Studying atmospheric transport through Lagrangian models

Lagrangian Transport Through Surfaces in Compressible Flows

A material-based, i.e., Lagrangian, methodology for exact integration of flux by volume-preserving flows through a surface has been developed recently in [Karrasch, SIAM J. Appl. Math., 76 (2016), pp. 1178–1190]. In the present paper, we first generalize this framework to general compressible flows, thereby solving the donating region problem in full generality. Second, we demonstrate the effic...

Subdiffusion and Superdiffusion in Lagrangian Stochastic Models of Oceanic Transport

To better understand the capacity of Lagrangian Stochastic Models to simulate superdiffusive and subdiffusive tracer motion in oceanic turbulence, we examine their performance on a simple class of model velocity fields which support subdiffusive or superdiffusive regimes of tracer transport associated to power-law regions of the Lagrangian power spectrum. We focus on how well the Lagrangian Sto...

Lagrangian transport modelling for CO2 using two different biosphere models

In this work, the performance of the Framework for Atmosphere-Canopy Exchange Modelling (FACEM: Pieterse et al., 2007) coupled to a Lagrangian atmospheric transport model is evaluated for carbon dioxide. Before incorporating FACEM into the La-grangian COMET model (Vermeulen et al., 2006), its performance for the European 5 domain is compared with the Simple Biosphere model (SiB3: Sellers et al....

Studying Atmospheric Chemistry with MCMC

A model describing chemical reactions in the stratosphere ([1]) is studied with MCMC methods. The model is a large ODE system consisting of 33 components, roughly 150 reactions and 150 reaction rate parameters. Thus, it is a good case study for adaptive MCMC methods designed for high-dimensional problems. In this case, the Delayed Rejection Adaptive Metropolis (DRAM, [2]) is succesfully applied...

Studying State Effectiveness in Africa through Informal Transport Politics