John E. Yorks
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View article: The diurnal cycle and temperature dependence of crystal shapes in ice clouds from satellite lidar polarized measurements
The diurnal cycle and temperature dependence of crystal shapes in ice clouds from satellite lidar polarized measurements Open
The shape of crystals in ice clouds influences many aspects of the cloud lifecycle and radiative impact, yet they are extremely variable and hard to categorize. In this paper, we apply a recent crystal shape classification methodology to 3…
View article: Enhancing Surface PM<sub>2.5</sub> Air Quality Estimates in GEOS Using CATS Lidar Data
Enhancing Surface PM<sub>2.5</sub> Air Quality Estimates in GEOS Using CATS Lidar Data Open
Spaceborne lidar offers unique advantages for improving global estimates of fine particulate matter (), traditionally limited by critical data gaps in the vertical dimension. Here, we present a new method to retrieve relying on ensembles o…
View article: Future Satellite Observations of the Dynamics and Microphysics of Convection from the NASA Atmosphere Observing System (AOS)
Future Satellite Observations of the Dynamics and Microphysics of Convection from the NASA Atmosphere Observing System (AOS) Open
Atmospheric convection plays a fundamental role in the vertical redistribution of atmospheric constituents, in driving atmospheric circulation, and in creating severe weather conditions that put life and property at risk. Cloud and precipi…
View article: Evaluation of ICESat-2 ATL09 Atmospheric Products Using CALIOP and MODIS Space-Based Observations
Evaluation of ICESat-2 ATL09 Atmospheric Products Using CALIOP and MODIS Space-Based Observations Open
Since its launch in 2018, the Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) mission has provided atmospheric products, including calibrated backscatter profiles and cloud and aerosol layer detection. While not the primary focus of …
View article: Statistics of Smoke Sphericity and Optical Properties Using Spaceborne Lidar Measurements
Statistics of Smoke Sphericity and Optical Properties Using Spaceborne Lidar Measurements Open
Smoke particles from biomass burning events are typically assumed to be spherical despite previous observations of non-spherical smoke. As such, large uncertainties exist in some physical and optical parameters used in lidar aerosol retrie…
View article: Evaluation of Physical Microphysical Property Retrieval Algorithms during the 2020 IMPACTS Field Campaign
Evaluation of Physical Microphysical Property Retrieval Algorithms during the 2020 IMPACTS Field Campaign Open
The NASA Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign provides high-quality, high-altitude aircraft lidar (532 nm), radar (W band), and in-cloud microphysical aircraft d…
View article: Statistically Resolved Planetary Boundary Layer Height Diurnal Variability Using Spaceborne Lidar Data
Statistically Resolved Planetary Boundary Layer Height Diurnal Variability Using Spaceborne Lidar Data Open
The Planetary Boundary Layer Height (PBLH) significantly impacts weather, climate, and air quality. Understanding the global diurnal variation of the PBLH is particularly challenging due to the necessity of extensive observations and suita…
View article: A Deep Learning Lidar Denoising Approach for Improving Atmospheric Feature Detection
A Deep Learning Lidar Denoising Approach for Improving Atmospheric Feature Detection Open
Space-based atmospheric backscatter lidars provide critical information about the vertical distribution of clouds and aerosols, thereby improving our understanding of the climate system. They are additionally useful for detecting hazards t…
View article: The ALICAT Lidar for NASA&#8217;s Atmosphere Observing System (AOS) Storm: Implications for Synergistic Diurnal Sampling of Aerosols, Clouds, and Precipitation
The ALICAT Lidar for NASA’s Atmosphere Observing System (AOS) Storm: Implications for Synergistic Diurnal Sampling of Aerosols, Clouds, and Precipitation Open
The Atmospheric Lidar for Clouds and Aerosol Transport (ALICAT) is a SmallSat elastic backscatter lidar planned to fly in NASA’s AOS-Storm orbit with an anticipated launch in early 2029 with a planned 2-year lifetime. ALICAT will pro…
View article: Synergistic Retrievals of Ice in High Clouds from Elastic Backscatter Lidar, Ku-Band Radar, and Submillimeter Wave Radiometer Observations
