Browse Articles
Characterize Basin-Scale Subsurface Using Rocket-Triggered Lightning
-  2 December 2022
Key Points
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An efficient 3-D forward and inverse model based on the temporal moment is developed to solve Maxwell’s equations in random parameter fields
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Triggered lightning tomography yields an excellent subsurface electric conductivity spatial distribution in a basin of several kilometers
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Deep lightning rods in the subsurface improve vertical resolution and depth of investigation
Robust Seismic Images of the Hawaiian Plume
-  1 December 2022
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A robust 3-D Vs model beneath Hawaii is obtained by inverting three kinds of seismic data
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The Hawaiian plume is imaged as a continuous low-Vs zone down to ∼700 km depth
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Our results reveal the Pacific lithosphere dragging plume, rejuvenation and re-aging
Joint Geodynamic-Geophysical Inversion Suggests Passive Subduction and Accretion of the Ontong Java Plateau
-  1 December 2022
Key Points
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The joint geodynamic-geophysical inversion approach can help distinguish ambiguous dynamic behaviors of oceanic plateau subduction
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The Bouguer gravity and other observations of Ontong Java Plateau (OJP) favor the passive collision model over the active collision model
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OJP should have played a passive role in the collision process, implying the overestimation in previous studies
MAVEN Proton Observations Near the Martian Moon Phobos: Does Phobos Backscatter Solar Wind Protons?
-  1 December 2022
Key Points
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Mars Atmosphere and Volatile EvolutioN mission (MAVEN) flew by Phobos 15 times at a distance lower than 370 km
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We find no evidence of solar wind protons backscattered by the surface of Phobos in the MAVEN proton measurements
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Foreshock—shock foot protons and exospheric pickup protons are often detected and can be misidentified as solar wind backscattered protons
Tropospheric Ozone During the Last Interglacial
-  1 December 2022
Key Points
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Clumped isotopes of tropospheric oxygen are less abundant during the Last Interglacial than during the late pre-industrial Holocene
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The clumped-isotope data indicate less tropospheric ozone in the Last Interglacial than the pre-industrial Holocene
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Larger pre-industrial tropospheric ozone burden is compatible with elevated biomass burning after late-Pleistocene megafaunal extinctions
The Delayed Response of the Troposphere-Stratosphere-Mesosphere Coupling to the 2019 Southern SSW
-  30 November 2022
Key Points
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A rare Southern Hemisphere sudden stratospheric warming event occurred in September 2019 and contributed to the early onset of polar mesospheric clouds in November
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The downward propagation of the zonal wind anomaly affects the propagation of planetary waves (PWs) by modulating barotropic/baroclinic instability
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The secondary enhanced upward propagation of the PWs causes a delayed response in both the polar stratosphere and mesosphere
Global Recharge Data Set Indicates Strengthened Groundwater Connection to Surface Fluxes
-  29 November 2022
Key Points
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A global recharge data set indicates that climate strongly shapes the fraction of precipitation that will recharge groundwaters
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This recharge data set indicates more recharge globally than existing global hydrological models suggest
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Thus, more groundwater must contribute to evaporation and streamflow than represented by current global models and water cycle diagrams
Abrupt Drying on the Southeast Coast of China during the Mid-to-late Holocene Transition
-  28 November 2022
Key Points
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Increasing aridity on the southeast coast of China from 4.7 to 3.8 ka captured by the hydrogen isotope compositions (δD) of leaf waxes
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The abrupt drying is mainly shaped by a more El Niño-like state over the tropical Pacific Ocean during the mid-to-late Holocene transition
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Such a shift in hydroclimate might have promoted the development of mixed rice and millet farming on the southeast coast of China
Surface-to-ocean exchange by the sinking of impact generated melt chambers on Europa
-  28 November 2022
Key Points
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Impacts into ice shells generate melt chambers that viciously deform and sink through the ice shell, likely modifying crater morphologies
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If transient cavity depth exceeds half the ice thickness, impact melts drain to the ocean and may deliver oxidants needed for habitability
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Draining impact melts form a stable porous channel that connects the ocean to near-surface and may allow for the escape of ocean fluids
Silent Very Long Period Seismic Events (VLPs) at Stromboli Volcano, Italy
-  28 November 2022
Key Points
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Seismo-acoustic observations from Stromboli in 2018 show hundreds of repeating VLP seismic signals without corresponding acoustic signals
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VLPs without explosions suggest the slug model is a poor fit for ”normal” activity at Stromboli
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We suggest VLPs may instead result from large gas bubbles interacting with a semi-permeable solid plug
Shallow Fracture Buffers High Elevation Runoff in Northwest Greenland
-  28 November 2022
Key Points
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We identify extensive meltwater infiltration and refreezing beneath low-permeability ice slabs in Northwest Greenland
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These buried ice complexes form where supraglacial lakes or streams drain through shallow surface crevasses into the relict firn
