Abstract : 1B.10
Scalar transport over forested hills

Andrew Ross
University of Leeds

Transport of scalars from forests is of significant interest for a variety of reasons. Forests represent an important sink of CO2 from the atmosphere. Measuring and quantifying these CO2 fluxes is an important part of improving our estimation of future trends in CO2 concentrations. Similarly, forests may also alter surface moisture fluxes and be an important source of other trace gases.

Many forested regions are also hilly or mountainous. Recent theoretical and modelling results have shown a significant impact of interactions between forests and the boundary layer over complex terrain. This poster investigates the effect of these flow interactions on scalar transport through a series of idealised numerical simulations of flow over a forested hill. Enhanced flow into and out of the forest canopy and increased flow separation lead to significant variations in the concentration of scalars across the hill. In the case of CO2, where the sink term depends on the local concentration, this can lead to differences is the total uptake by the forest.