HYSPLIT modeling of Rn-222 Transport During the Year 1998 in Europe and in the Indian Ocean, Comparison with Continuous Measurements
Radon 222 is used as a tracer to evaluate and to probe atmospheric transport in the model HYSPLIT4 (HYbrid Single-Particle Lagrangian Integrated Trajectory, NOAA Air Ressources Laboratory). Rn-222 is a terrageneous radionuclide which is a decay product of Uranium., with a half-life of 3.8 d. Radon is an inert gas, so the only sink process for it is radioactive decay. We have simulated the atmospheric transport of this radionuclide during the year 1998 with a hybrid lagrangian particle code using NCEP reanalysed meteorological files with a 1ox1o spatial resolution and 6 hours time resolution. Sources of Radon are supposed null over oceans, uniform over continents (1 atom/cm2/s) between latitude 60oS and 60oN. This flux is reduced by a factor 3 between latitude 60°N and 70°N to take account freezing conditions. Synthetic concentrations of Radon are compared to continuous measurements at 6 stations in Northern Europe (Macehead, 9o54'W 53o20'N Ireland; Heidelberg 8o42'E 49o24'N, Schauinsland 7o55'E 47°55'N Zingst1 2o44'E 54o26'N Germany; Jungfraujochlon 7o59'E 47o33'N, Switzerland; Tver 32o55'E 56o28'N, Russia)and one in Indian Ocean. We have conducted intercomparison of numerical models HYSPLIT and LMDZ (Laboratoire de Météorologie Dynamique, Paris).
AGU Fall Meeting Abstracts
- Pub Date:
- December 2001
- 3300 METEOROLOGY AND ATMOSPHERIC DYNAMICS;
- 3319 General circulation;
- 3337 Numerical modeling and data assimilation