Journal of Geophysical Research: Planets最新文献_第10页

The Role and Lifetime of Dissociative Heterogeneous Processes in Improving Simulated Ozone on Mars 分解异质过程在改善火星模拟臭氧中的作用和寿命

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-07-09 DOI: 10.1029/2024JE008302

M. A. J. Brown, M. R. Patel, S. R. Lewis, J. A. Holmes, F. Lefèvre, J. P. Mason, M. Crismani

{"title":"The Role and Lifetime of Dissociative Heterogeneous Processes in Improving Simulated Ozone on Mars","authors":"M. A. J. Brown, M. R. Patel, S. R. Lewis, J. A. Holmes, F. Lefèvre, J. P. Mason, M. Crismani","doi":"10.1029/2024JE008302","DOIUrl":"https://doi.org/10.1029/2024JE008302","url":null,"abstract":"Ozone simulated in Mars Global Climate Models (MGCMs) is used to assess the underlying chemistry occurring in the atmosphere. Currently, ozone total column abundance (TCA) is under-predicted in MGCMs by up to 120%, implying missing or inaccurate chemistry in models. Heterogeneous reactions of hydroxyl radicals (HOX) have been offered as an explanation for some of this bias, because they cause ozone to increase at locations where it's currently under-predicted. We use four simulations to compare modeled ozone TCA with observations from the UVIS spectrometer aboard the ExoMars Trace Gas Orbiter to improve the representation of heterogeneous processes and their impact on ozone. We use a gas-phase only run, a dissociative scheme, an adsorbed HOX retention scheme, and a hybrid scheme that combines the dissociative mechanism with the retention of HOX on water ice. We find retention of HOX is dependent on water ice sublimation, and ozone abundance increases when water ice persists for longer periods (1–20 sols). Over time, the loss of HOX causes a depletion in H2O2 concentration (HOX reservoir), and thus allows ozone concentration to increase. When adsorbed HOX are desorbed and dissociate into other by-products, HOX are not immediately available to destroy ozone. This results in larger ozone concentrations than if desorbed HOX are released directly back into their gaseous states. When using the hybrid scheme, ozone TCA is increased up to 50% where the ozone deficit is greatest, demonstrating the best agreement with observations, and implying that HOX radicals are both retained when adsorbed and dissociate.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JE008302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141583731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Topography-Enhanced Ultra-Cold Trapping at the LCROSS Impact Site LCROSS撞击点的地形增强型超冷捕获

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-07-09 DOI: 10.1029/2023JE007925

C. W. Hayes, D. A. Minton, J. L. Kloos, J. E. Moores

{"title":"Topography-Enhanced Ultra-Cold Trapping at the LCROSS Impact Site","authors":"C. W. Hayes, D. A. Minton, J. L. Kloos, J. E. Moores","doi":"10.1029/2023JE007925","DOIUrl":"https://doi.org/10.1029/2023JE007925","url":null,"abstract":"Small topographic features below the resolution of existing orbital data sets may create “micro ultra-cold traps” within the larger permanently shadowed regions that are present at the lunar poles. These ultra-cold traps are protected from the major primary and secondary illumination sources, and thus would create surfaces that are much colder than lower-resolution temperature maps would indicate. We examine this effect by creating a high resolution (1 m pix−1) terrain map based on upscaled data from the Lunar Orbiter Laser Altimeter. This map is illuminated by scattered sunlight and infrared emissions from sunlit terrain, which are then run through a thermal model to determine temperatures. We find that while most of the terrain experiences maximum temperatures around 50 K, there are a number of 1–30 m-scale ultra-cold traps with maximum temperatures as low as 20–30 K. By comparing our modeled ultra-cold trapping area to volatile abundances measured by Lunar Crater Observation and Sensing Satellite (LCROSS), we reveal a diverse environment where the surficial abundances necessary to explain the LCROSS results are strongly dependent on precisely where the impact occurred.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE007925","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141583730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical Properties of LL6 Chondrites Under Pressures Relevant to Rocky Interiors of Icy Moons 冰卫星岩石内部相关压力下的 LL6 颗软玉的力学特性

