My research interests revolve around land surface physiology, or the interaction of physiological processes at the land surface with weather and climate. I focus on developing remote sensing methods for measuring plant and ecosystem physiology on a global scale. This includes the spatial and temporal patterns of plant function that drive ecosystem metabolism across the land surface, the physiological response of vegetation to weather, soils and climate, and the role of plant-atmosphere gas exchange in the global carbon and water cycles. My main focus is on satellite remote sensing of photosynthesis and transpiration and methods of scaling fluxes from leaf to globe. This involves an interdisciplinary approach that combines physiology, meteorology, remote sensing, and modeling.
Ecosystem physiology: Interrelationships among plant, soil and atmospheric processes that determine whole ecosystem metabolism of carbon, water, energy and nutrients [adapted from Mooney et al. 1999].
After many years in academia, I am currently a research scientist with Corteva Agriscience in Johnston, Iowa where I apply imaging and remote sensing technologies to plant phenotyping. In addition to my work with Corteva Agriscience I continue research as an independent scientist to pursue the development of remote sensing methods for quantifying biosphere-atmosphere interactions and global plant physiology. I am currently working with colleagues at JPL to produce high spatial and temporal resolution estimates of global evapotranspiration using satellite observations.