B. L. Ehlmann
YOU?
Author Swipe
View article: Spaceborne mineral mapping reduces dust’s shortwave radiative impact uncertainty
Spaceborne mineral mapping reduces dust’s shortwave radiative impact uncertainty Open
Mineral dust impacts climate through complex interactions with radiation, which remain poorly quantified due to uncertainties in the amount of light-absorbing iron oxides within dust particles. NASA’s EMIT imaging spectrometer, now deliver…
View article: Surface texture and mineralogy of main belt asteroids from JWST mid-infrared spectroscopy
Surface texture and mineralogy of main belt asteroids from JWST mid-infrared spectroscopy Open
The population of main belt asteroids includes both primitive Solar System bodies as well as the products of early planetesimal melting and differentiation. The surface compositions of these objects shed light on their origins and evolutio…
View article: A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets
A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets Open
JWST’s MIRI LRS provides the first opportunity to spectroscopically characterize the surface compositions of close-in terrestrial exoplanets. Models for the bare-rock spectra of these planets often utilize a spectral library from R. Hu et …
View article: A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets
A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets Open
JWST's MIRI LRS provides the first opportunity to spectroscopically characterize the surface compositions of close-in terrestrial exoplanets. Models for the bare-rock spectra of these planets often utilize a spectral library from R. Hu et …
View article: Observations and Quantitative Compositional Analysis of Ceres, Pallas, and Hygiea Using JWST/NIRSpec
Observations and Quantitative Compositional Analysis of Ceres, Pallas, and Hygiea Using JWST/NIRSpec Open
We present JWST Near Infrared Spectrograph (NIRSpec) measurements of the three largest low-albedo main-belt asteroids: (1) Ceres, (2) Pallas, and (10) Hygiea. Their reflectance spectra all have very similar absorptions centered near 2.72 μ…
View article: A 2‐Billion‐Year History of Water‐Alteration in Terra Sirenum, Mars: Volcanism's Influence on Aluminum Clay Formation and Chemically Distinct Waters Forming Sulfates and Chlorides Into the Amazonian
A 2‐Billion‐Year History of Water‐Alteration in Terra Sirenum, Mars: Volcanism's Influence on Aluminum Clay Formation and Chemically Distinct Waters Forming Sulfates and Chlorides Into the Amazonian Open
Terra Sirenum, a region of Noachian highlands southwest of the Tharsis volcanic complex, is unique in the number, proximity, and diversity of orbital detections of secondary minerals, as the sole region found to date hosting large‐scale de…
View article: Inorganic interpretation of luminescent materials encountered by the Perseverance rover on Mars
Inorganic interpretation of luminescent materials encountered by the Perseverance rover on Mars Open
A major objective of the Mars 2020 mission is to sample rocks in Jezero crater that may preserve organic matter for later return to Earth. Using an ultraviolet Raman and luminescence spectrometer, the Perseverance rover detected luminescen…
View article: Characterization of the particle size distribution, mineralogy, and Fe mode of occurrence of dust-emitting sediments from the Mojave Desert, California, USA
Characterization of the particle size distribution, mineralogy, and Fe mode of occurrence of dust-emitting sediments from the Mojave Desert, California, USA Open
Constraining dust models to understand and quantify the effect of dust upon climate and ecosystems requires comprehensive analyses of the physiochemical properties of dust-emitting sediments in arid regions. Building upon previous studies …
View article: Constraining Ceres' exposed ice: grain size, abundance, and is it salty?
Constraining Ceres' exposed ice: grain size, abundance, and is it salty? Open
Ubiquitous phyllosilicates and carbonates in Ceres’ surface regolith reveal extensive water-rock interaction in the past [1]. A key area of continued study is the water ice content of the crust and how it is mixed with regolith or sa…
View article: Variable Iron Mineralogy and Redox Conditions Recorded in Ancient Rocks Measured by In Situ Visible/Near‐Infrared Spectroscopy at Jezero Crater, Mars
Variable Iron Mineralogy and Redox Conditions Recorded in Ancient Rocks Measured by In Situ Visible/Near‐Infrared Spectroscopy at Jezero Crater, Mars Open
Using relative reflectance measurements from the Mastcam‐Z and SuperCam instruments on the Mars 2020 Perseverance rover, we assess the variability of Fe mineralogy in Noachian/Hesperian‐aged rocks at Jezero crater. The results reveal diver…
View article: Characterizing Hydrated Sulfates and Altered Phases in Jezero Crater Fan and Floor Geologic Units With SHERLOC on Mars 2020
Characterizing Hydrated Sulfates and Altered Phases in Jezero Crater Fan and Floor Geologic Units With SHERLOC on Mars 2020 Open
The Mars 2020 Perseverance rover has explored fluvio‐lacustrine sedimentary rocks within Jezero crater. Prior work showed that igneous crater floor Séítah and Máaz formations have mafic mineralogy with alteration phases that indicate multi…
View article: The Global Context Camera (CTX) Mosaic of Mars: A Product of Information‐Preserving Image Data Processing
The Global Context Camera (CTX) Mosaic of Mars: A Product of Information‐Preserving Image Data Processing Open
The Mars Reconnaissance Orbiter and its Context Camera (CTX) have acquired more than 100,000 separate panchromatic images that capture nearly the entire surface of Mars at ∼5–6 m/pixel. This paper describes a data processing workflow used …
View article: Probing Iceland's dust-emitting sediments: particle size distribution, mineralogy, cohesion, Fe mode of occurrence, and reflectance spectra signatures
