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Geophysical Research Letters: Volume 50, Issue 19
16 October 2023
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Issue Information
Research Letter
Solid Earth
Precursory Motion and Time-Of-Failure Prediction of the Achoma Landslide, Peru, From High Frequency PlanetScope Satellites
- First Published: 28 September 2023
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High frequency optical satellites can detect the acceleration precursory to the Achoma landslide failure
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The acceleration follows a Voight law, classical of the tertiary creep of materials
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The time-series of ground displacement may be used to predict the time-of-failure for pixels of total displacement larger than 5 m
Space Sciences
Non-Lightning-Generated Whistler Waves in Near-Venus Space
- First Published: 29 September 2023
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Whistler waves were observed at an altitude of 0.39 Venus radii on Venus's nightside with planetward Poynting vector
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Langmuir waves occurred simultaneously with the whistlers, suggesting electron beam driving with magnetotail origins
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Lightning is eliminated as a possible generation mechanism for these whistler waves
Solid Earth
Imaging the Spatiotemporal Evolution of Plate Coupling With Interferometric Radar (InSAR) in the Hikurangi Subduction Zone
- First Published: 03 October 2023
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Integration of high-resolution displacement maps from radar imagery captures plate coupling at fine scales
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Estimates of plate coupling depend strongly on the time period over which surface velocities are measured
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Temporal variations in plate coupling highlight when and where slow slip dominates the slip budget
Atmospheric Science
Signature of Two-Step Non-Linear Interactions Associated to Zonally Symmetric Waves During Major Sudden Stratospheric Warmings
- First Published: 29 September 2023
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Spectral analysis on meteor radar winds provides evidence of non-linear interaction between semidiurnal tide and quasi-20-day wave
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Possible role of zonal wavenumber 2 stationary planetary wave in forcing zonally symmetric 20-day wave in the stratosphere
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First observational evidence of two-step non-linear interaction associated with zonally symmetric planetary waves during major sudden stratospheric warmings
Climate
The Role of Interactive Soil Moisture in Land Drying Under Anthropogenic Warming
- First Published: 06 October 2023
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We propose a new explanation for the projected decrease in land relative humidity under anthropogenic warming
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Complex and idealized simulations show that interactive soil moisture (SM) is necessary and sufficient for anthropogenic warming to dry the land
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Interactive SM allows prior imbalance in evaporation and precipitation increases to dry the land independent of ocean influence
Space Sciences
Formation of Electron Butterfly Pitch Angle Distributions in Saturn's Magnetosphere Due To Scattering by Equatorial ECH Waves
- First Published: 29 September 2023
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We report a simultaneous equatorial electrostatic electron cyclotron harmonic (ECH) wave event with the butterfly PADs of electrons
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The Saturnian ECH waves can resonate with ∼10 eV to several keV electrons at <60° pitch angles
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The formation of ∼100 eV to ∼1 keV electron butterfly PADs is attributed to the scattering of electrons induced by ECH waves
Solid Earth
Paleomagnetism of Late Triassic Volcanic Rocks From the South Qiangtang Block, Tibet: Constraints on Longmuco-Shuanghu Ocean Closure in the Paleo-Tethys Realm
- First Published: 11 October 2023
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The South Qiangtang block was located at ∼30°N in the Late Triassic
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In the Permo-Triassic the South Qiangtang block drifted rapidly northward at ∼13.4 cm/yr
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The Longmuco-Shuanghu Ocean closed no later than ca. 222 Ma
Oceans
Dissolved Organic Radiocarbon in the West Indian Ocean
- First Published: 02 October 2023
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14C aging of deep dissolved organic carbon (DOC) northward is not similar to that of deep dissolved inorganic carbon, showing that transport of deep water is not the main control of 14C in DOC
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Variability of deep DOC 14C indicates heterogeneity in the DOC pool, perhaps by dissolution of surface-derived, particulate organic C
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Low DOC δ13C in deep water from two stations may suggest a source of chemosynthetically produced organic matter
Exploring the AMOC Connectivity Between the RAPID and OSNAP Lines With a Model-Based Data Set
- First Published: 29 September 2023
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An adiabatic link is identified between the overturning circulations across the two major trans-basin mooring sections
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Seasonality of the subpolar North Atlantic overturning circulation is likely caused by the adiabatic process downstream
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The Labrador Sea accommodates the main forcing of the adiabatic overturning variability in the subpolar gyre region
Multi-Stage Development Within Anisotropy Insight of an Anticyclone Eddy in Northwestern South China Sea in 2021
- First Published: 05 October 2023
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For 3 months, a state-of-the-art AUV monitored the development of an intra-thermocline eddy (ITE) in terms of vertical transects
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Novel anisotropy analysis was developed and revealed interactions between eddy anisotropy and mean-flow strain in barotropic instability
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The anisotropic partitioning of the ITE at different stages helped gain kinetic energy from the mean flow
Cause of Substantial Global Mean Sea Level Rise Over 2014–2016
- First Published: 10 October 2023
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Global mean sea level rose by 15 mm over June 2014 – May 2016
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80% of this rise had a mass origin (12 mm) and 20% had an ocean warming origin (3 mm)
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The terrestrial water storage change in the Amazon basin (5 mm) contributed to one third of the substantial sea level rise
Hydrology and Land Surface Studies
Drought and Waterlogging Stress Regimes in Northern Peatlands Detected Through Satellite Retrieved Solar-Induced Chlorophyll Fluorescence
- First Published: 29 September 2023
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Spaceborne Solar-Induced Fluorescence (SIF) data was used to analyze soil moisture-related vegetation stress regimes in northern peatlands
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For most locations, waterlogging as well as drought stress regimes occurred and alternated depending on peatland water level dynamics
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The SIF-based stress response observations are supported by in situ data of Gross Primary Production
Solid Earth
The Effect of Conduit Walls Roughness on Volcanic Jets and Their Seismo-Acoustic Radiation: An Experimental Investigation
- First Published: 02 October 2023
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Elastic radiation of analogue experimental volcanic subsonic to supersonic jets was compared against high-speed shadowgraph analysis
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We quantified variation in the spectral features, energy partitioning and jet structure due to differences in conduit roughness
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Different behavior in subsonic versus supersonic regime was observed due to distinct dominating noise sources at different roughness
Atmospheric Science
How Do the Convective and Microphysical Characteristics of Extreme Precipitation Over the Pearl River Delta at Monsoon Coast Vary With Increasing Rainfall Extremity?
- First Published: 28 September 2023
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With more extreme rainfall, the extreme precipitation features tend to grow in horizontal size from the meso-γ- to meso-β-scale
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Overlap between extreme precipitation and extreme convection increases substantially with more extreme rainfall
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Enhanced mixed-phase processes, larger liquid/ice water contents, slight changes in liquid-phase processes are with more extreme rainfall
Planets
Establishing a Lunar Origin for Paleomagnetic Records in Apollo Samples
- First Published: 11 October 2023
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Magnetic fields associated with spacecraft transit or certain laboratory procedures may impart lunar samples with magnetic overprints
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We find such magnetic contamination can be successfully cleaned from nearly all samples, enabling reliable paleointensity determinations
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The modern lunar paleointensity record reflects magnetization acquired on the Moon from ancient dynamo fields or impact-related fields
Hydrology and Land Surface Studies
A Simple Agent-Based Model That Reproduces All Types of Barchan Interactions
- First Published: 28 September 2023
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We present a new agent-based model for simulating barchan dune dynamics in terms of their two flanks, able to capture dune asymmetry
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With one fundamental principle of overlapping flanks, the model reproduces all known dune collision types, asymmetry phenomena, and calving
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We have mapped the phase-space of collision types as a function of initial conditions and a key lateral-flux parameter
Space Sciences
Effect of Intermittent Structures on Electron Heating in Saturn's Magnetosphere: Cassini Observations
- First Published: 10 October 2023
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Intermittent structures are identified in Saturn's magnetosphere based on partial variance of increment technique
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Electron temperature has a rising trend as the intermittency increases, indicating the occurrence of intermittent electron heating
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Turbulence heating rate increases as intermittent density rises, implying a contribution of intermittent structure to turbulence heating
Solid Earth
Seismic Reflection Imaging of a Deep-Penetrating Red River Fault in the Yinggehai Basin, Northwest of the South China Sea
- First Published: 04 October 2023
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For the first time, we image a reflected Moho cut by the Red River Fault (RRF) structure under the Yinggehai Basin (YB), South China Sea
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The RRF in the YB is inferred to be a deep-penetrating fault, most likely cutting through the Moho boundary
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The RRF was inferred to be a large-scale shear zone accommodating the Indochina Block extrusion during Oligocene-early Miocene
Hydrology and Land Surface Studies
Studying Brown Ocean Re-Intensification of Hurricane Florence Using CYGNSS and SMAP Soil Moisture Data and a Numerical Weather Model
- First Published: 09 October 2023
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We hypothesize the wet antecedent soil moisture re-intensified Hurricane Florence
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We found that Hurricane Florence was re-intensified by wet antecedent soils, leading to intense and concentrated rainfall
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We found that cold antecedent soils impair the Brown Ocean effect in Hurricane Florence
Reduced and More Fragmented Mississippi River Navigability by Rising Flow
- First Published: 10 October 2023
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We have analyzed the navigability of the Mississippi River System (MRS) since 1963
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The MRS navigability has reduced and become more fragmented in recent decades, especially in response to generally higher water levels
Oceans
Expansion of Ocean Anoxia During Glacial Periods Recorded in the Cobalt Flux to Pelagic Sediments
- First Published: 08 October 2023
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The cobalt flux to pelagic sediments reflects heightened sources associated with Oxygen Deficient Zones
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In Equatorial Pacific sediments, cobalt flux increased by ∼40% during the Last Glacial Period, compared to the Holocene
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Oxygen Deficient Zones likely expanded during the previous two glacial periods
Atmospheric Science
Warm Clouds Biases in CMIP6 Models Linked to Indirect Effects of Falling Ice-Radiation Interactions Over the Tropical and Subtropical Pacific
- First Published: 29 September 2023
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CloudSat-MODIS synthesized estimates of warm cloud liquid water path/content (CLWP/CLWC) are used to evaluate three CMIP6 model subsets
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CLWP/CLWC are simulated well with separately-calculated radiative effects of cloud ice and falling ice over subtropical and tropical Pacific
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Produce too much liquid water above 750 hPa over the trade-wind regions in subsets with cloud ice only or total frozen ice radiative effects
Climate
The Role of Bjerknes and Shortwave Feedbacks in the Tropical Pacific SST Response to Global Warming
- First Published: 29 September 2023
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Climate models predict an eastern equatorial Pacific warming pattern in the tropical Pacific by the end of the 21st century
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We use partially coupled climate simulations to assess contributions of wind stress, shortwave, and evaporative feedbacks to this pattern
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Weakening of surface wind stress is found to be a major factor leading to a reduced zonal SST gradient over the tropical Pacific
Hydrology and Land Surface Studies
How Long Do Runoff-Generated Debris-Flow Hazards Persist After Wildfire?
- First Published: 03 October 2023
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Majority (>98%) of western United States postfire debris flows occurred when leaf area index was less than 2/3 of typical prefire values
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Total recovery of vegetation not necessary to inhibit debris flows
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Remotely sensed postfire vegetation state useful to evaluate elevated debris-flow susceptibility with time
Climate
Dominant Cloud Controlling Factors for Low-Level Cloud Fraction: Subtropical Versus Extratropical Oceans
- First Published: 29 September 2023
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A novel map of dominant controlling factors for low-level oceanic cloud fraction reveals regionally varying patterns
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Subtropical and extratropical low clouds depend on stability, but the dominant stability metric varies by region, challenging models
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Surface wind speed dominates in cumulus-dominated regions, sensible heat fluxes dominate in western boundary current regions in winter
Oceans
Deepening of Southern Ocean Gateway Leads to Abrupt Onset of a Deep-Reaching Meridional Overturning Circulation
- First Published: 04 October 2023
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The shallow opening of an ocean gateway leads to an abrupt onset of a deep-reaching overturning circulation
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The deep-reaching overturning circulation is a consequence of standing meanders allowing for full-depth vertical heat transport
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Further deepening of the gateway leads to a weaker overturning due to a decrease in heat transport toward southern convection regions
Deep Learning Improves Reconstruction of Ocean Vertical Velocity
- First Published: 29 September 2023
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A deep learning (DL) based approach is developed to reconstruct the ocean vertical velocity
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Using the modeled sea surface height (SSH) as input, the DL approach outperforms the dynamic-based method
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The DL approach has the potential to improve the retrieval of real-time vertical velocity field along the SWOT swaths
Cryosphere
Perchlorate in Year-Round Antarctic Precipitation
- First Published: 03 October 2023
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Antarctic atmospheric perchlorate () concentration at different locations exhibits a clear seasonal cycle
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The highest concentration in autumn is likely related to produced in the stratosphere in spring and summer
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Major source of in spring and summer is tropospheric formation influenced by both oxidants and environmental conditions
Space Sciences
Electron-Scale Reconnecting Current Sheet Formed Within the Lower-Hybrid Wave-Active Region of Kelvin-Helmholtz Waves
- First Published: 09 October 2023
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A reconnecting electron-scale current sheet is observed by Magnetospheric Multiscale (MMS) in mixing plasma along the trailing edge of a Kelvin-Helmholtz vortex
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Realistic 2.5D fully-kinetic simulation shows reasonable agreement with MMS data
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Consistencies between the simulation and MMS indicate a temporal evolution of the reconnecting current sheet
Atmospheric Science
Sink, Source or Something In-Between? Net Effects of Precipitation on Aerosol Particle Populations
- First Published: 10 October 2023
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Precipitation can act as a source for particles of varying sizes depending on the environment, reflecting diverse underlying mechanisms
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Recycling cloud-processed material influences near-surface particle concentrations, emphasizing its relevance for climate model implementation
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Studying the time-dependent instead of total accumulated precipitation elucidates direct versus indirect effects on aerosol populations
Oceans
Quantifying the Extent of Authigenic Carbonate Formation in Shallow Marine Sediments Through a Correlation Between Carbonate Precipitation Rate and Sulfate Flux
- First Published: 29 September 2023
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Porewater parameters from 153 sites of the northern South China Sea were evaluated to quantify the extent of authigenic carbonate formation
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Rate of carbonate formation strongly correlates with diffusive flux of sulfate into sediments affected by methane diffusion
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A correlation of carbonate formation rate with sulfate flux is used to quantify most of authigenic carbonate formation in shallow sediments
Space Sciences
Simultaneous Global Ionospheric Disturbances Associated With Penetration Electric Fields During Intense and Minor Solar and Geomagnetic Disturbances
- First Published: 29 September 2023
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Simultaneous global ionospheric disturbances (SGDs) are often observed even during minor solar and geomagnetic disturbances
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SGDs occur predominately on dayside and are related to penetration electric fields (PEFs) of solar wind and geomagnetic disturbance origin
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Global GNSS networks offer a novel and effective technique for continuous PEF monitoring, providing rich data sets for further study
Oceans
Global Warming Increases Interannual and Multidecadal Variability of Subarctic Atlantic Nutrients and Biological Production in the CESM1-LE
- First Published: 03 October 2023
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Global warming reduces integrated Subarctic Atlantic biological production while increasing its interannual and multidecadal variability
