Analysis of differences in ozone patterns over land and over water
- TNO Institute of Environmental Sciences, Delft (Netherlands)
In Eastern Asia and the Pacific Rim, as well as in Northern America and Western Europe, a substantial percentage if not most of urbanized and industrial areas are located in coastal areas. These loads to areas over land with a very high emission density per unit area adjacent to areas over water with a very low emission density. Next to large emission gradients, these coastal areas are also influenced by gradients in meteorological conditions leading to land-sea breeze effects. Photo-oxidant formation and especially ozone has still an other difference between land and sea, the large gradient in dry deposition fluxes. As a consequence of all these differences, ozone over coastal urban and industrialized areas is substantially different from ozone over the same type of areas more inland. An analysis of ozone measurements over Europe clearly shows this difference. Coastal stations show a more pronounced spring time ozone maximum, more inland stations show a maximum later in the season. Data analysis and analyses using the Eulerian LOTOS (long term ozone simulation) model show that these differences are due to the gradients in emission density, in meteorological conditions and in dry deposition. A case study concerning the Iberian Peninsula, covering Spain and Portugal surrounded by the Mediterranean and Atlantic sea show the rather high ozone ring of ozone levels around the Peninsula, again due to the gradient between land and sea. These coastal phenomena are of scientific interest, but might also have a clear impact on the affectivity of abatement strategies. An attempt is made to generalize the observed coastal phenomena to an overall picture valid to coastal areas, both in Europe, Northern America, Eastern Asia and the Pacific Rim.
- OSTI ID:
- 466101
- Report Number(s):
- CONF-9606185-; TRN: 96:005931-0050
- Resource Relation:
- Conference: 5. international conference on atmospheric sciences and applications to air quality, Seattle, WA (United States), 18-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of The 5th international atmospheric sciences and applications to air quality conference; PB: 322 p.
- Country of Publication:
- United States
- Language:
- English
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