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Observations of the nitrate radical in the free troposphere at Izaña de Tenerife
Title: Observations of the nitrate radical in the free troposphere at Izaña de Tenerife
Authors: Carslaw, NicolaPlane, John M. C.Coe, HughCuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMET
Keywords: Nitrate radical; Free troposphere; Differential optical absorption spectroscopy
Issue Date: 1997
Publisher: American Geophysical Union
Citation: Journal of Geophysical Research: Atmospheres. 1997, 102(D9), p. 10613–10622
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Abstract: This paper reports direct measurements of the nitrate radical (NO3) 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 NO3 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 NO3 data with ancillary measurements of NO2 and O3 in a model shows that there are no important NO3 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 NO2 is too small for significant quantities of N2O5 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 NO3 at night was in excess of 2 hours, much longer than measured hitherto in the tropospheric boundary layer.
Sponsorship : This work was supported by the European Commission (contract EV5V-CT93-0321).
ISSN: 2169-897X
Appears in Collections:Artículos científicos 1995-1999

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