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Production variability increases because wintertime surface nutrient variability increases
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Nutrient variability increases because it becomes more sensitive to variability in meridional overturning and winter mixing
Cryosphere
Ice Shelf Water Structure Beneath the Larsen C Ice Shelf in Antarctica
- First Published: 02 October 2023
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Direction and magnitude of ocean currents beneath an Larsen C ice shelf affect the ice shelf water thickness and properties
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Northward meltwater advection causes 0.052°C difference of thermal drivings with different melt rates far from and near the grounding line
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Ocean heat intrusion to ice shelf base is induced by Ekman dynamics and thermohaline interleaving by tilted isopycnals
Atmospheric Science
S-5P/TROPOMI-Derived NOx Emissions From Copper/Cobalt Mining and Other Industrial Activities in the Copperbelt (Democratic Republic of Congo and Zambia)
- First Published: 10 October 2023
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We quantified annual TROPOspheric Monitoring Instrument (TROPOMI)-derived NOx emissions from point sources corresponding to copper/cobalt mines, despite high background values
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Annual emissions from individual point sources are strongly correlated with annual production from colocated single mines, one oil refinery
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TROPOMI is relevant to monitoring air quality and mining/industrial production in remote regions where these activities are growing rapidly
The Characteristics of the Yangtze Flooding During 1998 and 2020 Based on Atmospheric Water Tracing
- First Published: 08 October 2023
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The southwest summer monsoon (SWSM)-related moisture supplies regulate the emergence of the Yangtze flooding during June–July
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Along with the flooding appearances, the moisture supplies from the Northwest Pacific to the Yangtze River valley decrease
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Stronger advective transport and in-stratus condensations of the SWSM-related moisture avail the larger flooding in 2020 than in 1998
Climate
Tropical Volcanic Eruptions and Low Frequency Indo-Pacific Variability Drive Extreme Indian Ocean Dipole Events
- First Published: 05 October 2023
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Both Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation (ENSO) show oscillatory responses for up to 8 years following strong tropical volcanic eruptions
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These eruptions induce a negative IOD followed by a positive IOD, and this response scales with eruption intensity
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Initial Interdecadal Pacific Oscillation phasing at time of eruption influences the post-eruption response via low-frequency thermocline depth modulation
Solid Earth
Receiver Function Adjoint Tomography for Three-Dimensional High-Resolution Seismic Array Imaging: Methodology and Applications in Southeastern Tibet
- First Published: 29 September 2023
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A new method of 3-D adjoint tomography for receiver function inversion is developed
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Lateral heterogeneities of crust and uppermost mantle can be well resolved by this method
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The method reveals vertically extending low-velocity zones under the Red River Fault due to mantle upwelling
Planets
The Westward Drift of Jupiter's Polar Cyclones Explained by a Center-of-Mass Approach
- First Published: 29 September 2023
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The mean westward circumpolar motion of Jupiter's northern and southern polar cyclones is analyzed and explained by the β-drift effect
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Simulations show that the “center of mass” of a group of cyclones behaves like one equivalent cyclone, moving poleward-westward under β-drift
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This center-of-mass approach is applied to the Juno data, implying that the cyclones' collective β-drift drives their observed westward drift
Cryosphere
Use of Shallow Ice Core Measurements to Evaluate and Constrain 1980–1990 Global Reanalyses of Ice Sheet Precipitation Rates
- First Published: 29 September 2023
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Net accumulation measured in shallow ice cores, adjusted for sublimation/deposition, constrains climatological precipitation over ice sheets
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ERA5 and MERRA-2 precipitation fields over Greenland are highly correlated (r2 > 0.95) with in situ measurements of net accumulation
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Other widely used reanalyses (WFDE5, CRUNCEP, and GSWP3) are unfit for studies of ice sheet surface mass balance
Hydrology and Land Surface Studies
Groundwater's Fingerprint in Stream Network Branching Angles
- First Published: 06 October 2023
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Stream network branching angles vary systematically with the degree to which streams lose water to, or gain water from, nearby aquifers
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Stream branching angles correlate more strongly with streams' losing/gaining status than with other controls on stream network geometry
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These continental-scale observations highlight the potential contribution of groundwater to the development of drainage patterns
Climate
Plio-Pleistocene Southwest African Hydroclimate Modulated by Benguela and Indian Ocean Temperatures
- First Published: 29 September 2023
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Plio-Pleistocene changes in the hydrogen stable isotopic signature of leaf waxes from Southern Africa are linked to Benguela temperatures
