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    Disciplines / Research questions

    Earth science

    48 research topics · 161 questions

    Driving Forces of Plate Tectonic Movement2 questions

    1. Basal traction versus slab pull as the driver of protracted continental collisions (Alps, Zagros, Himalaya)

    2. Robustness of the slab-pull versus pressure-driven asthenosphere-flow balance, and the extent of tectonic bistability, in plate-generating mantle convection models with realistic non-Newtonian rheology

    Mechanisms and Prediction Studies of Heavy Rain Disasters1 questions

    1. Beyond initial-condition errors: practical predictability limits and convection-allowing ensemble design for warm-sector torrential rainfall in the South China monsoon region

    Why Do Alluvial Rivers Become Meandering?7 questions

    1. Initiation and sustenance of river meandering in an initially straight alluvial channel: alternate-bar instability versus external curvature forcing

    2. What determines the equilibrium sinuosity of a meandering alluvial river: testing the cascade-like energy dissipation mechanism against independent evidence

    3. What sets the downstream sinuosity profile of lowland alluvial rivers near their outlets: testing the meandering-avulsion pace-competition hypothesis

    4. Verifying sediment supply as the driver of meander migration, cutoff, and floodplain sediment storage in the Amazon Basin

    5. Quantitative dynamics of the self-constraining feedback in low-energy meandering rivers: temporal trajectories, the conjectured threshold hysteresis, and boundary conditions

    6. What initiates upstream-rotating meanders: isolating low sediment supply and slow point-bar growth from alternative mechanisms in Amazonian rivers

    7. Onset of meandering of a straight alluvial river: verification of the counter-rotating macro-turbulent-eddy mechanism and predictive foundation of the onset criterion

    Magnetosphere-Ionosphere-Atmosphere Coupling1 questions

    1. Mechanism and magnitude of the ionospheric field-aligned-current response to cusp–flux-transfer-event reconnection

    Wave-Particle Interactions in Magnetospheric Space2 questions

    1. Nonlinear radiation belt electron–chorus interactions with realistic wave packets: predicting the nonlinear-regime map and scattering statistics, and incorporating them into transport models

    2. Quantifying EMIC wave-driven loss of ultra-relativistic electrons in Earth's radiation belts: storm-level dominance, wave climatology, and diffusion parameterization

    The niobium (Nb\mathrm{Nb})–tantalum (Ta\mathrm{Ta}) puzzle in continental crust formation4 questions

    1. The missing high-Nb/Ta reservoir of the bulk silicate Earth: what balances Earth's subchondritic niobium/tantalum ratio

    2. Closing the silicate Earth's niobium budget: delaminated amphibole-rich arc cumulates, hidden high-Nb/Ta reservoirs, and the unresolved Nb paradox

    3. Rutile-controlled Nb/Ta fractionation in arc magma differentiation and the quantitative arclogite budget of the continents

    4. Closing the terrestrial Nb–Ta mass balance: are rutile-bearing arc-root cumulates volumetrically sufficient for the low Nb/Ta of the continental crust, and what reservoir balances the subchondritic Nb/Ta of the bulk silicate Earth?

    Tectonics of Mantle Plumes and Their Verification2 questions

    1. Seismic detectability of thermochemical deep-mantle plumes: what traveltime and waveform signatures distinguish plumes from imaging artifacts, and can advanced methods overcome sparse data coverage at hotspots?

    2. Origins of the relative motions of the long-lived Hawaiian, Louisville, and Rurutu mantle plumes: the 60-50 Ma Hawaiian plume drift, deep plume-root mobility, and the incomplete Rurutu record

    Role of Fluids in Earth's Layered Structure1 questions

    1. Quantifying dehydration melting at the top of the lower mantle: water partitioning, hydrous-melt fate, seismic attribution, and the transition-zone water filter hypothesis

    Geospace electric current systems4 questions

    1. Growth-phase BzB_z hump conditions and the quantitative fidelity of data-mining-based global empirical reconstructions of magnetospheric substorms

    2. Source attribution and transmission physics of global ionospheric disturbance current systems driven by penetration electric fields, solar wind pressure impulses, substorms, and ULF waves

