A5042856852- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Atmospheric aerosols and clouds
- Methane Hydrates and Related Phenomena
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Groundwater flow and contamination studies
- Meteorological Phenomena and Simulations
- Soil and Unsaturated Flow
- Aeolian processes and effects
- Climate variability and models
- Geophysical and Geoelectrical Methods
- Soil Moisture and Remote Sensing
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Soil erosion and sediment transport
- Atmospheric and Environmental Gas Dynamics
- Plant nutrient uptake and metabolism
- Irrigation Practices and Water Management
- Tropical and Extratropical Cyclones Research
- Radiomics and Machine Learning in Medical Imaging
- Hydraulic Fracturing and Reservoir Analysis
- Precipitation Measurement and Analysis
- Astrophysics and Cosmic Phenomena
- Soil Mechanics and Vehicle Dynamics
Caribbean Disaster Emergency Management Agency
2015-2024
University of Colorado Anschutz Medical Campus
2021-2022
National Institute of Meteorology
2020-2021
Caribbean Institute for Meteorology and Hydrology
2016-2018
Agri Food and Biosciences Institute
2017
University of the West Indies
2013
University Radiology
2013
Southwest Research Institute
2000-2006
Northwestern University
2005-2006
University of Manitoba
1994-1998
Abstract North Africa is the world’s largest source of dust, a large part which transported across Atlantic to Caribbean and beyond where it can impact radiation clouds. Many aspects this transport its climate effects remain speculative. The Saharan Aerosol Long-Range Transport Aerosol–Cloud-Interaction Experiment (SALTRACE; www.pa.op.dlr.de/saltrace) linked ground-based airborne measurements with remote sensing modeling techniques address these issues in program that took place 2013/14....
Trade-wind cumuli constitute the cloud type with highest frequency of occurrence on Earth, and it has been shown that their sensitivity to changing environmental conditions will critically influence magnitude pace future global warming. Research over last decade pointed out importance interplay between clouds, convection circulation in controling this sensitivity. Numerical models represent diverse ways, which translates into different responses trade-cumuli climate perturbations. Climate...
Abstract Clouds over the ocean, particularly throughout tropics, are poorly understood and drive much of uncertainty in model-based projections climate change. In early 2010, Max Planck Institute for Meteorology Caribbean Hydrology established Barbados Cloud Observatory (BCO) on windward edge Barbados. At 13°N BCO samples seasonal migration intertropical convergence zone (ITCZ), from well-developed winter trades dominated by shallow cumulus to transition deep convection as ITCZ migrates...
Abstract. The science guiding the EUREC4A campaign and its measurements is presented. comprised roughly 5 weeks of in downstream winter trades North Atlantic – eastward southeastward Barbados. Through ability to characterize processes operating across a wide range scales, marked turning point our observationally study factors influencing clouds trades, how they will respond warming, their link other components earth system, such as upper-ocean or life cycle particulate matter. This...
Abstract. Triple-wavelength polarization lidar measurements in Saharan dust layers were performed at Barbados (13.1° N, 59.6° W), 5000–8000 km west of the sources, framework Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE-1, June–July 2013, SALTRACE-3, 2014). Three case studies are discussed. High quality was achieved by comparing linear depolarization ratio profiles measured 355, 532, 1064 nm with respective dual-wavelength (355, 532 nm) a reference lidar. A...
Abstract The hydraulic properties of a Waukegan loam profile were determined by field and laboratory procedures. Pressure‐water content relationships obtained in the found to be variable at pressures above −100 cm water. In this range data considered more reliable. Hydraulic conductivity was from flux hydraulic‐head gradient data. Hydraulic‐head gradients tensiometric measurements pressure various depths. soil that subject both evaporation drainage, position downward moving “zero flux”...
Abstract. Triple-wavelength lidar observations of the depolarization ratio and backscatter coefficient marine aerosol as a function relative humidity (RH) are presented with 5 min time resolution. The measurements were performed at Barbados (13° N, 59° W) during Saharan Aerosol Long-range Transport Aerosol-Cloud interaction Experiment (SALTRACE) winter campaign in February 2014. phase transition from spherical sea salt particles to cubic-like crystals was observed polarization lidar....
Abstract A configuration of the High-Altitude Long-Range Research Aircraft (HALO) as a remote sensing cloud observatory is described, and its use illustrated with results from first second Next-Generation Remote Sensing for Validation (NARVAL) field studies. Measurements NARVAL (NARVAL2) are used to highlight ability HALO, when configured in this fashion, characterize not only distribution water condensate atmosphere, but also impact on radiant energy transfer covarying large-scale...
