Tracer correlations in the northern high latitude lowermost stratosphere: Influence of cross-tropopause mass exchange

H Fischer, FG Wienhold, P Hoor, O Bujok, C Schiller, P Siegmund, M Ambaum, HA Scheeren, J Lelieveld

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Abstract

We present an analysis of trace gas correlations in the lowermost stratosphere. In-situ aircraft measurements of CO, N(2)O, NO(y) and O(3) Obtained during the STREAM 1997 winter campaign, have been used to investigate the role of cross-tropopause mass exchange on tracer-tracer relations. At altitudes several;kilometers above the local tropopause, undisturbed stratospheric air was found with NO(y)/NO(y)* ratios close to unity, NO(y)/O(3) about 0.003 - 0.006 and CO mixing ratios as low as 20 ppbv (NO(y)* is a proxy for total reactive nitrogen derived from NO(y)-N(2)O relations measured in the stratosphere). Mixing of tropospheric-air into the lowermost stratosphere has been identified by enhanced ratios of NO(y)/NO(y)* and NO(y)/O(3), and from scatter plots of CO versus O(3). The enhanced NO(y)/O(3) ratio in the lowermost stratospheric mixing zone points to a reduced efficiency of O(3) formation from aircraft NO(x) emissions.

Original languageEnglish
Pages (from-to)97-100
Number of pages4
JournalGeophysical research letters
Volume27
Issue number1
DOIs
Publication statusPublished - 1-Jan-2000
Externally publishedYes

Keywords

  • LOWER ARCTIC STRATOSPHERE
  • TOTAL REACTIVE NITROGEN
  • TROPOSPHERE EXPERIMENT
  • AIRCRAFT MEASUREMENTS
  • AASE-II
  • NOY
  • O-3
  • DISTRIBUTIONS
  • STREAM
  • WINTER

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