Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-15125-2018 |
Diurnal variation of aerosol optical depth and PM2.5 in South Korea: a synthesis from AERONET, satellite (GOCI), KORUS-AQ observation, and the WRF-Chem model | |
Lennartson, Elizabeth M.1; Wang, Jun1; Gu, Juping2; Garcia, Lorena Castro1; Ge, Cui1; Gao, Meng1,3; Choi, Myungje4; Saide, Pablo E.5; Carmichael, Gregory R.1; Kim, Jhoon4; Janz, Scott J.6 | |
2018-10-22 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:20页码:15125-15144 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China; South Korea |
英文摘要 | Spatial distribution of diurnal variations of aerosol properties in South Korea, both long term and short term, is studied by using 9 AERONET (AErosol RObotic NET-work) sites from 1999 to 2017 and an additional 10 sites during the KORUS-AQ (Korea-United States Air Quality) field campaign in May and June of 2016. The extent to which the WRF-Chem (Weather Research and Forecasting coupled with Chemistry) model and the GOCI (Geostationary Ocean Color Imager) satellite retrieval can describe these variations is also analyzed. On a daily average, aerosol optical depth (AOD) at 550 nm is 0.386 and shows a diurnal variation of 20 to - 30% in inland sites, which is larger than the AOD of 0.308 and diurnal variation of +/- 20% seen in coastal sites. For all the inland and coastal sites, AERONET, GOCI, and WRF-Chem, and observed PM2.5 (particulate matter with aerodynamic diameter less than 2.5 mu m) data generally show dual peaks for both AOD and PM2.5, one in the Angstrom exponent from morning to evening, reflecting an overall decrease in particle size in daytime. To statistically obtain the climatology of diurnal variation of AOD, a minimum requirement of similar to 2 years of observation is needed in coastal rural sites, twice as long as that required for the urban sites, which suggests that the diurnal variation of AOD in an urban setting is more distinct and persistent. While Korean GOCI satellite retrievals are able to consistently capture the diurnal variation of AOD (although it has a systematically low bias of 0.04 on average and up to 0.09 in later afternoon hours), WRF-Chem clearly has a deficiency in describing the relative change of peaks and variations between the morning and afternoon, suggesting further studies for the diurnal profile of emissions. Furthermore, the ratio between PM2.5 and AOD in WRF-Chem is persistently larger than the observed counterparts by 30 %-50 % in different sites, but spatially no consistent diurnal variation pattern of this ratio can be found. Overall, the relatively small diurnal variation of PM2.5 is in high contrast with large AOD diurnal variation, which suggests the large diurnal variation of AOD-PM2.5 relationships (with the PM2.5 / AOD ratio being largest in the early morning, decreasing around noon, and increasing in late afternoon) and, therefore, the need to use AOD from geostationary satellites to constrain either modeling or estimate of surface PM2.5 for air quality application. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447837100001 |
WOS关键词 | GROUND-LEVEL PM2.5 ; PARTICULATE MATTER ; NORTH CHINA ; AIR-QUALITY ; UNITED-STATES ; VALIDATION ; THICKNESS ; NETWORK ; IMPACT ; DUST |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19498 |
专题 | 地球科学 |
作者单位 | 1.Univ Iowa, Dept Chem & Biochem Engn, Ctr Global & Reg Environm Res, Iowa City, IA 52242 USA; 2.Nantong Univ, Dept Elect Engn, Nantong, Peoples R China; 3.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 4.Yonsei Univ, Dept Atmospher Sci, Seoul, South Korea; 5.Univ Calif Los Angeles, Inst Environm & Sustainabil, Dept Atmospher & Ocean Sci, Los Angeles, CA USA; 6.NASA, Lab Atmospher Chem & Dynam, Goddard Space Flight Ctr, Code 614, Greenbelt, MD USA |
推荐引用方式 GB/T 7714 | Lennartson, Elizabeth M.,Wang, Jun,Gu, Juping,et al. Diurnal variation of aerosol optical depth and PM2.5 in South Korea: a synthesis from AERONET, satellite (GOCI), KORUS-AQ observation, and the WRF-Chem model[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(20):15125-15144. |
APA | Lennartson, Elizabeth M..,Wang, Jun.,Gu, Juping.,Garcia, Lorena Castro.,Ge, Cui.,...&Janz, Scott J..(2018).Diurnal variation of aerosol optical depth and PM2.5 in South Korea: a synthesis from AERONET, satellite (GOCI), KORUS-AQ observation, and the WRF-Chem model.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(20),15125-15144. |
MLA | Lennartson, Elizabeth M.,et al."Diurnal variation of aerosol optical depth and PM2.5 in South Korea: a synthesis from AERONET, satellite (GOCI), KORUS-AQ observation, and the WRF-Chem model".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.20(2018):15125-15144. |
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