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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-302
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-302
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 21 Jan 2019

Model description paper | 21 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

ATTILA 4.0: Lagrangian Advective and Convective Transport of Passive Tracers within the ECHAM5/MESSy (2.53.0) Chemistry Climate Model

Sabine Brinkop1,2 and Patrick Jöckel1 Sabine Brinkop and Patrick Jöckel
  • 1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82230 Wessling, Germany
  • 2Meteorologisches Institut der Universität München, 80333 München, Germany

Abstract. We have extended ATTILA (Atmospheric Tracer Transport in a LAgrangian model), a Lagrangian tracer transport scheme, which is on-line coupled to the global ECHAM/MESSy Atmospheric Chemistry (EMAC) Climate model, with a combination of newly developed and modified physical routines, and new diagnostic and infrastructure submodels. The new physical routines comprise a parametrisation for Lagrangian convection, a formulation of diabatic vertical velocity, and the new grid-point submodel LGTMIX to calculate the mixing of compounds in Lagrangian representation. The new infrastructure routines simplify the transformation between grid-point (GP) and Lagrangian (LG) space in a parallel computing environment. The new submodel LGVFLUX is a useful diagnostic tool to calculate on-line vertical mass-fluxes through horizontal surfaces. The submodel DRADON was extended to account for emissions and changes of 222Radon on Lagrangian parcels. To evaluate the new physical routines, two simulations in free-running mode with prescribed sea surface temperatures were performed with EMAC-ATTILA in T42L47MA resolution from 1950 to 2010. The results show an improvement of the tracer transport into and within the stratosphere, when the diabatic vertical velocity is used for vertical advection in ATTILA instead of the standard kinematic vertical velocity. Especially the age-of-air distribution is more in accordance with observations. The global tropospheric distribution of 222Radon, however, is simulated in agreement with available observations and with the results from EMAC in grid-space for both Lagrangian systems. Additional sensitivity studies reveal an effect of the inter-parcel mixing on the age-of-air in the tropopause region and the stratosphere, but no significant effect for the troposphere.

Sabine Brinkop and Patrick Jöckel
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Status: open (until 18 Mar 2019)
Status: open (until 18 Mar 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Sabine Brinkop and Patrick Jöckel
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Short summary
We have extended ATTILA (Atmospheric Tracer Transport in a LAgrangian model), a Lagrangian tracer transport scheme, which is on-line coupled to the global ECHAM/MESSy Atmospheric Chemistry (EMAC) Climate model, with a combination of newly developed and modified physical routines, and new diagnostic and infrastructure submodels. The results show an improvement of the tracer transport into and within the stratosphere due to the newly implemented diabatic vertical velocity.
We have extended ATTILA (Atmospheric Tracer Transport in a LAgrangian model), a Lagrangian...
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