Synergistic Retrievals of Ice in High Clouds from Elastic Backscatter Lidar, Ku-Band Radar, and Submillimeter Wave Radiometer Observations Open
In this study, we investigate the synergy of elastic backscatter lidar, Ku-band radar, and submillimeter-wave radiometer measurements in the retrieval of ice from satellite observations. The synergy is analyzed through the generation of a …
View article: Cloud-Top Phase Characterization of Extratropical Cyclones over the Northeast and Midwest United States: Results from IMPACTS
Cloud-Top Phase Characterization of Extratropical Cyclones over the Northeast and Midwest United States: Results from IMPACTS Open
Cloud-top phase (CTP) impacts cloud albedo and pathways for ice particle nucleation, growth, and fallout within extratropical cyclones. This study uses airborne lidar, radar, and Rapid Refresh analysis data to characterize CTP within extra…
View article: An Investigation of Non‐Spherical Smoke Particles Using CATS Lidar
An Investigation of Non‐Spherical Smoke Particles Using CATS Lidar Open
Smoke particles originating from biomass burning events are typically assumed to be spherical, yet non‐spherical smoke particles are also reported from in situ observations. The spatial and temporal distributions of non‐spherical smoke par…
View article: High‐Resolution Snowstorm Measurements and Retrievals Using Cross‐Platform Multi‐Frequency and Polarimetric Radars
High‐Resolution Snowstorm Measurements and Retrievals Using Cross‐Platform Multi‐Frequency and Polarimetric Radars Open
Many studies have performed microphysical retrievals using radars of different frequencies, platforms, and methodologies. However, little is known about the consistency of retrievals derived from different radar platforms (i.e., airborne o…
View article: Machine learning-enabled real-time detection of cloud and aerosol layers using airborne lidar
Machine learning-enabled real-time detection of cloud and aerosol layers using airborne lidar Open
Lidar profiling of the atmosphere provides information on existence of cloud and aerosol layers and the height and structure of those layers. Knowledge of feature boundaries is a key input to assimilation models. Moreover, identifying feat…
View article: A SmallSat Concept to Resolve Diurnal and Vertical Variations of Aerosols, Clouds, and Boundary Layer Height
A SmallSat Concept to Resolve Diurnal and Vertical Variations of Aerosols, Clouds, and Boundary Layer Height Open
A SmallSat mission concept is formulated here to carry out Time-varying Optical Measurements of Clouds and Aerosol Transport (TOMCAT) from space while embracing low-cost opportunities enabled by the revolution in Earth science observation …
View article: First Mapping of Monthly and Diurnal Climatology of Saharan Dust Layer Height Over the Atlantic Ocean From EPIC/DSCOVR in Deep Space
First Mapping of Monthly and Diurnal Climatology of Saharan Dust Layer Height Over the Atlantic Ocean From EPIC/DSCOVR in Deep Space Open
The monthly and hourly climatology of Saharan dust layer height over the Atlantic, at a spatial resolution of ∼10 km, is obtained for the first time, via a passive remote sensing technique. The technique is applied to multiple years of Ear…
View article: The NASA Atmosphere Observing System (AOS): Future Space-Based and Suborbital Observations for the Study of Coupled Aerosol-Cloud-Precipitation Interactions
The NASA Atmosphere Observing System (AOS): Future Space-Based and Suborbital Observations for the Study of Coupled Aerosol-Cloud-Precipitation Interactions Open
NASA’s future Earth System Observatory (ESO) will provide key information related to understanding climate change processes, mitigating natural hazards, fighting forest fires, and improving real-time agricultural processes.…
View article: Aerosol Detection from the Cloud–Aerosol Transport System on the International Space Station: Algorithm Overview and Implications for Diurnal Sampling
Aerosol Detection from the Cloud–Aerosol Transport System on the International Space Station: Algorithm Overview and Implications for Diurnal Sampling Open
Concentrations of particulate aerosols and their vertical placement in the atmosphere determine their interaction with the Earth system and their impact on air quality. Space-based lidar, such as the Cloud–Aerosol Transport System (CATS) t…
View article: Constrained Retrievals of Aerosol Optical Properties Using Combined Lidar and Imager Measurements During the FIREX-AQ Campaign
