A5034922132- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Solar Radiation and Photovoltaics
- Precipitation Measurement and Analysis
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Remote Sensing in Agriculture
- Cryospheric studies and observations
- Calibration and Measurement Techniques
- Icing and De-icing Technologies
- Advanced Optical Sensing Technologies
- Arctic and Antarctic ice dynamics
- Infrared Target Detection Methodologies
- Earthquake Detection and Analysis
- Air Traffic Management and Optimization
- Tropical and Extratropical Cyclones Research
- Ocular and Laser Science Research
- Opportunistic and Delay-Tolerant Networks
- Space exploration and regulation
- Statistical and numerical algorithms
- Cardiac Imaging and Diagnostics
- Fault Detection and Control Systems
Colorado State University
2018-2025
University of South Dakota
2025
Chang Gung University
2024
Chang Gung Memorial Hospital
2024
University of Reading
2010-2019
Met Office
2018-2019
Cooperative Institute for Research in Environmental Sciences
2019
NOAA Earth System Research Laboratory
2012-2019
National Centre for Earth Observation
2016-2018
Karlsruhe Institute of Technology
2018
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...
Abstract With their extensive coverage, marine low clouds greatly impact global climate. Presently, are poorly represented in climate models, and the response of to changes atmospheric greenhouse gases aerosols remains major source uncertainty simulations. The eastern North Atlantic (ENA) is a region persistent but diverse subtropical boundary layer clouds, whose albedo precipitation highly susceptible perturbations aerosol properties. In addition, ENA periodically impacted by continental...
Many of the clouds important to Earth's energy balance, from Tropics Arctic, contain small amounts liquid water. Longwave and shortwave radiative fluxes are very sensitive perturbations cloud water path (LWP), when LWP is (i.e., < 100 g m−2; with less than this threshold will be referred as "thin"). Thus, properties these thin must well understood capture them correctly in climate models. We review importance explain difficulties observing them. In particular, because thin, potentially mixed...
An assessment of aerosol‐cloud interactions (ACI) from ground‐based remote sensing under coastal stratiform clouds is presented. The utilizes a long‐term, high temporal resolution data set the Atmospheric Radiation Measurement (ARM) Program deployment at Pt. Reyes, California, United States, in 2005 to provide statistically robust measures ACI and characterize variability based on environmental conditions observational approaches. average N (= dln d /dln α , change cloud drop number...
Abstract Massive economic and population growth, urbanization are expected to lead a tripling of anthropogenic emissions in southern West Africa (SWA) between 2000 2030. However, the impacts this on human health, ecosystems, food security, regional climate largely unknown. An integrated assessment is challenging due (a) superposition effects with global change; (b) strong dependence variable African monsoon; (c) incomplete scientific understanding interactions emissions, clouds, radiation,...
Abstract Retrievals of ice and snow are made from Ka‐ W‐band zenith‐pointing Doppler radars at Hyytiälä, Finland, during the experiment component Biogenic Aerosols: Effects on Clouds Climate (2014) field campaign. In a novel optimal estimation retrieval, mean velocity is exploited to retrieve density factor parameter, which modulates mass, shape, terminal velocity, backscatter cross sections particles. case study including aggregate graupel we find that rate ensemble can be retrieved within...
A first-of-a-kind, extended-term cloud aircraft campaign was conducted to obtain an in situ statistical characterization of continental boundary layer clouds needed investigate processes and refine retrieval algorithms. Coordinated by the Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF), Routine AAF Clouds with Low Optical Water Depths (CLOWD) Radiative Observations (RACORO) field operated over ARM Southern Great Plains (SGP) site from 22 January 30 June 2009, collecting 260 h...
Abstract The European Union (EU)-funded project Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) investigates the relationship between weather, climate, and air pollution southern Africa—an area with rapid population growth, urbanization, an increase anthropogenic aerosol emissions. over this region contains a unique mixture of natural gases, liquid droplets, particles, emitted environment which multilayer clouds frequently form. These exert large influence on local...
Many processes in the geosciences are highly complex and computationally challenging or &#160;not well known. In those cases, Machine Learning, especially Deep is becoming increasingly popular to either replace expensive numerical models parts of models, describe relations between variables where underlying equations unknown. Despite many successful applications, uptake Learning science has been slow because proper uncertainty estimates lacking, while these crucial for comparison...
Abstract A revised Bayesian algorithm for estimating surface rain rate, convective proportion, and latent heating profiles from satellite-borne passive microwave radiometer observations over ocean backgrounds is described. The searches a large database of cloud-radiative model simulations to find cloud that are radiatively consistent with given set radiance measurements. properties these then composited obtain best estimates the observed properties. supported by an expanded more physically...
Abstract Estimating the impact of radiation transport through cloud sides on global energy budget is hampered by lack a fast scheme suitable for use in atmospheric models that can represent these effects both shortwave and longwave. This two‐part paper describes development such scheme, which we refer to as Speedy Algorithm Radiative Transfer Cloud Sides (SPARTACUS). The principle method add extra terms two‐stream equations lateral between clear cloudy regions, vary proportion length edge...