Probing Iceland's dust-emitting sediments: particle size distribution, mineralogy, cohesion, Fe mode of occurrence, and reflectance spectra signatures Open
Characterising the physico-chemical properties of dust-emitting sediments in arid regions is fundamental to understanding the effects of dust on climate and ecosystems. However, knowledge regarding high-latitude dust (HLD) remains limited.…
View article: Detection of a 2.85 μm Feature on Five Spinel-rich Asteroids from JWST
Detection of a 2.85 μm Feature on Five Spinel-rich Asteroids from JWST Open
Ground-based observations of “Barbarian” L-type asteroids at 1–2.5 μ m indicate that their near-infrared spectra are dominated by the mineral spinel, which has been attributed to a high abundance of calcium-aluminum inclusions (CAIs)—the f…
View article: Comment on egusphere-2024-434
Comment on egusphere-2024-434 Open
Abstract. Understanding the effect of dust upon climate and ecosystems needs comprehensive analyses of the physiochemical properties of dust-emitting sediments in arid regions. Here, we analyse a diverse set of crusts and aeolian ripples (…
View article: Elevation Anomalies of the Volcanic Floor Unit and Their Relationships to the Multiple Lakes of Jezero Crater, Mars
Elevation Anomalies of the Volcanic Floor Unit and Their Relationships to the Multiple Lakes of Jezero Crater, Mars Open
We reassessed several orbital topographic data sets for the Perseverance rover landing site at Jezero Crater, Mars to better understand its floor units. Tens‐of‐meters deep topographic anomalies occur in the volcanic floor of Jezero crater…
View article: Hyperspectral mapping of a kilometer of mantle rock core: insight into active serpentinization systems 
Hyperspectral mapping of a kilometer of mantle rock core: insight into active serpentinization systems  Open
Serpentinization is one of the major processes of silicate alteration in the solar system. Associated reactions are drivers for redox disequilibria and sources of H2, which are favorable to habitability. Minerals formed are responsible for…
View article: Characterization of the particle size distribution, mineralogy and Fe mode of occurrence of dust-emitting sediments across the Mojave Desert, California, USA
Characterization of the particle size distribution, mineralogy and Fe mode of occurrence of dust-emitting sediments across the Mojave Desert, California, USA Open
Understanding the effect of dust upon climate and ecosystems needs comprehensive analyses of the physiochemical properties of dust-emitting sediments in arid regions. Here, we analyse a diverse set of crusts and aeolian ripples (n=55) from…
View article: Comment on egusphere-2024-157
Comment on egusphere-2024-157 Open
Abstract. Characterizing physico-chemical properties of dust-emitting sediments in arid regions is fundamental to understand the effect of dust on climate and ecosystems. For high-latitude dust (HLD), this knowledge is scarce. This study f…
View article: Comment on egusphere-2024-157
Comment on egusphere-2024-157 Open
Abstract. Characterizing physico-chemical properties of dust-emitting sediments in arid regions is fundamental to understand the effect of dust on climate and ecosystems. For high-latitude dust (HLD), this knowledge is scarce. This study f…
View article: Supplementary material to "Probing Iceland's Dust-Emitting Sediments: Particle Size Distribution, Mineralogy, Cohesion, Fe Mode of Occurrence, and Reflectance Spectra Signatures"
Supplementary material to "Probing Iceland's Dust-Emitting Sediments: Particle Size Distribution, Mineralogy, Cohesion, Fe Mode of Occurrence, and Reflectance Spectra Signatures" Open
Composite sample, obtained after mixing an equal batch of each type of sample.The contents are in % of mass. 33V. G.
View article: Probing Iceland's Dust-Emitting Sediments: Particle Size Distribution, Mineralogy, Cohesion, Fe Mode of Occurrence, and Reflectance Spectra Signatures
Probing Iceland's Dust-Emitting Sediments: Particle Size Distribution, Mineralogy, Cohesion, Fe Mode of Occurrence, and Reflectance Spectra Signatures Open
Characterizing physico-chemical properties of dust-emitting sediments in arid regions is fundamental to understand the effect of dust on climate and ecosystems. For high-latitude dust (HLD), this knowledge is scarce. This study focuses on …
View article: Evidence of Sulfate‐Rich Fluid Alteration in Jezero Crater Floor, Mars
Evidence of Sulfate‐Rich Fluid Alteration in Jezero Crater Floor, Mars Open
Sulfur plays a major role in martian geochemistry and sulfate minerals are important repositories of water. However, their hydration states on Mars are poorly constrained. Therefore, understanding the hydration and distribution of sulfate …
View article: Crustal Hydration Primed Early Mars with Warm and Habitable Conditions
Crustal Hydration Primed Early Mars with Warm and Habitable Conditions Open
Geological evidence suggests that ancient Mars held substantial volumes of surface liquid water[1–2], lost over time due to crustal hydration[17] and atmospheric escape[7]. Resolving the Mars Faint Young Sun Paradox, or explaining how the …
View article: On-orbit Calibration and Performance of the EMIT Imaging Spectrometer
On-orbit Calibration and Performance of the EMIT Imaging Spectrometer Open
The Earth surface Mineral dust source InvesTigation (EMIT) is a remote visible to shortwave infrared (VSWIR) imaging spectrometer that will map the mineralogy of Earth's mineral dust forming regions. EMIT was launched to the International …
View article: Bright Na‐Carbonate Exposures Reveal Recent, Widespread Mobilization of Material in Ceres' Shallow Subsurface
Bright Na‐Carbonate Exposures Reveal Recent, Widespread Mobilization of Material in Ceres' Shallow Subsurface Open
Striking exposures of Na‐carbonate‐bearing bright materials are found in Ahuna Mons and the central landforms of Occator and other impact craters on Ceres; however, most bright materials on its surface occur as excavated material on the ri…