    3. Global extension of joint ground-satellite separation of fast-varying ionospheric, magnetospheric, and induced geomagnetic fields, and its use in 3-D mantle-conductivity inversion

    4. Ionospheric current sources of storm-time geomagnetically induced currents: auroral-equatorial coupling during sudden impulses, ~100 km localized structures, and turbulent IMF fluctuations

    Translational Oscillations of the Earth's Inner Core2 questions

    1. Closure of the damping budget of inner-core translational (Slichter) oscillations: inner-core anelasticity, stable stratification, and Ohmic dissipation with constrained inner-core-boundary parameters

    2. Finite-rate phase-transformation kinetics at the inner-core boundary and the Slichter translational eigenperiod

    When Did Life Begin on Earth?4 questions

    1. Origin of the ~3.7 Ga Isua (Greenland) carbonate structures: Earth's oldest stromatolites or post-depositional deformation features?

    2. Biogenic or abiotic? The origin of isotopically light graphite in the 4.1 Ga Jack Hills zircon and the Hadean carbon isotope record

    3. Open questions on the biogenic graphite of the ≥3.7 Ga Isua supracrustal belt: metamorphic isotope overprint, precursor nature, palaeoecological extent, and abiotic–biogenic discrimination

    4. How the cellular systems of the last universal common ancestor were assembled: the pathway, environment, and membrane composition of the transition from origin-of-life chemistry to the LUCA population

    When Were the Oldest Rocks on Earth Formed?3 questions

    1. Hadean crust or Eoarchean inheritance: the age of the Nuvvuagittuq Supracrustal Belt and the origin of its ¹⁴²Nd anomalies

    2. High-precision U–Pb geochronology of the Eoarchean Iqaluk Gneiss and a direct depositional age for the Nulliak supracrustal assemblage, Saglek Block, northern Labrador

    3. Origin of the negative initial εHf\varepsilon\mathrm{Hf} in Earth's oldest evolved rocks — the ~4.02 Ga Idiwhaa gneisses of the Acasta Gneiss Complex — and their implications for whether the Hadean Earth was dominated by mafic crust or included significant amounts of continental crust

    Deep Supercritical Fluids of the Earth4 questions

    1. Quantitative constraints on supercritical fluid generation, percolation, and electrical conductivity in the roof of stagnant slabs in the mantle transition zone

    2. Experimental and thermodynamic determination of the liquid–vapor topology of binary silicate–H₂O systems and the physical properties of supercritical silicate-bearing fluids at deep-crust and upper-mantle conditions

    3. Determining the water-saturated solidus and second critical endpoint of the peridotite–H2O system at upper-mantle pressures, and testing the deep hydrous partial-melting-zone model of magma genesis in the mantle wedge

    4. Validated molecular-level description of NaCl dissociation, ion clustering, and solvent response in supercritical aqueous fluids across the salinity range

    The End of Earth's Ecosystem: How Much Time Do We Have Left?2 questions

    1. Unresolved controls on the timing and trajectory of Earth's terminal atmospheric deoxygenation

    2. Future lifespan and kill mechanism of Earth's terrestrial biosphere under a brightening Sun: constraining the planetary silicate-weathering response (TeT_{\mathrm{e}}, β\beta) and the dimensionality of coupled climate-carbon-vegetation modeling

    Geobiology and microbial geological processes4 questions

    1. Microbially enhanced basalt weathering: identifying the dominant acidification mechanism, the mineral-scale dissolution pathway, and the field-scale relevance of the batch enhancement reported by Wu et al. (2007)

    2. Global prevalence, time scales, and quantitative significance of the geologically mediated subsurface microbial dispersal loop

    3. The basal power limit for life in marine subseafloor sediments: how do microbial communities persist at extremely low energy fluxes?

