An unusual springtime ozone episode at high elevation in the Swiss Alps: contributions both from cross-tropopause exchange and from the boundary layer

Authors
Schuepbach, E Davies, TD Massacand, AC
Citation
E. Schuepbach et al., An unusual springtime ozone episode at high elevation in the Swiss Alps: contributions both from cross-tropopause exchange and from the boundary layer, ATMOS ENVIR, 33(11), 1999, pp. 1735-1744
Citations number
43
Categorie Soggetti
Environment/Ecology,"Earth Sciences
Journal title
ATMOSPHERIC ENVIRONMENT
ISSN journal
13522310 → ACNP
Volume
33
Issue
11
Year of publication
1999
Pages
1735 - 1744
Database
ISI
SICI code
1352-2310(199905)33:11<1735:AUSOEA>2.0.ZU;2-0
Abstract
An unusually "smooth" springtime ozone episode (maximum 97 ppb(v)) at the J ungfraujoch Observatory (3580 m asl) in the Swiss Alps is described. Analys is of meteorological variables is combined with back-trajectory analysis, a nd numerical simulations from a mesoscale model nested within a limited are a model to examine the origin of the episode. Cross-tropopause exchange on the western flank of an upper trough, deep convection in a Gulf of Genoa cy clone, and the northwards advection of boundary-layer air (with possible in situ photochemistry) all combined to produce the highest ozone concentrati on of the year (1987) at the mountain site. (C) 1999 Elsevier Science Ltd. All rights reserved.