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Spring-to-autumn measurements and modellling of ozone and active species

Spring-to-autumn measurements and modellling of ozone and active species

Objective

Problems to be solved
There are still discrepancies between model prediction and observations of the year- round stratospheric ozone decline in mid and high latitudes. In summer, current models still severely overestimate ozone in the polar regions, and this appears as a major deficiency in our ability to model the complete ozone seasonal cycle. The springtime mid-latitude ozone depletion has not been satisfactorily modelled in a quantitative manner. This proposal hence aims at improving our understanding and modelling of ozone loss processes throughout spring and summer, in the northern mid and high latitudes.
Scientific objectives and approach
The main scientific objective is to acquire a quantitative understanding of:
(i) the mid-latitude ozone depletion accompanying the breakdown of the wintertime polar vortex, especially over Europe, and
ii) the Arctic summer ozone deficit and its linkage to midlatitudes.
The project relies on using an integrated approach combining ground-based and balloon-borne measurements, global satellite observations, as well as advanced chemical/dynamical modelling and data assimilation. Measurements of ozone, inert gases, or species actively involved in ozone chemistry, are made at three different stations in the Arctic throughout spring and summer. Observational techniques comprise ground-based lidar and infrared spectroscopic measurements, and lightweight balloon-borne instrumentation. Satellite observations complement these local, ground-based and in-site measurements by allowing characterising the global, evolving three-dimensional ozone distribution. The satellite data are globally integrated into a transport model through data assimilation. State-of-the-art numerical models are used to investigate the interaction of chemistry and mixing in the spring and summer stratosphere. These models are used to diagnose the ozone loss mechanisms and the overall transport of trace species in spring and summer. Correlative studies of the abundance of various trace species, either modelled or measured, allow to disentangle the effect of mixing from chemical sources and sinks.
Expected impacts
The information to be provided by the field campaigns and model studies during SAMMOA will improve the quantification of ozone loss in the stratosphere, a key science priority in support of the Montreal protocol. This project will particularly impact on understanding of ozone depletion in spring and summer, when it is most harmful. It is indeed in the summertime, that human exposure to UV radiation is largest in middle latitudes. Modelling improvements shall result in better assessment and prediction of the ozone trend and recovery in support of regulatory protocols.

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Coordinator

NORWEGIAN INSTITUTE FOR AIR RESEARCH

Address

Instituttveien 18
2027 Kjeller

Norway

Administrative Contact

Paal BERG (Mr)

Participants (9)

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ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH

Germany

DANISH METEOROLOGICAL INSTITUTE

Denmark

FORSCHUNGSZENTRUM JUELICH GMBH

Germany

ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE

Netherlands

SWEDISH INSTITUTE OF SPACE PHYSICS

Sweden

SWEDISH SPACE CORPORATION

Sweden

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD

United Kingdom

UNIVERSITY OF LEEDS

United Kingdom

University of Cambridge

United Kingdom

Project information

Grant agreement ID: EVK2-CT-1999-00049

  • Start date

    1 March 2000

  • End date

    28 February 2002

Funded under:

FP5-EESD

  • Overall budget:

    € 1 468 300

  • EU contribution

    € 999 300

Coordinated by:

NORWEGIAN INSTITUTE FOR AIR RESEARCH

Norway