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Observations of the nitrate radical in the free troposphere at Izaña de Tenerife
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| Zeitschriftentitel: | Journal of Geophysical Research: Atmospheres |
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| Personen und Körperschaften: | , , , |
| In: | Journal of Geophysical Research: Atmospheres, 102, 1997, D9, S. 10613-10622 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| Zusammenfassung: | <jats:p>This paper reports direct measurements of the nitrate radical (NO<jats:sub>3</jats:sub>) in the lower free troposphere. The measurements were carried out at Izaña de Tenerife (2300 m altitude) in the Canary Islands during May 1994, using the technique of differential optical absorption spectroscopy (DOAS). The average nighttime NO<jats:sub>3</jats:sub> concentration in very clean air from the mid‐Atlantic was found to be 8 ppt, with a maximum observed concentration of about 20 ppt. Combining the NO<jats:sub>3</jats:sub> data with ancillary measurements of NO<jats:sub>2</jats:sub> and O<jats:sub>3</jats:sub> in a model shows that there are no important NO<jats:sub>3</jats:sub> scavengers in a part of the troposphere that is characterized by a very low relative humidity and aerosol particle count, and where the concentration of NO<jats:sub>2</jats:sub> is too small for significant quantities of N<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> to form. On occasion, the presence of a trace concentration of NO or an organic species such as α‐pinene is required to explain the observations. The lifetime of NO<jats:sub>3</jats:sub> at night was in excess of 2 hours, much longer than measured hitherto in the tropospheric boundary layer.</jats:p> |
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| Umfang: | 10613-10622 |
| ISSN: |
0148-0227
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| DOI: | 10.1029/96jd03512 |