Air stagnation

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Air stagnation is a phenomenon which occurs when an air mass remains over an area for an extended period. Stagnation events strongly correlates with poor air quality. [1] Due to light winds and lack of precipitation, pollutants cannot be cleared from the air, either gaseous (like ozone) or particulate (like soot or dust). Subsidence produced directly under the subtropical ridge can lead to a buildup of particulates in urban areas under the ridge, leading to widespread haze.[2] If the low level relative humidity rises towards 100 percent overnight, fog can form.[3] In the United States, the National Weather Service issues an Air Stagnation Advisory when these conditions are likely to occur.[4]

In the U.S., the numbers of stagnation days during winter and spring tend to much smaller than those during summer and fall.[5] Spatial variations during winter and spring tend to be incoherent as well.[6]


References

  1. ^ Leung, L. Ruby; Gustafson Jr, William I. (Aug 26, 2005). "Potential regional climate change and implications to U.S. air quality". Geophysical Research Letters. 32 (16). Bibcode:2005GeoRL..3216711L. doi:10.1029/2005GL022911. 
  2. ^ Myanmar government (2007). Haze. Archived 2008-02-24 at the Wayback Machine. Retrieved on 2007-02-11.
  3. ^ Robert Tardif (2002). Fog characteristics. Archived 2011-05-20 at the Wayback Machine. University Corporation for Atmospheric Research. Retrieved on 2007-02-11.
  4. ^ National Weather Service glossary. Air Stagnation. Retrieved on 2008-05-31.
  5. ^ Leung, L. Ruby; Gustafson Jr, William I. (Aug 26, 2005). "Potential regional climate change and implications to U.S. air quality". Geophysical Research Letters. 32 (16). Bibcode:2005GeoRL..3216711L. doi:10.1029/2005GL022911. 
  6. ^ Leung, L. Ruby; Gustafson Jr, William I. (Aug 26, 2005). "Potential regional climate change and implications to U.S. air quality". Geophysical Research Letters. 32 (16). Bibcode:2005GeoRL..3216711L. doi:10.1029/2005GL022911. 


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