    4. Mechanism and diagenetic fate of the microbially influenced Mg-silicate and dolomite mineralisation pathway in Great Salt Lake microbialites

    Determination of Underground Absolute Stress Magnitudes3 questions

    1. Objective, compliance-corrected hydraulic-fracturing stress determination and stress–hydraulic coupling in fractured crystalline rock: open questions from the Xinjiang HLW candidate-area campaign (Zhao et al., 2015)

    2. Reconciling discrepant in-situ stress magnitudes from borehole breakouts, core discing, and hydraulic fracturing: quantifying method-specific bias at borehole Blanche-1 (Olympic Dam HDR site) and testing the stress state to 4-5 km reservoir depth

    3. Tightening the energy-balance bound on absolute crustal stress and quantifying pore-fluid-pressure control of aftershock triggering for the 2016 Kumamoto earthquake sequence

    Causes of Large-scale Marine Organic Matter Accumulation Events in Geological Historical Periods2 questions

    1. Quantitative constraints and mechanistic coupling of organic matter sulfurization as a driver of organic carbon burial during Ocean Anoxic Event 2

    2. Quantitative attribution of the drivers of deoxygenation and organic-carbon burial during the Toarcian Oceanic Anoxic Event (Early Jurassic)

    Study on the characteristics and causes of unique climate changes in East Asia2 questions

    1. Detection and attribution of anthropogenic influence on East Asian summer monsoon rainfall: seasonal totals and extreme-event duration structure

    2. Disentangling the mechanisms of the East Asian springtime rainfall dipole and its response to combined greenhouse warming and declining anthropogenic aerosols

    How much room for improvement in El Niño prediction capability?2 questions

    1. Validating and attributing long-lead climate-network ENSO early-warning skill: benchmark sensitivity, generalization, and La Niña extension

    2. Extending event-resolved information-theoretic predictability of ENSO complexity to realistic coupled models: ensemble-size, Gaussian-approximation, data-assimilation, model-error, and multi-model frontiers

    Distributed Hydrological Model3 questions

    1. A principled, transferable criterion for spatial discretization in distributed hydrological models

    2. Systematic rules and criteria for parameter transplantation in physically based distributed TOPKAPI-type flood prediction for ungauged basins

    3. Multi-criteria conditioning of integrated distributed hydrological models within GLUE: behavioural-solution discrimination, error-source separation, grid-scale choice, and calibration-data design

    Seafloor cold seeps and their ecosystems2 questions

    1. Validating deep-sea cold seep nitrogen loss: in situ rates, global seep extent, and the unconfirmed microbial agents

    2. Completing the faunal and biogeographic characterization of South China Sea cold seeps: the unsurveyed Yam (Four Way Closure Ridge) seep, unresolved taxa, and vent–seep population connectivity in the Northwest Pacific

    The Mystery of Marine Microorganisms' Species? —Insights from Pure Line Cultivation to Environmental Genomics Research2 questions

    1. What sets SAR11 ecotype seasonal and biogeographic boundaries in the North Atlantic: warm-ecotype persistence in the Western English Channel, the uncultured clade II lineages, and multidecadal change at BATS

    2. The unresolved eco-evolutionary basis of SAR11 (Pelagibacterales) species units: recombination versus ecological speciation, coexistence determinants, and reconciliation with rank-normalized taxonomy

    Age differences in dissolved organic carbon in the ocean3 questions

    1. The marine dissolved organic carbon size–age continuum: molecular basis, deep-ocean radiocarbon sources, and controls on recalcitrant DOC formation

    2. Origins of the ancient black-carbon component and the deep-conveyor aging mechanism of marine dissolved organic carbon radiocarbon

    3. Attribution of the anomalously 14C-depleted dissolved organic carbon in the deep North Pacific Ocean

    Why do abrupt transitions occur during downstream fining of riverbed sediment?10 questions

    1. A general mechanistic synthesis of the fluvial gravel–sand transition and the 1–5 mm grain-size gap in river bed sediments

    2. Autogenic origin of the fluvial grain-size gap and gravel–sand transition: is an externally imposed control necessary?

