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000154949 0247_ $$2doi$$a10.5194/gmdd-7-5087-2014
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000154949 1001_ $$0P:(DE-HGF)0$$aPommrich, R.$$b0$$eCorresponding author
000154949 245__ $$aTropical troposphere to stratosphere transport of carbon monoxide and long-lived trace species in the Chemical Lagrangian Model of the Stratosphere (CLaMS)
000154949 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2014
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000154949 520__ $$aVariations in the mixing ratio of trace gases of tropospheric origin entering the stratosphere in the tropics are of interest for assessing both troposphere to stratosphere transport fluxes in the tropics and the impact of these transport fluxes on the composition of the tropical lower stratosphere. Anomaly patterns of carbon monoxide (CO) and long-lived tracers in the lower tropical stratosphere allow conclusions about the rate and the variability of tropical upwelling to be drawn. Here, we present a simplified chemistry scheme for the Chemical Lagrangian Model of the Stratosphere (CLaMS) for the simulation, at comparatively low numerical cost, of CO, ozone, and long-lived trace substances (CH4, N2O, CCl3F (CFC-11), CCl2F2 (CFC-12), and CO2) in the lower tropical stratosphere. For the long-lived trace substances, the boundary conditions at the surface are prescribed based on ground-based measurements in the lowest model level. The boundary condition for CO in the free troposphere is deduced from MOPITT measurements (at ≈ 700–200 hPa). Due to the lack of a specific representation of mixing and convective uplift in the troposphere in this model version, enhanced CO values, in particular those resulting from convective outflow are underestimated. However, in the tropical tropopause layer and the lower tropical stratosphere, there is relatively good agreement of simulated CO with in-situ measurements (with the exception of the TROCCINOX campaign, where CO in the simulation is biased low ≈ 10–20 ppbv). Further, the model results are of sufficient quality to describe large scale anomaly patterns of CO in the lower stratosphere. In particular, the zonally averaged tropical CO anomaly patterns (the so called "tape recorder" patterns) simulated by this model version of CLaMS are in good agreement with observations. The simulations show a too rapid upwelling compared to observations as a consequence of the overestimated vertical velocities in the ERA-interim reanalysis data set. Moreover, the simulated tropical anomaly patterns of N2O are in good agreement with observations. In the simulations, anomaly patterns for CH4 and CFC-11 were found to be consistent with those of N2O; for all long-lived tracers, positive anomalies are simulated because of the enhanced tropical upwelling in the easterly phase of the quasi-biennial oscillation.
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000154949 7001_ $$0P:(DE-Juel1)129138$$aMüller, Rolf$$b1
000154949 7001_ $$0P:(DE-Juel1)129122$$aGrooß, J.-U.$$b2
000154949 7001_ $$0P:(DE-Juel1)129130$$aKonopka, P.$$b3
000154949 7001_ $$0P:(DE-Juel1)129141$$aPloeger, F.$$b4
000154949 7001_ $$0P:(DE-Juel1)129164$$aVogel, B.$$b5
000154949 7001_ $$0P:(DE-Juel1)156119$$aTao, M.$$b6
000154949 7001_ $$0P:(DE-HGF)0$$aHoppe, C. M.$$b7
000154949 7001_ $$0P:(DE-Juel1)129123$$aGünther, G.$$b8
000154949 7001_ $$0P:(DE-Juel1)129155$$aSpelten, N.$$b9
000154949 7001_ $$0P:(DE-Juel1)129125$$aHoffmann, L.$$b10
000154949 7001_ $$0P:(DE-HGF)0$$aPumphrey, H.-C.$$b11
000154949 7001_ $$0P:(DE-HGF)0$$aViciani, S.$$b12
000154949 7001_ $$0P:(DE-HGF)0$$aD'Amato, F.$$b13
000154949 7001_ $$0P:(DE-HGF)0$$aVolk, C. M.$$b14
000154949 7001_ $$0P:(DE-HGF)0$$aHoor, P.$$b15
000154949 7001_ $$0P:(DE-HGF)0$$aSchlager, H.$$b16
000154949 7001_ $$0P:(DE-Juel1)129145$$aRiese, M.$$b17
000154949 773__ $$0PERI:(DE-600)2456729-2$$a10.5194/gmdd-7-5087-2014$$gVol. 7, no. 4, p. 5087 - 5139$$n4$$p5087 - 5139$$tGeoscientific model development discussions$$v7$$x1991-962X$$y2014
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