A quantitative analysis of stratospheric HCl, HNO3, and O3 in the tropopause region near the subtropical jet. Issue 9 (14th May 2014)

• Record Type: Journal Article
• Authors: Jurkat, T.; Voigt, C.; Kaufmann, S.; Zahn, A.; Sprenger, M.; Hoor, P.; Bozem, H.; Müller, S.; Dörnbrack, A.; Schlager, H.; Bönisch, H.; Engel, A.
• Is Part Of: Geophysical research letters. Volume 41:Issue 9(2014:May)
• Page Start: 3315
• Page End: 3321
• Publication Date: 2014-05-14
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2013GL059159
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main" id="grl51521-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The effects of chemical two‐way mixing on the Extratropical Transition Layer (ExTL) near the subtropical jet are investigated by stratospheric tracer‐tracer correlations. To this end, in situ measurements were performed west of Africa (25–32°N) during the Transport and Composition of the Upper Troposphere Lower Stratosphere (UTLS)/Earth System Model Validation (TACTS/ESMVal) mission in August/September 2012. The Atmospheric chemical Ionization Mass Spectrometer sampling HCl and HNO₃ was for the first time deployed on the new German High Altitude and Long range research aircraft (HALO). Measurements of O₃, CO, European Centre for Medium‐Range Weather Forecasts (ECMWF) analysis, and the tight correlation of the unambiguous tracer HCl to O₃ and HNO₃ in the lower stratosphere were used to quantify the stratospheric content of these species in the ExTL. With increasing distance from the tropopause, the stratospheric content increased from 10<italic>%</italic> to 100<italic>%</italic> with differing profiles for HNO₃ and O₃. Tropospheric fractions of 20<italic>%</italic> HNO₃ and 40<italic>%</italic> O₃ were detected up to a distance of 30 K above the tropopause.</p> </abstract>