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Higher frequency shifts in the record are likely driven by Indian Ocean temperatures via a mechanism observed in the modern
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Isotope-enabled simulations suggest that capturing this mechanism may be key to accurately simulating past and future regional hydroclimate
Atmospheric Science
The Influence of Internal Climate Variability on Stratospheric Water Vapor Increases After Large-Magnitude Explosive Tropical Volcanic Eruptions
- First Published: 11 October 2023
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Aerosol-induced absorptive-heating increases stratospheric water vapor (SWV) by up to 17% at 18 months post-eruption in a Pinatubo-like experiment
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Analyzing simulations by El Niño–Southern Oscillation (ENSO) variability show an 80% larger peak SWV increase occurs if an eruption is followed by a La Niña phase
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The timing of peak SWV increase occurs when volcanic-aerosol-induced heating reaches the tropopause, with ENSO modulation of tropical upwelling
Global Winds Shape Planetary-Scale Lamb Waves
- First Published: 10 October 2023
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A augmented model is proposed to simulate the propagation of planetary scale Lamb waves, incorporating wind, temperature and topography
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Winds play a primary role shaping Lamb waves in the far field, especially near the antipode of the source
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The augmented Lamb wave model will help better assess far-field volcanic tsunami hazards
Tropical Cyclone Fullness and Outer Region Size Growth: The Role of Spatial Distribution of Very Deep Convection
- First Published: 02 October 2023
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Tropical cyclone fullness can serve as a reliable indicator of the distribution of very deep convection
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Storms with lower fullness have a higher mean R34 growth rate over a 24-hr period
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More intense convection occurred around R34 in storms with lower fullness, which promotes the growth of R34
Carbonyl Sulfide (OCS) in the Upper Troposphere/Lowermost Stratosphere (UT/LMS) Region: Estimates of Lifetimes and Fluxes
- First Published: 02 October 2023
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Carbonyl sulfide (OCS) atmospheric lifetime of 2.1 ± 1.3 years and lowermost stratospheric lifetime of 47 ± 16 years were determined
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Total flux of OCS into the stratosphere estimated as 137 GgS a−1, of which 60% is estimated to be transported back into the troposphere
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The lower back transport estimate might explain the current missing stratospheric sulfate aerosol burden
Increasing Fire Weather Potential Over Northeast China Linked to Declining Bering Sea Ice
- First Published: 05 October 2023
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The escalation of fire in Northeast China during the past decade is strongly linked with the decline of Bering Sea ice concentration
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Weakened vertical wind shear, the high-pressure center and northerly winds induced by warmer Bering Sea might explain the teleconnection
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This linkage could potentially be intensified in a warmer world
Space Sciences
Trapped and Leaking Energetic Particles in Injection Flux Tubes of Saturn's Magnetosphere
- First Published: 05 October 2023
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In Saturn's injection flux tubes, charged particles often show distinct energy-dispersive or dispersionless signals depending on pitch angle
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The unexpected, energy-dispersionless features for perpendicular-moving particles are formed by their trapping motion within the flux tubes
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The bouncing particles can hardly be trapped, and therefore, exhibit the characteristic energy dispersion and particle leaking signatures
Interplay of Three-Dimensional Instabilities and Magnetic Reconnection in the Explosive Onset of Magnetospheric Substorms
- First Published: 05 October 2023
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For the first time, an exact kinetic magnetotail equilibrium is used to model magnetospheric substorm onset
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Comparing 2D and 3D simulations reveals the importance of the coupling between magnetic reconnection and the kinetic ballooning instability
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Self-consistent particle trajectories are analyzed for the first time in a realistic fully kinetic magnetotail configuration
Solid Earth
Earthquake Nucleation Characteristics Revealed by Seismicity Response to Seasonal Stress Variations Induced by Gas Production at Groningen
- First Published: 02 October 2023
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An improved reservoir, geomechanical, and seismicity modeling workflow is proposed for forecasting induced seismicity at various timescales
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Short-timescale stress variations allow constraining the characteristics of the earthquake nucleation process using Groningen as case study
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Initial strength excess and finite duration of the nucleation process allow reproducing long-and-short timescale characteristics of seismicity
Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin
- First Published: 28 September 2023
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A large-scale, south-flowing fluvial system drained through the Ninglang Basin during the middle Eocene
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The demise of the Ninglang Basin in the late Eocene resulted from the uplift of the Yalong-Yulong thrust belt
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The elevated terrain of eastern Tibet was initially formed in the late Eocene