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-07-08 DOI: 10.1029/2024JE008296

Cassandra Seltzer, Hoagy O'Ghaffari, Matěj Peč

{"title":"Mechanical Properties of LL6 Chondrites Under Pressures Relevant to Rocky Interiors of Icy Moons","authors":"Cassandra Seltzer, Hoagy O'Ghaffari, Matěj Peč","doi":"10.1029/2024JE008296","DOIUrl":"https://doi.org/10.1029/2024JE008296","url":null,"abstract":"Icy moons in the outer Solar System likely contain rocky, chondritic interiors, but this material is rarely studied under confining pressure. The contribution of rocky interiors to deformation and heat generation is therefore poorly constrained. We deformed LL6 chondrites at confining pressures ≤100 MPa and quasistatic strain rates. We defined a failure envelope, recorded acoustic emissions (AEs), measured ultrasonic velocities, and retrieved static and dynamic elastic moduli for the experimental conditions. The Young's modulus, which quantifies stiffness, of the chondritic material increased with increasing confining pressure. The material reached its peak strength, which is the maximum supported differential stress (σ1 − σ3), between 40 and 50 MPa confining pressure. Above this 40–50 MPa range of confining pressure, the stiffness increased significantly, while the peak strength dropped. Acoustic emission events associated with brittle deformation mechanisms occurred both during isotropic pressurization (σ1 = σ2 = σ3) as well as at low differential stresses during triaxial deformation (σ1 > σ2 = σ3), during nominally “elastic” deformation, indicating that dissipative processes are likely possible in the rocky interiors of icy moons. These events also occurred less frequently at higher confining pressures. We therefore suggest that the chondritic interiors of icy moons could become less compliant, and possibly less dissipative, as a function of the moons' pressure and size.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JE008296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141565871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Views of Lunar Seismicity Brought by Analysis of Newly Discovered Moonquakes in Apollo Short-Period Seismic Data 分析阿波罗短周期地震数据中新发现的月震带来的月球地震新观点

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-07-05 DOI: 10.1029/2023JE008153

Keisuke Onodera

{"title":"New Views of Lunar Seismicity Brought by Analysis of Newly Discovered Moonquakes in Apollo Short-Period Seismic Data","authors":"Keisuke Onodera","doi":"10.1029/2023JE008153","DOIUrl":"https://doi.org/10.1029/2023JE008153","url":null,"abstract":"In the 1970s, two types of seismometers were installed on the nearside of the Moon. One type is called the Long-Period (LP) seismometer, which is sensitive below 1.5 Hz. The other is called the Short-Period (SP) seismometer, whose sensitivity is high around 2–10 Hz. So far, more than 13,000 seismic events have been identified through analyzing the LP data, which allowed us to investigate lunar seismicity and its internal structure. On the other hand, most of the SP data have remained unanalyzed because they include numerous artifacts. This fact leads to the hypotheses that (a) we have missed lots of high-frequency seismic events and (b) lunar seismicity could be underestimated. To verify these ideas, I conducted an analysis of the SP data. In the analysis, I denoised the original SP data and performed the event detections by comparing the spectral features between the cataloged high-frequency events (such as shallow moonquakes) and the continuous SP data. Eventually, I discovered 22,000 new seismic events, including thermal moonquakes, impact-induced events, and shallow moonquakes. Among these, I focused on analyzing shallow moonquakes—tectonic-related quakes. Consequently, it turned out that there were 2.6 times more tectonic events than considered before. Furthermore, additional detections of shallow moonquakes enabled me to see the regionality in seismicity. Comparing three landing sites (Apollo 14, 15, and 16), I found that the Apollo 15 site was more seismically active than others. These findings can change the conventional views of lunar seismicity.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE008153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141536582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Amazonian Tectonic Evolution of Ceraunius and Tractus Fossae, Mars, and Implications for Local Magmatic Sources 火星 Ceraunius 和 Tractus Fossae 的亚马逊构造演化及其对当地岩浆源的影响

