A case study in atmospheric lead pollution of Northern-German coastal regions

Transport and deposition of atmospheric lead over the coastal zone of Northern Germany are investigated. It is shown that marked differences in the impact of the ecologically valuable wadden sea areas can occur between summer and winter time. Due to the formation of sea breeze systems in summer the coastal zone is likely to be less stressed than in winter when the pollutant is confined to a shallow layer above ground. (orig.)10 refs.Available from TIB Hannover: RA 3251(98/E/13) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

IMAS - integrated modeling and analysis system - release 1.0

IMAS provides a Fortran 90 programming environment for the solution of control problems. It consists of an automatic differentiation tool for computer programs, based on the Fortran 90 overloading techniques. A program integrated in IMAS writes a record of all its operations, transparent to the user. An interpreter performs the tangent-linear or adjoint operations according to this record. IMAS further contains minimization algorithms for data assimilation and inverse modeling. (orig.)Available from TIB Hannover: RA 3251(96/E/28) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

A numerical model for simulating pollutant transport from a single point source

Special print from Atmos. Environ., A Gen. Topics (1991) v. 25(7) p. 1391-1401Available from TIB Hannover: RA 3251(91/E/37) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Variational soil moisture analysis from screen-level atmospheric parameters: application to a short-range weather forecast model

A variational analysis scheme for soil moisture in the domain of the operational regional weather forecast model (DM) of the Deutscher Wetterdienst (DWD), (German weather service), is investigated using analyzed fields of screen-level atmospheric temperatures and relative humidities in a five day period in March 1994. In order to reduce the computational load of the analysis a stand-alone model system consisting of the complete soil model plus a simplified description of processes in the atmospheric boundary layer has been designed. Radiative forcing and conditions at the top of the boundary layer are prescribed from a DM reference run during variation. Retrieved soil moisture values turn out to be considerably lower than in the operational reference run. The improved quality of the resulting sensible and latent heat fluxes can be assessed on the basis of better forecasts they imply. The analyzed soil moistures themselves are consistently very low and can be doubted to be realistic for this time of the year. They should be considered as being mere effective parameters to be tuned with respect to the specific soil model in order to provide correct lower boundary conditions for the atmosphere. Numerical experiments have been conducted in order to estimate the influence of possibly misspecified radiative forcing on the retrieved soil moisture fields. It is shown that moisture values being derived from observations of atmospheric relative humidity are much more stable than those derived from temperature observations. (orig.)9 refs.Available from TIB Hannover: RA 3251(97/E/36) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman