The aim of this paper is to address computational aspects of the total energy singular vector analysis of atmospheric chemical transport models. We discuss the symmetry of the tangent-linear/adjoint operator for stiff systems. Results for a 3D simulation with real data reveal that the total energy singular vectors depend on the target domain, simulation window, chemical reactions, and meteorological data.
The singular vectors of a chemical transport model are the directions of maximum perturbation growth over a finite time interval. They have proved useful for the estimation of error growth, the initialization of ensemble forecasts, and the optimal placement of adaptive observatio
An evaluation has been made of a number of contrasting atmospheric chemical transport models, of varying complexity, applied to estimate sulphur and nitrogen deposition in the UK. The models were evaluated by comparison with annually averaged measurements of gas, aerosol and prec
The task of providing an optimal analysis of the state of the atmosphere requires the development of dynamic data-driven systems (das) that efficiently integrate the observational data and the models. In this paper we discuss fundamental aspects of nonlinear ensemble data assimil
We describe and evaluate a six-moment aerosol microphysical module, 6M, designed for implementation in atmospheric chemical transport models (CTMs). 6M is based upon the Quadrature Method Of Moments (QMOM) [McGraw, 1997] and the Multiple Isomomental Distribution Aerosol Surrogate
Numerical modeling of global atmospheric chemical dynamics presents an enormous challenge, associated with simulating hundreds of chemical species with time scales varying from milliseconds to years. Here we present an algorithm that provides a significant reduction in computatio
Agricultural residues burning as a means of land preparation commonly practiced in many Southeast Asian countries causes significant deterioration ambient air quality and public health. In this study, WRF-CMAQ Atmospheric Chemical Transport Model was used to conduct year-round si