caa a22 4500 37887649X CHVBK 20180305123421.0 cr unu---uuuuu 161128e20030401xx s 000 0 eng 10.1515/156939603322663330 doi (NATIONALLICENCE)gruyter-10.1515/156939603322663330 Stochastic Lagrangian footprint calculations over a surface with an abrupt change of roughness height [Elektronische Daten] [O. Kurbanmuradov, A. Levykin, U. Rannik, K. Sabelfeld, T. Vesala] Forward and backward stochastic Lagrangian trajectory simulation methods are developed to calculate the footprint and cumulative footprint functions of concentration and fluxes in the case when the ground surface has an abrupt change of the roughness height. The statistical characteristics to the stochastic model are extracted numerically from a closure model we developed for the atmospheric boundary layer. The flux footprint function is perturbed in comparison with the footprint function for surface without change in properties. The perturbation depends on the observation level as well as roughness change and distance from the observation point. It is concluded that the footprint function for horizontally homogeneous surface, widely used in estimation of sufficient fetch for measurements, can be seriously biased in many cases of practical importance. Copyright 2003, Walter de Gruyter Kurbanmuradov O. Center for Phys. Math. Research, Turkmenian State University, Turkmenbashy av. 31, 744000 Ashgabad, Turkmenistan. aut Levykin A. Institute of Comput. Mathematics and Mathematical Geophysics,Russian Academy of Sciences, Lavrentieva str., 6 630090 Novosibirsk, Russia. aut Rannik U. Department of Physics, FIN-00014 University of Helsinki, Finland. aut Sabelfeld K. Institute of Comput. Mathematics and Mathematical Geophysics,Russian Academy of Sciences, Lavrentieva str., 6 630090 Novosibirsk, Russia. aut Vesala T. Department of Physics, FIN-00014 University of Helsinki, Finland. aut Monte Carlo Methods and Applications Walter de Gruyter 9/2(2003-04-01), 167-188 0929-9629 9:2<167 2003 9 mcma https://doi.org/10.1515/156939603322663330 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/156939603322663330 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kurbanmuradov O. Center for Phys. Math. Research, Turkmenian State University, Turkmenbashy av. 31, 744000 Ashgabad, Turkmenistan aut NATIONALLICENCE 700 1- Levykin A. Institute of Comput. Mathematics and Mathematical Geophysics,Russian Academy of Sciences, Lavrentieva str., 6 630090 Novosibirsk, Russia aut NATIONALLICENCE 700 1- Rannik U. Department of Physics, FIN-00014 University of Helsinki, Finland aut NATIONALLICENCE 700 1- Sabelfeld K. Institute of Comput. Mathematics and Mathematical Geophysics,Russian Academy of Sciences, Lavrentieva str., 6 630090 Novosibirsk, Russia aut NATIONALLICENCE 700 1- Vesala T. Department of Physics, FIN-00014 University of Helsinki, Finland aut NATIONALLICENCE 773 0- Monte Carlo Methods and Applications Walter de Gruyter 9/2(2003-04-01), 167-188 0929-9629 9:2<167 2003 9 mcma CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter