E. J. Jensen
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View article: On the Fate of Aerosols Produced by New Particle Formation in the Upper Troposphere and Lower Stratosphere
On the Fate of Aerosols Produced by New Particle Formation in the Upper Troposphere and Lower Stratosphere Open
New particle formation (NPF) in the upper troposphere and lower stratosphere (UTLS) has been suggested to contribute to cloud condensation nuclei in the troposphere, as well as for maintaining the stratospheric aerosol layer over the Asian…
View article: Aircraft observations of biomass burning pollutants in the equatorial lower stratosphere over the tropical western Pacific during boreal winter
Aircraft observations of biomass burning pollutants in the equatorial lower stratosphere over the tropical western Pacific during boreal winter Open
Recent studies hypothesize that emissions from fires reaching the stratosphere can provide aerosols and aerosol precursors that initiate stratospheric ozone loss and lead to radiative heating of the stratosphere and cooling of the surface.…
View article: The Impacts of Gravity Waves and Wind Shear on the Lifecycle of Cirrus Clouds in the Tropical Tropopause Layer
The Impacts of Gravity Waves and Wind Shear on the Lifecycle of Cirrus Clouds in the Tropical Tropopause Layer Open
In this study, we use two‐dimensional simulations to investigate the impacts of wind shear and gravity wave temperature fluctuations on the lifecycle of thin cirrus clouds in the tropical tropopause layer (TTL). Initial conditions for the …
View article: Dissecting cirrus clouds: navigating effects of turbulence on homogeneous ice formation
Dissecting cirrus clouds: navigating effects of turbulence on homogeneous ice formation Open
Turbulent air motions determine the local environment in which cloud ice crystals form. Homogeneous freezing of aqueous solution droplets is the most fundamental pathway to nucleate ice crystals in cirrus. Lack of knowledge about the role …
View article: Aircraft Observations of Continental Pollution In the Equatorial Lower Stratosphere over the Tropical Western Pacific During Boreal Winter
Aircraft Observations of Continental Pollution In the Equatorial Lower Stratosphere over the Tropical Western Pacific During Boreal Winter Open
Recent studies hypothesize that emissions from fires reaching the stratosphere can provide aerosols and aerosol precursors that initiate stratospheric ozone loss and lead to radiative heating of the stratosphere and cooling of the surface.…
View article: The Impact of Gravity Waves on the Evolution of Tropical Anvil Cirrus Microphysical Properties
The Impact of Gravity Waves on the Evolution of Tropical Anvil Cirrus Microphysical Properties Open
Anvil cirrus generated by deep convection covers large fractions of the tropics and has important impacts on the Earth's radiation budget and climate. In situ measurements made with high‐altitude aircraft indicate a rapid transition in ice…
View article: Opinion: Tropical cirrus – from micro-scale processes to climate-scale impacts
Opinion: Tropical cirrus – from micro-scale processes to climate-scale impacts Open
Tropical cirrus clouds, i.e., any type of ice cloud with tops above 400 hPa, play a critical role in the climate system and are a major source of uncertainty in our understanding of global warming. Tropical cirrus clouds involve processes …
View article: Ice Supersaturation Variability in Cirrus Clouds: Role of Vertical Wind Speeds and Deposition Coefficients
Ice Supersaturation Variability in Cirrus Clouds: Role of Vertical Wind Speeds and Deposition Coefficients Open
Aircraft measurements reveal ice supersaturation statistics in cirrus (ISSs) with broad maxima around ice saturation and pronounced variance. In this study, processes shaping ISSs in midlatitude and tropical upper tropospheric conditions a…
View article: July 2023 Medical Image of the Month: Primary Tracheal Lymphoma
July 2023 Medical Image of the Month: Primary Tracheal Lymphoma Open
No abstract available. Article truncated after 150 words. A 72-year-old woman was referred to our practice from an outside hospital with a history of tracheal mass with impending airway compromise. She originally presented with several day…
View article: Opinion: Tropical cirrus — From micro-scale processes to climate-scale impacts
Opinion: Tropical cirrus — From micro-scale processes to climate-scale impacts Open
Tropical cirrus clouds play a critical role in the climate system and are a major source of uncertainty in our understanding of global warming. Tropical cirrus are affected by processes spanning a wide range of spatial and temporal scales,…
View article: Systems and methods for data storage and retrieval
Systems and methods for data storage and retrieval Open
A method includes directing a probe beam to a target that includes an array of data portions in a data storage medium arranged so that a beam area of the probe beam extends across a plurality of adjacent data portions, the array including …
View article: Convective Impact on the Global Lower Stratospheric Water Vapor Budget
Convective Impact on the Global Lower Stratospheric Water Vapor Budget Open
Water vapor in the stratosphere is primarily controlled by temperatures in the tropical upper troposphere and lower stratosphere. However, the direct impact of deep convection on the global lower stratospheric water vapor budget is still a…
View article: The NOAA Stratospheric Aerosol processes, Budget and Radiative Effects (SABRE) Project
The NOAA Stratospheric Aerosol processes, Budget and Radiative Effects (SABRE) Project Open
Stratospheric aerosols are an important component of Earth’s albedo, and therefore energy balance, and provide surface area for heterogeneous chemistry, which can lead to stratospheric ozone loss. Acquiring a comprehensive database o…
View article: How much does new particle formation near the tropical tropopause contribute to stratospheric aerosol number concentration?
