Earth and Space Science最新文献

Near Real-Time In Situ Monitoring of Nearshore Ocean Currents Using Distributed Acoustic Sensing on Submarine Fiber-Optic Cable 利用海底光纤电缆上的分布式声学传感技术对近岸海流进行近实时现场监测

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-09-07 DOI: 10.1029/2024EA003572

Zhenghong Song, Xiangfang Zeng, Sidao Ni, Benxin Chi, Tengfei Xu, Zexun Wei, Wenzheng Jiang, Sheng Chen, Jun Xie

{"title":"Near Real-Time In Situ Monitoring of Nearshore Ocean Currents Using Distributed Acoustic Sensing on Submarine Fiber-Optic Cable","authors":"Zhenghong Song, Xiangfang Zeng, Sidao Ni, Benxin Chi, Tengfei Xu, Zexun Wei, Wenzheng Jiang, Sheng Chen, Jun Xie","doi":"10.1029/2024EA003572","DOIUrl":"https://doi.org/10.1029/2024EA003572","url":null,"abstract":"In the nearshore area, ocean current display intricate complexities due to interactions among tide, river, and coastline, which makes accurate current modeling challenging. Continuous in situ observation with high spatial and temporal resolution helps to better understand the dynamics of these currents. In this study, we used a 10-km long submarine fiber-optic cable with distributed acoustic sensing technology to record seismic signals associated with ocean waves. The current velocity and water depth were obtained from the velocity dispersion using frequency-wave number analysis matched against theoretical ocean wave propagation equations. The results show remarkable agreement with observation of a nearby current meter, confirming the dominance of tidal currents as well as a small-scale residual current. The temporal variation of water depth is consistent with observation by a nearby tidal gauge. This study demonstrates the potential of using submarine fiber-optic cable for long-term, high-resolution, near real-time nearshore current monitoring.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003572","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142152173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Updated OMI Glyoxal Column Measurements Using Collection 4 Level 1B Radiances 使用第 4 号采集 1B 级辐射测量更新的 OMI 乙二醛柱测量结果

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-09-07 DOI: 10.1029/2024EA003705

Hyeong-Ahn Kwon, Gonzalo González Abad, Christopher Chan Miller, Kirsten R. Hall, Caroline R. Nowlan, Ewan O’Sullivan, Huiqun Wang, Heesung Chong, Zolal Ayazpour, Xiong Liu, Kelly Chance

{"title":"Updated OMI Glyoxal Column Measurements Using Collection 4 Level 1B Radiances","authors":"Hyeong-Ahn Kwon, Gonzalo González Abad, Christopher Chan Miller, Kirsten R. Hall, Caroline R. Nowlan, Ewan O’Sullivan, Huiqun Wang, Heesung Chong, Zolal Ayazpour, Xiong Liu, Kelly Chance","doi":"10.1029/2024EA003705","DOIUrl":"https://doi.org/10.1029/2024EA003705","url":null,"abstract":"This study presents new glyoxal (CHOCHO) products from the Ozone Monitoring Instrument (OMI) by utilizing updated level 1B irradiance/radiance data (Collection 4) and an updated glyoxal retrieval algorithm. The adoption of Collection 4 contributes to the reduction of artificial signals in differential glyoxal slant column densities (dSCDs) and improved fitting root mean square, and the updated retrieval settings result in fewer negative values of glyoxal dSCDs over oceans and less noisy dSCDs in the South Atlantic Anomaly. On-line calculations of air mass factors consider interactive physical processes between input parameters. To address persistent trends in glyoxal SCDs over the Pacific Ocean that remain despite these updates, a trend correction is implemented. We evaluate the updated OMI glyoxal products using inter-comparisons with GOME-2A/2B glyoxal products. OMI glyoxal products exhibit good spatial and temporal agreement with GOME-2A/2B, with correlation coefficients of 0.75–0.78 globally and 0.84–0.85 over source regions. Small biases are observed in OMI glyoxal vertical column densities, ranging from −0.2 ± 5.7% to 9 ± 3% in low and high glyoxal conditions, respectively, against GOME-2A/2B. These advancements contribute to the reliability and accuracy of OMI glyoxal products, enhancing their utility for atmospheric studies and enabling a 20-year-long data record suitable for climate studies.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003705","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142152183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A Novel Surface Energy Balance Method for Thermal Inertia Studies of Terrestrial Analogs 用于地球类似物热惯性研究的新型表面能量平衡法