Constrained Retrievals of Aerosol Optical Properties Using Combined Lidar and Imager Measurements During the FIREX-AQ Campaign Open
Smoke aerosols arise from a variety of regional sources and fuel types dependent on the properties of the fire, leading to spatial variability in smoke composition and optical properties. After emission, these aerosols age and mix in the a…
View article: Planetary Boundary Layer Height Estimates From ICESat-2 and CATS Backscatter Measurements
Planetary Boundary Layer Height Estimates From ICESat-2 and CATS Backscatter Measurements Open
The lowest layer of the atmosphere in which all human activity occurs is called the Planetary Boundary Layer (PBL). All physical interactions with the surface, such as heat and moisture transport, pollution dispersion and transport happen …
View article: First retrieval of absorbing aerosol height over dark target using TROPOMI oxygen B band: Algorithm development and application for surface particulate matter estimates
First retrieval of absorbing aerosol height over dark target using TROPOMI oxygen B band: Algorithm development and application for surface particulate matter estimates Open
Constraint of the vertical distribution of aerosol particles is crucial for the study of aerosol plume structure, aerosol radiative effects, and ultimately monitoring surface air pollution. We developed an algorithm to retrieve the aerosol…
View article: Aerosol Properties in Cloudy Environments from Remote Sensing Observations: A Review of the Current State of Knowledge
Aerosol Properties in Cloudy Environments from Remote Sensing Observations: A Review of the Current State of Knowledge Open
Aerosol properties are fundamentally different near clouds than away from clouds. This paper reviews the current state of knowledge of aerosol properties in the near-low-cloud environment and quantitatively compares them with aerosols far …
View article: Aerosol and Cloud Detection Using Machine Learning Algorithms and Space-Based Lidar Data
Aerosol and Cloud Detection Using Machine Learning Algorithms and Space-Based Lidar Data Open
Clouds and aerosols play a significant role in determining the overall atmospheric radiation budget, yet remain a key uncertainty in understanding and predicting the future climate system. In addition to their impact on the Earth’s climate…
View article: A global analysis of diurnal variability in dust and dust mixture using CATS observations
A global analysis of diurnal variability in dust and dust mixture using CATS observations Open
The current study investigates the diurnal cycle of dust and dust mixture loading across the global tropics, subtropics, and mid-latitudes by analyzing aerosol extinction and typing profiles observed by the Cloud-Aerosol Transport System (…
View article: Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations
Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations Open
We investigate the dust forecasts from two operational global atmospheric models in comparison with in situ and remote sensing measurements obtained during the AERosol properties – Dust (AER-D) field campaign. Airborne elastic backscatter …
View article: A Classification of Ice Crystal Habits Using Combined Lidar and Scanning Polarimeter Observations during the SEAC4RS Campaign
A Classification of Ice Crystal Habits Using Combined Lidar and Scanning Polarimeter Observations during the SEAC4RS Campaign Open
Using collocated NASA Cloud Physics Lidar (CPL) and Research Scanning Polarimeter (RSP) data from the Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC 4 RS) campaign, a new observation…
View article: A Global Analysis of Dust Diurnal Variability Using CATS Observations
A Global Analysis of Dust Diurnal Variability Using CATS Observations Open
The current study investigates the diurnal cycle of dust loading across the global tropics, sub-tropics, and mid-latitudes by analyzing aerosol extinction and typing profiles observed by the Cloud–Aerosol Transport System (CATS) lidar aboa…
View article: Differences in the Evolution of Pyrocumulonimbus and Volcanic Stratospheric Plumes as Observed by CATS and CALIOP Space-Based Lidars
Differences in the Evolution of Pyrocumulonimbus and Volcanic Stratospheric Plumes as Observed by CATS and CALIOP Space-Based Lidars Open
Recent fire seasons have featured volcanic-sized injections of smoke aerosols into the stratosphere where they persist for many months. Unfortunately, the aging and transport of these aerosols are not well understood. Using space-based lid…