A5024098809- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Aeolian processes and effects
- Fire effects on ecosystems
- Remote Sensing in Agriculture
- Advanced Optical Sensing Technologies
- Remote Sensing and LiDAR Applications
- Robotics and Sensor-Based Localization
- Radiative Heat Transfer Studies
- Solar Radiation and Photovoltaics
- Ionosphere and magnetosphere dynamics
- Cryospheric studies and observations
- Robotic Path Planning Algorithms
- Software Engineering Research
- Robotics and Automated Systems
- Icing and De-icing Technologies
- Infrared Target Detection Methodologies
- Advanced Aircraft Design and Technologies
- Vehicle emissions and performance
- Data Visualization and Analytics
- Planetary Science and Exploration
University of Iowa
2022-2024
Goddard Space Flight Center
2012-2023
University of Maryland, Baltimore County
2020
University of Virginia
2017
California Institute of Technology
2014
UNSW Sydney
2011-2013
Michigan State University
2009-2011
Nara Women's University
2009
University of Wisconsin–Madison
2008-2009
National Aeronautics and Space Administration
2009
The Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP, pronounced the same as “calliope”) is a spaceborne two‐wavelength polarization lidar that has been acquiring global data since June 2006. CALIOP provides high resolution vertical profiles of clouds and aerosols, designed very large linear dynamic range to encompass full signal returns from aerosols clouds. primary instrument carried by Infrared Pathfinder Satellite Observations (CALIPSO) satellite, which was launched on April 28,...
Abstract Accurate knowledge of the vertical and horizontal extent clouds aerosols in earth’s atmosphere is critical assessing planet’s radiation budget for advancing human understanding climate change issues. To retrieve this fundamental information from elastic backscatter lidar data acquired during Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) mission, a selective, iterated boundary location (SIBYL) algorithm has been developed deployed. SIBYL accomplishes its...
Abstract An assessment of the performance Moderate Resolution Imaging Spectroradiometer (MODIS) cloud mask algorithm for Terra and Aqua satellites is presented. The MODIS output compared with lidar observations from ground [Arctic High-Spectral Lidar (AHSRL)], aircraft [Cloud Physics (CPL)], satellite-borne [Geoscience Laser Altimeter System (GLAS)] platforms. comparison 3 yr coincident combined radar product Department Energy (DOE) Atmospheric Radiation Measurement (ARM) Program Southern...
A large class of diagrams can be informally characterized as node–link diagrams. Typically nodes represent entities, and links relationships between them. The discipline graph drawing is concerned with methods for abstract versions such At the foundation are a set aesthetics (rules layout) that, it assumed, will produce graphs that clearly understood. Examples include minimizing edge crossings sum lengths edges. However, few notable exceptions, these taken axiomatic, have not been...
The new Cloud Physics Lidar (CPL) has been built for use on the NASA ER-2 high-altitude aircraft. purpose of CPL is to provide multiwavelength measurements cirrus, subvisual and aerosols with high temporal spatial resolution. utilizes state-of-the-art technology a repetition rate, low-pulse-energy laser, photon-counting detection. first deployment was Southern African Regional Science Initiative's 2000 field campaign during August September 2000. We here an overview instrument initial data...
Optically thin cirrus near the tropical tropopause regulate humidity of air entering stratosphere, which in turn has a strong influence on Earth’s radiation budget and climate. Recent high-altitude, unmanned aircraft measurements provide evidence for two distinct classes formed region: ( i ) vertically extensive with low ice number concentrations, extinctions, large supersaturations (up to ∼70%) respect ice; ii layers much higher concentrations that effectively deplete vapor excess...
The Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) satellite provides a new and exciting opportunity to study clouds aerosols in the Earth's atmosphere using range‐resolved laser remote sensing. Following successful launch of CALIPSO satellite, validation flights were conducted long‐established Cloud Physics (CPL) verify CALIPSO's calibration validate various data products. This paper presents results initial comparisons made between spaceborne lidar airborne CPL....
In this paper, we describe the algorithm that will be used during upcoming Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission for discriminating between clouds aerosols detected in two‐wavelength backscatter lidar profiles. We first analyze single‐test multiple‐test classification approaches based on one‐dimensional (1‐D) multidimensional probability distribution functions (PDFs) context of a two‐class feature identification scheme. From these studies derive...
Abstract. In situ measurements of ice crystal concentrations and sizes made with aircraft instrumentation over the past two decades have often indicated presence numerous relatively small (< 50 μm diameter) crystals in cirrus clouds. Further, these frequently indicate that account for a large fraction extinction The fact instruments used to make measurements, such as Forward Scattering Spectrometer Probe (FSSP) Cloud Aerosol (CAS), ingest into sample volume through inlets has led...
The Cloud-Aerosol Transport System (CATS) is an elastic backscatter lidar that was launched on 10 January 2015 to the International Space Station (ISS). CATS provides both space-based technology demonstrations for future Earth Science missions and operational science measurements. This paper outlines Level 1 data products processing algorithms. Initial results validation demonstrate ability accurately detect optically thin atmospheric layers with 1064 nm nighttime as low 5.0E−5 km−1 sr−1....
The Cloud-Aerosol Transport System (CATS) is a multi-wavelength lidar instrument developed to enhance Earth Science remote sensing capabilities from the International Space Station. CATS project was chartered be an experiment in all senses: science, technology, and management. As low-cost following strict build-to-cost/ build-to-schedule philosophy, new management approach while also serving as technology demonstration for future NASA missions. This presentation will highlight science...
