Temporally and Spatially Resolved Air Pollution in Georgia Using Fused Ambient Monitor Data and Chemical Transport Model Results

2014 ◽  
pp. 301-306 ◽  
Author(s):  
Sheila A. Sororian ◽  
Heather A. Holmes ◽  
Mariel Friberg ◽  
Cesunica Ivey ◽  
Yongtao Hu ◽  
...  
Keyword(s):  
Air Pollution ◽  
Transport Model ◽  
Chemical Transport ◽  
Chemical Transport Model ◽  
Spatially Resolved ◽  
Monitor Data

scholarly journals Nitrate transboundary heavy pollution over East Asia in winter

2017 ◽  
Vol 17 (6) ◽  
pp. 3823-3843 ◽  
Author(s):  
Syuichi Itahashi ◽  
Itsushi Uno ◽  
Kazuo Osada ◽  
Yusuke Kamiguchi ◽  
Shigekazu Yamamoto ◽  
...  
Keyword(s):  
Air Pollution ◽  
East Asia ◽  
Transport Model ◽  
Chemical Transport ◽  
First Episode ◽  
Chemical Transport Model ◽  
High Concentration ◽  
Air Mass ◽  
Transboundary Air Pollution ◽  
Western Japan

Abstract. High PM2. 5 concentrations of around 100 µg m−3 were observed twice during an intensive observation campaign in January 2015 at Fukuoka (33.52° N, 130.47° E) in western Japan. These events were analyzed comprehensively with a regional chemical transport model and synergetic ground-based observations with state-of-the-art measurement systems, which can capture the behavior of secondary inorganic aerosols (SO42−, NO3−, and NH4+). The first episode of high PM2. 5 concentration was dominated by NO3− (type N) and the second episode by SO42− (type S). The concentration of NH4+ (the counterion for SO42− and NO3−) was high for both types. A sensitivity simulation in the chemical transport model showed that the dominant contribution was from transboundary air pollution for both types. To investigate the differences between these types further, the chemical transport model results were examined, and a backward trajectory analysis was used to provide additional information. During both types of episodes, high concentrations of NO3− were found above China, and an air mass that originated from northeast China reached Fukuoka. The travel time from the coastline of China to Fukuoka differed between types: it was 18 h for type N and 24 h for type S. The conversion ratio of SO2 to SO42− (Fs) was less than 0.1 for type N, but reached 0.3 for type S as the air mass approached Fukuoka. The higher Fs for type S was related to the higher relative humidity and the concentration of HO2, which produces H2O2, the most effective oxidant for the aqueous-phase production of SO42−. Analyzing the gas ratio as an indicator of the sensitivity of NO3− to changes in SO42− and NH4+ showed that the air mass over China was NH3-rich for type N, but almost NH3-neutral for type S. Thus, although the high concentration of NO3− above China gradually decreased during transport from China to Fukuoka, higher NO3− concentrations were maintained during transport owing to the lower SO42− for type N. In contrast, for type S, the production of SO42− led to the decomposition of NH4NO3, and more SO42− was transported. Notably, the type N transport pattern was limited to western Japan, especially the island of Kyushu. Transboundary air pollution dominated by SO42− (type S) has been recognized as a major pattern of pollution over East Asia. However, our study confirms the importance of transboundary air pollution dominated by NO3−, which will help refine our understanding of transboundary heavy PM2. 5 pollution in winter over East Asia.

Simulation of spread of air pollution plumes from forest fires with the use of COSMO-Ru7-ART chemical-transport model

2014 ◽  
Vol 27 (3) ◽  
pp. 268-274 ◽  
Author(s):  
G. V. Surkova ◽  
D. V. Blinov ◽  
A. A. Kirsanov ◽  
A. P. Revokatova ◽  
G. S. Rivin
Keyword(s):  
Air Pollution ◽  
Forest Fires ◽  
Transport Model ◽  
Chemical Transport ◽  
Chemical Transport Model ◽  
Pollution Plumes

scholarly journals Nitrate transboundary heavy pollution over East Asia in winter

2016 ◽  
Author(s):  
Syuichi Itahashi ◽  
Itsushi Uno ◽  
Kazuo Osada ◽  
Yusuke Kamiguchi ◽  
Shigekazu Yamamoto ◽  
...  
Keyword(s):  
Air Pollution ◽  
East Asia ◽  
Transport Model ◽  
Chemical Transport ◽  
First Episode ◽  
Chemical Transport Model ◽  
Air Mass ◽  
Transboundary Air Pollution ◽  
Heavy Pollution ◽  
Major Acid

Abstract. High PM2.5 concentrations reaching around 100 µg/m3 were observed twice during an intensive observation campaign in January 2015 at Fukuoka (33.52° N, 130.47° E) in western Japan. These events were analyzed comprehensively by a regional chemical transport model and synergetic ground-based observations with state-of-the-art measurement systems, which can capture the behavior of secondary inorganic aerosols (SO42−, NO3−, and NH4+). The first episode was dominated by NO3− (type N), whereas the second episode was dominated by SO42− (type S). The concentration of NH4+, which is the counterion for SO42− and NO3−, was high for both types. The sensitivity simulation of the chemical transport model showed that the dominant contribution was from transboundary air pollution for both types. To investigate the differences between these types of transboundary heavy pollution further, the chemical transport model results were examined in combination with the backward trajectory analysis. The air mass originated from northeast China and reached Fukuoka for both types, but the traveling time from the coastline of China to Fukuoka was 18 h for type N and 24 h for type S. The conversion ratio of SO2 to SO42− (Fs) was less than 0.1 for type N, but reached 0.3 for type S as the air mass approached Fukuoka. The higher Fs for type S was related to the higher relative humidity and concentration of HO2, which produces the most effective oxidant, H2O2, for the aqueous-phase production of SO42−. Analyzing the gas ratio, which is an indicator of the sensitivity of NO3− to changes in SO42− and NH4+, showed that the air mass over China was super NH3-rich for type N, but was almost NH3-neutral for type S. Higher NO3− concentrations were maintained during transport owing to the lower SO42− for type N, whereas the production of SO42− led to decomposition of NH4NO3 and more SO42− was transported for type S. The transboundary air pollution dominated by SO42− in type S is a major acid transport process over East Asia. However, our study confirms the importance of the transboundary air pollution dominated by NO3− (type N), which will help refine our understanding of the transboundary heavy PM2.5 pollution in winter over East Asia.

