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Book ; Online: Air Pollution Modelling: Local-, Regional-, and Global-Scale Application

Itahashi, Syuichi

2021

Keywords	Environmental science, engineering & technology ; Urban pollution ; Street canyon ; Nitrate aerosol ; CFD ; Air quality ; open burning ; biomass burning ; sugarcane crops ; environmental assessment ; air quality modeling ; chemical reaction model ; urban canyon ; radiation ; mesoscale models ; reactive pollutants ; Community Multiscale Air Quality (CMAQ) ; East Asia ; Tokyo ; SO42 ; stabilized Criegee intermediates (SCI) ; wildfire plume rise ; smoke modeling ; large eddy simulation ; emissions dispersion ; WRF-SFIRE ; RxCADRE ; RePLaT-Chaos ; large-scale atmospheric advection ; chaotic advection ; stretching rate ; escape rate ; education ; CMAQ ; PM10 ; atmospheric reanalysis ; PM2.5 ; PM2.5 components ; three-dimensional chemical transport model ; model inter-comparison ; urban scale ; secondary particles ; WRF-Chem ; visibility ; eastern China ; neural network algorithm ; IMPROVE ; n/a
Size	1 electronic resource (174 pages)
Publisher	MDPI - Multidisciplinary Digital Publishing Institute
Publishing place	Basel, Switzerland
Document type	Book ; Online
Note	English ; Open Access
HBZ-ID	HT021291677
ISBN	9783036506456 ; 3036506454
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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Article ; Online: Severe level of photochemical oxidants (O

Itahashi, Syuichi

Scientific reports

2023 Volume 13, Issue 1, Page(s) 16369

Abstract: Photochemical oxidants ( ... ...

Abstract	Photochemical oxidants (O
Language	English
Publishing date	2023-09-29
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-43485-0
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Surface and aloft NO2 pollution over the greater Tokyo area observed by ground-based and MAX-DOAS measurements bridged by kilometer-scale regional air quality modeling

Syuichi Itahashi / Hitoshi Irie

Progress in Earth and Planetary Science, Vol 9, Iss 1, Pp 1-

2022 Volume 19

Abstract: Abstract To advance our understanding of surface and aloft nitrogen dioxide (NO2) pollution, this study extensively evaluated NO2 concentrations simulated by the regional air quality modeling system with a 1.3 km horizontal grid resolution using the ... ...

Abstract	Abstract To advance our understanding of surface and aloft nitrogen dioxide (NO2) pollution, this study extensively evaluated NO2 concentrations simulated by the regional air quality modeling system with a 1.3 km horizontal grid resolution using the Atmospheric Environmental Regional Observation System ground-based observation network and aloft measurements by multi-axis differential optical absorption spectroscopy (MAX-DOAS) over the greater Tokyo area. Observations are usually limited to the surface level, and gaps remain in our understanding of the behavior of air pollutants above the near-surface layer, particularly within the planetary boundary layer (PBL). Therefore, MAX-DOAS measurement was used, which observes scattered sunlight in the ultraviolet/visible range at several elevation angles between the horizon and zenith to determine the aloft NO2 pollution averaged over 0–1 km. In total, four MAX-DOAS measurement systems at Chiba University (35.63°N, 140.10°E) systematically covered the north, east, west, and south directions to capture the aloft NO2 pollution over the greater Tokyo area. The target period was Chiba-Campaign 2015 conducted during 9–23 November 2015. The evaluations showed that the air quality modeling system can generally capture the observed behavior of both surface and aloft NO2 pollution in terms of spatial and temporal coverage. The diurnal variation, which typically showed an increase from evening to early morning without daylight and a decrease during the daytime, was also captured by the model. During Chiba-Campaign 2015, two cases of episodic higher NO2 concentration were identified: one during the nighttime and another during the daytime as different diurnal patterns. These were related to a stagnant wind field, with the latter also connected to a lower PBL height in cloudy conditions. Comparison of the modeled daily-averaged surface and aloft NO2 concentrations showed that aloft NO2 concentration exhibited a strong linear correlation with surface NO2 concentration, with the ...
Keywords	Nitrogen dioxide ; AEROS ; MAX-DOAS ; Air quality model ; High-resolution modeling ; Planetary boundary layer ; Geography. Anthropology. Recreation ; G ; Geology ; QE1-996.5
Subject code	910
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	SpringerOpen
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effectiveness of emission controls implemented since 2000 on ambient ozone concentrations in multiple timescales in Japan: An emission inventory development and simulation study.

Chatani, Satoru / Kitayama, Kyo / Itahashi, Syuichi / Irie, Hitoshi / Shimadera, Hikari

The Science of the total environment

2023 Volume 894, Page(s) 165058

Abstract: It has been reported that ambient ozone concentrations in Japan have not been effectively suppressed by precursor emission controls. In this study, we developed an unprecedented long-term emission inventory of ozone precursors, including nitrogen oxide ( ... ...

