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000030239 084__ $$2WoS$$aAstronomy & Astrophysics
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000030239 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000030239 1001_ $$0P:(DE-HGF)0$$aSchaeler, B.$$b0
000030239 245__ $$aA case study of trace gas transports near the tropopause
000030239 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2004
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000030239 440_0 $$09884$$aAdvances in Space Research$$v33$$x0273-1177$$y7
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000030239 520__ $$aThe CRISTA experiment provided global measurements of atmospheric trace gases in the stratosphere and upper troposphere during its second mission in August 1997. A new data product has recently been developed, yielding water vapor mixing ratios around the tropopause. The high data density of CRISTA makes an efficient assimilation of the water vapor field (by means of the NCAR ROSE CTM) possible. From these data turbulent trace gas fluxes upsilon'chi' are derived. The global distribution of the H2O fluxes is found to be highly structured at a given pressure level. Zonal means of fluxes indicate transport barriers at the equator and near the tropopause. This is compared to effective diffusivities of P. Haynes and E. Shuckburgh [J. Geophys. Res. 105 (2000) 22795] and general agreement is obtained. There is one important discrepancy, though: the effective diffusivities show a transequatorial "bridge" at about 350 K potential temperature (about 12 km), a "bridge" which is also seen in the CRISTA water vapor data, but at a considerably higher altitude. This finding is confirmed by ozone data from CRISTA and from UARS. (C) 2003 COSPAR. Published by Elsevier Ltd. All rights reserved.
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000030239 65320 $$2Author$$awater vapor
000030239 65320 $$2Author$$atropopause
000030239 65320 $$2Author$$aturbulent flux
000030239 65320 $$2Author$$atransport barriers
000030239 65320 $$2Author$$amiddle atmosphere dynamics
000030239 65320 $$2Author$$aozone
000030239 65320 $$2Author$$aCRISTA
000030239 7001_ $$0P:(DE-HGF)0$$aOffermann, D.$$b1
000030239 7001_ $$0P:(DE-HGF)0$$aHoffmann, L.$$b2
000030239 7001_ $$0P:(DE-Juel1)129145$$aRiese, M.$$b3$$uFZJ
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000030239 8567_ $$uhttp://dx.doi.org/10.1016/S0273-1177(03)00588-X
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