Abstract Current weather and climate models neglect 3‐D radiative transfer through cloud sides, which can change the effect (CRE) significantly. This two‐part paper describes development of SPeedy Algorithm for Radiative TrAnsfer CloUd Sides (SPARTACUS) to capture these effects efficiently in a two‐stream radiation scheme use global models. The present concerns longwave spectral region, where not much work has been done previously, although limited previous suggested that sides increases...
Cloud optical depth is one of the most poorly observed climate variables. The new “cloud mode” capability in Aerosol Robotic Network (AERONET) will inexpensively yet dramatically increase cloud observations both number and accuracy. mode retrievals from AERONET were evaluated at Atmospheric Radiation Measurement program's Oklahoma site sky conditions ranging broken clouds to overcast. For overcast cases, 1.5 min average depths agreed within 15% those a standard ground‐based flux method. also...
Abstract Tropical Applications of Meteorology Using Satellite and Ground-Based Observations (TAMSAT) rainfall estimates are used extensively across Africa for operational monitoring food security applications; thus, regional evaluations TAMSAT essential to ensure its reliability. This study assesses the performance estimates, along with African Rainfall Climatology (ARC), version 2; Measuring Mission (TRMM) 3B42 product; Climate Prediction Center morphing technique (CMORPH), against a dense...
Abstract We have extensively evaluated the response of cloud base drizzle rate ( R cb ; mm d −1 ) in warm clouds to liquid water path (LWP; g m −2 and condensation nuclei (CCN) number concentration N CCN cm −3 ), an aerosol proxy. This evaluation is based on a 19 month long data set Doppler radar, lidar, microwave radiometers, observing systems from Atmospheric Radiation Measurement (ARM) Mobile Facility deployments at Azores Germany. Assuming 0.55% supersaturation calculate , we found power...
The contribution of cloud to the radiation budget southern West Africa (SWA) is poorly understood and yet it important for understanding regional monsoon evolution evaluating improving climate models, which have large biases in this region. Radiative transfer calculations applied atmospheric profiles obtained from CERES– CloudSat–CALIPSO–MODIS (CCCM) dataset are used investigate effects 12 different types (defined by their vertical structure) on energy SWA (5°–10°N, 8°W–8°E) during...
Abstract. Active remote sensing of marine boundary-layer clouds is challenging as drizzle drops often dominate the observed radar reflectivity. We present a new method to simultaneously retrieve cloud and vertical profiles in drizzling using surface-based observations reflectivity, lidar attenuated backscatter, zenith radiances under conditions when precipitation does not reach surface. Specifically, structure droplet size water content both characterised throughout cloud. An ensemble...
Observing the reflected solar radiation (RSR) by Earth is crucial for monitoring and understanding our climate. While total RSR has typically been observed satellites in its broadband form (a single averaged value), it comprised of intricate spectral variability spectrum values). This contains "fingerprint" system properties processes that influence RSR. Only relatively recently progress made considering entire simultaneously. Simulating observations from SCanning Imaging Absorption...
Abstract. This study investigates marine and continental stratocumulus (Sc) cloud properties obtained from an automated implementation of a multispectral photometer retrieval. Photometer methods simultaneously retrieve optical depth (𝜏) droplet effective radius (re), with estimates for liquid water path (LWP) calculated on the availability those quantities. These efforts evaluate retrieved Sc identified during recent 6-year period collected over U.S. Department Energy Atmospheric Radiation...
Abstract Formation of ice in mixed-phase clouds may proceed via primary nucleation and secondary production (SIP). Primary involves the presence nucleating particles (INPs), while SIP follows nucleation, resulting crystal number concentrations (N ) exceeding INPs. The formation pathways young congestus are not well understood, nor environmental conditions favorable for onset SIP. Coincident airborne measurements INPs N collected during Secondary Production Ice Cumulus Experiment (SPICULE)...
Recent empirical studies have shown that multi‐angle spectral data can be useful for predicting canopy height, but the physical reason this correlation was not understood. We follow concept of invariants, specifically escape probability, to gain insight into observed correlation. Airborne Multi‐Angle Imaging Spectrometer (AirMISR) and airborne Laser Vegetation Sensor (LVIS) acquired during a NASA Terrestrial Ecology Program aircraft campaign underlie our analysis. Two multivariate linear...
Abstract. The ground-based Atmospheric Radiation Measurement Program (ARM) and NASA Aerosol Robotic Network (AERONET) routinely monitor clouds using zenith radiances at visible near-infrared wavelengths. Using the transmittance calculated from such measurements, we have developed a new retrieval method for cloud effective droplet size conducted extensive tests non-precipitating liquid water clouds. underlying principle is to combine liquid-water-absorbing wavelength (i.e., 1640 nm) with...
Abstract. Satellite remote sensing of rain is important for quantifying the hydrological cycle, atmospheric energy budget, and cloud precipitation processes; however, radar retrievals rate are sensitive to assumptions about raindrop size distribution. The upcoming EarthCARE satellite will feature a 94 GHz Doppler alongside lidar radiometer instruments, presenting opportunities enhanced