Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower
Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT (telecommunications) Tower 160 m above street level in central London during the REPARTEE II...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-10-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/10/9781/2010/acp-10-9781-2010.pdf |
| _version_ | 1818484410822950912 |
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| author | E. Nemitz R. M. Harrison M. Dall'Osto W. J. Bloss S. M. Ball J. M. Langridge A. K. Benton R. L. Jones |
| author_facet | E. Nemitz R. M. Harrison M. Dall'Osto W. J. Bloss S. M. Ball J. M. Langridge A. K. Benton R. L. Jones |
| author_sort | E. Nemitz |
| collection | DOAJ |
| description | Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT (telecommunications) Tower 160 m above street level in central London during the REPARTEE II campaign in October and November 2007. Substantial variability was observed in these night-time nitrogen compounds: peak NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub> mixing ratios reached 800 pptv, whereas the mean night-time NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub> was approximately 30 pptv. Additionally, [NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub>] showed negative correlations with [NO] and [NO<sub>2</sub>] and a positive correlation with [O<sub>3</sub>]. Co-measurements of temperature and NO<sub>2</sub> from the BT Tower were used to calculate the equilibrium partitioning between NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> which was always found to strongly favour N<sub>2</sub>O<sub>5</sub> (NO<sub>3</sub>/N<sub>2</sub>O<sub>5</sub>=0.01 to 0.04). Two methods are used to calculate the lifetimes for NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub>, the results being compared and discussed in terms of the implications for the night-time oxidation of nitrogen oxides and the night-time sinks for NO<sub>y</sub>. |
| first_indexed | 2024-12-10T15:55:08Z |
| format | Article |
| id | doaj.art-163564f8c7094200989eb91c85a15afc |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-10T15:55:08Z |
| publishDate | 2010-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-163564f8c7094200989eb91c85a15afc2022-12-22T01:42:40ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242010-10-0110209781979510.5194/acp-10-9781-2010Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT TowerE. NemitzR. M. HarrisonM. Dall'OstoW. J. BlossS. M. BallJ. M. LangridgeA. K. BentonR. L. JonesBroadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT (telecommunications) Tower 160 m above street level in central London during the REPARTEE II campaign in October and November 2007. Substantial variability was observed in these night-time nitrogen compounds: peak NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub> mixing ratios reached 800 pptv, whereas the mean night-time NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub> was approximately 30 pptv. Additionally, [NO<sub>3</sub>+N<sub>2</sub>O<sub>5</sub>] showed negative correlations with [NO] and [NO<sub>2</sub>] and a positive correlation with [O<sub>3</sub>]. Co-measurements of temperature and NO<sub>2</sub> from the BT Tower were used to calculate the equilibrium partitioning between NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> which was always found to strongly favour N<sub>2</sub>O<sub>5</sub> (NO<sub>3</sub>/N<sub>2</sub>O<sub>5</sub>=0.01 to 0.04). Two methods are used to calculate the lifetimes for NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub>, the results being compared and discussed in terms of the implications for the night-time oxidation of nitrogen oxides and the night-time sinks for NO<sub>y</sub>.http://www.atmos-chem-phys.net/10/9781/2010/acp-10-9781-2010.pdf |
| spellingShingle | E. Nemitz R. M. Harrison M. Dall'Osto W. J. Bloss S. M. Ball J. M. Langridge A. K. Benton R. L. Jones Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower Atmospheric Chemistry and Physics |
| title | Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower |
| title_full | Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower |
| title_fullStr | Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower |
| title_full_unstemmed | Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower |
| title_short | Night-time chemistry above London: measurements of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> from the BT Tower |
| title_sort | night time chemistry above london measurements of no sub 3 sub and n sub 2 sub o sub 5 sub from the bt tower |
| url | http://www.atmos-chem-phys.net/10/9781/2010/acp-10-9781-2010.pdf |
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