Recent Submissions

  • Rapid retreat of Thwaites Glacier in the pre-satellite era 

    Graham, Alastair G. C.; Wåhlin, Anna; Hogan, Kelly A.; Nitsche, Frank O.; Heywood, Karen J.; (2022)
    Understanding the recent history of Thwaites Glacier, and the processes controlling its ongoing retreat, is key to projecting Antarctic contributions to future sea-level rise. Of particular concern is how the glacier grounding zone might evolve over coming decades where it is stabilized by sea-floor bathymetric highs. Here we use geophysical data ...
  • Recent Ostracod Fauna of the Western Ross Sea (Antarctica): A Poorly Known Ingredient of Polar Carbonate Factories 

    Salvi, Gianguido; Anderson, John B.; Bertoli, Marco; Castagno, Pasquale; Falco, Pierpaolo; (2022)
    Ostracoda are a minor but recurrent component of Southern Ocean marine carbonate factories, and their low-Mg calcitic skeletal mineralogy helps in ensuring a noteworthy post-mortem resilience. Our study, based upon surface sediment occurrences, contributes to the better definition of their distribution vs. potential controlling factors in Antarctic ...
  • Artificial Soils Reveal Individual Factor Controls on Microbial Processes 

    Del Valle, Ilenne; Gao, Xiaodong; Ghezzehei, Teamrat A.; Silberg, Jonathan J.; Masiello, Caroline A. (2022)
    Soil matrix properties influence microbial behaviors that underlie nutrient cycling, greenhouse gas production, and soil formation. However, the dynamic and heterogeneous nature of soils makes it challenging to untangle the effects of different matrix properties on microbial behaviors. To address this challenge, we developed a tunable artificial soil ...
  • A Framework for the Systematic Selection of Biosensor Chassis for Environmental Synthetic Biology 

    Sridhar, Swetha; Ajo-Franklin, Caroline M.; Masiello, Caroline A. (2022)
    Microbial biosensors sense and report exposures to stimuli, thereby facilitating our understanding of environmental processes. Successful design and deployment of biosensors hinge on the persistence of the microbial host of the genetic circuit, termed the chassis. However, model chassis organisms may persist poorly in environmental conditions. In ...
  • Sedimentological and Geochemical Perspectives on a Marginal Lake Environment Recorded in the Hartmann's Valley and Karasburg Members of the Murray Formation, Gale Crater, Mars 

    Gwizd, S.; Fedo, C.; Grotzinger, J.; Banham, S.; Rivera-Hernández, F.; (2022)
    This study utilizes instruments from the Curiosity rover payload to develop an integrated paleoenvironmental and compositional reconstruction for the 65-m thick interval of stratigraphy comprising the Hartmann's Valley and Karasburg members of the Murray formation, Gale crater, Mars. The stratigraphy consists of cross-stratified sandstone (Facies 1), ...
  • Increasing Health Risks During Outdoor Sports Due To Climate Change in Texas: Projections Versus Attitudes 

    Dee, Sylvia G.; Nabizadeh, Ebrahim; Nittrouer, Christine L.; Baldwin, Jane W.; Li, Chelsea; (2022)
    Extreme heat is a recognized threat to human health. This study examines projected future trends of multiple measures of extreme heat across Texas throughout the next century, and evaluates the expected climate changes alongside Texas athletic staff (coach and athletic trainer) attitudes toward heat and climate change. Numerical climate simulations ...
  • Clumped-Isotope Constraint on Upper-Tropospheric Cooling During the Last Glacial Maximum 

    Banerjee, Asmita; Yeung, Laurence Y.; Murray, Lee T.; Tie, Xin; Tierney, Jessica E.; (2022)
    Ice cores and other paleotemperature proxies, together with general circulation models, have provided information on past surface temperatures and the atmosphere's composition in different climates. Little is known, however, about past temperatures at high altitudes, which play a crucial role in Earth's radiative energy budget. Paleoclimate records ...
  • Seismic evidence for lithospheric boudinage and its implications for continental rifting 

    Nguyen, Luan C.; Levander, Alan; Niu, Fenglin; Morgan, Julia; Li, Guoliang (2022)
    The continental rifting that precedes the breakup of a continent and the formation of a new ocean basin is one of the key processes of plate tectonics. Although often viewed as a two-dimensional process, rifted margins exhibit significant variations along strike. We document along-strike variations developed during the ca. 200–160 Ma continental ...
  • Early to middle Miocene ice sheet dynamics in the westernmost Ross Sea (Antarctica): Regional correlations 

    Pérez, Lara F.; McKay, Robert M.; De Santis, Laura; Larter, Robert D.; Levy, Richard H.; (2022)
    The present-day morpho-stratigraphy of the Ross Sea is the result of Cenozoic tectonic and cryospheric events, and constitutes a key record of Antarctica's cryospheric evolution. An enduring problem in interpreting this record in a broader regional context is that the correlation between eastern and western Ross Sea stratigraphy has remained uncertain ...
  • Outgassing through magmatic fractures enables effusive eruption of silicic magma 

    Crozier, Josh; Tramontano, Samantha; Forte, Pablo; Oliva, Sarah Jaye C.; Gonnermann, Helge M.; (2022)
    Several mechanisms have been proposed to allow highly viscous silicic magma to outgas efficiently enough to erupt effusively. There is increasing evidence that challenges the classic foam-collapse model in which gas escapes through permeable bubble networks, and instead suggests that magmatic fracturing and/or accompanying localized fragmentation and ...
  • Burial and Exhumation of Sedimentary Rocks Revealed by the Base Stimson Erosional Unconformity, Gale Crater, Mars 

