Blar i Faculty of Mathematics and Natural Sciences på tidsskrift "Journal of Geophysical Research (JGR): Atmospheres"
Viser treff 1-20 av 32
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A 4.5 Year‐Long Record of Svalbard Water Vapor Isotopic Composition Documents Winter Air Mass Origin
(Journal article; Peer reviewed, 2020)From May 2014 to September 2018, a laser spectrometer analyzer provided a 4.5 years continuous record of water vapor isotopic composition at Ny-Ålesund (8 m above sea level, a.s.l.), Svalbard. It corresponds to the longest ... -
Blue Flashes as Counterparts to Narrow Bipolar Events: The Optical Signal of Shallow In-Cloud Discharges
(Journal article; Peer reviewed, 2021)Narrow Bipolar Events (NBEs) are powerful radio emissions from thunderstorms, which have been recently associated with blue optical flashes on cloud tops and attributed to extensive streamer electrical discharges named ... -
Characterization of Thunderstorm Cells Producing Observable Terrestrial Gamma-Ray Flashes
(Journal article; Peer reviewed, 2023)The meteorological conditions required for the production of Terrestrial Gamma-ray Flashes (TGFs) are not well understood. Particularly, the link between TGF production, meteorology, and weather severity is poorly characterized ... -
Different Types of Corona Discharges Associated With High-Altitude Positive Narrow Bipolar Events Nearby Cloud Top
(Journal article; Peer reviewed, 2023)Single- and multi-pulse blue corona discharges are frequently observed in thunderstorm clouds. Although we know they often correlate with Narrow Bipolar Events (NBEs) in Very Low Frequency/Low Frequency radio signals, their ... -
The Dominant Role of Brewer-Dobson Circulation on 17O-Excess Variations in Snow Pits at Dome A, Antarctica
(Journal article; Peer reviewed, 2022)Recent studies have suggested that water isotopologues in snow pits from remote East Antarctica can be influenced by the input of stratospheric water, which has anomalously high 17O-excess values. However, it remains unclear ... -
Evaluation of Temperature-Dependent Complex Refractive Indices of Supercooled Liquid Water Using Downwelling Radiance and In-Situ Cloud Measurements at South Pole
(Journal article; Peer reviewed, 2022)Clouds have a large effect on the radiation budget and represent a major source of uncertainty in climate models. Supercooled liquid clouds can exist at temperatures as low as 235 K, and the radiative effect of these clouds ... -
Evaluation of three numerical weather prediction models for the Weddell Sea region for the Austral winter 2013
(Journal article; Peer reviewed, 2021)It is widely recognized that numerical weather prediction (NWP) results for the Antarctic are relatively poor compared to the mid-latitudes. In this study, we evaluate output from three operational NWP systems: the ECMWF, ... -
Future Projections of EURO-CORDEX Raw and Bias-Corrected Daily Maximum Wind Speeds Over Scandinavia
(Journal article; Peer reviewed, 2023)Twenty historical and future Coordinated Regional Climate Downscaling Experiment ensemble for Europe simulations are bias corrected to investigate the future changes in the daily maximum wind speed over Scandinavia. We use ... -
Global Distribution of Key Features of Streamer Corona Discharges in Thunderclouds
(Journal article; Peer reviewed, 2022)We present nighttime worldwide distributions of key features of Blue LUminous Events (BLUEs) detected by the Modular Multispectral Imaging Array of the Atmosphere-Space Interaction Monitor. Around 10% of all detected BLUEs ... -
Height Determination of a Blue Discharge Observed by ASIM/MMIA on the International Space Station
(Journal article; Peer reviewed, 2023)We analyze simultaneous photometric observations of thundercloud discharges from the Modular Multispectral Imaging Array of the Atmosphere-Space Interactions Monitor (ASIM) on board the International Space Station with ... -
Impact of Snow Initialization in Subseasonal‐to‐Seasonal Winter Forecasts With the Norwegian Climate Prediction Model
(Peer reviewed; Journal article, 2019)Snow initialization has been previously investigated as a potential source of predictability atthe subseasonal‐to‐seasonal (S2S) timescale in winter and spring, through its local radiative,thermodynamical, and hydrological ... -
Impacts of Greenland Block Location on Clouds and Surface Energy Fluxes over the Greenland Ice Sheet
(Journal article; Peer reviewed, 2020)Clouds and blocking activity have been implicated as causes of increased Greenland Ice Sheet (GrIS) melt in the 21st century. Although Greenland blocks (i.e., long-lasting, mostly stationary anticyclones) generally reduce ... -
Influence of Enhanced Planetary Wave Activity on the Polar Vortex Enhancement Related to Energetic Electron Precipitation
(Journal article; Peer reviewed, 2020)The Northern polar vortex experiences considerable interannual variability, which is also reflected to tropospheric weather. Recent research has established a link between polar vortex variations and energetic electron ... -
An Intensity and Size Phase Space for Tropical Cyclone Structure and Evolution
(Journal article; Peer reviewed, 2023)Intensity and size are important to characterize a tropical cyclone (TC), but there are a wide variety of ways that both metrics are defined. TC intensity can refer to either a maximum sustained wind speed at some height ... -
Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations
(Journal article; Peer reviewed, 2023)Gamma-Ray Glows (GRGs) are high energy radiation originating from thunderclouds, in the MeV energy regime, with typical duration of seconds to minutes, and sources extended over several to tens of square kilometers. GRGs ... -
Linking Sub-Tropical Evaporation and Extreme Precipitation Over East Antarctica: An Atmospheric River Case Study
(Journal article; Peer reviewed, 2021)We investigate an intense snowfall event between 15 and 18 February 2011 over the East Antarctic coastal region which contributed to roughly 24% of the annual snow accumulation. The event was previously associated with an ... -
Non-Equilibrium Fractionation Factors for D/H and 18O/16O During Oceanic Evaporation in the North-West Atlantic Region
(Journal article; Peer reviewed, 2022)Ocean isotopic evaporation models, such as the Craig-Gordon model, rely on the description of nonequilibrium fractionation factors that are, in general, poorly constrained. To date, only a few gradient-diffusion type ... -
Observation of Terrestrial Gamma-Ray Flashes at Mid Latitude
(Journal article; Peer reviewed, 2021)We present a sample of Terrestrial Gamma-ray Flashes (TGFs) observed at mid latitudes by the Atmosphere Space Interaction Monitor (ASIM). The events were detected between June 2018 and August 2020 in the latitude bands ... -
Observational and Model Impact of Tonga Volcano Eruption on Schumann Resonance
(Journal article; Peer reviewed, 2023)Tonga volcano eruption on 15 January 2022 was accompanied by an unprecedentedly high lightning activity in the volcano plume which significantly exceeded the lightning activity level of the whole globe. We compare model ... -
On the High‐Energy Spectral Component and Fine Time Structure of Terrestrial Gamma Ray Flashes
(Journal article; Peer reviewed, 2019)Terrestrial gamma ray flashes (TGFs) are very short bursts of gamma radiation associated to thunderstorm activity and are the manifestation of the highest‐energy natural particle acceleration phenomena occurring on Earth. ...