Tropical and extratropical tropospheric air in the lowermost stratosphere over Europe: A CO-based budget

Details Tropical and extratropical tropospheric air in the lowermost stratosphere over Europe: A CO-based budget Tropical and extratropical tropospheric air in the lowermost stratosphere over Europe: A CO-based budget

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207802h&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 7, CiteID L07802

Physics

20

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Stratosphere/Troposphere Interactions

Scientific paper

We present a new approach to calculate a trace gas budget for the lowermost stratosphere based on airborne CO measurements. The measurements were obtained during the SPURT-project (SPURT in German: Trace gas transport in the tropopause region) and covered the tropopause region over Europe from 35°-75°N during different seasons. Using CO as a tracer for tropospheric air we quantified the contribution of three source regions to the composition of the lowermost stratosphere. Influence from the extratropical troposphere mainly contributes to the mixing layer above the local tropopause, where it decreases rapidly to less than 25% within a potential temperature range of 25 K above the local tropopause. With increasing distance from the tropopause mixing layer, the tropospheric fraction is dominated by influence from the tropics. During winter and spring the latter contributes about 35% to the chemical composition of the lowermost stratosphere over Europe, increasing to about 55% in summer and autumn.

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