    Watkins, Jessica A.; Grotzinger, John P.; Stein, Nathan T.; Banham, Steven G.; Gupta, Sanjeev; (2022)
    Sedimentary rocks record the ancient climate of Mars through changes between subaqueous and eolian depositional environments, recognized by their stratal geometries and suites of sedimentary structures. Orbiter- and rover-image-based geologic mapping show a dynamic evolution of the 5-km-thick sedimentary sequence exposed along the flanks of Aeolis ...
  • Tridymite in a lacustrine mudstone in Gale Crater, Mars: Evidence for an explosive silicic eruption during the Hesperian 

    Payré, V.; Siebach, K. L.; Thorpe, M. T.; Antoshechkina, P.; Rampe, E. B. (2022)
    The unexpected detection of ∼16 wt.% monoclinic tridymite, a high-temperature silica polymorph, within an otherwise lacustrine mudstone in Gale crater, Mars raises significant questions about its formation and the extent of magmatic evolution on that planet. The rock sample, analyzed by the X-ray diffractometer onboard the Curiosity rover, also ...
  • Watching the Cryosphere Thaw: Seismic Monitoring of Permafrost Degradation Using Distributed Acoustic Sensing During a Controlled Heating Experiment 

    Cheng, Feng; Lindsey, Nathaniel J.; Sobolevskaia, Valeriia; Dou, Shan; Freifeld, Barry; (2022)
    Permafrost degradation is rapidly increasing in response to a warming Arctic climate, altering landscapes and damaging critical infrastructure. Solutions for monitoring permafrost thaw dynamics are essential to understand biogeochemical feedbacks as well as to issue warnings for hazardous geotechnical conditions. We investigate the feasibility of ...
  • Geologic Evidence of Lithostatic Pore Fluid Pressures the Base of the Subduction Seismogenic Zone 

    Condit, C. B.; French, M. E. (2022)
    Geophysical and rheological work below the subduction seismogenic zone suggest that elevated pore fluid pressures (Pfs) may facilitate slow slip and tremor. However, quantification of Pf and its variation in this environment remain indirect and incomplete. We examine brittle-frictional deformation within metasedimentary rocks from an exhumed subduction ...
  • A novel and efficient engine for P-/S-wave-mode vector decomposition for vertical transverse isotropic elastic reverse time migration 

    Zhang, Lele; Liu, Lu; Niu, Fenglin; Zuo, Jiahui; Shuai, Da; (2022)
    Wave-mode decomposition plays a very important role in elastic reverse time migration (ERTM). Improved imaging quality can be achieved due to reduced wave-mode crosstalk artifacts. The current state-of-the-art methods for anisotropic wavefield separation are based on either splitting model strategy, low-rank approximation, or lower-upper (LU) ...
  • Sedimentary and crustal structure of the US Gulf Coast revealed by Rayleigh wave and teleseismic P coda data with implications for continent rifting 

    Miao, Wenpei; Niu, Fenglin; Li, Guoliang; Levander, Alan (2022)
    We have developed an S-wave model of the south-central US focusing on the Gulf Coast sedimentary basin and its crust to understand continental rifting and regional tectonics. The model was derived by a joint inversion of Rayleigh wave phase velocities, Z/H ratios and P-coda data. The surface- and body-wave measurements were made, respectively, from ...
  • Land Use and Land Cover Shape River Water Quality at a Continental Caribbean Land-Ocean Interface 

    Clark, Kasey E.; Bravo, Viviana D.; Giddings, Sarah N.; Davis, Kristen A.; Pawlak, Geno; (2022)
    Land use and land cover (LULC) can significantly alter river water, which can in turn have important impacts on downstream coastal ecosystems by delivering nutrients that promote marine eutrophication and hypoxia. Well-documented in temperate systems, less is known about the way land cover relates to water quality in low-lying coastal zones in the ...
  • Magma and Mineral Composition Response to Increasing Slab-Derived Fluid Flux: Nevado de Longaví Volcano, Southern Chilean Andes 

    Sellés, Daniel; Dungan, Michael; Langmuir, Charles; Rodríguez, Ana Carolina; Leeman, William P. (2022)
    Nevado de Longaví volcano (NLV), in the Southern-Central Chilean Andes, has erupted during the Holocene magmas with compositions that are in several ways atypical for the region. These characteristics include elevated La/Yb ratios in evolved magmas, in an area of only moderately thick crust, coupled with low concentrations of K, Th, and other ...
  • Transport Processes in the Gulf of Mexico Along the River-Estuary-Shelf-Ocean Continuum: a Review of Research from the Gulf of Mexico Research Initiative 

    Justić, Dubravko; Kourafalou, Villy; Mariotti, Giulio; He, Songjie; Weisberg, Robert; (2022)
    Estuarine and coastal geomorphology, biogeochemistry, water quality, and coastal food webs in river-dominated shelves of the Gulf of Mexico (GoM) are modulated by transport processes associated with river inputs, winds, waves, tides, and deep-ocean/continental shelf interactions. For instance, transport processes control the fate of river-borne ...
  • The dynamics of warming during the last deglaciation in high-elevation regions of Eastern Equatorial Africa 

    Garelick, Sloane; Russell, James; Richards, Adin; Smith, Jamila; Kelly, Meredith; (2022)
    Tropical mountain environments, such as the Rwenzori Mountains in equatorial Africa, are thought to be particularly sensitive to climate change. Ongoing warming in the Rwenzori is impacting local environments and communities through glacial retreat, fires, and flooding. Paleoclimate reconstructions from elsewhere in Africa suggest considerable warming ...

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