scholarly journals The EMEP MSC-W chemical transport model – Part 1: Model description

2012 ◽  
Vol 12 (2) ◽  
pp. 3781-3874 ◽  
Author(s):  
D. Simpson ◽  
A. Benedictow ◽  
H. Berge ◽  
R. Bergström ◽  
L. D. Emberson ◽  
...  
Keyword(s):  
Air Pollution ◽  
Input Data ◽  
Transport Model ◽  
Monitoring And Evaluation ◽  
Ground Level ◽  
Chemical Transport ◽  
Model Description ◽  
Chemical Transport Model ◽  
Model Calculations ◽  
Model Code

Abstract. The Meteorological Synthesizing Centre-West (MSC-W) of the European Monitoring and Evaluation Programme (EMEP) has been performing model calculations in support of the Convention on Long Range Transboundary Air Pollution (CLRTAP) for more than 30 yr. The EMEP MSC-W chemical transport model is still one of the key tools within European air pollution policy assessments. Traditionally, the EMEP model has covered all of Europe with a resolution of about 50 × 50 km2, and extending vertically from ground level to the tropopause (100 hPa). The model has undergone substantial development in recent years, and is now applied on scales ranging from local (ca. 5 km grid size) to global (with 1 degree resolution). The model is used to simulate photo-oxidants and both inorganic and organic aerosols. In 2008 the EMEP model was released for the first time as public domain code, along with all required input data for model runs for one year. Since then, many changes have been made to the model physics, and input data. The second release of the EMEP MSC-W model became available in mid 2011, and a new release is targeted for early 2012. This publication is intended to document this third release of the EMEP MSC-W model. The model formulations are given, along with details of input data-sets which are used, and brief background on some of the choices made in the formulation are presented. The model code itself is available at www.emep.int, along with the data required to run for a full year over Europe.

Method for Fusing Observational Data and Chemical Transport Model Simulations To Estimate Spatiotemporally Resolved Ambient Air Pollution

2016 ◽  
Vol 50 (7) ◽  
pp. 3695-3705 ◽  
Author(s):  
Mariel D. Friberg ◽  
Xinxin Zhai ◽  
Heather A. Holmes ◽  
Howard H. Chang ◽  
Matthew J. Strickland ◽  
...  
Keyword(s):  
Air Pollution ◽  
Observational Data ◽  
Transport Model ◽  
Chemical Transport ◽  
Ambient Air ◽  
Ambient Air Pollution ◽  
Chemical Transport Model ◽  
Model Simulations

scholarly journals The EMEP MSC-W chemical transport model – technical description

2012 ◽  
Vol 12 (16) ◽  
pp. 7825-7865 ◽  
Author(s):  
D. Simpson ◽  
A. Benedictow ◽  
H. Berge ◽  
R. Bergström ◽  
L. D. Emberson ◽  
...  
Keyword(s):  
Air Pollution ◽  
Input Data ◽  
Transport Model ◽  
Monitoring And Evaluation ◽  
Ground Level ◽  
Chemical Transport ◽  
Data Sets ◽  
Chemical Transport Model ◽  
Model Calculations ◽  
Model Code

Abstract. The Meteorological Synthesizing Centre-West (MSC-W) of the European Monitoring and Evaluation Programme (EMEP) has been performing model calculations in support of the Convention on Long Range Transboundary Air Pollution (CLRTAP) for more than 30 years. The EMEP MSC-W chemical transport model is still one of the key tools within European air pollution policy assessments. Traditionally, the model has covered all of Europe with a resolution of about 50 km × 50 km, and extending vertically from ground level to the tropopause (100 hPa). The model has changed extensively over the last ten years, however, with flexible processing of chemical schemes, meteorological inputs, and with nesting capability: the code is now applied on scales ranging from local (ca. 5 km grid size) to global (with 1 degree resolution). The model is used to simulate photo-oxidants and both inorganic and organic aerosols. In 2008 the EMEP model was released for the first time as public domain code, along with all required input data for model runs for one year. The second release of the EMEP MSC-W model became available in mid 2011, and a new release is targeted for summer 2012. This publication is intended to document this third release of the EMEP MSC-W model. The model formulations are given, along with details of input data-sets which are used, and a brief background on some of the choices made in the formulation is presented. The model code itself is available at www.emep.int, along with the data required to run for a full year over Europe.

scholarly journals The UIUC three-dimensional stratospheric chemical transport model: Description and evaluation of the simulated source gases and ozone

1999 ◽  
Vol 104 (D9) ◽  
pp. 11755-11781 ◽  
Author(s):  
Eugene V. Rozanov ◽  
Vladimir A. Zubov ◽  
Michael E. Schlesinger ◽  
Fanglin Yang ◽  
Natalia G. Andronova
Keyword(s):  
Transport Model ◽  
Three Dimensional ◽  
Chemical Transport ◽  
Model Description ◽  
Chemical Transport Model ◽  
Simulated Source
Sign in / Sign up

Export Citation Format

Share Document