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Influence of stratosphere-troposphere exchange in a changing climate on atmospheric transport and oxidation capacity

Objective

Problems to be solved
STACCATO is a comprehensive study of stratosphere-troposphere exchange (STE) processes and their effect on atmospheric chemistry. STE is a key factor controlling the budget of ozone, water vapour and other substances in both the troposphere and lower stratosphere. Earlier studies of STE have concentrated primarily on the flux of air or trace constituents across the tropopause alone. Shallow exchange events are indeed partially reversible in nature and only produce compositional changes in the tropopause region. However, deep STE events are largely irreversible and have a highly significant and lasting impact on atmospheric chemistry through a substantial body of the atmosphere, even down to the earth's surface. Up until now, the importance of STE for the ozone budget relative to photochemical ozone formation from natural and anthropogenic precursor emissions, including those from aircraft, has remained uncertain. A comprehensive description of STE, which STACCATO seeks to provide, is thus a vital component for understanding the chemical composition of the atmosphere and its consequences.
Scientific objectives and approach
STACCATO is undertaking a first detailed investigation of STE mixing of stratospheric and tropospheric air. Meteorological processes under investigation include the creation of fine-scale structures by chaotic advection, radiative decay of tracer filaments and mixing through turbulence in the free troposphere. The non-linear effect of this mixing on chemical processes is addressed with a box model as well as with a global model. The impact of STE on the oxidizing capacity of the troposphere, relative to other factors, is examined with two global chemistry models coupled to climate models. The fate of aircraft emissions is being addressed using passive tracer simulations and including these in the chemistry models. A new three-dimensional Lagrangian perspective of STE, focussing on deep exchange events, is being developed. The variability and recent trends of STE is being assessed, based on very high quality meteorological re-analysis data. Potential future changes to STE significance are being computed under scenarios of climate change obtained from simulations with two climate models. A major comparison of seven methods and models used to calculate STE is being carried out to find strengths and weaknesses of each approach and to identify reasons for discrepancies. A measurement dataset is being created to validate model results and to provide an independent estimate of the strength of STE. This includes the first long-term monitoring of two radio nuclides, beryllium-7 and beryllium-10.
Expected Impacts
Provision of an observational estimate of the strength of STE based on two years of radio nuclide measurements. Analysis of the strength of STE and its variability during the last 15 years, based on Lagrangian models set up on meteorological re-analyses. Study of the possible changes in STE in a future climate. Assessment of the importance of STE for atmospheric chemistry relative to other factors. Improved knowledge of the role of mixing.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

TECHNICAL UNIVERSITY OF MUNICH
Address
Am Hochanger 13
85 354 Freising
Germany

Participants (10)

ARISTOTLE UNIVERSITY OF THESSALONIKI
Greece
Address
Aristotle University Of Thessaloniki
54006 Thessalonki
MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Bundesstra¯e 55
20146 Hamburg
NATIONAL TECHNICAL UNIVERSITY OF ATHENS
Greece
Address
9,Heroon Polytechniou 9
15780 Athens
ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE
Netherlands
Address
10,Wilhelminalaan 10
3730 AE De Bilt
SECRETARY OF STATE FOR DEFENCE - MINISTRY OF DEFENCE
United Kingdom
Address
London Road, Sutton House Room Sg/12
RG12 2SZ Bracknell
SWISS FEDERAL INSTITUTE OF TECHNOLOGY ZUERICH
Switzerland
Address
101,Hoenggerberg
8093 Zurich
UNIVERSITAET FUER BODENKULTUR WIEN
Austria
Address
18,Turkenschanzstrasse 18
1180 Wien
UNIVERSITY OF BERNE
Switzerland
Address
3,Freiestrasse 3
3012 Bern
UNIVERSITY OF VIENNA
Austria
Address
Währinger Strasse 17
1090 Wien
UTRECHT UNIVERSITY
Netherlands
Address
5,Princetonplein 5
3584 CC Utrecht