East Asian domain ($20-50^{\circ}N$, $90-150^{\circ}E$). In so doing MODIS-SKYNET collocated AOT data were constructed if two measurements are taken within 25 km distance and within 30 minute time difference. From the comparison of two measurements, it is demonstrated that aerosol type insignificantly affects the accuracy of MODIS AOT. It is because the aerosol model combining predefined fine aerosol model and coarse aerosol model is used for the retrieval. However, positive bias between MODIS and SKYNET increases as fraction of the coarse aerosol model increases. In addition, MODIS AOT appears to be overestimated in case of lower aerosol loading while the overestimation tends to decrease with increased aerosol loading. Regression analysis between MODIS AOT and SKYNET AOT for 550 nm band yields 0.86, 0.16, and 0.61 of regression slope, intercept, and coefficient of determination, respectively. Those statistical results may draw a conclusion that MODIS AOTs over East Asia carry a reasonable accuracy compared to ground-based SKYNET measurements.

  • https://doi.org/10.5467/JKESS.2011.32.1.21 인용 PDF KSCI