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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, Nicola; Plane, John M. C.; Coe, Hugh; Cuevas Agulló, Emilio
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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 |
Publisher version: | https://dx.doi.org/10.1029/96JD03512 |
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). |
URI: | http://hdl.handle.net/20.500.11765/2220 |
ISSN: | 2169-897X 2169-8996 |
Appears in Collections: | Artículos científicos 1995-1999 |
Files in This Item:
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![]() | Carslaw_1997-JGRSE.pdf | 1,06 MB | Adobe PDF | ![]() View/Open |
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