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  Seasonal variations of a mixing layer in the lowermost stratosphere as identified by the CO-O3 correlation from in situ measurements

Hoor, P., Fischer, H., Lange, L., Lelieveld, J., & Brunner, D. (2002). Seasonal variations of a mixing layer in the lowermost stratosphere as identified by the CO-O3 correlation from in situ measurements. Journal of Geophysical Research, 107(D5-D6): 4044. doi:10.1029/2000JD000289.

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Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Hoor, P.1, Author           
Fischer, H.1, Author           
Lange, L.1, Author           
Lelieveld, J.1, Author           
Brunner, D., Author
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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Free keywords: extratropical tropopause; cross tropopause transport; carbon monoxide; airborne measurements; irreversible mixing; seasonality
 Abstract: [1] Within the Stratosphere Troposphere Experiment by Aircraft Measurements (STREAM) project, airborne measurements of various trace species such as CO, CO2, N2O, and O-3 have been performed in several years and seasons. Here we focus on a summer campaign conducted from Timmins (Canada, 47degreesN, 80degreesW) in July 1998 and winter measurements carried out in March 1997 from Kiruna (Sweden, 68degreesN, 20degreesE). From correlations between CO and O-3 we identify a mixing layer in the lowermost stratosphere of which the vertical extent shows a significant seasonal variability. Troposphere to stratosphere exchange appears to be more vigorous in summer, although CO mixing ratios of the order of 15 ppbv indicate the presence of aged stratospheric air. While a significant tropospheric influence was observed up to potential temperatures of Theta = 330 K in March, the mixing layer in July increased to = 360 K. In addition, its elevation above the tropopause also showed an increase. The CO-O-3 correlation indicates that the higher elevation in July is most likely caused by a stronger contribution of subtropical tropospheric air, which was mixed into the lowermost stratosphere at the subtropical jet.

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Language(s): eng - English
 Dates: 2002-03
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18188
ISI: 000178892700007
DOI: 10.1029/2000JD000289
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D5-D6) Sequence Number: 4044 Start / End Page: - Identifier: ISSN: 0747-7309