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Diurnal Variation of Aerosol Optical...

Lennartson, Elizabeth Marie.

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Diurnal Variation of Aerosol Optical Depth and PM2.5 in South Korea: A Synthesis from AERONET, Satellite (GOCI), KORUS-AQ Observation, and WRF-Chem Model.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Diurnal Variation of Aerosol Optical Depth and PM2.5 in South Korea: A Synthesis from AERONET, Satellite (GOCI), KORUS-AQ Observation, and WRF-Chem Model./
作者:	Lennartson, Elizabeth Marie.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	55 p.
附註:	Source: Masters Abstracts International, Volume: 80-01.
Contained By:	Masters Abstracts International80-01.
標題:	Atmospheric Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10752197
ISBN:	9780438153004

Diurnal Variation of Aerosol Optical Depth and PM2.5 in South Korea: A Synthesis from AERONET, Satellite (GOCI), KORUS-AQ Observation, and WRF-Chem Model.
Lennartson, Elizabeth Marie.

Diurnal Variation of Aerosol Optical Depth and PM2.5 in South Korea: A Synthesis from AERONET, Satellite (GOCI), KORUS-AQ Observation, and WRF-Chem Model. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 55 p.

Source: Masters Abstracts International, Volume: 80-01.

Thesis (M.S.)--The University of Iowa, 2018.

This item is not available from ProQuest Dissertations & Theses.

Spatial distribution of diurnal variations of aerosol properties in South Korea, both long term and short term, is studied by using 9 AERONET sites from 1999 to 2017 for long-term averages and from an additional 10 sites during the KORUS-AQ field campaign. The extent to which WRF-Chem model and the GOCI satellite retrieval can describe these variations is also analyzed. In daily average, Aerosol Optical Depth (AOD) at 550 nm is 0.386 and shows a diurnal variation of +20 to -30% in inland sites, respectively larger than the counterparts of 0.308 and ± 20% in coastal sites. Both the inland and coastal sites have their diurnal variation peaks in the early morning and in the evening with noontime and early afternoon valleys. In contrast, Angstrom exponent values in all sites are between 1.2 and 1.4 with the exception of the inland rural sites having smaller values near 1.0 during the early morning hours. All inland sites experience a pronounced increase of Angstrom Exponent from morning to evening, reflecting overall decrease of particle size in daytime. To statistically obtain the climatology of diurnal variation of AOD, a minimum of requirement of ~2 years of observation is needed in coastal rural sites, twice more than the urban sites, which suggests that diurnal variation of AOD in urban setting is distinct and persistent. AERONET, GOCI, WRF-Chem, and observed PM2.5 data consistently show dual peaks for both AOD and PM2.5, one at ~ 10 KST and another ~14 KST. While Korean GOCI satellite is able to consistently capture the diurnal variation of AOD, WRF-Chem clearly has the deficiency to describe the relatively change of peaks and variations between the morning and afternoon, suggesting further studies for the diurnal profile of emissions. Overall, the relative small diurnal variation of PM2.5 is in high contrast with large AOD diurnal variation, which suggests the need to use AOD from geostationary satellites for constrain either modeling or analysis of surface PM2.5 for air quality application.

ISBN: 9780438153004Subjects--Topical Terms:

1669583
Atmospheric Chemistry.

Diurnal Variation of Aerosol Optical Depth and PM2.5 in South Korea: A Synthesis from AERONET, Satellite (GOCI), KORUS-AQ Observation, and WRF-Chem Model.
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506 $a This item is not available from ProQuest Dissertations & Theses.
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520 $a Spatial distribution of diurnal variations of aerosol properties in South Korea, both long term and short term, is studied by using 9 AERONET sites from 1999 to 2017 for long-term averages and from an additional 10 sites during the KORUS-AQ field campaign. The extent to which WRF-Chem model and the GOCI satellite retrieval can describe these variations is also analyzed. In daily average, Aerosol Optical Depth (AOD) at 550 nm is 0.386 and shows a diurnal variation of +20 to -30% in inland sites, respectively larger than the counterparts of 0.308 and ± 20% in coastal sites. Both the inland and coastal sites have their diurnal variation peaks in the early morning and in the evening with noontime and early afternoon valleys. In contrast, Angstrom exponent values in all sites are between 1.2 and 1.4 with the exception of the inland rural sites having smaller values near 1.0 during the early morning hours. All inland sites experience a pronounced increase of Angstrom Exponent from morning to evening, reflecting overall decrease of particle size in daytime. To statistically obtain the climatology of diurnal variation of AOD, a minimum of requirement of ~2 years of observation is needed in coastal rural sites, twice more than the urban sites, which suggests that diurnal variation of AOD in urban setting is distinct and persistent. AERONET, GOCI, WRF-Chem, and observed PM2.5 data consistently show dual peaks for both AOD and PM2.5, one at ~ 10 KST and another ~14 KST. While Korean GOCI satellite is able to consistently capture the diurnal variation of AOD, WRF-Chem clearly has the deficiency to describe the relatively change of peaks and variations between the morning and afternoon, suggesting further studies for the diurnal profile of emissions. Overall, the relative small diurnal variation of PM2.5 is in high contrast with large AOD diurnal variation, which suggests the need to use AOD from geostationary satellites for constrain either modeling or analysis of surface PM2.5 for air quality application.
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