    3. Unifying the formation mechanism and migration dynamics of abrupt gravel-sand transitions in alluvial rivers

    4. Open questions on static-armor coarsening in a degradational sand–gravel bed: the role of evolving bed porosity and bed structure, the model time-scale mismatch, and representativeness for natural gravel–sand transitions

    5. Basin-scale test of the migrant gravel-front hypothesis: quantifying along-strike diachronism of the abrupt gravel-sand transition in the Siwalik molasse of the Himalayan foreland basin

    6. Controls on the grain size distribution of hillslope sediment supplied to river networks and its downstream transformation by abrasion and fragmentation

    7. Open questions on the gravel–sand transition in large lowland alluvial rivers under low and changing sediment supply: transient bed response, dam-altered regimes, and cross-system generality (from Singer, 2008)

    8. Does collision-driven attrition (spallation) quantitatively account for the abrupt grain-size transitions of alluvial rivers and eolian sand seas?

    9. Quantitative mechanisms, mass balance, and prediction of the punctuated, patch-mediated advance of the Vedder Canal gravel front

    10. Causal controls on the position and abruptness of the gravel-to-sand transition along the Upper Tualatin River, Oregon: valley-slope break, bank cohesion, and riparian vegetation, and the predictability of the transition by a coupled mechanistic model

    Formation and evolution of haze weather6 questions

    1. Causal attribution of accumulated winter haze PM2.5 mass to new-particle-formation-driven growth versus other secondary pathways in Beijing

    2. Quantitative attribution of the decadal evolution of winter fog and haze over North China and the Huang-Huai area, and the mechanism of its fog-level spatial patterns

    3. Organic aerosol hygroscopicity and the water-uptake-to-visibility chain during severe haze in eastern China

    4. Quantitative attribution of rapid multiphase sulfate formation during severe winter haze in northern China: dominant SO2 oxidation pathways, chemical regimes, and model closure

    5. Quantitative attribution of nitrate and sulfate formation pathways and emission sources during winter haze in the Longyou basin, eastern China

    6. Quantifying aqueous-phase secondary organic aerosol formation in Chinese winter haze and resolving the droplet-mode sampling ambiguity

    Estimating model error in ensemble data assimilation3 questions

    1. Autonomous regularized bias-aware ensemble Kalman filtering: adaptive tuning of the bias-regularization weight, validity of the linearized bias update, and robust learned bias prediction for time-dependent model errors

    2. Extending the multi-model ensemble Kalman filter to correlated inter-model forecast errors, per-model bias, and multi-attractor regimes

    3. Mis-specified time-correlated model error in the (ensemble) Kalman smoother beyond linear scalar dynamics: analysis and robust online estimation of the error memory time-scale

    The puzzle of plant colonization of land2 questions

    1. Origin and functional significance of the putatively horizontally acquired GRAS and PYR/PYL/RCAR stress-signaling gene families in the common ancestor of Zygnematophyceae and land plants

    2. Biological affinity of the earliest trilete and hilate spores: do the Late Ordovician dispersed-spore records document an Ordovician origin of the vascular-plant lineage?

    Distribution and Origin of Extinct Nuclides3 questions

    1. The origin of the early Solar System's fresh 26^{26}Al: self-consistent viability of supernova disk injection and the competing enrichment channels

    2. Deciding a purely Galactic-chemical-evolution origin for the early Solar System short-lived radionuclides 60^{60}Fe and 53^{53}Mn: the 60^{60}Fe/53^{53}Mn ratio mismatch and the missing supernova-source constraints

    3. Confirming or falsifying the low-mass core-collapse supernova trigger for solar system formation: multi-dimensional explosion and injection physics, short-lived radionuclide yields, and meteoritic isotopic tests

    Does Earth's inner core exhibit superrotation?3 questions

    1. Quantifying and explaining the reversing differential rotation of Earth's inner core: absolute rates, rotation versus inner-core-boundary structure change, the multi-decadal trajectory, and its dynamics

    2. Gravimetric detectability and inversion of the gravity-field signature of inner-core differential rotation

    3. Short-wavelength topography on Earth's inner-core boundary: advection by inner-core rotation versus time-dependent boundary change

    The Ancient Mystery—The Tunguska Explosion in 19084 questions

    1. Locating surviving macroscopic fragments of the 1908 Tunguska Cosmic Body: an uncertainty-quantified strewn field and its field test