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-07-04 DOI: 10.1029/2023JE008123

Stephanie Shahrzad, Emma K. Bramham, Sandra Piazolo, Mark Thomas, Paul K. Byrne

{"title":"Amazonian Tectonic Evolution of Ceraunius and Tractus Fossae, Mars, and Implications for Local Magmatic Sources","authors":"Stephanie Shahrzad, Emma K. Bramham, Sandra Piazolo, Mark Thomas, Paul K. Byrne","doi":"10.1029/2023JE008123","DOIUrl":"https://doi.org/10.1029/2023JE008123","url":null,"abstract":"The heavily faulted Martian terrains of Ceraunius Fossae and Tractus Fossae, south of the Alba Mons volcano, have previously only been considered as parts of larger tectonic studies of Alba Mons, and consequently the complexity of the faulting remains unclear. As these terrains are in the midst of the large Tharsis volcanoes, the study of their surface deformation has the potential to help unravel the volcano-tectonic deformation associated with the growth of Tharsis as well as to decipher details of the magma-tectonic processes responsible for graben formation. Here, we distinguish between faults and collapse structures based on image and topographic evidence. We mapped ∼12,000 faults, which we grouped into three distinct fault groups based on orientation, morphology, and relative ages. These show a temporal evolution in the mapped fault orientations from NE to N-S to NW with associated changes in stress orientations. We also mapped collapse features and categorized them into four different groups: pit-crater chains, catenae, u-shaped troughs and chasmata. Examining the four collapse structure groups reveals that they are likely four progressive stages in the erosional evolution of pit-crater chains. Together, this revealed a structural history heavily influenced by lateral diking from both local (radial to Alba Mons, Pavonis Mons and Ascraeus Mons) and regional (radial to Tharsis) sources, and vertical diking from a proposed Ceraunius Fossae centered magma source. This, along with an updated crater size-frequency distribution analysis of the unit ages, reveals a highly active tectonic and magmatic environment south of Alba Mons in the Middle Amazonian.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE008123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141536674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Moment of Inertia and Tectonic Record of Asteroid 16 Psyche May Reveal Interior Structure and Core Solidification Processes 小行星 16 Psyche 的惯性矩和构造记录可能揭示内部结构和核心凝固过程

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-06-29 DOI: 10.1029/2024JE008291

Fiona Nichols-Fleming, Alexander J. Evans, Brandon C. Johnson, Michael M. Sori

{"title":"Moment of Inertia and Tectonic Record of Asteroid 16 Psyche May Reveal Interior Structure and Core Solidification Processes","authors":"Fiona Nichols-Fleming, Alexander J. Evans, Brandon C. Johnson, Michael M. Sori","doi":"10.1029/2024JE008291","DOIUrl":"https://doi.org/10.1029/2024JE008291","url":null,"abstract":"The thermal and chemical evolution of (16) Psyche would have been influenced by the direction of core solidification and thickness of an outer (rocky) silicate layer. We model the thermal evolution and core solidification of Psyche for a range of outer silicate layer thicknesses and core sulfur contents to calculate the resulting radial contraction and moments of inertia. We generally find that increasing the thickness of the outer silicate layer by 10 km results in a ∼1-km reduction in total radial contraction. Additionally, we find that the timing of full core solidification, and thus a large amount of predicted contraction, can differ by up to 25 Myr for inward versus outward core growth. Finally, our calculated moment-of-inertia factors for models with inward core growth that contain sulfur are consistently larger than those with outward core growth. Ultimately, spacecraft-derived estimates of Psyche's moment of inertia and surface contraction will be able to provide constraints on Psyche's interior evolution, silicate layer thickness, and direction of core solidification.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mantle Mineralogy of Reduced Sub-Earths Exoplanets and Exo-Mercuries 还原亚地球的地幔矿物学太阳系外行星和外墨丘利

