ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-11623-2010 Quantifying transport into the Arctic lowermost stratosphere Werner A. 1 4 Volk C. M. 1 5 Ivanova E. V. 1 Wetter T. 1 4 Schiller C. 2 Schlager H. 3 Konopka P. 2 Institute for Atmospheric and Environmental Sciences, University of Frankfurt, Germany Institute of Chemistry and Dynamics of the Geosphere, Research Center Jülich, Germany Deutsches Zentrum für Luft und Raumfahrt, Institute of Atmospheric Physics, Oberpfaffenhofen, Germany now at: German Meteorological Service, DWD, Germany now at: Department of Physics, University of Wuppertal, Germany 08 12 2010 10 23 11623 11639 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/11623/2010/acp-10-11623-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/11623/2010/acp-10-11623-2010.pdf

In the Arctic winter 2003, in-situ measurements of the long-lived trace gases N<sub>2</sub>O, CFC-11 (CCl<sub>3</sub>F), H-1211 (CBrClF<sub>2</sub>), CH<sub>4</sub>, O<sub>3</sub> and H<sub>2</sub>O have been performed on board the high-altitude aircraft M55 Geophysica. The data are presented and used to study transport into the lowermost stratosphere (LMS). The LMS can be regarded as a mixture of fractions of air originating in (i) the troposphere, (ii) the extra-vortex stratosphere above 400 K and (iii) the Arctic vortex above 400 K. These fractions are determined using a simple mass balance calculation. The analysis exhibits a strong tropospheric influence of 50% ± 15% or more in the lowest 20 K of the high-latitude LMS. Above this region the LMS is dominated by air masses having descended from above 400 K. Below the Arctic vortex region at potential temperatures above 360 K, air in the LMS is a mixture of extra-vortex stratospheric and vortex air masses. The vortex fraction increases from about 40% ± 15% at 360 K to 100% at 400 K for equivalent latitudes >70° N. This influence of air masses descending through the bottom of the polar vortex increases over the course of the winter. By the end of winter a significant fraction of 30% ± 10% vortex air in the LMS is found even at an equivalent latitude of 40° N. Since the chemical and dynamical history of vortex air is distinct from that of mid-latitude stratospheric air masses, this study implies that the composition of the mid- to high-latitude LMS during late winter and spring is significantly influenced by the Arctic vortex.

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