Objective
The objectives are those of the Network for Detection of Stratospheric Change (NDSC); Investigation of the long term change of stratospheric constituents and establishment of a data base to be used for correction of possible drifts of satellite instruments.
The strategy is to continue existing long term measurements from a network of European ground-based UV-visible spectrometers at high and lower latitudes by means of collection and analysis of data and to provide an independent calibration of satellite sensors of the atmosphere. The research especially aims at a climatology of O3, NO2 columns and, where possible, OClO and BrO. The data base for the UV-visible region reaches back to 1987/88. Therefore trends and interannual variations will be discernible. The goals are to perform continuous observations to make the earliest possible identification of changes in the ozone layer and to discern the cause of the changes. The objectives include NDSC validation of instruments, vertical profiling of O3 and NO2, validation of retrieval algorithms and intercomparison of BrO and OClO column measurements with the purpose of including these in the NDSC data base. This data base will be used to test and improve multidimensional stratospheric chemical and dynamical models, thereby enhancing confidence in the predictive and assessment capabilities of these models.
Stratospheric measurements will be carried out throughout the project period by ground-based UV-visible
instruments. The unpredictable movements of the Arctic vortex required instruments at various locations. The
vortex position will be followed, to determine the location of stations relative to the vortex. Measurements will
be made at high and at lower latitudes. An important objective is to monitor the effect of air masses transported
from high to lower latitudes. The daytime (twilight) column densities of stratospheric trace gases are measured
by ground-based observations of sunlight scattered from the zenith sky. There will be automated instruments
(SAOZ) and non-commercial instruments operated in the spectral range from 300 to 700 nm.
The absorptions are due to the column of molecules absorbing along the slant path between the light source and
the observed. Before the weak atmospheric absorption bands are detectable, the much stronger solar Fraunhofer
structure must be removed. This is accomplished by dividing by a reference spectrum containing no other
molecular absorptions from the Earth's atmosphere.
Preliminary data including vertical columns of O3, NO2, OClO and BrO processes automatically in real time
will be made available at the NILU data centre throughout the project period weekly. Final data from re processed spectra will be sent to the data centre later (1-3 months delay depending on station). Experimental
results including interannual variability and trends will be published in the international scientific literature. The
instruments and software are already operational, and therefore stratospheric observations and modelling
activities will begin with the contract without delay.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
- natural sciencescomputer and information sciencessoftware
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringsatellite technology
- natural sciencesearth and related environmental sciencesenvironmental sciencesozone depletion
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensors
- natural sciencesearth and related environmental sciencesatmospheric sciencesclimatology
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Call for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
2100 KOEPENHAGEN
Denmark