I am looking at the impacts of canopy radiative transfer scheme on photolysis rates. For a given light intensity (e.g., W/m2) and compound of interest (e.g., ozone), the photolysis rate depends on how the light is distributed among wavelengths (the light spectrum) and directions (essentially, direct solar beam vs diffuse light).
The canopy RT scheme determines the vertical profile of the light spectrum within the plant canopy.
In a 1-D modeling context using a continuous leaf profile, attenuation of the direct solar beam by absorption and scattering by foliage elements is treated the same way in most schemes. Schemes differ in the way the diffuse light is treated, including:
The Atmospheric Chemistry and Canopy Exchange Simulation System (ACCESS)
I am working with Rick Saylor to improve his 1-D model for photochemistry in and above a plant canopy. Goals for this project include:
The presense of two warm cores in very intense tropical cyclones (TCs) has been noted in quite a few observational and modeling studies. Chanh Kieu proposed[footnote citation] that the development of an upper secondary warm core allows a TC to intensify beyond traditional theoretical limits of intensity (in terms of maximum tangential wind speed). The secondary warm core forms due to interaction of the TC with the lower stratosphere. Thus, a lower tropopause height might be expected to be associated with increased intensity through this mechanism.
This was the primary project of undergrads Madison Ferrara and Faith Groff during my time as a MS student. Instead of using numerical weather prediction (NWP) models or a theoretical framework to investigate the intensification through the DWC mechanism, this study looked for evidence of correlation between upper troposphere / lower stratosphere (UT/LS) characteristics such as temperature, pressure, and height and TC intensity.
My MS Thesis advisor, Chanh Kieu created an idealized framework for studying TC intensity trajectories that can be solved with a simple RK4 scheme.