Dispersion of Maritime Air Pollutants from Harbor Area into Major Port Cities Considering Characteristics of Local Wind Circulation in Korea

2021 ◽  
Vol 27 (6) ◽  
pp. 721-730
Author(s):  
Yongbum Kwon ◽  
◽  
Inhee Cho
Keyword(s):  
Air Pollutants ◽  
Port Cities ◽  
Local Wind ◽  
Wind Circulation ◽  
Maritime Air ◽  
Harbor Area

scholarly journals Air Pollution Flow Patterns in the Mexico City Region

Climate ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 128
Author(s):  
Alejandro Salcido ◽  
Susana Carreón-Sierra ◽  
Ana-Teresa Celada-Murillo
Keyword(s):  
Air Pollution ◽  
Cluster Analysis ◽  
Mexico City ◽  
Air Pollutants ◽  
Flow Patterns ◽  
Surface Flow ◽  
Flow State ◽  
City Region ◽  
Wind Circulation ◽  
Flow Vector

According to the Mexico City Emissions Inventory, mobile sources are responsible for approximately 86% of nitrogen oxide emissions in this region, and correspond to a NOx emission of 51 and 58 kilotons per year in Mexico City and the State of Mexico, respectively. Ozone levels in this region are often high and persist as one of the main problems of air pollution. Identifying the main scenarios for the transport and dispersion of air pollutants requires the knowledge of their flow patterns. This work examines the surface flow patterns of air pollutants (NO2, O3, SO2, and PM10) in the area of Mexico City (a region with strong orographic influences) over the period 2001–2010. The flow condition of a pollutant depends on the spatial distribution of its concentration and the mode of wind circulation in the region. We achieved the identification and characterization of the pollutant flow patterns through the exploitation of the 1-hour average values of the pollutant concentrations and wind data provided by the atmospheric monitoring network of Mexico City and the application of the k-means method of cluster analysis. The data objects for the cluster analysis were obtained by modeling Mexico City as a 4-cell spatial domain and describing, for each pollutant, the flow state in a cell by the spatial averages of the horizontal pollutant flow vector and its gradients (the divergence and curl of the flow vector). We identified seven patterns for wind circulation and nine patterns for each of NO2, O3, PM10, and SO2 pollutant flows. Their seasonal and annual average intensities and probabilities of occurrence were estimated.

The Relationship Analyses between High Concentration Ozone and Local Wind Circulation in Mexico City

2019 ◽  
Vol 38 (1) ◽  
pp. 231-255
Author(s):  
Yu-Woon Jang ◽  
Gangwoong Lee ◽  
Young-Sung Ghim ◽  
Taehyoung Lee ◽  
Il-Soo Park ◽  
...  
Keyword(s):  
Mexico City ◽  
Local Wind ◽  
High Concentration ◽  
Wind Circulation ◽  
The Relationship

scholarly journals Volcanic Ash Transport from Mount Asama to the Tokyo Metropolitan Area Influenced by Large-Scale Local Wind Circulation

2008 ◽  
Vol 47 (4) ◽  
pp. 1248-1265 ◽  
Author(s):  
Nobumitsu Tsunematsu ◽  
Tomohiro Nagai ◽  
Toshiyuki Murayama ◽  
Ahoro Adachi ◽  
Yasuhiro Murayama
Keyword(s):  
Metropolitan Area ◽  
Large Scale ◽  
Local Wind ◽  
The South ◽  
Tokyo Metropolitan ◽  
Tokyo Metropolitan Area ◽  
Wind Circulation ◽  
Synoptic Wind ◽  
Asama Volcano ◽  
Ash Transport

Abstract The eruption of the Mount Asama volcano on 16 September 2004 produced an ash cloud and led to ashfall in the Tokyo metropolitan area that lies on the Kanto Plain. Satellite images showed the ash cloud drifting toward the south in the morning but to the southeast in the afternoon. An aerosol lidar and a ceilometer, installed in the metropolitan area, continuously observed the southeastward-transported ash particles passing at altitudes of 2.6–4.5 km above mean sea level (MSL) in the nighttime. Results of meteorological analyses and numerical experiments showed that the south-to-southeasterly sea breezes and valley winds prevailed at altitudes below 1.5 km MSL over the Kanto Plain in the afternoon and the compensatory return flow (CRF) was formed aloft at altitudes of 1.5–4.5 km MSL as strong northwesterly winds, which were encouraged by a synoptic wind. The numerical experiments also showed that the direction of the ash transport turned from the south to the southeast following the formation of the northwesterly CRF. This demonstrates that the daytime ash transport was influenced by the CRF. The nocturnal ash transport, however, depended on the intensified synoptic wind. Thus, in addition to synoptic winds, the large-scale local wind circulation prevailing over the Kanto Plain can determine the direction of ash transport originating from the Mount Asama volcano and increase the possibility of ashfall in the Tokyo metropolitan area.

scholarly journals Role of local wind circulation in plume monitoring at Mt. Etna volcano (Sicily): Insights from a mesoscale numerical model

2004 ◽  
Vol 31 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Massimiliano Favalli ◽  
Francesco Mazzarini ◽  
Maria Teresa Pareschi ◽  
Enzo Boschi
Keyword(s):  
Numerical Model ◽  
Etna Volcano ◽  
Local Wind ◽  
Wind Circulation ◽  
Mt Etna
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