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-09-04 DOI: 10.1029/2023EA003259

Ari H. D. Koeppel, Christopher S. Edwards, Lauren A. Edgar, Scott Nowicki, Kristen A. Bennett, Amber Gullikson, Sylvain Piqueux, Helen Eifert, Daphne Chapline, A. Deanne Rogers

{"title":"A Novel Surface Energy Balance Method for Thermal Inertia Studies of Terrestrial Analogs","authors":"Ari H. D. Koeppel, Christopher S. Edwards, Lauren A. Edgar, Scott Nowicki, Kristen A. Bennett, Amber Gullikson, Sylvain Piqueux, Helen Eifert, Daphne Chapline, A. Deanne Rogers","doi":"10.1029/2023EA003259","DOIUrl":"https://doi.org/10.1029/2023EA003259","url":null,"abstract":"Surface thermal inertia derived from satellite imagery offers a valuable tool for remotely mapping the physical structure and water content of planetary regolith. Efforts to quantify thermal inertia using surface temperatures on Earth, however, have consistently yielded large uncertainties and suffered from a lack of reproducibility. Unlike dry or airless bodies, Earth's abundant water and dense atmosphere lead to dynamic thermophysical conditions that are a greater challenge to model than on a world like Mars. In this work, an approach was developed using field experiments to inform and fine-tune a thermophysical model of terrestrial sediment and calculate an inherent thermal inertia value with higher precision and less initial knowledge of the sediment than has previously been achieved remotely on Earth. A thermal inertia derived for a basaltic tephra site in Northern Arizona was replicated within 1% between different field seasons, demonstrating reproducibility. Model-derived values were validated in situ by two different thermophysical field probes to within 8% of the measured mean values. Analog studies such as this hold the promise of improved interpretations of surface materials on Mars, and an accurate thermal model for Earth is the key step to enabling translation between the two worlds.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023EA003259","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The Benefits of Future Quantum Accelerometers for Satellite Gravimetry 未来量子加速度计对卫星重力测量的益处

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-09-01 DOI: 10.1029/2024EA003630

P. Zingerle, M. Romeshkani, J. Haas, T. Gruber, A. Güntner, J. Müller, R. Pail

{"title":"The Benefits of Future Quantum Accelerometers for Satellite Gravimetry","authors":"P. Zingerle, M. Romeshkani, J. Haas, T. Gruber, A. Güntner, J. Müller, R. Pail","doi":"10.1029/2024EA003630","DOIUrl":"https://doi.org/10.1029/2024EA003630","url":null,"abstract":"We investigate the benefits of future quantum accelerometers based on cold atom interferometry (CAI) on current and upcoming satellite gravity mission concepts. These mission concepts include satellite-to-satellite tracking (SST) in a single-pair (GRACE-like) and double-pair constellation as well as satellite gravity gradiometry (SGG, single satellite, GOCE-like). Regarding instruments, four scenarios are considered: current-generation electrostatic (GRACE-, GOCE-like), next-generation electrostatic, conservative hybrid/CAI and optimistic hybrid/CAI. For SST, it is shown that temporal aliasing poses currently the dominating error source in simulated global gravity field solutions independent of the investigated instrument and constellation. To still quantify the advantages of CAI instruments on the gravity functional itself, additional simulations are performed where the impact of temporal aliasing is synthetically reduced. When neglecting temporal aliasing, future accelerometers in conjunction with future ranging instruments can substantially improve the retrieval performance of the Earth's gravity field (depending on instrument and constellation). These simulation results are further investigated regarding possible benefit for hydrological use cases where these improvements can also be observed (when omitting temporal aliasing). For SGG, it is demonstrated that, with realistic instrument assumptions, one is still mostly insensitive to time-variable gravity and not competitive with the SST principle. However, due to the improved instrument sensitivity of quantum gradiometers compared to the GOCE mission, static gravity field solutions can be improved significantly.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003630","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

