Using a combination of laboratory and field experiments, the performance of a Partech Instruments Ltd IR40-C active head suspended solids sensor has been tested with respect to changing particle size distribution and rapid variation in suspended sediment transport rate. The sensor, which utilizes light attenuation in the infrared waveband, has several advantages both over visible light optical ...

Wildland fire radiant energy emission is one of the only measurements of combustion that can be made at high temporal and spatial resolutions. Furthermore, spatially and temporally explicit measurements are critical for making inferences about ecological fire effects. Although the correlation between fire frequency and plant biological diversity in frequently burned coniferous forests is well d...

Variations in snow cover and vegetation in the Province of Quebec, Canada, were characterized for a transect spanning from 50uN to 60uN during the International Polar Year field campaign of February 2008. The main objective of this study was to compare measured (AMSR-E) and modeled (MEMLS) brightness temperature (Tb) and to analyze differences in the in situ measurement of snow water equivalent...

A vector radiative-transfer code has been developed that is able to accurately and efficiently calculate radiance and polarization scattered from Earth’s limb. A primary application of this code will be towards generating weighting functions, based on calculated limb radiances, for the retrieval of trace gases (O3, NO2, BrO, OClO, and O4) from the optical spectrograph and infrared imaging syste...

Quantum integrable systems have very strong mathematical properties that allow an exact description of their energetic spectrum. From the Bethe equations, I formulate the Baxter “T-Q” relation, that is the starting point of two complementary approaches based on nonlinear integral equations. The first one is known as thermodynamic Bethe ansatz, the second one as Klümper-Batchelor-Pearce-Destride...

— The normalized configuration entropy, based on the theory of information, when applied to the image of heterogeneous media, points out a characteristic length of the disorder, `opt, at which we calculate the optical properties. The models we propose make a partition of the image between percolated and non percolated cells of size `opt, in which we calculate effective dielectric functions. Two...

We measured growing season soil CO, evolution under elevated atmospheric CO, and soil nitrogen (N) additions. Our objectives were to determine treatment effects, quantify seasonal variation, and determine regulating mechanisms. Elevated CO, treatments were applied in opentop chambers containing 3-year-old ponderosa pine ponderosa Dougl. ex Laws.) seedlings. Nitrogen applications were made annua...

A common challenge when comparing forest canopy cover and similar metrics across different ecosystems is that there are many fieldand landscape-level measurement methods. This research conducts a cross-comparison and evaluation of forest canopy cover metrics produced using unmixing of reflective spectral satellite data, light detection and ranging (lidar) data, and data collected in the field w...