Influence of mixing layer height upon air pollution in urban and sub-urban areas
The mixing layer height is an important parameter characterising the potential of the atmospheric boundary layer to take up emitted air pollutants. During continuous measurements in Hanover, Germany, from 2001 until 2003 and around Munich, Germany, in summer and winter 2003 mixing layer heights (MLH...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Borntraeger
2006-12-01
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| Series: | Meteorologische Zeitschrift |
| Online Access: | http://dx.doi.org/10.1127/0941-2948/2006/0164 |
| _version_ | 1797320601349652480 |
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| author | Klaus Schäfer Stefan Emeis Herbert Hoffmann Carsten Jahn |
| author_facet | Klaus Schäfer Stefan Emeis Herbert Hoffmann Carsten Jahn |
| author_sort | Klaus Schäfer |
| collection | DOAJ |
| description | The mixing layer height is an important parameter characterising the potential of the atmospheric boundary layer to take up emitted air pollutants. During continuous measurements in Hanover, Germany, from 2001 until 2003 and around Munich, Germany, in summer and winter 2003 mixing layer heights (MLH) were determined by different remote sensing systems mainly from the thermal structure and turbulence of the air (SODAR), for some time from the aerosol layering of the air (ceilometer), and for a short period directly from the temperature profile (RASS). The temporal variations of the concentrations of PM10 and PM2.5 as well as of CO and NOx simultaneously measured near the surface were investigated and correlated with the MLH derived from SODAR data. The pollution measurements were performed inside a street canyon and at an urban background station close to Hanover and at three measurement locations inside and outside of Munich complementing the available monitoring networks. The analyses show that the correlations of pollutant concentrations with MLH are smallest inside street canyons. Correlations at the urban background stations are larger in winter than in summer, and they are larger for the urban stations than for the rural stations. It turns out further that the correlation of NOx concentrations with MLH is larger than the correlation of particles concentrations. Explanations for these findings must consider the varying emission source strengths for NOx and particles and the influence of gas-to-particle conversion within air masses especially during daytime in summer. |
| first_indexed | 2024-03-08T04:45:24Z |
| format | Article |
| id | doaj.art-0fe910bf7e0b41ab9e3246478587fff9 |
| institution | Directory Open Access Journal |
| issn | 0941-2948 |
| language | English |
| last_indexed | 2024-03-08T04:45:24Z |
| publishDate | 2006-12-01 |
| publisher | Borntraeger |
| record_format | Article |
| series | Meteorologische Zeitschrift |
| spelling | doaj.art-0fe910bf7e0b41ab9e3246478587fff92024-02-08T08:51:14ZengBorntraegerMeteorologische Zeitschrift0941-29482006-12-0115664765810.1127/0941-2948/2006/016455225Influence of mixing layer height upon air pollution in urban and sub-urban areasKlaus SchäferStefan EmeisHerbert HoffmannCarsten JahnThe mixing layer height is an important parameter characterising the potential of the atmospheric boundary layer to take up emitted air pollutants. During continuous measurements in Hanover, Germany, from 2001 until 2003 and around Munich, Germany, in summer and winter 2003 mixing layer heights (MLH) were determined by different remote sensing systems mainly from the thermal structure and turbulence of the air (SODAR), for some time from the aerosol layering of the air (ceilometer), and for a short period directly from the temperature profile (RASS). The temporal variations of the concentrations of PM10 and PM2.5 as well as of CO and NOx simultaneously measured near the surface were investigated and correlated with the MLH derived from SODAR data. The pollution measurements were performed inside a street canyon and at an urban background station close to Hanover and at three measurement locations inside and outside of Munich complementing the available monitoring networks. The analyses show that the correlations of pollutant concentrations with MLH are smallest inside street canyons. Correlations at the urban background stations are larger in winter than in summer, and they are larger for the urban stations than for the rural stations. It turns out further that the correlation of NOx concentrations with MLH is larger than the correlation of particles concentrations. Explanations for these findings must consider the varying emission source strengths for NOx and particles and the influence of gas-to-particle conversion within air masses especially during daytime in summer.http://dx.doi.org/10.1127/0941-2948/2006/0164 |
| spellingShingle | Klaus Schäfer Stefan Emeis Herbert Hoffmann Carsten Jahn Influence of mixing layer height upon air pollution in urban and sub-urban areas Meteorologische Zeitschrift |
| title | Influence of mixing layer height upon air pollution in urban and sub-urban areas |
| title_full | Influence of mixing layer height upon air pollution in urban and sub-urban areas |
| title_fullStr | Influence of mixing layer height upon air pollution in urban and sub-urban areas |
| title_full_unstemmed | Influence of mixing layer height upon air pollution in urban and sub-urban areas |
| title_short | Influence of mixing layer height upon air pollution in urban and sub-urban areas |
| title_sort | influence of mixing layer height upon air pollution in urban and sub urban areas |
| url | http://dx.doi.org/10.1127/0941-2948/2006/0164 |
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