Airshed
In today's article we are going to delve into the topic of Airshed, which has captured the attention of experts and the general public. Airshed is a topic of great relevance today, since it impacts different aspects of society, economy, politics and culture. Throughout this article we will explore the different aspects of Airshed, analyzing its history, its current impact and possible future projections. In addition, we will examine the different perspectives and opinions that exist around Airshed, with the aim of providing a broad and complete vision on this topic. Join us in this exploration of Airshed and discover everything you need to know about this exciting topic!
An airshed is a geographical area where local topography and meteorology limit the dispersion of pollutants away from the area. They are formed by air masses moving across a landscape, thus influencing the atmospheric composition of that area. Their boundaries are loosely defined, but can be quantified. Airborne chemicals disperse throughout an airshed and enter bodies of water in the area.
Defining airsheds
Airsheds are difficult to define precisely because they are spatially variable and can change over time. Their boundaries may change due to weather conditions and the sources of pollutants. Airsheds can be quantified for specific events, by season, or over a long period of time. Scientists model the movement of air masses over time to construct the dimensions of the upwind and downwind airsheds for a region.
Urban Airshed Model (UAM)
The Urban Airshed Model (UAM) is a three-dimensional grid model that is used to simulate chemical and physical atmospheric processes. The United States Environmental Protection Agency uses this model to develop air quality plans for ozone in urban areas.
Uni-directional Impacts
The upwind airshed of a city represents the area where emissions and pollutants affecting that city originate. This includes compounds that form secondary pollutants such as fine particulate matter and ground level ozone. Downwind effects in airsheds are responsible for the spread of those pollutants outside of the city. The downwind airshed tends to affect a wider area than the upwind because they are a combination of the upwind airshed and pollutants produced within the city.
References
- ^ Sparling, D. W. (2016). Ecotoxicology essentials : environmental contaminants and their biological effects on Animals and plants. London, UK. ISBN 978-0-12-801961-0. OCLC 947118281.
{{cite book}}: CS1 maint: location missing publisher (link) - ^ a b Scheffe, Richard D.; Morris, Ralph E. (1993-03-01). "A review of the development and application of the Urban Airshed model". Atmospheric Environment. Part B. Urban Atmosphere. 27 (1): 23–39. Bibcode:1993AtmEB..27...23S. doi:10.1016/0957-1272(93)90043-6. ISSN 0957-1272.
- ^ Jones, Laurence; Reis, Stefan; Hutchins, Mike; Miller, James; He, Baihuiqian; Seifert-Dähnn, Isabel; Xu, Chong-Yu; Hagen-Zanker, Alex; Yu, Jingyan; Lin, Tao; Jia, Haifeng; Loiselle, Steven; Russel, Duncan; Sabel, Clive E.; Fletcher, David (2022-12-01). "Airsheds, watersheds and more – The flows that drive intra-extra-urban connections, and their implications for nature-based solutions (NBS)". Nature-Based Solutions. 2: 100040. doi:10.1016/j.nbsj.2022.100040. hdl:10871/131978. ISSN 2772-4115. S2CID 253170834.