Abstract The February–March 2014 deployment of the National Aeronautics and Space Administration (NASA) Airborne Tropical Tropopause Experiment (ATTREX) provided unique in situ measurements western Pacific tropical tropopause layer (TTL). Six flights were conducted from Guam with long-range, high-altitude, unmanned Global Hawk aircraft. ATTREX payload water vapor, meteorological conditions, cloud properties, tracer chemical radical concentrations, radiative fluxes. campaign was partially...
Constraint of the vertical distribution aerosol particles is crucial for study plume structure, radiative effects, and ultimately monitoring surface air pollution. We developed an algorithm to retrieve optical central height (AOCH) absorbing aerosols by using, first time, oxygen (O2) A B absorption band measurements from TROPOspheric Monitoring Instrument (TROPOMI) over dark targets. For retrieval, narrow radiance at seven channels ranging ultraviolet (UV) shortwave infrared (SWIR) are...
The most common method of ascertaining cloud heights from space is thermal brightness temperatures. Deep convective clouds high water content are expected to radiate as black bodies. Here, top estimates GOES‐8 compared with direct where the should be sensed, based on colocated Goddard Cloud Physics Lidar (CPL) observations collected during Cirrus Regional Study Tropical Anvils and Florida Area Experiment (CRYSTAL‐FACE). consistently ∼1 km lower than “visible” lidar, even though latter take...
We discuss the estimation of random errors due to shot noise in backscatter lidar observations that use either photomultiplier tube (PMT) or avalanche photodiode (APD) detectors. The statistical characteristics photodetection are reviewed, and photon count distributions solar background signals laser examined using airborne at 532 nm a photon-counting mode APD. Both appear be Poisson, indicating arrival photodetector photons for these is Poisson stochastic process. For Poisson- distributed...
Word comprehension engages the left ventrolateral prefrontal (lVLPFC) and posterior lateral-temporal cortices (PLTC). The contributions of these brain regions to remain controversial. We hypothesized that PLTC activates meanings, whereas lVLPFC resolves competition between representations. To test this hypothesis, we used functional magnetic resonance imaging (fMRI) assess independent effects adaptation on neural activity. Participants judged relatedness word pairs. Some consecutive pairs...
During the dry season airborne campaign of Southern African Regional Science Initiative (SAFARI 2000), coordinated observations were made massive thick aerosol layers. These layers often dominated by aerosols from biomass burning. We report on Sun photometer measurements optical depth (λ = 0.354–1.557 μm), columnar water vapor, and vertical profiles extinction vapor density that obtained aboard University Washington's Convair‐580 research aircraft. compare these with ground‐based AERONET...
An empirical relationship is derived between the multiple-scattering fraction and linear depolarization ratio by using Monte Carlo simulations of water clouds measured backscatter lidar. This shown to hold for having a wide range extinction coefficients, mean droplet sizes, size distribution widths. The also persist various instrument fields view measurements made within broken cloud fields. results obtained from are verified multiple-field-of-view lidar measurements. For space-based lidars...
Abstract This paper presents the motivation for, and initial results from, Multiple Altimeter Beam Experimental lidar (MABEL) instrument. The MABEL instrument provides a new capability for airborne altimetry measurements serves as prototype simulator upcoming NASA second-generation Ice, Cloud, Land Elevation Satellite (ICESat-2) mission. Designed to be highly flexible in measurement capability, both demonstration of science tool cryospheric biospheric remote sensing. It is important document...
Abstract Accurate knowledge of cloud optical properties, such as extinction-to-backscatter ratio and depolarization ratio, can have a significant impact on the quality extinction retrievals from lidar systems because parameterizations these variables are often used in nonideal conditions to determine phase depth. Statistics trends parameters analyzed for 4 yr (2003–07) physics data during five projects that occurred varying geographic locations meteorological seasons....
Abstract Smoke particles can be injected by pyrocumulonimbus (pyroCb) in the upper troposphere and lower stratosphere, but their effects on radiative budget of planet remain elusive. Here, focusing record‐setting Pacific Northwest pyroCb event August 2017, we show with satellite‐based estimates emissions injection heights a chemical transport model (GEOS‐Chem) that smoke result forcing ∼0.02 W/m 2 at top atmosphere averaged globally months following up to 0.9 K/day heating Arctic...
Abstract. We investigate the dust forecasts from two operational global atmospheric models in comparison with situ and remote sensing measurements obtained during AERosol properties – Dust (AER-D) field campaign. Airborne elastic backscatter lidar were performed on board Facility for Atmospheric Measurements August 2015 over eastern Atlantic, they permitted us to characterise vertical distribution detail, offering insights transport Sahara. They complemented airborne of size optical...
Abstract. The Cloud-Aerosol Transport System (CATS) lidar on board the International Space Station (ISS) operated from 10 February 2015 to 30 October 2017 providing range-resolved vertical backscatter profiles of Earth's atmosphere at 1064 and 532 nm. CATS instrument design ISS orbit lead a higher nm signal-to-noise ratio than previous space-based lidars, allowing for direct atmospheric calibration signals. Nighttime version 3-00 data were calibrated by scaling measured model expected...
During the July 2002 Cirrus Regional Study of Tropical Anvils and Layers‐Florida Area Experiment (CRYSTAL‐FACE), flights a WB‐57F aircraft revealed mixing ratios nitric oxide 10–50 times background over distances 25–175 km in anvils thunderstorms clear air downwind storm systems due to lightning activity possible transport from boundary layer. Estimates total mass NO x injected into middle upper troposphere differed considerably for moderately versus highly electrically active system as...
Recent space‐based lidar missions rely on assumptions about the spectral dependence of backscatter signals from cirrus clouds to calibrate measurements made at 1064 nm. In particular, calibration procedure employed by Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission assumes that color ratio, defined as ratio particulate coefficients nm 532 nm, has a value 1.00, with an expected standard deviation order 0.04. This work assesses accuracy this assumption, its...