On the Love Numbers of an Andrade Planet 关于安德拉德星球的爱情数字

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-09-01 DOI: 10.1029/2024EA003779

Anastasia Consorzi, Daniele Melini, Juan Luis González-Santander, Giorgio Spada

{"title":"On the Love Numbers of an Andrade Planet","authors":"Anastasia Consorzi, Daniele Melini, Juan Luis González-Santander, Giorgio Spada","doi":"10.1029/2024EA003779","DOIUrl":"https://doi.org/10.1029/2024EA003779","url":null,"abstract":"The Andrade rheological model is often employed to describe the response of solar system or extra-solar planets to tidal perturbations, especially when their properties are still poorly constrained. While for uniform planets with steady-state Maxwell rheology the analytical form of the Love numbers was established long ago, for the transient Andrade rheology no closed-form solutions have been yet determined, and the planetary response is usually studied either semi-analitically in the frequency domain or numerically in the time domain. Closed-form expressions are potentially important since they could provide insight into the dependence of Love numbers upon the model parameters and the time-scales of the isostatic readjustment of the planet. First, we focus on the Andrade rheological law in 1-D and we obtain a previously unknown explicit form, in the time domain, for the relaxation modulus in terms of the higher Mittag-Leffler transcendental function Eα,β(z) that generalizes the exponential function. Second, we consider the general response of an incompressible planetary model — often referred to as the “Kelvin sphere” — studying the Laplace domain, the frequency domain and the time domain Love numbers by analytical methods. Through a numerical approach, we assess the effect of compressibility on the Love numbers in the Laplace and frequency domains. Furthermore, exploiting the results obtained in the 1-D case, we establish closed-form — although not elementary — expressions of the time domain Love numbers and we discuss the frequency domain response of the Kelvin sphere with Andrade rheology analytically.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003779","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Freshly Developed Low-Latitude Postmidnight-To-Dawn F-Region Ionospheric Irregularities Over China on 13 November 2015 2015年11月13日中国上空新出现的后半夜至黎明低纬度F区电离层不规则现象

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-08-31 DOI: 10.1029/2023EA003380

Yaxian Li, Wanlin Gong, Chunxiao Yan, Kai Zhu, Min Zhang, Qiang Zhang

{"title":"Freshly Developed Low-Latitude Postmidnight-To-Dawn F-Region Ionospheric Irregularities Over China on 13 November 2015","authors":"Yaxian Li, Wanlin Gong, Chunxiao Yan, Kai Zhu, Min Zhang, Qiang Zhang","doi":"10.1029/2023EA003380","DOIUrl":"https://doi.org/10.1029/2023EA003380","url":null,"abstract":"In this study, the evolutional features and underlying driving mechanisms of the postmidnight-to-dawn equatorial plasma bubble (EPB) irregularities during the weak geomagnetic activity period on 13 November 2015 were investigated based on the multiple satellite and ground-based observations. By using the coherent scatter radar operating at very high frequency at Fuke (19.5°N, 109.1°E, dip latitude 14.4°N), China, it was found that the freshly developed field-aligned irregularities (FAIs) occurred within the radar's field of view around ∼04:37 LT and sustained for more than 40 min. The remarkable EPB-related density and total electron content (TEC) depletions measured by the satellite and GNSS receivers were also observed, which indicates the persistence of EPB irregularities until ∼06 LT. The significant elevation of bottomside F-layer's virtual height obtained by the Digisonde at Fuke as well as the upward vertical F-layer plasma drifts derived from a nearby Digisonde at Sanya (18.4°N, 109.6°E, dip latitude 13.1°N) both imply the existence of strong eastward perturbation electric fields after local midnight. These findings suggest that the collective effects of eastward overshielding penetration electric field (PEF) resulted from the substorm onset and rapid northward turning of the interplanetary magnetic field (IMF) Bz, surpassed the role of westward undershielding prompt penetration electric field (PPEF) induced by the southward turning of IMF Bz. Thus, the former predominated in modulating the equatorial/low-latitude zonal electric fields and raised the F-layer considerably, which consequently boosted the growth of R-T instability and created the favorable conditions for the postmidnight-to-dawn EPBs development.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023EA003380","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Evaluation of Modeled Diurnal Warming Estimates for Application to Producing Sea Surface Temperature Analyses 评估应用于海面温度分析的模拟昼夜温差估算值

