A5049113514- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Fire effects on ecosystems
- Climate variability and models
- Geochemistry and Geologic Mapping
- Meteorological Phenomena and Simulations
- Ocular and Laser Science Research
- Seismic Imaging and Inversion Techniques
- Peatlands and Wetlands Ecology
- Image Processing Techniques and Applications
- Chemistry and Stereochemistry Studies
- Advanced Measurement and Metrology Techniques
- Paleontology and Stratigraphy of Fossils
- Remote Sensing in Agriculture
- Scientific Measurement and Uncertainty Evaluation
- Reservoir Engineering and Simulation Methods
- Industrial Vision Systems and Defect Detection
- Advanced Measurement and Detection Methods
- Calibration and Measurement Techniques
- Geochemistry and Elemental Analysis
- Optical measurement and interference techniques
- Spectroscopy and Chemometric Analyses
- Radioactivity and Radon Measurements
- Remote-Sensing Image Classification
Courant Institute of Mathematical Sciences
2022-2024
New York University
2023-2024
Cornell University
2019-2021
Tiverton and District Hospital
1975
The Ohio State University
1937
Abstract. Cirrus clouds composed of small ice crystals are often the first solid matter encountered by sunlight as it streams into Earth's atmosphere. A broad array recent research has emphasized that photon particle scattering calculations very sensitive to morphology, complexity, and surface roughness. Uncertain variations in these parameters have major implications for successfully parameterizing radiative ramifications cirrus climate models. To date, characterization microscale details...
Abstract Molybdenum (Mo) is a key cofactor in enzymes used for nitrogen (N) fixation and nitrate reduction, the low availability of Mo can constrain N inputs, affecting ecosystem productivity. Natural atmospheric aerosolization deposition from sources such as desert dust, sea‐salt spray, volcanoes affect function across long timescales, but anthropogenic activities combustion, motor vehicles, agricultural dust have accelerated natural cycle. Here we combined synthesis global concentration...
Airborne and orbital imaging spectroscopy can facilitate the quantification of chemical physical attributes surface materials through analysis spectral signatures. Prior to analysis, estimates reflectance must be inferred from radiance measurements in a process known as atmospheric correction, which compensates for distortion electromagnetic signal by atmosphere. Inaccuracies correction alter characteristic signatures, leading subsequent mischaracterization properties. Global observations...
ABSTRACT Photomicrographs of enameled sheets at high temperatures, giving the different stages reboiling cycle and observations deductions therefrom, are presented.
Abstract Western North American fires have been increasing in magnitude and severity over the last few decades. The complex coupling of with atmospheric energy budget meteorology creates short-term feedbacks on regional weather altering amount pollution to which Americans are exposed. Using a combination model simulations observations, this study shows that severe summer 2017 increased aerosol concentrations leading cooling air at surface, reductions sensible heat fluxes, lowering planetary...
Abstract Two key challenges in the development of data‐driven gravity‐wave parameterizations are generalization, how to ensure that a scheme trained on present‐day climate will continue work new regime, and calibration, account for biases “host” model. Both problems depend fundamentally response out‐of‐sample inputs compared with training dataset, often conflicting. The ability generalize regimes goes hand sensitivity model biases. To probe these challenges, we employ one‐dimensional (1D)...
Abstract We train random and boosted forests, two machine learning architectures based on regression trees, to emulate a physics‐based parameterization of atmospheric gravity wave momentum transport. compare the forests neural network benchmark, evaluating both offline errors online performance when coupled an model under present day climate in 800 1,200 ppm CO 2 global warming scenarios. Offline, forest exhibits similar skill network, while scores significantly lower. Both models couple...
We train random and boosted forests, two machine learning architectures based on regression trees, to emulate a physics-based parameterization of atmospheric gravity wave momentum transport. compare the forests neural network benchmark, evaluating both offline errors online performance when coupled an model under present day climate in 800 1200 ppm CO2 global warming scenarios. Offline, forest exhibits similar skill network, while scores significantly lower. Both models couple stably model,...
The performance of the flat plate or cosine type incident light receptor is compared with that hemispherical cardioid type, and values are suggested for photographic constants when these two types used. After an introductory description techniques exposure determination difference in deduced by consideration their angular response characteristics relation to particular lighting conditions. Experimental evidence given support theoretical considerations.
Remote imaging spectroscopy's role in Earth science will grow the coming decade as a series of globe-spanning spectroscopy missions launch from NASA, ESA, and other agencies. The nature remote change, advancing short regional studies to address global multi-year questions. diversity data also with exposure wider range biomes atmospheric conditions. To execute these new investigations we must reconcile diverse observing conditions derive consistent maps. this end, rigorous uncertainty...
This paper attempts to analyse the conditions at present considered necessary for correct determination of exposure monochrome and reversal colour film, as made by meters control devices automatic cameras. It takes into consideration factors on which calibration films, cameras is based, gives presently accepted values various photographic constants, both arithmetic logarithmic methods specification film speed.
Photogrophic tests have been carried out to test the efficacy in exposure determination of two different types incident light receptor. That having cardioid type characteristic proved superior flot plate Specification conditions for former are suggested and justified by results tests. Consideration is given validity techniques adopted conduct
<p>An essential step in implementing any new parameterization is calibration, where the adjusted to work with an existing model and yield some desired improvement. In context of gravity wave (GW) momentum transport, calibration necessitated by facts that: (i) Some GWs are always at least partially resolved model, hence a should only account for missing waves. Worse, may need correct misrepresentation under-resolved GWs, i.e., coarse vertical resolution can bias GW breaking...
The most recent estimate of the focal plane exposure required to produce acceplable photography is different from that assumed a few year ago. This paper considers effect change in this on conclusions “Calibration level films and devices” published 1968. It also shows film speed can conveniently be repre ented characteristic.