    2. Unexplained luminous phenomena in the 1908 Tunguska eyewitness accounts: physical nature, relation to the primary energetic event, and reconciliation with the forestfall evidence

    3. The formation age of Lake Cheko (Siberia) and the impact-crater hypothesis for the 1908 Tunguska event

    4. The nature and atmospheric disintegration of the 1908 Tunguska cosmic body: cometary or asteroidal origin, fragmentation physics, and surviving ground remains

    The paradox of heat flow4 questions

    1. Apparent friction of the creeping San Andreas fault from heat flow

    2. Can heat-transport and energy-partitioning mechanisms mask frictional heating on the San Andreas Fault, or does the absence of a heat-flow anomaly require low fault shear stress?

    3. Determining the long-term strength of stick-slip versus creeping subduction megathrusts from heat flow, and reconciling it with independent strength indicators

    4. What sets the very low strength of the San Andreas Fault at seismogenic depth: weak smectite-bearing gouge, mineral fabric, or elevated pore-fluid pressure?

    Mechanisms of formation and evolution of thermohaline circulation4 questions

    1. Freshwater sensitivity of the Atlantic Meridional Overturning Circulation: meltwater routing, deglacial–interglacial state dependence, and model fidelity

    2. Physical grounding of the energy-constraint theory of thermohaline circulation: threshold robustness beyond conceptual models, an energy-to-mixing parameterization, and reconciliation with buoyancy-driven dynamics

    3. Does wind-stress-induced thermohaline circulation hysteresis and the coexistence of steady and Dansgaard–Oeschger-like oscillatory regimes persist in realistic ocean and coupled climate models?

    4. Glacial thermohaline circulation: which hemisphere forces Atlantic overturning variability at orbital versus millennial timescales?

    The Role of Human Activities in Global Climate Change2 questions

    1. Incorporating inter-model pattern uncertainty into optimal fingerprinting for model-robust attribution of greenhouse-gas versus other-anthropogenic warming

    2. Probabilistic energy-balance attribution of observed warming: the anthropogenic–natural partition under unresolved aerosol forcing, efficacy, and time-varying feedback uncertainties

    Coronal heating mechanism2 questions

    1. Closing the generation-to-dissipation chain of the ubiquitous low-frequency Alfvénic waves that power the quiet solar corona and fast solar wind

    2. Open core of the self-regulated coronal heating paradigm: reconnection regime and quantitative evaporation–collisionality feedback in solar coronal loops

    How can morphodynamic equations for alluvial riverbeds be closed and solved?7 questions

    1. Regime closure for disturbed gravel-bed rivers: the reference Shields stress–slope relation and transient channel adjustment under unsteady water and sediment supply

    2. Finite-amplitude saturation of river dune and antidune instabilities: closing the subcritical antidune branch and the role of suspended load

    3. Equilibrium shape of sediment-carrying rivers: extending the Boltzmann transport-equilibrium closure from laminar laboratory rivers to turbulent natural rivers

    4. Consistent closures for parameterized flow separation in river-dune evolution models: turbulence structure, stochastic sediment transport, solver coupling, and emergent wavelength selection

    5. Bed-roughness and sediment-transport parameterization of river ripples and dunes for large-scale morphodynamic models across steady, unsteady, and extreme flows

    6. The equilibrium shape of turbulent alluvial rivers carrying bedload: extending the sediment-load shape model of Popović et al. beyond laminar flow

    7. Nonlinear saturation of the laminar free-surface bar instability and a quantitative theory of the rhomboid beach pattern

    Abnormal patterns in forest vegetation distribution4 questions

    1. Attributing the widespread underfilling of potential climatic ranges in North American trees: dispersal lag versus unmeasured edaphic and biotic constraints

    2. The deglacial forest conundrum: attributing the multi-millennial lag between simulated and pollen-reconstructed Northern Hemisphere forest expansion

    3. Ground-truthing geobotanical mineral exploration in the Hokuroku district: causal validation of satellite-detected vegetation anomalies and their dependence on forest type, phenology, and land cover

    4. Causal attribution of community–climate disequilibrium and removal of the realized-niche bias in community climate frameworks

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