Interaction of radiation fog with tall vegetation

A one-dimensional radiation fog model is presented. It is coupled with a se cond model to include the effects of tall vegetation. The fog model describ es in detail the dynamics, thermodynamics, and microphysical structure of a fog, as well as the interactions with the atmospheric radiative transfer. A two-dimensional joint size distribution for the aerosol particles and act ivated fog droplets is used, the activation of aerosol particles is explici tly modeled. The implications of the presence of tall vegetation on the state of the atm osphere and on the evolution of radiation fog are stated. It is shown that the existence of tall vegetation impedes the evolution of radiation fog. Th e life cycle of radiation fog is discussed. The input of fog water and asso ciated aerosol particles onto the vegetation surfaces via fog water interce ption processes is assessed. (C) 1999 Elsevier Science Ltd. All rights rese rved.