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European stratospheric monitoring stations in the Arctic II

Cel

Changes of the composition of the Arctic stratosphere will be observed by a network of stations and determined by performing long-term measurements, assuring instrumental quality standards, analysing collected data sets, performing case studies, and stratospheric aerosol and chemical trajectory modelling. Collected data will be shared via European and international data banks. The objectives of this project are to:
- continue the investigation of chemical and dynamical processes in the lower Arctic stratosphere within the European Stratospheric Monitoring Stations (ESMOS) network
- perform modelling studies to investigate the processes controlling the ozone loss
- determine the spatio-temporal extend of chemical perturbations in the lower and lowest part of the stratosphere, where air can be transported easily to mid latitudes
- assess latitudinal trends in ozone and related trace species - establish an Arctic network of backscatter sonde and aerosol lidar stations to determine the extend of the occurrence of Polar Stratospheric Clouds and their formation processes
- contribute to the observation of the solar UV radiation with high latitude stations.

This proposal consists of activities, which will be carried out continuously during the whole project period and
others, which are limited in time. The later ones are the intercomparison campaigns and the intensive
measurement campaigns at the observation sites in the Arctic. These campaigns concentrate on the polar winter
and spring, when ozone depletion is strongest and Polar Stratospheric Clouds occur.
For the interpretation of the extensive set of species measured at the stations, chemical modelling will be
performed to investigate the processes, which determine the chemical composition measured. Case studies for
events which display special features like fast ozone reductions, or which are set up by the most complete
measurements will be performed. They will also allow to determine the spatio-temporal extend of chemical
perturbations which are caused by PSC-events. Such case studies will also be performed on the extensive data
sets collected during the last years. By increasing the chlorine levels in the model corresponding to the expected
increase following the CFC emissions, future ozone depletion might be predicted. Investigations of the vortex
structure using our set of stations as well as those of other European funded activities, together with
meteorological data made available within data banks at NILU, will be performed in order to assess the degree
and mechanism to which in-vortex ozone depletion is linked to ozone depletion at middle latitudes.
Quality control of the data will be performed in two steps. First, all measurements will be checked by the
respective PIs and some instrumental techniques will be validated on site. This includes a FTIR intercomparison
at Thule and a microwave radiometer intercomparison at Ny-Elesund. Secondly, the self-consistency of all data
sets for each of the stations involved will be secured. Work here will include the cooperation with the other
ESMOS/Alps and NDSC stations in order to develop standards applicable for all of them and all measured
species. Consistency will be achieved by the intercomparison of measured data of one species obtained by
different methods (including satellite data e.g. from GOME, which can act as a "travelling standard"), as well
as by comparing (e.g. with the help of chemical models) the data of chemical species, which are related to each
other. Radiation measurements in the UV-B range will be also performed and analysed at Thule, Sodankyld and
Reykjavik.

Zaproszenie do składania wniosków

Data not available

System finansowania

CSC - Cost-sharing contracts

Koordynator

ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH
Wkład UE
Brak danych
Adres
Telegraphenberg 43 A
14473 GROSS GLIENICKE POTSDAM
Niemcy

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Uczestnicy (7)