K. D. Froyd
YOU?
Author Swipe
View article: Prior heterogeneous ice nucleation events shape homogeneous freezing during the evolution of synoptic cirrus
Prior heterogeneous ice nucleation events shape homogeneous freezing during the evolution of synoptic cirrus Open
In situ observations are currently used to classify synoptic cirrus as formed by homogeneous or heterogeneous ice nucleation based on ice residual analysis. We use UCLALES-SALSA to show the limitations of this method by demonstrating that …
View article: Strong springtime increase of ice-nucleating particle concentration in the Rocky Mountains
Strong springtime increase of ice-nucleating particle concentration in the Rocky Mountains Open
Ice nucleating particles (INPs) exert a substantial impact on radiative properties and lifetimes of mixed-phase clouds and can modulate their precipitation efficiency. Advancing our understanding of the abundance and properties of INPs is …
View article: Field intercomparison of ice nucleation measurements: the Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03)
Field intercomparison of ice nucleation measurements: the Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03) Open
The third phase of the Fifth International Ice Nucleation Workshop (FIN-03) was conducted at the Storm Peak Laboratory in Steamboat Springs, Colorado, in September 2015 to facilitate the intercomparison of instruments measuring ice-nucleat…
View article: Prior heterogeneous ice nucleation events increase likelihood of homogeneous freezing during the evolution of synoptic cirrus
Prior heterogeneous ice nucleation events increase likelihood of homogeneous freezing during the evolution of synoptic cirrus Open
In-situ observations are currently used to classify synoptic cirrus as formed by homogeneous or heterogeneous ice nucleation based on ice residual analysis. We use large-eddy model UCLALES-SALSA to show the limitations of this method by de…
View article: Widespread trace bromine and iodine in remote tropospheric non-sea-salt aerosols
Widespread trace bromine and iodine in remote tropospheric non-sea-salt aerosols Open
Reactive halogens catalytically destroy O3 and therefore affect (1) stratospheric O3 depletion and (2) the oxidative capacity of the troposphere. Reactive halogens also partition into the aerosol phase, but what governs halogen-aerosol par…
View article: Sea Spray Aerosol Over the Remote Oceans Has Low Organic Content
Sea Spray Aerosol Over the Remote Oceans Has Low Organic Content Open
Biogenic organic compounds in the surface ocean may significantly alter the cloud‐forming ability of sea spray aerosol and thereby affect the amount of solar radiation reaching the ocean surface. Estimates of the organic mass fraction of s…
View article: Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere
Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere Open
Each year, commercial ships emit over 1.67 Tg of particulate matter (PM) pollution into the atmosphere. These ships rely on the combustion of heavy fuel oil, which contains high levels of sulfur, large aromatic organic compounds, and metal…
View article: Supplementary material to "The Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03): Field Intercomparison of Ice Nucleation Measurements"
Supplementary material to "The Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03): Field Intercomparison of Ice Nucleation Measurements" Open
Clouds arriving.The road was again dusty in the morning (not pictured).Brown haze layer is present.Stronger winds from West in the daytime (10 AM -4 PM).
View article: The Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03): Field Intercomparison of Ice Nucleation Measurements
The Fifth International Workshop on Ice Nucleation Phase 3 (FIN-03): Field Intercomparison of Ice Nucleation Measurements Open
The third phase of the Fifth International Ice Nucleation Workshop (FIN-03) was conducted at Storm Peak Laboratory in Steamboat Springs, Colorado in September 2015 to facilitate the intercomparison of instruments measuring ice nucleating p…
View article: Comment on egusphere-2024-1399
Comment on egusphere-2024-1399 Open
Abstract. Reactive halogens catalytically destroy O3 and therefore affect (1) stratospheric O3 depletion, and (2) the oxidative capacity of the troposphere. Reactive halogens also partition into the a…
View article: Non-sea-salt aerosols that contain trace bromine and iodine are widespread in the remote troposphere
Non-sea-salt aerosols that contain trace bromine and iodine are widespread in the remote troposphere Open
Reactive halogens catalytically destroy O3 and therefore affect (1) stratospheric O3 depletion, and (2) the oxidative capacity of the troposphere. Reactive halogens also partition into the aerosol phase, but what governs halogen-aerosol pa…
View article: Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol
Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol Open
Heterogeneous chemical cycles of pyrogenic nitrogen and halides influence tropospheric ozone and affect the stratosphere during extreme Pyrocumulonimbus (PyroCB) events. We report field‐derived N 2 O 5 uptake coefficients, γ (N 2 O 5 ), an…
View article: Observationally constrained analysis of sulfur cycle in the marine atmosphere with NASA ATom measurements and AeroCom model simulations
Observationally constrained analysis of sulfur cycle in the marine atmosphere with NASA ATom measurements and AeroCom model simulations Open
The atmospheric sulfur cycle plays a key role in air quality, climate, and ecosystems, such as pollution, radiative forcing, new particle formation, and acid rain. In this study, we compare the spatially and temporally resolved measurement…
View article: Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol
Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol Open
Heterogeneous chemical cycles of pyrogenic nitrogen and halides influence tropospheric ozone and affect the stratosphere during extreme pyrocumulonimbus (PyroCB) events. We report field-derived N2O5 uptake coefficients, γ(N2O5), and ClNO2 …
