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| Titel: |
Two-years of NO<sub>3</sub> radical observations in the boundary layer over the Eastern Mediterranean |
| Auteur: |
M. Vrekoussis N. Mihalopoulos E. Gerasopoulos M. Kanakidou P. J. Crutzen J. Lelieveld |
| Verschenen in: |
Atmospheric chemistry and physics |
| Paginering: | Jaargang 7 (2007) nr. 2 pagina's 315-327 |
| Jaar: |
2007 |
| Inhoud: |
This is the first study that investigates the seasonal variability of nitrate (NO<sub>3</sub>) radicals in the marine boundary layer over the East Mediterranean Sea. An extensive data set of NO<sub>3</sub> radical observations on the north coast of Crete for more than two years (June 2001–September 2003) is presented here. NO<sub>3</sub> radicals follow a distinct seasonal dependency with the highest seasonally average mixing ratios in summer (5.6±1.2 pptv) and the lowest in winter (1.2±1.2 pptv). Episodes with high NO<sub>3</sub> mixing ratios have been encountered mainly in polluted air masses originating from mainland Greece, Central and East Europe, and Turkey. Ancillary measurements of ozone, nitrogen dioxide (NO<sub>2</sub>) and meteorological parameters have been conducted and used to reveal possible relationship with the observed NO<sub>3</sub> variability. The acquired NO<sub>2</sub> nighttime observations provide the up-to-date most complete overview of NO<sub>2</sub> temporal variability in the area. The data show correlations of the NO<sub>3</sub> nighttime mixing ratios with temperature (positive), relative humidity (negative) and to a lesser extend with O<sub>3</sub> (positive). As inferred from these observations, on average the major sink of NO<sub>3</sub> radicals in the area is the heterogeneous reaction of dinitrogen pentoxide (N<sub>2</sub>O<sub>5</sub>) on aqueous particles whereas the homogeneous gas phase reactions of NO<sub>3</sub> are most important during spring and summer. These observations support a significant contribution of NO<sub>3</sub> nighttime chemistry to the oxidizing capacity of the troposphere. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 21 van 22 gevonden artikelen
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