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In this paper, we describe an analytical approach to the approximation of the nucleation rate of cloud condensation nuclei (CCN) in an updraught. This approach is developed as a subgrid parametrization for numerical models whose vertical grid structure prohibits the resolution of supersaturation and thence CCN activation.The method used is a simple extension to the upper bound approximation of Twomey...
Airborne cesium isotopes (134Cs and 137Cs) released during the Fukushima nuclear accident were transported all around the world attached to particles and reached France about 12days after the first explosion. Concentration of cesium isotopes in cloud water sampled at the summit of the Puy de Dôme mountain (1465ma.s.l.) increased by a factor of at least 40. During the following weeks, the concentrations...
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