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Characterize Basin-Scale Subsurface Using Rocket-Triggered Lightning

  •  2 December 2022

Key Points

  • An efficient 3-D forward and inverse model based on the temporal moment is developed to solve Maxwell’s equations in random parameter fields

  • Triggered lightning tomography yields an excellent subsurface electric conductivity spatial distribution in a basin of several kilometers

  • Deep lightning rods in the subsurface improve vertical resolution and depth of investigation

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Robust Seismic Images of the Hawaiian Plume

  •  1 December 2022

Key Points

  • A robust 3-D Vs model beneath Hawaii is obtained by inverting three kinds of seismic data

  • The Hawaiian plume is imaged as a continuous low-Vs zone down to ∼700 km depth

  • Our results reveal the Pacific lithosphere dragging plume, rejuvenation and re-aging

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Joint Geodynamic-Geophysical Inversion Suggests Passive Subduction and Accretion of the Ontong Java Plateau

  •  1 December 2022

Key Points

  • The joint geodynamic-geophysical inversion approach can help distinguish ambiguous dynamic behaviors of oceanic plateau subduction

  • The Bouguer gravity and other observations of Ontong Java Plateau (OJP) favor the passive collision model over the active collision model

  • OJP should have played a passive role in the collision process, implying the overestimation in previous studies

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MAVEN Proton Observations Near the Martian Moon Phobos: Does Phobos Backscatter Solar Wind Protons?

  •  1 December 2022

Key Points

  • Mars Atmosphere and Volatile EvolutioN mission (MAVEN) flew by Phobos 15 times at a distance lower than 370 km

  • We find no evidence of solar wind protons backscattered by the surface of Phobos in the MAVEN proton measurements

  • Foreshock—shock foot protons and exospheric pickup protons are often detected and can be misidentified as solar wind backscattered protons

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Tropospheric Ozone During the Last Interglacial

  •  1 December 2022

Key Points

  • Clumped isotopes of tropospheric oxygen are less abundant during the Last Interglacial than during the late pre-industrial Holocene

  • The clumped-isotope data indicate less tropospheric ozone in the Last Interglacial than the pre-industrial Holocene

  • Larger pre-industrial tropospheric ozone burden is compatible with elevated biomass burning after late-Pleistocene megafaunal extinctions

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The Delayed Response of the Troposphere-Stratosphere-Mesosphere Coupling to the 2019 Southern SSW

  •  30 November 2022

Key Points

  • A rare Southern Hemisphere sudden stratospheric warming event occurred in September 2019 and contributed to the early onset of polar mesospheric clouds in November

  • The downward propagation of the zonal wind anomaly affects the propagation of planetary waves (PWs) by modulating barotropic/baroclinic instability

  • The secondary enhanced upward propagation of the PWs causes a delayed response in both the polar stratosphere and mesosphere

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Issue Information

  •  29 November 2022
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Global Recharge Data Set Indicates Strengthened Groundwater Connection to Surface Fluxes

  •  29 November 2022

Key Points

  • A global recharge data set indicates that climate strongly shapes the fraction of precipitation that will recharge groundwaters

  • This recharge data set indicates more recharge globally than existing global hydrological models suggest

  • Thus, more groundwater must contribute to evaporation and streamflow than represented by current global models and water cycle diagrams

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Abrupt Drying on the Southeast Coast of China during the Mid-to-late Holocene Transition

  •  28 November 2022

Key Points

  • 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

  • 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

  • Such a shift in hydroclimate might have promoted the development of mixed rice and millet farming on the southeast coast of China

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Surface-to-ocean exchange by the sinking of impact generated melt chambers on Europa

  •  28 November 2022

Key Points

  • Impacts into ice shells generate melt chambers that viciously deform and sink through the ice shell, likely modifying crater morphologies

  • If transient cavity depth exceeds half the ice thickness, impact melts drain to the ocean and may deliver oxidants needed for habitability

  • Draining impact melts form a stable porous channel that connects the ocean to near-surface and may allow for the escape of ocean fluids

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Silent Very Long Period Seismic Events (VLPs) at Stromboli Volcano, Italy

  •  28 November 2022

Key Points

  • Seismo-acoustic observations from Stromboli in 2018 show hundreds of repeating VLP seismic signals without corresponding acoustic signals

  • VLPs without explosions suggest the slug model is a poor fit for ”normal” activity at Stromboli

  • We suggest VLPs may instead result from large gas bubbles interacting with a semi-permeable solid plug

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Shallow Fracture Buffers High Elevation Runoff in Northwest Greenland

  •  28 November 2022

Key Points

  • We identify extensive meltwater infiltration and refreezing beneath low-permeability ice slabs in Northwest Greenland

  • These buried ice complexes form where supraglacial lakes or streams drain through shallow surface crevasses into the relict firn

  • This process reduces ice-slab induced runoff and limits the immediate impact of high-elevation surface melting on ice dynamics

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Glacial isostatic adjustment shapes proglacial lakes over glacial cycles

  •  28 November 2022

Key Points

  • We self-consistently model proglacial lakes that form around the Laurentide ice sheet over the last glacial cycle

  • Glacial isostatic adjustment increases the volume and lake depth of proglacial lakes during the deglaciation compared to the glaciation

  • When the ice margin retreated over areas of low-lying topography, ice retreat was faster in areas that bordered proglacial lakes

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The impact of winds on AMOC in a fully-coupled climate model

  •  28 November 2022

Key Points

  • We nudge winds above the boundary layer towards reanalysis in a fully-coupled climate model over various spatial domains

  • Constraining winds north of 45N reduces biases in subpolar gyre surface buoyancy fluxes and AMOC at 26.5N

  • Wind-nudging experiments capture observed phasing of AMOC interannual variability at 26.5N, but underestimate variability across timescales

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Assessing predictability of marine heatwaves with random forests

  •  23 November 2022

Key Points

  • Marine heatwaves in the northeast Pacific are predictable on weekly lead times using atmospheric and oceanic conditions

  • Average accuracy at predicting marine heatwave presence/absence is 76%, but lowers to 38% when forecasting their severity

  • Machine learning approaches should be considered to augment our ability to forecast marine heatwaves

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An extratropical contribution to the signal-to-noise paradox in seasonal climate prediction

  •  23 November 2022

Key Points

  • Tropical relaxation is used to test whether the mid-latitude ‘signal-to-noise paradox’ can be removed by specifying the tropical state

  • 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

  • The results have implications for narrowing the identification of the source of the paradox

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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

  • A 1600-member ensemble simulation in total for Typhoon Faxai (2019) was performed using a 14-km mesh nonhydrostatic atmospheric model

  • The model successfully predicts the risk of Faxai's landfall in Japan two weeks in advance

  • Reproducibilities of the precursor vortex and upper-tropospheric vortex yield good prediction of the formation and track of Faxai

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Cobalamin co-limits phytoplankton and bacterial biomass and activity in Eastern Mediterranean coastal waters

  •  23 November 2022

Key Points

  • Addition of B12 increased pico/nano-eukaryotes abundance during the illuminated hours and of cyanobacteria during nighttime

  • B12 amendments accelerated NO3 uptake by phytoplankton, resulting in increased pico/nano-phytoplankton biomass and primary production

  • Phytoplankton were co-limited by NO3 and B12 while heterotrophic bacteria were co-limited by B12 and PO4

  • B12 is an important, yet overlooked, micronutrient in coastal nutrient-poor ecosystems

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