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Simulation of Age-of-Air with the Global Climate Model EMAC-ATTILA

Brinkop, Sabine and Jöckel, Patrick (2019) Simulation of Age-of-Air with the Global Climate Model EMAC-ATTILA. DACH 2019, 18 Mar - 22 Mar 2019, Garmisch-Partenkirchen, Germany.

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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 a new submodel to calculate the mixing of compounds in Lagrangian representation. We further use a new diagnostic tool to calculate on-line vertical mass-fluxes through the tropopause level. We performed two climate simulations in free-running mode with prescribed sea surface temperatures with EMAC-ATTILA in T42L47MA resolution from 1950 to 2010, one with the diabatic and one with the kinematic vertical velocity. Mean age-of-air, the transit time of air parcels in the stratosphere, is a common metric to quantify the overall capabilities of a global model to simulate stratospheric transport. It is calculated from an inert tracer with linearly increasing emissions at the surface. Our simulated age-of-air distribution with the diabatic vertical velocity appears more in accordance with observations, whereas the simulation with the (standard) kinematic vertical velocity shows a too low mean age-of-air. We will show age spectra for different regions and their local trends in the stratosphere. The stratosphere-troposphere exchange is characterized by upward mass fluxes in the tropics and downward mass fluxes in the extra-tropics. The simulation with diabatic vertical velocity captures these typical features with a net upward flux in the tropics between 30S and 30N and a net downward flux from 40 to 90 north and south. However, with the kinematic vertical velocity, the mass transport unfortunately appears rather noisy.

Item URL in elib:https://elib.dlr.de/127625/
Document Type:Conference or Workshop Item (Poster)
Additional Information:Dieser Eintrag enthält den Abstract der Präsentation und das präsentierte Poster
Title:Simulation of Age-of-Air with the Global Climate Model EMAC-ATTILA
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Brinkop, SabineDLR, IPAhttps://orcid.org/0000-0003-3167-203X
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Date:18 March 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Lagrangian tracer transport, age of air spectra, diabatic vertical velocity, stratospheric transport
Event Title:DACH 2019
Event Location:Garmisch-Partenkirchen, Germany
Event Type:international Conference
Event Dates:18 Mar - 22 Mar 2019
Organizer:DMG, SGM, ÖGM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Brinkop, Dr. Sabine
Deposited On:05 Jun 2019 16:20
Last Modified:31 Jul 2019 20:25

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