Abstract	It has been reported that ambient ozone concentrations in Japan have not been effectively suppressed by precursor emission controls. In this study, we developed an unprecedented long-term emission inventory of ozone precursors, including nitrogen oxide (NO
Language	English
Publishing date	2023-06-21
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.165058
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Article ; Online: Returning long-range PM

Itahashi, Syuichi / Yamamura, Yuki / Wang, Zhe / Uno, Itsushi

Scientific reports

2022 Volume 12, Issue 1, Page(s) 5539

Abstract: Changes in the aerosol composition of sulfate ( ... ...

Abstract	Changes in the aerosol composition of sulfate (SO
MeSH term(s)	Air Pollutants/analysis ; COVID-19/epidemiology ; China/epidemiology ; Communicable Disease Control ; Environmental Monitoring ; Far East/epidemiology ; Humans ; Pandemics ; Particulate Matter/analysis
Chemical Substances	Air Pollutants ; Particulate Matter
Language	English
Publishing date	2022-04-01
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-09388-2
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Fifteen-Year Trends (2005–2019) in the Satellite-Derived Ozone-Sensitive Regime in East Asia: A Gradual Shift from VOC-Sensitive to NOx-Sensitive

Itahashi, Syuichi / Irie, Hitoshi / Shimadera, Hikari / Chatani, Satoru

Remote Sensing. 2022 Sept. 09, v. 14, no. 18

2022

Abstract: To mitigate tropospheric ozone (O₃) pollution with proper and effective emission regulations, diagnostics for the O₃-sensitive regime are critical. In this study, we analyzed the satellite-measured formaldehyde (HCHO) and nitrogen dioxide (NO₂) column ... ...

Abstract	To mitigate tropospheric ozone (O₃) pollution with proper and effective emission regulations, diagnostics for the O₃-sensitive regime are critical. In this study, we analyzed the satellite-measured formaldehyde (HCHO) and nitrogen dioxide (NO₂) column densities and derived the HCHO to NO₂ ratio (FNR) from 2005 to 2019. Over China, there was a clear increase in the NO₂ column during the first 5-year period and a subsequent decrease after 2010. Over the Republic of Korea and Japan, there was a continuous decline in the NO₂ column over 15 years. Over the entire East Asia, a substantial increase in the HCHO column was identified during 2015–2019. Therefore, FNR increased over almost all of East Asia, especially during 2015–2019. This increasing trend in FNR indicated the gradual shift from a volatile organic compound (VOC)-sensitive to a nitrogen oxide (NOₓ)-sensitive regime. The long-term changes in HCHO and NO₂ columns generally corresponded to anthropogenic non-methane VOC (NMVOC) and NOₓ emissions trends; however, anthropogenic sources did not explain the increasing HCHO column during 2015–2019. Because of the reduction in anthropogenic sources, the relative importance of biogenic NMVOC sources has been increasing and could have a larger impact on changing the O₃-sensitive regime over East Asia.
Keywords	Japan ; diagnostic techniques ; formaldehyde ; nitrogen dioxide ; ozone ; pollution ; troposphere ; volatile organic compounds ; China ; South Korea
Language	English
Dates of publication	2022-0909
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2513863-7
ISSN	2072-4292
ISSN	2072-4292
DOI	10.3390/rs14184512
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Returning long-range PM2.5 transport into the leeward of East Asia in 2021 after Chinese economic recovery from the COVID-19 pandemic

Syuichi Itahashi / Yuki Yamamura / Zhe Wang / Itsushi Uno

Scientific Reports, Vol 12, Iss 1, Pp 1-

2022 Volume 11

Abstract: Abstract Changes in the aerosol composition of sulfate (SO4 2−) and nitrate (NO3 −) from 2012 to 2019 have been captured as a paradigm shift in the region downwind of China. Specifically, SO4 2− dramatically decreased and NO3 − dramatically increased ... ...

Abstract	Abstract Changes in the aerosol composition of sulfate (SO4 2−) and nitrate (NO3 −) from 2012 to 2019 have been captured as a paradigm shift in the region downwind of China. Specifically, SO4 2− dramatically decreased and NO3 − dramatically increased over downwind locations such as western Japan due to the faster reduction of SO2 emissions than NO x emissions and the almost constant trend of NH3 emissions from China. Emissions from China sharply decreased during COVID-19 lockdowns in February–March 2020, after which China’s economic situation seemed to recover going into 2021. Given this substantial change in Chinese emissions, it is necessary to clarify the impact of long-range PM2.5 transport into the leeward of East Asia. In this study, ground-based aerosol compositions observed at three sites in western Japan were analysed. The concentrations of PM2.5, SO4 2− and NO3 − decreased in 2020 (during COVID-19) compared with 2018–2019 (before COVID-19). In 2021 (after COVID-19), PM2.5 and NO3 − increased and SO4 2− was unchanged. This suggests the returning long-range PM2.5 transport in 2021. From numerical simulations, the status of Chinese emissions during COVID-19 did not explain this returning impact in 2021. This study shows that the status of Chinese emissions in 2021 recovered to that before COVID-19.
Keywords	Medicine ; R ; Science ; Q
Subject code	950
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Incorporation of volcanic SO