How much does new particle formation near the tropical tropopause contribute to stratospheric aerosol number concentration? Open
Nucleation of ultrafine aerosols near the tropical tropopause, followed by transport throughout the stratosphere by the Brewer-Dobson circulation, is thought to be the primary source of stratospheric aerosol number concentration.  How…
View article: February 2023 Medical Image of the Month: Reversed Halo Sign in the Setting of a Neutropenic Patient with Angioinvasive Pulmonary Zygomycosis
February 2023 Medical Image of the Month: Reversed Halo Sign in the Setting of a Neutropenic Patient with Angioinvasive Pulmonary Zygomycosis Open
No abstract available. Article truncated after 150 words. A 66-year-old man presented to our emergency department with fever and lethargy. A CBC demonstrated profound neutropenia with an absolute neutrophil count of <0.50x109 cells/L (crit…
View article: Deep Convective Cloud Top Altitudes at High Temporal and Spatial Resolution
Deep Convective Cloud Top Altitudes at High Temporal and Spatial Resolution Open
We describe and validate a method of calculating convective cloud top altitudes and potential temperatures up to 50° latitude at high spatial (0.25°) and temporal (3 hr) resolution. The approach uses the statistics of the CloudSat cloud ra…
View article: Analysis and Impact of the Hunga Tonga‐Hunga Ha'apai Stratospheric Water Vapor Plume
Analysis and Impact of the Hunga Tonga‐Hunga Ha'apai Stratospheric Water Vapor Plume Open
On 15 January 2022, the Hunga Tonga‐Hunga Ha'apai eruption injected SO 2 and H 2 O into the middle stratosphere. The eruption produced a persistent mid‐stratospheric sulfate aerosol and H 2 O layer mostly confined to Southern Hemisphere (S…
View article: Homogeneous Freezing Events Sampled in the Tropical Tropopause Layer
Homogeneous Freezing Events Sampled in the Tropical Tropopause Layer Open
High‐frequency (20 Hz) aircraft measurements of tropical tropopause layer (TTL) cirrus and humidity are used to examine recent homogeneous freezing ice nucleation events. Several localized regions with peak ice concentrations greater than …
View article: July 2022 Medical Image of the Month: Pulmonary Nodule in the Setting of Pyoderma Gangrenosum (PG)
July 2022 Medical Image of the Month: Pulmonary Nodule in the Setting of Pyoderma Gangrenosum (PG) Open
No abstract available. Article truncated after 150 words. A 70-year-old man presented with persistent cough productive of clear sputum which had persisted approximately 12 months after COVID-19 infection. The patient reported a more recent…
View article: July 2022 Medical Image of the Month: Pulmonary Nodule in the Setting of Pyoderma Gangrenosum (PG)
July 2022 Medical Image of the Month: Pulmonary Nodule in the Setting of Pyoderma Gangrenosum (PG) Open
No abstract available. Article truncated after 150 words. A 70-year-old man presented with persistent cough productive of clear sputum which had persisted approximately 12 months after COVID-19 infection. The patient reported a more recent…
View article: February 2022 Medical Image of the Month: Multifocal Micronodular Pneumocyte Hyperplasia in the Setting of Tuberous Sclerosis
February 2022 Medical Image of the Month: Multifocal Micronodular Pneumocyte Hyperplasia in the Setting of Tuberous Sclerosis Open
No abstract available. Article truncated at 150 words. A 22-year-old man with a known diagnosis of Tuberous Sclerosis Complex (TSC) presents for a follow-up unenhanced chest CT to re-evaluate pulmonary nodules seen in the lung bases on a p…
View article: Studies on the Competition Between Homogeneous and Heterogeneous Ice Nucleation in Cirrus Formation
Studies on the Competition Between Homogeneous and Heterogeneous Ice Nucleation in Cirrus Formation Open
Cirrus ice crystals are produced heterogeneously on ice‐nucleating particles (INPs) and homogeneously in supercooled liquid solution droplets. They grow by uptake of water molecules from the ice‐supersaturated vapor. The precursor particle…
View article: Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit Open
We report the discovery of five transiting companions near the hydrogen-burning mass limit in close orbits around main sequence stars originally identified by the Transiting Exoplanet Survey Satellite (TESS) as TESS Objects of Interest (TO…
View article: Evidence of in Situ Cirrus Formation in the Tropical Tropopause Layer over the Southwestern Indian Ocean&#160;
Evidence of in Situ Cirrus Formation in the Tropical Tropopause Layer over the Southwestern Indian Ocean  Open
<p>A nascent in situ cirrus was observed on 11 January 2019 in the tropical tropopause layer (TTL) over the southwestern Indian Ocean, with the use of balloon-borne instruments. Data from CFH (Cryogenic Frost Point Hygrometer) and CO…
View article: Unprecedented Observations of a Nascent In Situ Cirrus in the Tropical Tropopause Layer
Unprecedented Observations of a Nascent In Situ Cirrus in the Tropical Tropopause Layer Open
A nascent in situ cirrus was observed on January 11, 2019 in the tropical tropopause layer (TTL) over the southwestern Indian Ocean, with the use of balloon‐borne instruments. Data from cryogenic frost point hygrometer (CFH) and Compact Op…
View article: Influence of convection on stratospheric water vapor in the North American monsoon region
Influence of convection on stratospheric water vapor in the North American monsoon region Open
We quantify the connection between deep convective occurrence and summertime 100 hPa water vapor anomaly over the North American (NA) region and find substantial consistency between their interannual variations and also that the water vapo…
View article: Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere
Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere Open
In situ and remote sensing observations of water vapor are analyzed to assess the evidence for direct convective hydration of the lower stratosphere. We have examined several hundred balloon‐borne and airborne in situ measurements of lower…