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-08-29 DOI: 10.1029/2024EA003619

Gary A. Wick, Sandra L. Castro, Andrew Harris, Jonathan Mittaz

{"title":"Evaluation of Modeled Diurnal Warming Estimates for Application to Producing Sea Surface Temperature Analyses","authors":"Gary A. Wick, Sandra L. Castro, Andrew Harris, Jonathan Mittaz","doi":"10.1029/2024EA003619","DOIUrl":"https://doi.org/10.1029/2024EA003619","url":null,"abstract":"Accurate knowledge of the amount of diurnal warming present in sea surface temperature (SST) observations at different times and effective depths is important for multiple applications including the production of blended SST analyses. This work explores the ability of a modified Kantha-Clayson-type one-dimensional mixed layer ocean model with wave effects to accurately simulate the observed diurnal warming amplitude over a global grid when forced with coarse resolution numerical weather prediction (NWP) outputs. The sensitivity of the modeled diurnal amplitudes to multiple adjustable parameters and model configurations is evaluated to determine whether a preferred configuration can be identified that yields reliable predictions. The accuracy of the predictions is determined through comparison against estimates from operational SST retrievals from geostationary satellites. The results show that a single configuration can yield predictions that reproduce the observed range of diurnal warming amplitudes across a range of seasons and locations and an accurate occurrence frequency of the largest amplitude events. Simulated amplitudes fall along the one-to-one line with observations but with significant scatter due to factors including positioning of the NWP fluxes. The identified configuration is also shown to favorably reproduce diurnal warming observations from multiple research cruises. Overall uncertainty of the simulated diurnal warming amplitude across the different tests ranges between 0.4 K for all observations to ∼1 K for the largest warming events. While the focus is not on model comparisons, the results show improved performance relative to other models. Use of the model appears warranted but the associated uncertainty must be considered.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003619","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Rapid Identification of Greigite in Lacustrine Sediments Using SIRM/χ and χARM: Insights From the Cuo E Core, Tibetan Plateau, China 利用 SIRM/χ 和 χARM 快速鉴定湖相沉积物中的绿泥石：中国青藏高原错峨岩心的启示

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-08-29 DOI: 10.1029/2024EA003508

Shengchang Ding, Mark J. Dekkers, Mingkun Li, Qi Zhao, Yi Yan, Zhaoyu Zhu

{"title":"Rapid Identification of Greigite in Lacustrine Sediments Using SIRM/χ and χARM: Insights From the Cuo E Core, Tibetan Plateau, China","authors":"Shengchang Ding, Mark J. Dekkers, Mingkun Li, Qi Zhao, Yi Yan, Zhaoyu Zhu","doi":"10.1029/2024EA003508","DOIUrl":"https://doi.org/10.1029/2024EA003508","url":null,"abstract":"The Cuo E (CE) core contains the entire Quaternary stratigraphy of the CE Lake (31°24′–31°.32′ N, 91°28′–91°33′E, Tibetan Plateau, China). Here, we study the magnetic properties of 1,748 samples from the CE core, combined with scanning electron microscopy and X-ray energy dispersive spectrometer analysis on selected samples. The main magnetic minerals appear to be magnetite and greigite. To further quantify the presence of greigite in CE core, 84 samples were analyzed using rock magnetism in more detail including: susceptibility (χ) versus temperature, coercivity component analysis of acquisition curves of the isothermal remanent magnetization (IRM), and principal component analysis of the first-order reversal curve (FORC) diagrams. The greigite content and saturation IRM over susceptibility (SIRM/χ) appear to be exponentially related. SIRM/χ can be used as greigite concentration indicator. We also propose a rapid way to identify greigite in the CE core: When SIRM/χ increases and anhysteretic remanent susceptibility (χARM) increases only slowly, the sample contains greigite. Samples with SIRM/χ < 15 kA/m also follow this relation. This greigite detection method has a lower limit of detection than the traditionally used SIRM/χ parameter. It is also faster than FORC analysis and thus particularly suitable for analysis of large sample collections. Twenty greigite-bearing layers were identified in the CE core using this method. The location of the Jaramillo subchron in the CE core is controversial in the currently available magnetostratigraphy, possibly related to the presence of greigite in this core interval.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003508","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Quantification of Crystal Chemistry of Fe-Mg Carbonates by Raman Microspectroscopy and Near-Infrared Remote Sensing 利用拉曼显微光谱学和近红外遥感技术量化碳酸铁镁酯的晶体化学性质

