Journal Article

PreJuSER-30239

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A case study of trace gas transports near the tropopause

Schaeler, B. ; Offermann, D. ; Hoffmann, L. ; Riese, M.FZJ*

2004
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/S0273-1177(03)00588-X

Abstract: The CRISTA experiment provided global measurements of atmospheric trace gases in the stratosphere and upper troposphere during its second mission in August 1997. A new data product has recently been developed, yielding water vapor mixing ratios around the tropopause. The high data density of CRISTA makes an efficient assimilation of the water vapor field (by means of the NCAR ROSE CTM) possible. From these data turbulent trace gas fluxes upsilon'chi' are derived. The global distribution of the H2O fluxes is found to be highly structured at a given pressure level. Zonal means of fluxes indicate transport barriers at the equator and near the tropopause. This is compared to effective diffusivities of P. Haynes and E. Shuckburgh [J. Geophys. Res. 105 (2000) 22795] and general agreement is obtained. There is one important discrepancy, though: the effective diffusivities show a transequatorial "bridge" at about 350 K potential temperature (about 12 km), a "bridge" which is also seen in the CRISTA water vapor data, but at a considerably higher altitude. This finding is confirmed by ozone data from CRISTA and from UARS. (C) 2003 COSPAR. Published by Elsevier Ltd. All rights reserved.

Keyword(s): S ; water vapor (auto) ; tropopause (auto) ; turbulent flux (auto) ; transport barriers (auto) ; middle atmosphere dynamics (auto) ; ozone (auto) ; CRISTA (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Stratosphäre (ICG-I)

Research Program(s):

1. Chemie und Dynamik der Geo-Biosphäre (U01)

Appears in the scientific report 2004

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