The field campaigns of the European Tracer Experiment (ETEX)

Nodop, Katrin; Connolly, Ronan; Girardi, F.

doi:10.1016/s1352-2310(98)00190-3

Cited by 79 publications

(70 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The model predicted that a reasonable amount of PCMH on the order of 500 kg would be needed to achieve the long range experiment goal over eastern China, South Korea, and Japan. This value is similar to the amount released during the ETEX second experiment 5 .…”

Section: -Hrsupporting

confidence: 81%

Preliminary Report: Results of Computed Tracer Concentrations over Eastern China, South Korea, and Japan for 01 March to 30 May 2007 Daily Simulated Releases from Taiyuan, China

Vogt¹

2007

View full text Add to dashboard Cite

Section: -Hrsupporting

confidence: 81%

Preliminary Report: Results of Computed Tracer Concentrations over Eastern China, South Korea, and Japan for 01 March to 30 May 2007 Daily Simulated Releases from Taiyuan, China

Vogt¹

2007

View full text Add to dashboard Cite

“…During off-line runs advection was updated with relevant meteorological fields every 0.5, 1, 2, 4, 6, 12 and 24 h (using constant input in between updates). Simulations of the ETEX-1 (Nodop, 1998) release were conducted and comparison with observations was used to calculate statistical quantities at specific stations. As the off-line coupling interval increase, so does the error, which becomes of considerable size when the coupling interval is between two and four hours (Fig.…”

Section: Results Of On-line Modellingmentioning

confidence: 99%

ENVIRO-HIRLAM: on-line coupled modelling of urban meteorology and air pollution

et al. 2008

View full text Add to dashboard Cite

Abstract. The strategy of new generation integrated Meso-Meteorological (MetM) and Atmospheric Chemical Transport (ACT) models for predicting atmospheric composition, meteorology and climate change is discussed for the Enviro-HIRLAM (HIgh Resolution Limited Area Model) integrated system. Current progress in the Enviro-HIRLAM system development and its urban on-line coupled modelling applications is considered. Results of several sensitivity studies of the urban effects (urban albedo and roughness, anthropogenic heat flux, heat island, and urban aerosols) on meteorology and air pollution at different scales are presented. Several sensitivity tests of the off-line versus on-line coupling of MetM and ACT models in Enviro-HIRLAM as well as their verification versus the ETEX experiment are considered and results are discussed.

show abstract

“…The release rate was meant constant over twelve hours. The subsequent plume was monitored over Europe by 168 WMO stations (Nodop et al, 1998). A few years after the Chernobyl accident, its purpose was to 1 Bocquet,M.…”

Section: Application To a Real Dispersion Event: Etex-imentioning

confidence: 99%

Inverse modelling of atmospheric tracers: non-Gaussian methods and second-order sensitivity analysis

Bocquet

2008

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

Abstract. For a start, recent techniques devoted to the reconstruction of sources of an atmospheric tracer at continental scale are introduced. A first method is based on the principle of maximum entropy on the mean and is briefly reviewed here. A second approach, which has not been applied in this field yet, is based on an exact Bayesian approach, through a maximum a posteriori estimator. The methods share common grounds, and both perform equally well in practice. When specific prior hypotheses on the sources are taken into account such as positivity, or boundedness, both methods lead to purposefully devised cost-functions. These cost-functions are not necessarily quadratic because the underlying assumptions are not Gaussian. As a consequence, several mathematical tools developed in data assimilation on the basis of quadratic cost-functions in order to establish a posteriori analysis, need to be extended to this nonGaussian framework. Concomitantly, the second-order sensitivity analysis needs to be adapted, as well as the computations of the averaging kernels of the source and the errors obtained in the reconstruction. All of these developments are applied to a real case of tracer dispersion: the European Tracer Experiment [ETEX]. Comparisons are made between a least squares cost function (similar to the so-called 4D-Var) approach and a cost-function which is not based on Gaussian hypotheses. Besides, the information content of the observations which is used in the reconstruction is computed and studied on the application case. A connection with the degrees of freedom for signal is also established. As a byproduct of these methodological developments, conclusions are drawn on the information content of the ETEX dataset as seen from the inverse modelling point of view.

show abstract

The field campaigns of the European Tracer Experiment (ETEX)

Cited by 79 publications

References 6 publications

Preliminary Report: Results of Computed Tracer Concentrations over Eastern China, South Korea, and Japan for 01 March to 30 May 2007 Daily Simulated Releases from Taiyuan, China

Preliminary Report: Results of Computed Tracer Concentrations over Eastern China, South Korea, and Japan for 01 March to 30 May 2007 Daily Simulated Releases from Taiyuan, China

ENVIRO-HIRLAM: on-line coupled modelling of urban meteorology and air pollution

Inverse modelling of atmospheric tracers: non-Gaussian methods and second-order sensitivity analysis

Contact Info

Product

Resources

About