Objective
This project is intended to combine efforts of 2 INTAS Member States (Italy - UNIVAQ, Norway - Oslo University) and 2 Russian teams (Russian State Hydrometeorological Institute and Main Geophysical Observatory) in the theoretical studies of atmospheric ozone layer damages caused by human intervention. A three-year modelling effort is proposed to study the atmospheric effects of subsonic and supersonic aviation and man-made releases of chlorinated and brominated compounds using both 2-D and 3-D models. The overall goal of the project is development of the strategy of designing a 2-D model which will be as close as possible to the parent 3-D model.
The main objectives of the project are as follows:
- Deriving the two-dimensional parameters of large-scale zonally averaged transport from different 3-D models;
- Accounting for the longitudinal variations in temperature-dependent reaction rates, especially for heterogeneous processes both on the sulfate aerosol and Polar Stratispheric Clouds (PSCs) surfaces;
- Impementing convective transports in a 2-D model;
- Assessment of the effects of subsonic and supersonic aircraft using a 3-D model and compare this assessment to a 2-D model that has been constructed to be as similar as possible;
- Model predictions of the atmospheric ozone response to the man-made releases of trace gases based on WMO/UNEP scenarios.
For realization of the basic purposes of the project it is supposed to use developed in UNIVAQ (Italy) and OSLO University three-dimensional models of the troposphere and stratosphere for deriving on a uniform technique zonally averaged parameters of large-scale transport processes, convective processes and heterogeneous processes on the surfaces of PSCs and sulfate aerosol. The obtained parameters will then be used in four two- dimensional models of troposhere and stratosphere (UNIVAQ, OSLO, SUNY-SPB and MGO). The outcomes of two-dimensional simulations will be compared among themselves, to three-dimensional results and observations. By results of comparison conclusions about the best methods of deriving of zonally averaged parameters of large-scale dynamics, convection and account for temperature variations from a three-dimensional model will be made. The obtained thus parameterisations will be used in four two-dimensional models for long-term calculations of man-made impacts (aircraft and chlorofluorocarbons emissions) on atmospheric ozone.
Thus the three-dimensional models will be also used for realization of base estimations, and two-dimensional, using outputs of three- dimensional models for realization of greater number of the assessment scenarios.
During the Project it is expected to obtain the following results:
1. Development of the methology to derive a set of transport parameters (meridional circulation and resolved eddy mixing) from a 3-D GCM output requied in two-dimensional chemistry transport models that best represents parent 3-D model in terms of column ozone distribution;
2. Development of zonally averaged transport diagnostics that could be used for 3-D models so that their characteristics may be reasonably compared;
3. Conclusion about the best method of accounting for the longitudinal temperature variations in the calculation of temperature-dependent, gas-phase and heterogeneous reactions both on the surfaces of sulfate aerosol and Polar Stratospheric Clouds;
4. Incorporation of the convective transports in a 2-D model capable to account for zonal asymmetry of the convective processes on the base of comparison of various methods with 3-D results;
5. Diagnostics of the observed ozone changes on the base of 2-D model with input parameters from GCM;
6. Model predictions of the possible atmospheric ozone changes in future;
7. Assessment of subsonic and supersonic aircraft impact on the ozone layer obtained with the new type 2-D model.
Call for proposal
Data not availableFunding Scheme
Data not availableCoordinator
67010 Coppito, L'Aquila
Italy