Itahashi, Syuichi / Mathur, Rohit / Hogrefe, Christian / Napelenok, Sergey L / Zhang, Yang

Geoscientific model development

2022 Volume 14, Issue 9, Page(s) 5751–5768

Abstract: The state-of-the-science Community Multiscale Air Quality (CMAQ) Modeling System has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ). In this study, satellite-constrained estimation of the degassing ... ...

Abstract	The state-of-the-science Community Multiscale Air Quality (CMAQ) Modeling System has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ). In this study, satellite-constrained estimation of the degassing SO
Language	English
Publishing date	2022-03-09
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2456725-5
ISSN	1991-9603 ; 1991-959X
ISSN (online)	1991-9603
ISSN	1991-959X
DOI	10.5194/gmd-14-5751-2021
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Role of Dust and Iron Solubility in Sulfate Formation during the Long-Range Transport in East Asia Evidenced by

Itahashi, Syuichi / Hattori, Shohei / Ito, Akinori / Sadanaga, Yasuhiro / Yoshida, Naohiro / Matsuki, Atsushi

Environmental science & technology

2022 Volume 56, Issue 19, Page(s) 13634–13643

Abstract: Numerical models have been developed to elucidate air pollution caused by sulfate aerosols ( ... ...

Abstract	Numerical models have been developed to elucidate air pollution caused by sulfate aerosols (SO
MeSH term(s)	Aerosols/chemistry ; Air Pollutants/analysis ; China ; Dust ; Environmental Monitoring ; Far East ; Iron ; Oxygen Isotopes ; Solubility ; Sulfates ; Sulfur Dioxide/analysis ; Water/chemistry
Chemical Substances	Aerosols ; Air Pollutants ; Dust ; Oxygen Isotopes ; Sulfates ; Water (059QF0KO0R) ; Sulfur Dioxide (0UZA3422Q4) ; Iron (E1UOL152H7)
Language	English
Publishing date	2022-09-15
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.2c03574
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Advantages of Continuous Monitoring of Hourly PM2.5 Component Concentrations in Japan for Model Validation and Source Sensitivity Analyses

Satoru Chatani / Syuichi Itahashi / Kazuyo Yamaji

Asian Journal of Atmospheric Environment, Vol 15, Iss 2, Pp 1-

2021 Volume 29

Abstract: Continuous monitoring of hourly PM2.5 component concentrations has been performed in Japan. The objective of this study was to evaluate the advantages of continuous monitoring to obtain data that can be useful for regional air quality simulations. ... ...

Abstract	Continuous monitoring of hourly PM2.5 component concentrations has been performed in Japan. The objective of this study was to evaluate the advantages of continuous monitoring to obtain data that can be useful for regional air quality simulations. Inclusion of transboundary transport in the simulations improved the correlation between the observed and simulated hourly concentrations of SO4 2-, NO3 -, secondary organic aerosols (SOA), and metals in PM2.5. Black carbon was an exception, suggesting the overestimation of emissions in upwind countries. Including volcanic and dust emissions also improved the correlations between the observed and simulated hourly concentrations of SO4 2- and metals, respectively. However, despite the good correlation achieved by including transboundary transport, it also resulted in overestimated NO3 - and SOA concentrations in western Japan during the winter. Further improvements are necessary, such as balancing with SO4 2- and the dry deposition of gaseous HNO3 for NO3 -, and new treatment of the partitioning and aging of semivolatile organic aerosols, which have been incorporated into recent models for SOA. The differences in model performance with regard to simulating metal concentrations suggest imbalances in the speciation profiles used for countries other than Japan. Further, comparing the observed and simulated hourly concentrations helped identify the key processes driving air quality. This revealed evening peaks in black carbon concentrations, owing to the relatively stable atmosphere; and early morning peaks in NO3 - concentration, owing to the low temperature and high humidity through thermodynamic equilibrium. This study demonstrated that continuous monitoring of hourly variations in PM2.5 composition is valuable for understanding the roles of the emission sources and for improving future models, both of which contribute to deriving effective PM2.5 suppression strategies.
Keywords	pm2.5 composition ; regional air quality simulation ; continuous monitoring ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350
Subject code	333
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	Asian Association for Atmospheric Environment
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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