In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 105, No. D1 ( 2000-01-20), p. 1563-1583
Abstract:
The Schauinsland Ozone Precursor Experiment (SLOPE96) campaign was conducted in June 1996 to study the physicochemical transformation of pollutants and the production of photooxidants during transport from the city of Freiburg to the Schauinsland mountain. For this purpose, chemical surface measurements were made at the entrance of the valley Großes Tal, and close to the Schauinsland summit, at 1200 m altitude on a saddle at the end of the valley. In addition, measurements of ozone, NO 2 , and meteorological parameters were made on two tethered balloons and aboard a small aircraft. This paper describes the experimental setup and the measurements of ozone, odd‐nitrogen compounds, carbonyl compounds, CO, and photolysis frequencies made during SLOPE96. The various instruments used on the different platforms were harmonized on the basis of intercomparison experiments in order to achieve a consistent picture. Large precursor concentrations from the nearby city of Freiburg are transported to Schauinsland in a valley wind system during stagnant high‐pressure conditions. These conditions occurred only on 2 days of the campaign, and only 1 day (June 5) was predictable enough to allow for deployment of the aircraft and the balloons. An OH concentration of 8 ‐ 10× 0 6 cm −3 is derived from the rate of change of HNO 3 and NO 2 on June 5 at Schauinsland (1.5–3 ppb NO 2 ; J O1 D ≈ 2 × 10 −5 s −1 ), assuming quasi steady state and a homogeneous air mass. The ozone production rate as determined from the photostationary state of NO x at Schauinsland reached maximum daily values between 15 and 60 ppb h 1 around noontime. On average, P(O 3 ) comprised about 30% of the photolysis rate of NO 2 . Similar to earlier observations at Schauinsland, a good correlation between P(O 3 ) and the product of UV radiation and precursor concentrations was found.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/1999JD900918
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2000
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