Mesoscale influence on long-range transport — evidence from ETEX modelling and observations |
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Authors: | Jens Havskov Sørensen Alix Rasmussen Thomas Ellermann Erik Lyck |
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Institution: | a1Danish Meteorological Institute (DMI), Meteorological Research Division, Lyngbyvej 100, DK-2100 Copenhagen Ø, Denmark;a2National Environmental Research Institute (NERI), Department of Atmospheric Environment, Frederiksborgvej 399, DK-4000 Roskilde, Denmark |
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Abstract: | During the first European Tracer Experiment (ETEX) tracer gas was released from a site in Brittany, France, and subsequently observed over a range of 2000 km. Hourly measurements were taken at the National Environmental Research Institute (NERI) located at Risø, Denmark, using two measurement techniques. At this location, the observed concentration time series shows a double-peak structure occurring between two and three days after the release. By using the Danish Emergency Response Model of the Atmosphere (DERMA), which is developed at the Danish Meteorological Institute (DMI), simulations of the dispersion of the tracer gas have been performed. Using numerical weather-prediction data from the European Centre for Medium-Range Weather Forecast (ECMWF) by DERMA, the arrival time of the tracer is quite well predicted, so also is the duration of the passage of the plume, but the double-peak structure is not reproduced. However, using higher-resolution data from the DMI version of the HIgh Resolution Limited Area Model (DMI-HIRLAM), DERMA reproduces the observed structure very well. The double-peak structure is caused by the influence of a mesoscale anti-cyclonic eddy on the tracer gas plume about one day earlier. |
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Keywords: | Long-range transport model tracer gas experiment mesoscale eddy ETEX HIRLAM |
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