A5072526428- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Atmospheric chemistry and aerosols
- Cryospheric studies and observations
- Aeolian processes and effects
- Atmospheric Ozone and Climate
- Climate variability and models
- Geophysics and Gravity Measurements
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Ocean Acidification Effects and Responses
- Arctic and Antarctic ice dynamics
- Ionosphere and magnetosphere dynamics
- Oceanographic and Atmospheric Processes
- Non-Invasive Vital Sign Monitoring
- Air Quality Monitoring and Forecasting
- Transportation Planning and Optimization
- Space exploration and regulation
- Icing and De-icing Technologies
- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Earthquake Detection and Analysis
- Scientific Measurement and Uncertainty Evaluation
North Carolina State University
2015-2025
Colorado State University
2022
Mayo Clinic in Arizona
2017
Brookhaven National Laboratory
2006
Abstract The Clouds, Aerosol, and Precipitation in the Marine Boundary Layer (CAP-MBL) deployment at Graciosa Island Azores generated a 21-month (April 2009–December 2010) comprehensive dataset documenting clouds, aerosols, precipitation using Atmospheric Radiation Measurement Program (ARM) Mobile Facility (AMF). scientific aim of is to gain improved understanding interactions marine boundary layer. straddles between subtropics midlatitudes northeast Atlantic Ocean consequently experiences...
Saharan dust storms have often been observed from space, but the full impact on Earth's radiation balance has difficult to assess, due limited observations surface. We present first simultaneous space and a comprehensive new mobile facility in Niamey, Niger, of major storm March 2006. The results indicate perturbations both at top atmosphere Combining satellite surface data, we also estimate itself. Using independent data facility, derive optical properties input these other information into...
Abstract. Winter storms can cause significant societal impacts in the densely-populated regions of Northeast United States. Mesoscale snow bands embedded within winter are often main focus snowfall forecasts and analyses. This study investigates relationship between observed surface rates local enhancements radar reflectivity (i.e. mesoscale bands) using data from 264 storm days over 11 seasons (2012–2023). We compare hourly obtained by ASOS weather stations with area × time fractions...
Abstract. Atmospheric gravity waves (i.e., buoyancy waves) can occur within stable layers when vertical oscillations are triggered by localized heating, flow over terrain, or imbalances in upper-level flow. Case studies of winter storms have associated with heavier surface snowfall accumulations, but the representativeness those findings for settings without orographic precipitation has not been previously addressed. We deployed networks high-precision pressure sensors from January 2020 to...
Where and at what altitudes electromagnetic wave ducts within the atmosphere are likely to occur is important for a variety of communication military applications. We examined modified refractivity profiles duct characteristics derived from nearly 50,000 observed upper air soundings obtained over four years seven tropical subtropical islands, as well middle latitude sites US coastal locations, three near Great Lakes, inland sites. Across all location types, elevated were found be more common...
Abstract Marine boundary layer clouds are modified by processes at different spatial and temporal scales. To isolate the governing aerosol–cloud–precipitation interactions, multiday synoptic variability of environment must be accounted for. Information on location low relative to ridge–trough pattern gives insight into how cloud properties vary as a function environmental subsidence stability. The technique self-organizing maps (SOMs) is employed objectively classify 500-hPa geopotential...
Abstract. Mesoscale pressure waves, including atmospheric gravity outflow and frontal passages, wake lows, are outputs of can potentially modify clouds precipitation. The vertical motions associated with these waves the temperature relative humidity air parcels thus yield irreversible changes to cloud precipitation content those parcels. A wavelet-based method for identifying tracking types wave signals in time series data from networks low-cost, high-precision (0.8 Pa noise floor, 1 Hz...
Abstract. Radar observations of winter storms often exhibit locally enhanced linear features in reflectivity, sometimes labeled as snow bands. We have developed a new, objective method for detecting echo radar data from storms. In comparison to convective cells warm season precipitation, these are usually less distinct the background and more fuzzy or feathered edges. This technique identifies both prominent, strong subtle, faint features. A key difference previous reflectivity feature...
Abstract Density currents (i.e., cold pools or outflows) beneath marine stratocumulus clouds are characterized using 30 days of ship-based observations obtained during the 2008 Variability American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study Regional Experiment (VOCALS-REx) in southeast Pacific. An air density increase criterion applied to Improved Meteorological (IMET) sensor data identified 71 current front, core (peak density), and tail (dissipating) zones. The similarity...
