Blar i Bergen Open Research Archive på tidsskrift "Geophysical Research Letters"
Viser treff 1-20 av 97
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Analysis of Blue Corona Discharges at the Top of Tropical Thunderstorm Clouds in Different Phases of Convection
(Journal article; Peer reviewed, 2022)We report on observations of corona discharges at the uppermost region of clouds characterized by emissions in a blue band of nitrogen molecules at 337 nm, with little activity in the red band of lightning leaders at 777.4 ... -
Arctic Warming and Eurasian Cooling: Weakening and Reemergence
(Journal article; Peer reviewed, 2023)The observed Eurasian winter surface cooling from the 1990s to the early 2010s, which is contrary to global warming, has been extensively studied. Previous studies revealed that the surface cooling trend has significantly ... -
Atlantic Multidecadal Oscillation modulates the impacts of Arctic sea ice decline
(Peer reviewed; Journal article, 2018-03)The Arctic sea ice cover has been rapidly declining in the last two decades, concurrent with a shift in the Atlantic Multidecadal Oscillation (AMO) to its warm phase around 1996/1997. Here we use both observations and model ... -
Atmosphere-Snow Exchange Explains Surface Snow Isotope Variability
(Journal article; Peer reviewed, 2022)The climate signal imprinted in the snow isotopic composition allows to infer past climate variability from ice core stable water isotope records. The concurrent evolution of vapor and surface snow isotopic composition ... -
Atmospheric signature of the Agulhas current
(Journal article; Peer reviewed, 2018)Western boundary currents play an important role in the climate system by transporting heat poleward and releasing it to the atmosphere. While their influence on extratropical storms and oceanic rainfall is becoming ... -
Cancellation of the precessional cycle in δ18O records during the Early Pleistocene
(Journal article; Peer reviewed, 2021)The dominant pacing of glacial‐interglacial cycles in deep‐ocean δ18O records changed substantially during the Mid‐Pleistocene Transition. The precessional cycle (∼23 ky) is absent during the Early Pleistocene, which we ... -
The Climate Response to Emissions Reductions Due to COVID-19: Initial Results From CovidMIP
(Journal article; Peer reviewed, 2021)Many nations responded to the corona virus disease-2019 (COVID-19) pandemic by restricting travel and other activities during 2020, resulting in temporarily reduced emissions of CO2, other greenhouse gases and ozone and ... -
Collisionless Magnetic Reconnection in an Asymmetric Oxygen Density Configuration
(Journal article; Peer reviewed, 2020)Combined with the magnetic field, the distribution of charged particles in the inflow region is expected to control the rate of magnetic reconnection. This paper investigates how the reconnection process is altered by a ... -
Connecting ocean heat transport changes from the mid-latitudes to the Arctic Ocean
(Peer reviewed; Journal article, 2017-02)Under greenhouse warming, climate models simulate a weakening of the Atlantic Meridional Overturning Circulation and the associated ocean heat transport at midlatitudes but an increase in the ocean heat transport to the ... -
Constraining Spectral Models of a Terrestrial GammaRay Flash From a Terrestrial Electron Beam Observation by the Atmosphere-Space Interactions Monitor
(Journal article; Peer reviewed, 2021)Terrestrial Gamma ray Flashes (TGFs) are short flashes of high energy photons, produced by thunderstorms. When interacting with the atmosphere, they produce relativistic electrons and positrons, and a part gets bounded to ... -
Control of Barents Sea wintertime cyclone variability by large-scale atmospheric flow
(Journal article; Peer reviewed, 2020)Extratropical cyclones transport heat and moisture into the Arctic, which can promote surface warming and sea ice melt. We investigate wintertime cyclone variability in the Barents Sea region to understand what controls ... -
Crustal Conditions Favoring Convective Downward Migration of Fractures in Deep Hydrothermal Systems
(Journal article; Peer reviewed, 2023)Cooling magma plutons and intrusions are the heat sources for hydrothermal systems in volcanic settings. To explain system longevity and observed heat transfer at rates higher than those explained by pure conduction, the ... -
Current models underestimate future irrigated areas
(Journal article; Peer reviewed, 2020)Predictions of global irrigated areas are widely used to guide strategies that aim to secure environmental welfare and manage climate change. Here we show that these predictions, which range between 240 and 450 million ... -
The Cusp as a VLF Saucer Source: First Rocket Observations of Long‐Duration VLF Saucers on the Dayside
(Journal article; Peer reviewed, 2021)Auroral whistler‐mode radio emissions called saucers are of fundamental interest because they require an unusually stationary emission process in the dynamic auroral environment, and it is a mystery how that can happen in ... -
Dayside Field-Aligned Current Impacts on Ionospheric Irregularities
(Journal article; Peer reviewed, 2020)Global Navigation Satellite Systems (GNSS) are subject to disturbances caused by plasma irregularities in the ionosphere. Studies have suggested that in addition to the gradient drift and Kelvin‐Helmholtz instabilities, ... -
Decadal Predictability of the North Atlantic Eddy-Driven Jet in Winter
(Journal article; Peer reviewed, 2023)This paper expands on work showing that the winter North Atlantic Oscillation (NAO) is predictable on decadal timescales to quantify the skill in capturing the North Atlantic eddy-driven jet's location and speed. By focusing ... -
Deconstructing Future AMOC Decline at 26.5°N
(Journal article; Peer reviewed, 2023)The Atlantic Meridional Overturning Circulation (AMOC) is frequently used to diagnose the state of the North Atlantic circulation, but as an integrated quantity the AMOC strength does not necessarily mirror changes in the ... -
The Dependence of Cold and Hot Patches on Local Plasma Transport and Particle Precipitation in Northern Hemisphere Winter
(Journal article; Peer reviewed, 2022)By using a database of 4,634 cold patches (high density and low electron temperature) and 4,700 hot patches (high density and high electron temperature) from Defense Meteorological Satellite Program F16 in 2005–2018 winter ... -
Dependence of Sudden Stratospheric Warmings on Internal and External Drivers
(Journal article; Peer reviewed, 2020)A sudden stratospheric warming (SSW) is a large-scale disturbance of the wintertime stratosphere, which occurs especially in the Northern Hemisphere. Earlier studies have shown that SSW occurrence depends on atmospheric ... -
Diabatic Heating as a Pathway for Cyclone Clustering Encompassing the Extreme Storm Dagmar
(Journal article, 2020)Contrary to the general notion that extratropical cyclones reduce baroclinicity, the baroclinicity is found to be enhanced in the wake of the extreme winter storm Dagmar. Thus, individual storms can increase baroclinicity, ...