Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant

Abstract Since the photolysis rate plays an important role in any photoreaction leading to compound sink and radical formation/destruction and eventually O3 formation, its impact on the simulated O3 concentration was evaluated in the present study. Both RADM2 and RACM were adopted with and without u...

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Autores principales:	Chien-Hung Chen, Tu-Fu Chen, Shang-Ping Huang, Ken-Hui Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7a489cbcf6ff4b97ac0351e1137a448e
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spelling	oai:doaj.org-article:7a489cbcf6ff4b97ac0351e1137a448e2021-12-02T15:54:06ZComparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant10.1038/s41598-021-84629-42045-2322https://doaj.org/article/7a489cbcf6ff4b97ac0351e1137a448e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84629-4https://doaj.org/toc/2045-2322Abstract Since the photolysis rate plays an important role in any photoreaction leading to compound sink and radical formation/destruction and eventually O3 formation, its impact on the simulated O3 concentration was evaluated in the present study. Both RADM2 and RACM were adopted with and without updated photolysis rate constants. The newly developed photolysis rates were determined based on two major absorption cross-section and quantum yield data sources. CMAQ in conjunction with meteorological MM5 and emission data retrieved from Taiwan and East Asia were employed to provide spatial and temporal O3 predictions over a one-week period in a three-level nested domain [from 81 km × 81 km in Domain 1 (East Asia) to 9 km × 9 km in Domain 3 (Taiwan)]. Four cases were analyzed, namely, RADM2, with the original photolysis rates applied in Case 1 as a reference case, RADM2, with the updated photolysis rates applied in Case 2, and RACM, with and without the updated photolysis rates applied in Cases 3 and 4, respectively. A comparison of the simulation and observed results indicates that both the application of updated photolysis rate constants and RACM instead of RADM2 enhanced all three error analysis indicators (unpaired peak prediction accuracy, mean normalized bias error and mean absolute normalized gross error). Specifically, RADM2 with the updated photolysis rates resulted in an increase of 12 ppb (10%) in the daily maximum O3 concentration in southwestern Taiwan, while RACM without the updated photolysis rates resulted in an increase of 20 ppb (17%) in the daily maximum O3 concentration in the same area. When RACM with the updated photolysis rate constants was applied in the air quality model, the difference in the daily maximum O3 concentration reached up to 30 ppb (25%). The implication of Case 4 (RACM with the updated photolysis rates) for the formation and degradation of α-pinene and d-limonene was examined.Chien-Hung ChenTu-Fu ChenShang-Ping HuangKen-Hui ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chien-Hung Chen Tu-Fu Chen Shang-Ping Huang Ken-Hui Chang Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
description	Abstract Since the photolysis rate plays an important role in any photoreaction leading to compound sink and radical formation/destruction and eventually O3 formation, its impact on the simulated O3 concentration was evaluated in the present study. Both RADM2 and RACM were adopted with and without updated photolysis rate constants. The newly developed photolysis rates were determined based on two major absorption cross-section and quantum yield data sources. CMAQ in conjunction with meteorological MM5 and emission data retrieved from Taiwan and East Asia were employed to provide spatial and temporal O3 predictions over a one-week period in a three-level nested domain [from 81 km × 81 km in Domain 1 (East Asia) to 9 km × 9 km in Domain 3 (Taiwan)]. Four cases were analyzed, namely, RADM2, with the original photolysis rates applied in Case 1 as a reference case, RADM2, with the updated photolysis rates applied in Case 2, and RACM, with and without the updated photolysis rates applied in Cases 3 and 4, respectively. A comparison of the simulation and observed results indicates that both the application of updated photolysis rate constants and RACM instead of RADM2 enhanced all three error analysis indicators (unpaired peak prediction accuracy, mean normalized bias error and mean absolute normalized gross error). Specifically, RADM2 with the updated photolysis rates resulted in an increase of 12 ppb (10%) in the daily maximum O3 concentration in southwestern Taiwan, while RACM without the updated photolysis rates resulted in an increase of 20 ppb (17%) in the daily maximum O3 concentration in the same area. When RACM with the updated photolysis rate constants was applied in the air quality model, the difference in the daily maximum O3 concentration reached up to 30 ppb (25%). The implication of Case 4 (RACM with the updated photolysis rates) for the formation and degradation of α-pinene and d-limonene was examined.
format	article
author	Chien-Hung Chen Tu-Fu Chen Shang-Ping Huang Ken-Hui Chang
author_facet	Chien-Hung Chen Tu-Fu Chen Shang-Ping Huang Ken-Hui Chang
author_sort	Chien-Hung Chen
title	Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
title_short	Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
title_full	Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
title_fullStr	Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
title_full_unstemmed	Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant
title_sort	comparison of the radm2 and racm chemical mechanisms in o3 simulations: effect of the photolysis rate constant
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7a489cbcf6ff4b97ac0351e1137a448e
work_keys_str_mv	AT chienhungchen comparisonoftheradm2andracmchemicalmechanismsino3simulationseffectofthephotolysisrateconstant AT tufuchen comparisonoftheradm2andracmchemicalmechanismsino3simulationseffectofthephotolysisrateconstant AT shangpinghuang comparisonoftheradm2andracmchemicalmechanismsino3simulationseffectofthephotolysisrateconstant AT kenhuichang comparisonoftheradm2andracmchemicalmechanismsino3simulationseffectofthephotolysisrateconstant
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Comparison of the RADM2 and RACM chemical mechanisms in O3 simulations: effect of the photolysis rate constant

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