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-08-28 DOI: 10.1029/2024EA003666

Pierre Beck, Olivier Beyssac, Bernard Schmitt, Clement Royer, Lucia Mandon, Eglantine Boulard, Nicolas Rividi, Edward A. Cloutis

{"title":"Quantification of Crystal Chemistry of Fe-Mg Carbonates by Raman Microspectroscopy and Near-Infrared Remote Sensing","authors":"Pierre Beck, Olivier Beyssac, Bernard Schmitt, Clement Royer, Lucia Mandon, Eglantine Boulard, Nicolas Rividi, Edward A. Cloutis","doi":"10.1029/2024EA003666","DOIUrl":"https://doi.org/10.1029/2024EA003666","url":null,"abstract":"On Earth, carbonate minerals are widely used as recorders of the geological environments in which they formed. Here, we present a method designed to retrieve the crystal chemistry of Fe-Mg carbonate minerals using infrared remote sensing or Raman spectroscopy. We analyzed a suite of well-characterized Fe-Mg carbonate minerals for which Raman spectra were obtained in two different laboratories, and IR spectra were measured in reflectance and transmission from the visible range to 25-μm. We built calibration lines for the dependence of fundamental and harmonic vibrational modes position to the Mg# (defined as Mg# = 100 × Mg/(Mg + Fe + Ca + Mn)). These calibrations should enable retrieval of Mg# based on spectroscopic observations with a typical accuracy of 10. We discuss the framework of applicability of these calibrations and apply them to a typical CRISM spectrum of carbonates from the Nilli Fossae region of Mars.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003666","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Ray and Halo Impact Craters on Ganymede: Fingerprint for Decoding Ganymede's Crustal Structure 木卫三上的射线和光环撞击坑：解码木卫三地壳结构的指纹

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-08-28 DOI: 10.1029/2024EA003541

N. R. Baby, T. Kenkmann, K. Stephan, R. J. Wagner, E. Hauber

{"title":"Ray and Halo Impact Craters on Ganymede: Fingerprint for Decoding Ganymede's Crustal Structure","authors":"N. R. Baby, T. Kenkmann, K. Stephan, R. J. Wagner, E. Hauber","doi":"10.1029/2024EA003541","DOIUrl":"https://doi.org/10.1029/2024EA003541","url":null,"abstract":"Impact craters are a unique tool not only for inferring ages of planetary surfaces and examining geological processes, but also for exploring subsurface properties. We use ejecta blankets as proxies to obtain insights into the subsurface characteristics and the vertical stratification of Ganymede's icy crust. We investigated 36 prominent ray and halo craters using images acquired during the Voyager, Galileo, and Juno spacecraft missions. These craters exhibit diverse characteristics, including dark rays, bright rays, or their combination, in both continuous and discontinuous patterns as well as dark and bright halos. Dark halo craters (DHCs) have the smallest radial extents of their dark ejecta deposits, while dark ray craters (DRCs) have the largest. DRCs in dark terrain suggest a thickness of less than ∼2 km based on their excavation depths. DRCs and DHCs craters located in light terrain (LT) reveal significant heterogeneity in the uppermost portions of icy crust at various locations. DRCs and DHCs in the LT require the presence of at least one layer of dark material. This is the case if the LT is formed by tectonic rifting and graben formation. In contrast, if the LT is formed by tectonic spreading, bright halo and ray craters are expected to form.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003541","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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