CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultados aprovechables
SSummary
LA/CNRS developed: (1) a prototype for automatic CO measurement at low concentration, based on a commercial IR analyzer and increasing the sensitivity by a factor of 20; (2) an automatic system for aerosol counting, based on a commercial laser absorption detector; a new Data Acquisition System (mini computer, Arinc card, interfaces) in order to improve performances of existing system.
FZJ developed and built a completely new NOy instrument, on the basis of a small chemiluminescence detector and a catalytic converter.
These systems were tested in the laboratory and in flight conditions during test-flights, confirming that their performances were convenient for further installation and operation on board the commercial MOZAIC aircraft.
A sensitivity 5 ppbv for an integration time of 15 sec was reached by CO and the feasibility of aerosol measurements, using a reverse flow inlet was demonstrated.
Summary: The existence of ozone-rich transients in the tropical and subtropical high troposphere has been discovered from MOZAIC data obtained during flights crossing the Equator. Several explanations have been proposed, but this strongly suggests that the input of stratospheric air into the troposphere can take place in the tropics. (LA/CNRS)
The existence and the seasonal variability of the Atlantic subtropical potential vorticity barrier, controlling the stratosphere-troposphere exchanges between the lowermost extratropical stratosphere and the upper equatorial troposphere has been evidenced and documented.
The mean stratosphere/troposphere exchange in the region of the polar jet was analyzed in a statistic way using MOZAIC water vapour and ozone measurements.
MOZAIC observations have shown that in the upper troposphere the specific humidity in the mid-latitudes and subtropics exhibit a pronounced biannual cycle which is strongly coupled to the seasonal cycle of the temperature.
An investigation of low ozone concentrations and conditions when they occur was started by MPI. Almost all episodes were found in the tropics, with half of events occurring just after a peak in the ozone concentration and most of them being likely to be associated with local convection.
Summary:
Over 5 years of in situ observations sampled from 5 Airbus aircraft are available in the MOZAIC database. Atmospheric parameters available are: ozone and water vapour concentrations, pressure, temperature and wind. Measurement frequency of 1 per 4 second provides resolutions of 20m and 1km in the ascent/descent and cruise portions of the flight respectively. On average, 6 flights per day are available. The flights documented are round trip flights from Europe (Paris, Frankfurt a.M., Brussels, or Vienna) to North and South America, Africa, South and South West Asia. MOZAIC data are calibrated and validated. (M-F)
Also available are data averaged over boxes of 150m altitude and 1 minute time. Meteorological data are calculated from weather analyses. For the characterization of measurements made during ascent or descent, backward trajectories of air parcels at 6 standard pressure levels and for a set of 6 airports visited by the MOZAIC aircraft are available once per day. (M-F).
Geostationary satellite images are available daily over the America/Atlantic/Africa/Europe domain. (M-F) The database describes the upper tropospheric chemistry, which will allow more confident predictions of future climatic changes.
The MOZAIC website was transferred to the server of Laboratoire d'Aerologie (now http://www.aero.obsmip.fr/mozaic/).
Summary: A global comparison between 5 global 3D chemistry and transport models results and the MOZAIC data was performed by UCAM, MPI, and LA/CNRS. Models generally showed good agreement with the data in regions which have been previously well documented and where the meteorology is well understood or captured by meteorological models. However, in the upper and lower stratosphere, models fail to capture the sharp gradients across the tropopause and from the sub-tropics to the tropics.
The Oslo CTM2 was compared to MOZAIC ozone in the UT/LS and gave results comparable with higher resolution models. A somewhat overestimation was found for ozone in the northern hemisphere spring.
A simple ozone tracer with a parameterization of the chemistry has been used in the TOMCAT model to assess the upper troposphere/lower stratosphere representation of the model. Results showed that the best version of TOMCAT which leads to the best agreement with MOZAIC ozone measurements includes a top-boundary prescribed at top of the model above 60 hPa with realistic values at mid-latitudes, high horizontal resolution and at least a simple representation of the chemistry. (UCAM)
In order to better evaluate the model performances, a method was elaborated that gives a quick insight into where and when the main differences occur between modeled and measured concentration frequency distributions.
Summary:
From data collected between 09/1994 and 08/1998 at cruise altitude, accurate O3 and H2O climatologies at 9-12 km altitude were generated. The stratospheric components were separated using a combination of O3 and PV thresholds, and their variations were interpreted. (LA/CNRS)
From data collected during ascents and descents between 09/1994 and 04/1999, accurate O3 and H2O climatologies between 0 and 12 km altitude were generated for various cities (Caracas, Frankfurt, Paris, Madras, Johannesburg, Osaka, Sao Paulo, Rio). (LA/CNRS)
The two year O3 climatology 91994-96) from data collected between 0 and 12 km altitude was compared to measurements at 8 stations of the Ozone Sounding Network (Hohenpeissenberg, Wallops Island, Tateno, Palestine, Pretoria, Goose Bay, Biscarosse, Poona). Climatologies were found in good agreement, in the range of uncertainties of the 2 methods. (LA/CRNS)
Buscando datos de OpenAIRE...
Se ha producido un error en la búsqueda de datos de OpenAIRE
No hay resultados disponibles