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-06-27 DOI: 10.1029/2023JE008234

Camilla Cioria, Giuseppe Mitri, James Alexander Denis Connolly, Jean-Philippe Perrillat, Fabrizio Saracino

{"title":"Mantle Mineralogy of Reduced Sub-Earths Exoplanets and Exo-Mercuries","authors":"Camilla Cioria, Giuseppe Mitri, James Alexander Denis Connolly, Jean-Philippe Perrillat, Fabrizio Saracino","doi":"10.1029/2023JE008234","DOIUrl":"https://doi.org/10.1029/2023JE008234","url":null,"abstract":"The mineralogy of planetary mantles formed under reducing conditions, as documented in the inner regions of the solar system, is not well constrained. We present thermodynamic models of mineral assemblages that would constitute the mantles of exo-Mercuries. We investigated reduced materials such as enstatite chondrites, CH, and CB chondrites, and aubrites, as precursor bulk compositions in phase equilibrium modeling. The resulting isochemical phase diagram sections indicate that dominant phases in these reduced mantles would be pyroxenes rather than olivine, contrasting with the olivine-rich mantles found within Earth, Mars, and Venus. The pyroxene abundances in the modeled mantles assemblages depend on the silica content shown by precursor materials. The silica abundance in the mantle is closely related to Si abundance in the core, particularly in reduced environments. In addition, we propose that pyroxene-rich mantles exhibit more vigorous convective and tectonic activity than olivine-rich mantles, given that pyroxene-rich mantles would have lower viscosity and a lower solidus temperature (Ts).","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dome Craters on Ganymede and Callisto May Form by Topographic Relaxation of Pit Craters Aided by Remnant Impact Heat 木卫三和卡利斯托上的穹形陨石坑可能是在撞击余热的帮助下通过坑状陨石坑的地形松弛形成的

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-06-27 DOI: 10.1029/2023JE008258

M. L. Caussi, A. J. Dombard, D. G. Korycansky, O. L. White, J. M. Moore, P. M. Schenk

{"title":"Dome Craters on Ganymede and Callisto May Form by Topographic Relaxation of Pit Craters Aided by Remnant Impact Heat","authors":"M. L. Caussi, A. J. Dombard, D. G. Korycansky, O. L. White, J. M. Moore, P. M. Schenk","doi":"10.1029/2023JE008258","DOIUrl":"https://doi.org/10.1029/2023JE008258","url":null,"abstract":"The icy Galilean satellites display impact crater morphologies that are rare in the Solar System. They deviate from the archetypal sequence of crater morphologies as a function of size found on rocky bodies and other icy satellites: they exhibit central pits in place of peaks, followed by central dome craters, anomalous dome craters, penepalimpsests, palimpsests, and multi-ring structures. Understanding the origin of these features will provide insight into the geophysical factors that operate within the icy Galilean satellites. Pit craters above a size threshold feature domes. This trend, and the similarity in morphology between the two classes, suggest a genetic link between pit and dome craters. We propose that dome craters evolve from pit craters through topographic relaxation, facilitated by remnant heat from the impact. Our finite element simulations show that, for the specific crater sizes where we see domes on Ganymede and Callisto, domes form from pit craters within 10 Myr. Topographic relaxation eliminates the stresses induced by crater topography and restores a flat surface: ice flows downwards from the rim and upwards from the crater depression driven by gravity. When the starting topography is a pit crater, the heat left over from the impact is concentrated below the pit. Since warm ice flows more rapidly, the upward flow is enhanced beneath the pit, leading to the emergence of a dome. Given the timescales and the dependence on heat flux, this model could be used to constrain the thermal history and evolution of these moons.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE008258","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating the Use of Seasonal Surface Displacements and Time-Variable Gravity to Constrain the Interior of Mars 评估利用季节性地表位移和时变重力来约束火星内部的情况

