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Quantifying transport into the Arctic lowermost stratosphere

Werner, A. and Volk, C. M. and Ivanova, E. V. and Wetter, T. and Schiller, C. and Schlager, H. and Konopka, P. (2010) Quantifying transport into the Arctic lowermost stratosphere. Atmospheric Chemistry and Physics, 10, pp. 11623-11639. DOI: 10.5194/acp-10-11623-2010.

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Official URL: http://www.atmos-chem-phys.org/10/11623/2010/acp-10-11623-2010.html


n-situ measurements of the long-lived trace gases N2O, CFC-11 (CCl3F), H-1211 (CBrClF2), CH4, O3 and H2O performed in the Arctic winter 2003 on board the high-altitude aircraft M55 Geophysica are presented and used to study transport into the lowermost stratosphere (LMS). Fractions of air in the LMS originating in i) the troposphere, ii) the extra-vortex stratosphere above 400 K and iii) the Arctic vortex above 400 K are determined using a simple mass balance calculation. The analysis exhibits a strong tropospheric influence of 50% 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% 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% 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.

Document Type:Article
Title:Quantifying transport into the Arctic lowermost stratosphere
AuthorsInstitution or Email of Authors
Werner, A.Univ. Frankfurt
Volk, C. M.Univ. Frankfurt
Ivanova, E. V.Univ. Frankfurt
Wetter, T.FZ Jülich, Jülich
Schiller, C.FZ Jülich, Jülich
Schlager, H.DLR
Konopka, P.FZ Jülich, Jülich
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 11623-11639
Keywords:Arctic, pollution, lowermost stratosphere
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Yasemin Yilmaz
Deposited On:15 Dec 2009 14:29
Last Modified:12 Dec 2013 20:49

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