Abstract. To manage Earth in the Anthropocene, new tools, institutions, and forms of international cooperation will be required. Virtualization Engines is proposed as an federation centers excellence to empower all people respond immense urgent challenges posed by climate change.
Abstract Primary root elongation rates of pea seedlings ( Pisum sativa L. ‘Alaska’) and soil resistance to penetration a probe were measured in remolded cores sandy loam clay soils over water suction range 0.1–1.0 bar. Physical was varied by varying bulk density content. more closely correlated with 10° than 60° probe. It also normal the probe, which does not include soil‐metal friction, total point friction component. While may be equivalent soil‐root this correlation suggests that between...
A physicomathematical alternative to capillaric modeling of the pore structure porous media is proposed. With this model, hydraulic conductivity materials determined from a ‘pore domain’ characterization space by using an appropriate conductance theory for estimating flux contribution various components heterogeneous media. The proposed model versatile yet mathematically tractable and capable analyzing fluid flow through widely differing including anisotropic structured comparative study...
Abstract. The CARRIBA (Cloud, Aerosol, Radiation and tuRbulence in the trade wInd regime over BArbados) project, focused on high resolution collocated measurements of thermodynamic, turbulent, microphysical, radiative properties wind cumuli Barbados, is introduced. project based two one-month field campaigns November 2010 (climatic wet season) April 2011 dry season). Observations are helicopter-borne ground-based an area 100 km2 off coast Barbados. accompanied by long-term observations at...
Abstract. The present study aims to evaluate lidar retrievals of cloud-relevant aerosol properties by using polarization and coincident airborne in situ measurements the Saharan Air Layer (SAL) over Barbados region. Vertical profiles number concentration cloud condensation nuclei (CCN), large particles (diameter d>500 nm), surface area, mass, ice-nucleating particle (INP) are derived from compared with CCN concentrations INP-relevant measured aircraft. were performed framework Aerosol...
Ground‐penetrating radar (GPR) signals are attenuated by both absorption and scattering. We performed low‐frequency (<100 MHz) GPR surveys at the Volcanic Tableland of Bishop (California) Tuff to evaluate factors that control depth investigation develop insight into capabilities such radars for Mars. The subsurface reflection character was very different two commercial systems used; together, they revealed internal welding contacts in tuff an abundance discrete scatterers. Attenuation...
Climate services are becoming an important strategy for delivering climate information to users around the world. In many countries, National Meteorological and Hydrological Services (NMHSs) charged with providing diverse audiences. foster adaptation risks in reducing vulnerability developing world contexts. However, production delivery of user-oriented place new burdens on NMHSs require skillsets, partnerships, infrastructure. this paper, we assess capabilities 22 Caribbean Small Island...
Abstract Interest in the Green‐Ampt equation to predict infiltration rates into uniform and layered soils has increased recent years. The work reported here is a study of theoretical justification determining suction (at wetting front) parameter from hydraulic conductivity versus capillary relationship for soil. It shown that front so determined used form which allows surface boundary condition initially being one constant flux gives predictions volumes comparable those by numerical solution...
Abstract A method is described for measuring axial strain in a remolded loam soil under unconfined loading both compression and tension. Using this the stress‐strain relationships were determined soil‐water contents ranging from 2% to 12% by weight. The maximum tensile stress beam stressed failure modulus of rupture test was computed measured relationships. This fiber approximately 10% greater than strength. energy required tension, taken as area curve, shown increase only 20% sixfold...
Abstract Rooting characteristics and water extraction patterns in the root zone of a mature soybean ( Glycine max L.) crop were determined field. Although rooting density for liter samples soil varied from 0.07 to 5.0 cm/cm 3 , nearly 60% exhibited densities 1.0 2.0 range. Densities near plant row at depths 20 45 cm interrow space tended be well above average. Elsewhere random manner. Total length per was about 680 m. Mean diameters ranged 120 500 µm with 150 300 range being most common....
Abstract Soil‐water pressure and water‐loss patterns in the root zone of soybean ( Glycine max L.) genotype P.I. 79.648 were determined from daily observations during irrigation‐drying cycles for four growth periods after planting. Tensiometric measurements soil water made on a 10‐cm square grid one plant row to an adjacent spaced 80 cm apart, between 10‐ 70‐cm depths. Water contents inferred pressure‐water content relationships. During first cycle, soil‐water pressures marked by strong...
Abstract. To manage Earth in the Anthropocene, new tools, institutions, and forms of international cooperation will be required. Virtualization Engines are proposed as federation centers excellence to empower all people respond immense urgent challenges posed by climate change.
United States Department of Agriculture Agricultural Research Service. USDA, in cooperation with the Minnesota Experiment Station, University Minnesota, St. Paul, Minnesota. Paper No. 7444 Scientific Journal Series.