A shrinking marine refrigerator Low subtropical clouds scatter solar radiation back to space and thereby cool the climate system. Most work on understanding changes in coverage of these types has focused effects sea surface temperatures or aerosols. Yuter et al. show that dynamic due atmospheric gravity waves are responsible for rapid clearing large areas clouds. This phenomenon also implications ecology biogeochemistry. Science , this issue p. 697
Abstract. This empirical study demonstrates the feasibility of using 89-GHz Advanced Microwave Scanning Radiometer–Earth Observing System (AMSR-E) passive microwave brightness temperature data to detect heavily drizzling cells within subtropical marine stratocumulus. For purpose this paper, we define as areas ≥ 6 km × 4 with C-band Z > 0 dBZ; equivalent 0.084 mm h−1. A binary heavy drizzle product is described that can be used determine areal and feature statistics major stratocumulus...
Abstract. Atmospheric gravity waves (i.e., buoyancy waves) can occur within stable layers when vertical oscillations are triggered by localized heating, flow over terrain, or imbalances in upper level flow. Case studies of winter storms have associated with heavier surface snowfall, but the representativeness those findings for settings without orographic precipitation has not been previously addressed. To detect waves, we deployed networks high precision pressure sensors from January 2020...
Abstract. Radar observations of winter storms often exhibit locally-enhanced linear features in reflectivity, sometimes labeled as snow bands. We have developed a new, objective method for detecting echo radar data from storms. In comparison to convective cells warm season precipitation, these are usually less distinct the background and more fuzzy or feathered edges. This technique identifies both prominent, strong subtle, faint features. A key difference previous reflectivity feature...
The hypothesis that areas of high oceanic productivity affect the physical properties shallow marine clouds via production secondary organic aerosols is evaluated using satellite data. correlation between chlorophyll a concentrations, an indication productivity, and low cloud droplet liquid phase effective radius ( R e ) examined for several ocean regions time periods. While strong can occur specific periods in some locations, not reproducible other intermittent concentrations coincidence...
[1] The paper "Why do tornados and hailstorms rest on weekends?" [Rosenfeld Bell, 2011] (hereinafter RB2011) contains key misunderstandings of US spring summer tornadoes, supercell storms, their environments. In this comment, we show that (1) there is not a robust weekly cycle or midweek maximum in tornado occurrence days, (2) RB2011's physical explanation for how increased aerosol concentrations would cause frequency severity tornadoes hail supercells inconsistent with actual storm...
Abstract. Mesoscale, wave-like perturbations in horizontal air motions the troposphere (velocity waves) are associated with vertical velocity, temperature, and pressure that can initiate or enhance precipitation within clouds. The ability to detect velocity waves from wind information is an important tool for atmospheric research weather forecasting. This paper presents a method routinely using Doppler radial data scanning radar. utilizes difference field between consecutive position plan...
Abstract Ice habit diagrams published prior to 2009—and many since—do not accurately describe in situ observations of ice shapes as a function temperature and moisture. Laboratory studies analysis field by Bailey Hallett series papers 2002, 2004, 2009 corrected several errors from earlier studies, but their work has been widely disseminated. We present new, simplified diagram based on Hallett’s that focuses growth forms arising the underlying surface processes which mass is added crystal:...
Abstract. In winter storms, enhanced radar reflectivity is often associated with heavy snow. However, some higher reflectivities are the result of mixed precipitation including melting The correlation coefficient (a dual-polarization variable) can identify regions precipitation, but this information usually presented separately from reflectivity. Especially under time pressure, data users mistake for snow because high cognitive load comparing in two fields while simultaneously attempting to...
Abstract Forecasts from NOAA's Global Forecast System (GFS) and the High‐Resolution Rapid Refresh (HRRR) weather models are matched to surface observations for winter season of November 2019 March 2020 at 210 airports across United States. The 2‐m temperature errors, conditioned on observed conditions such as cloud cover amount wind speed, used determine nature systematic model biases. We observe a strong diurnal cycle in errors GFS with 50% 25% sky cover, 1°C warm bias night 2°C cold during...
Ama Dablam (6812m) in the Khumbu (Everest) region as storm clouds build. (Photo credit: L.B. Perry/National Geographic.) In April and May 2019, National Geographic Rolex's Perpetual Planet Expedition to Mt Everest (hereafter 2019 Expedition) undertook most comprehensive science expedition (Mt Everest) included teams of scientists investigating a range topics, including glacier change, upward shifts ecosystems, black carbon deposition on surfaces snow/ice/water chemistry (Mayewski et al.,...