Description: Das Projekt "Messungen und Modellierung von Ozon und aktiven Spezies von Fruehjahr bis Herbst - SAMMOA" wird vom Umweltbundesamt gefördert und von Forschungszentrum Jülich GmbH, Institut für Chemie und Dynamik der Geosphäre durchgeführt. 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 light-weight balloon-borne instrumentation. Satellite observations complement these local, ground-based and in-situ measurements by allowing to characterise 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. Prime Contractor: Norwegian Institute for Air Research; Kjeller.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Jülich ? Stratosphärisches Ozon ? Ozon ? Ozonwert ? Geografische Koordinaten ? IR-Spektroskopie ? Lidar ? Meteorologie ? Satellitendaten ? UV-Strahlung ? Main ? Montrealer Protokoll ? Messtechnik ? Satellit ? Spurenelement ? Arktis ? Chemikalien ? Physikalisches Modell ? Stand der Technik ? Stratosphäre ? Studie ? Polargebiet ? Modellierung ? Europa ? Assimilation ? Jahreszeit ? In-Situ-Messung ? Messdaten ? Wirkungsmodell ? Verkehrsmodell ? Fernerkundung ? Ozonabbau ? Fischerei ? Forschungseinrichtung ? Stofftransport ? in situ ? Umweltschutz ? Geosphäre ? resources of the sea ? forecasting ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2000-02-25 - 2002-02-24
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