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This process reduces ice-slab induced runoff and limits the immediate impact of high-elevation surface melting on ice dynamics
Glacial isostatic adjustment shapes proglacial lakes over glacial cycles
-  28 November 2022
Key Points
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We self-consistently model proglacial lakes that form around the Laurentide ice sheet over the last glacial cycle
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Glacial isostatic adjustment increases the volume and lake depth of proglacial lakes during the deglaciation compared to the glaciation
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When the ice margin retreated over areas of low-lying topography, ice retreat was faster in areas that bordered proglacial lakes
The impact of winds on AMOC in a fully-coupled climate model
-  28 November 2022
Key Points
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We nudge winds above the boundary layer towards reanalysis in a fully-coupled climate model over various spatial domains
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Constraining winds north of 45N reduces biases in subpolar gyre surface buoyancy fluxes and AMOC at 26.5N
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Wind-nudging experiments capture observed phasing of AMOC interannual variability at 26.5N, but underestimate variability across timescales
Assessing predictability of marine heatwaves with random forests
-  23 November 2022
Key Points
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Marine heatwaves in the northeast Pacific are predictable on weekly lead times using atmospheric and oceanic conditions
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Average accuracy at predicting marine heatwave presence/absence is 76%, but lowers to 38% when forecasting their severity
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Machine learning approaches should be considered to augment our ability to forecast marine heatwaves
An extratropical contribution to the signal-to-noise paradox in seasonal climate prediction
-  23 November 2022
Key Points
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Tropical relaxation is used to test whether the mid-latitude ‘signal-to-noise paradox’ can be removed by specifying the tropical state
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This is found not to be the case, implying that at least part of the paradox is due to errors in simulating processes in the extratropics
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The results have implications for narrowing the identification of the source of the paradox
Large ensemble simulation for investigating predictability of precursor vortices of Typhoon Faxai in 2019 with a 14-km mesh global nonhydrostatic atmospheric model
-  23 November 2022
Key Points
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A 1600-member ensemble simulation in total for Typhoon Faxai (2019) was performed using a 14-km mesh nonhydrostatic atmospheric model
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The model successfully predicts the risk of Faxai's landfall in Japan two weeks in advance
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Reproducibilities of the precursor vortex and upper-tropospheric vortex yield good prediction of the formation and track of Faxai
Cobalamin co-limits phytoplankton and bacterial biomass and activity in Eastern Mediterranean coastal waters
-  23 November 2022
Key Points
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Addition of B12 increased pico/nano-eukaryotes abundance during the illuminated hours and of cyanobacteria during nighttime
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B12 amendments accelerated NO3 uptake by phytoplankton, resulting in increased pico/nano-phytoplankton biomass and primary production
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Phytoplankton were co-limited by NO3 and B12 while heterotrophic bacteria were co-limited by B12 and PO4
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B12 is an important, yet overlooked, micronutrient in coastal nutrient-poor ecosystems
Increase in Compound Drought and Heatwaves in a Warming World
- Geophysical Research Letters
-  8 December 2020
Hydrogen Wettability of Sandstone Reservoirs: Implications for Hydrogen Geo-Storage
- Geophysical Research Letters
-  11 December 2020
A Unified Clumped Isotope Thermometer Calibration (0.5–1,100°C) Using Carbonate-Based Standardization
- Geophysical Research Letters
-  15 March 2021
The Color of Rivers
- Geophysical Research Letters
-  6 December 2020
Spatial Patterns and Drivers of Nonperennial Flow Regimes in the Contiguous United States
- Geophysical Research Letters
-  14 December 2020
COVID-19 Crisis Reduces Free Tropospheric Ozone Across the Northern Hemisphere
- Geophysical Research Letters
-  9 February 2021
Distributed Global Debris Thickness Estimates Reveal Debris Significantly Impacts Glacier Mass Balance
- Geophysical Research Letters
-  22 March 2021
Historical and Projected Changes in the Southern Hemisphere Surface Westerlies
- Geophysical Research Letters
-  20 January 2021
Differing Mechanisms of New Particle Formation at Two Arctic Sites
- Geophysical Research Letters
-  28 December 2020
Global Propagation of Ionospheric Disturbances Associated With the 2022 Tonga Volcanic Eruption
- Geophysical Research Letters
-  25 March 2022
The First Seasonal Snowfall Impacts Plant Photosynthesis and Monoterpene Emissions
- Geophysical Research Letters
-  23 November 2022
Localized Origin at the Core-Mantle Boundary of the 1969 Geomagnetic Impulse
- Geophysical Research Letters
-  23 November 2022
Yield Estimation of the August 2020 Beirut Explosion by Using Physics-Based Propagation Simulations of Regional Infrasound
- Geophysical Research Letters
-  23 November 2022
An extratropical contribution to the signal-to-noise paradox in seasonal climate prediction
- Geophysical Research Letters
-  23 November 2022
Accelerated accumulation of anthropogenic CO2 drives rapid acidification in the North Pacific subtropical mode water during 1993−2020
- Geophysical Research Letters
-  23 November 2022
Large ensemble simulation for investigating predictability of precursor vortices of Typhoon Faxai in 2019 with a 14-km mesh global nonhydrostatic atmospheric model
- Geophysical Research Letters
-  23 November 2022
Does Uranus’ asymmetric magnetic field produce a relatively weak proton radiation belt?
- Geophysical Research Letters
-  23 November 2022
Cobalamin co-limits phytoplankton and bacterial biomass and activity in Eastern Mediterranean coastal waters
- Geophysical Research Letters
-  23 November 2022
Mapping Vertical Land Motion in Challenging Terrain: Six-Year Trends on Tutuila Island, American Samoa, with PS-InSAR, GPS, Tide Gauge, and Satellite Altimetry Data
- Geophysical Research Letters
-  23 November 2022