View article: Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere
Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere Open
Each year, commercial ships emit over 1.2 Tg of particulate matter (PM) pollution into the atmosphere. These ships rely on the combustion of heavy fuel oil, which contains high levels of sulfur, large aromatic organic compounds, and metals…
View article: Supplementary material to "Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere"
Supplementary material to "Measurement report: Vanadium-containing ship exhaust particles detected in and above the marine boundary layer in the remote atmosphere" Open
View article: Comment on egusphere-2023-1966
Comment on egusphere-2023-1966 Open
Abstract. The sulfur cycle plays a key role in atmospheric air quality, climate, and ecosystems. In this study, we compare the spatial and temporal distribution of four sulfur-containing species, dimethyl sulfide (DMS), su…
View article: Metals from spacecraft reentry in stratospheric aerosol particles
Metals from spacecraft reentry in stratospheric aerosol particles Open
Large increases in the number of low earth orbit satellites are projected in the coming decades [L. Schulz, K.-H. Glassmeier, Adv. Space Res. 67 , 1002–1025 (2021)] with perhaps 50,000 additional satellites in orbit by 2030 [GAO, Large con…
View article: Comment on egusphere-2023-1966 tagging method
Comment on egusphere-2023-1966 tagging method Open
Abstract. The sulfur cycle plays a key role in atmospheric air quality, climate, and ecosystems. In this study, we compare the spatial and temporal distribution of four sulfur-containing species, dimethyl sulfide (DMS), su…
View article: Comment on egusphere-2023-1966
Comment on egusphere-2023-1966 Open
Abstract. The sulfur cycle plays a key role in atmospheric air quality, climate, and ecosystems. In this study, we compare the spatial and temporal distribution of four sulfur-containing species, dimethyl sulfide (DMS), su…
View article: Observationally constrained analysis of sulfur cycle in the marine atmosphere with NASA ATom measurements and AeroCom model simulations
Observationally constrained analysis of sulfur cycle in the marine atmosphere with NASA ATom measurements and AeroCom model simulations Open
The sulfur cycle plays a key role in atmospheric air quality, climate, and ecosystems. In this study, we compare the spatial and temporal distribution of four sulfur-containing species, dimethyl sulfide (DMS), sulfur dioxide (SO2), particu…
View article: Pyrocumulonimbus affect average stratospheric aerosol composition
Pyrocumulonimbus affect average stratospheric aerosol composition Open
Pyrocumulonimbus (pyroCb) are wildfire-generated convective clouds that can inject smoke directly into the stratosphere. PyroCb have been tracked for years, yet their apparent rarity and episodic nature lead to highly uncertain climate imp…
View article: Global distribution of Asian, Middle Eastern, and North African dust simulated by CESM1/CARMA
Global distribution of Asian, Middle Eastern, and North African dust simulated by CESM1/CARMA Open
Dust aerosols affect the radiative and energy balance at local and global scales by scattering and absorbing sunlight and infrared light. A previous study suggests that dust size distribution is one of the major sources of uncertainty in m…
View article: Comment on acp-2022-406
Comment on acp-2022-406 Open
Abstract. Dust aerosols affect the radiative and energy balance at local and global scales by scattering and absorbing sunlight and infrared light. A previous study suggests that dust size distribution is one of the major …
View article: Comment on acp-2022-406
Comment on acp-2022-406 Open
Abstract. Dust aerosols affect the radiative and energy balance at local and global scales by scattering and absorbing sunlight and infrared light. A previous study suggests that dust size distribution is one of the major …
View article: Supplementary material to "Global Distribution of Asian, Middle Eastern, and Saharan Dust Simulated by CESM1/CARMA"
Supplementary material to "Global Distribution of Asian, Middle Eastern, and Saharan Dust Simulated by CESM1/CARMA" Open
View article: Global Distribution of Asian, Middle Eastern, and Saharan Dust Simulated by CESM1/CARMA
Global Distribution of Asian, Middle Eastern, and Saharan Dust Simulated by CESM1/CARMA Open
Dust aerosols affect the radiative and energy balance at local and global scales by scattering and absorbing sunlight and infrared light. Parameterizations of dust lifting, microphysics, as well as physical and radiative properties of dust…
View article: Measurements of ice-nucleating particle concentration and size at Storm Peak Laboratory
Measurements of ice-nucleating particle concentration and size at Storm Peak Laboratory Open
<p>The presence of ice in mixed-phase clouds has a vital impact on their radiative properties, lifetime, and  ability to precipitate. Ice crystal formation is initially induced by a rare subset of ambient aerosol  p…
View article: Identifying chemical aerosol signatures using optical suborbital observations: how much can optical properties tell us about aerosol composition?
Identifying chemical aerosol signatures using optical suborbital observations: how much can optical properties tell us about aerosol composition? Open
Improvements in air quality and Earth's climate predictions require improvements of the aerosol speciation in chemical transport models, using observational constraints. Aerosol speciation (e.g., organic aerosols, black carbon, sulfate, ni…
View article: The Balance Between Heterogeneous and Homogeneous Nucleation of Ice Clouds Using CAM5/CARMA
The Balance Between Heterogeneous and Homogeneous Nucleation of Ice Clouds Using CAM5/CARMA Open
We present a modification to the Community Aerosol and Radiation model for Atmospheres (CARMA) sectional ice microphysical model where we have added interactive nucleation of sulfates and heterogeneous nucleation onto dust in order to crea…