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-06-25 DOI: 10.1029/2023JE008053

N. L. Wagner, P. B. James, A. I. Ermakov, M. M. Sori

{"title":"Evaluating the Use of Seasonal Surface Displacements and Time-Variable Gravity to Constrain the Interior of Mars","authors":"N. L. Wagner, P. B. James, A. I. Ermakov, M. M. Sori","doi":"10.1029/2023JE008053","DOIUrl":"https://doi.org/10.1029/2023JE008053","url":null,"abstract":"The mass transport of volatiles on Mars represents a seasonally changing load on the surface of the planet. Like on Earth, as mass is redistributed across the planet, the surface responds in a complex manner becoming displaced downwards or upwards. The magnitude and extent of displacement depend on the properties of the load and mechanical properties of the planetary interior. Based on new estimates of the height variation of the seasonal polar caps (SPCs), we predict local surface displacements of up to tens of millimeters with a strong degree 1 signal throughout the Martian year. The long-wavelength portion of the displacement is potentially observable, with a magnitude of a few millimeters, located away from the SPC where one could realistically measure it with a landed or orbital mission. We also model the direct contribution of this process to observable time variable gravity, where we find the zonal coefficients to be in line with previous measurements, although with a smaller magnitude. Future measurements of this displacement could be used to help elucidate the composition of the interior of Mars using this process as a probe into the Martian interior. Furthermore, more refined measurements of time-variable gravity would be a powerful tool in constraining the pole-to-pole volatile cycle present on Mars.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE008053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustaining Hydrothermal Circulation With Gravity Relevant to Ocean Worlds 利用与海洋世界相关的重力维持热液循环

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2024-06-24 DOI: 10.1029/2023JE008202

A. T. Fisher, K. L. Dickerson, D. K. Blackman, N. G. Randolph-Flagg, C. R. German, C. Sotin

{"title":"Sustaining Hydrothermal Circulation With Gravity Relevant to Ocean Worlds","authors":"A. T. Fisher, K. L. Dickerson, D. K. Blackman, N. G. Randolph-Flagg, C. R. German, C. Sotin","doi":"10.1029/2023JE008202","DOIUrl":"https://doi.org/10.1029/2023JE008202","url":null,"abstract":"Some ocean worlds may sustain active, seafloor hydrothermal systems, but the characteristics and controls on fluid-heat transport in these systems are not well understood. We developed three-dimensional numerical simulations, using a ridge-flank hydrothermal system on Earth as a reference, to test the influence of ocean world gravity on fluid and heat transport. Simulations represented the upper ∼4–5 km below the seafloor and explored ranges of: heat input at the base, aquifer thickness, depth, and permeability, and gravity values appropriate for Earth, Europa, and Enceladus. We tested when a hydrothermal siphon could be sustained and quantified consequent circulation temperatures, flow rates, and advective heat output. Calculations illustrate a trade-off in energy between the reduction of buoyancy at lower gravity, which tends to reduce the primary forces driving fluid circulation, and the concomitant reduction in secondary convection, which consumes available energy. When a siphon was sustained under lower gravity, circulation temperatures tended to increase modestly (which should lead to more extensive geochemical reactions), whereas mass flow rates and advective heat output tended to be reduced. Deeper subseafloor circulation resulted in higher temperatures and flow rates, with a deeper, thin aquifer being more efficient in removing heat from the rocky interior. Water-rock ratios were lower when gravity was lower, as was the efficiency of heat extraction, whereas the time required to circulate the volume of an ocean-world's ocean through the seafloor increased. This may help to explain how small ocean worlds could sustain hydrothermal circulation for a long time despite limited heat sources.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JE008202","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0