Earth and Space Science最新文献_第9页

MTAHG and MTBHG: Modified Approaches for Interpreting Gravity Data MTAHG和mthhg：修正的重力数据解释方法

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-08 DOI: 10.1029/2024EA003900

Hazel Deniz Toktay, Hanbing Ai, Ahmad Alvandi, Kejia Su, Jinlei Li

{"title":"MTAHG and MTBHG: Modified Approaches for Interpreting Gravity Data","authors":"Hazel Deniz Toktay, Hanbing Ai, Ahmad Alvandi, Kejia Su, Jinlei Li","doi":"10.1029/2024EA003900","DOIUrl":"https://doi.org/10.1029/2024EA003900","url":null,"abstract":"Gravity anomaly maps often contain spatially overlapping signatures from numerous sources, each with varying shapes, depths, and density contrasts. Locating these signatures using edge detection techniques is crucial for geological structural interpretation and imaging of horizontal boundaries. This paper proposes two effective edge detection tools: one combining the balanced total horizontal gradient (BHG), and the hyperbolic tangent function, abbreviated as “MTBHG”; and the other combining the tilt angle of the total horizontal gradient (TAHG) and the hyperbolic tangent function, abbreviated as “MTAHG.” Additionally, the Modified Non-Local Means (MNLM) filter was applied to suppress possible noise effects amplified by the gradient calculation process. Synthetic tests validated that the MTAHG and MTBHG detectors outperform other representative detectors. Two high-resolution gravity data sets from the Western Carpathians in Slovakia and the Witwatersrand Basin in South Africa were used to test the applicability of the modified methods. Results show that the modified detectors achieve superior edge delineation and avoid creating spurious anomalies or artifacts even in the presence of unwanted noise interference. Furthermore, by eliminating false tilt-depth (TD) solutions via the edge detection results, we enhance the accuracy of depth estimates and facilitate the credible identification of both horizontal and vertical structure distributions.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003900","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793787","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

Comprehensive Warming Assessment in a High-Altitude Region: Observational Evidence From Qinghai Province, Northwest China 高海拔地区气候变暖的综合评估：中国西北部青海省的观测证据

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-08 DOI: 10.1029/2025EA004276

Xiang Zou, Guangxue Guo, Shugui Hou

{"title":"Comprehensive Warming Assessment in a High-Altitude Region: Observational Evidence From Qinghai Province, Northwest China","authors":"Xiang Zou, Guangxue Guo, Shugui Hou","doi":"10.1029/2025EA004276","DOIUrl":"https://doi.org/10.1029/2025EA004276","url":null,"abstract":"The recent trends of global warming slowdown have garnered increased attention in the field of climate science. The Qinghai province, a high-altitude region in northwest China, is highly sensitive to climate change, and understanding its response to the warming slowdown is crucial. Using data from 34 meteorological stations between 1960 and 2016, we analyzed the temperature variations in Qinghai via Mann-Kendall trend analysis, Sen's slope method, and ANUSPLIN interpolation. The findings were compared with data from other regions to examine the response of temperature variations during the warming slowdown. Furthermore, we explored the influence of large-scale climate patterns on temperature variation using wavelet transform coherence analysis. The results indicated that both annual and seasonal temperatures exhibit a consistent warming trend, with a significant upward shift post ∼2,000. The most pronounced warming occurred in the autumn minimum and winter maximum temperatures. Temperature magnitudes were lower in high-altitude areas in the southwest, southeast, and northeast, and higher in the relatively lower-altitude areas in the east and northwest of Qinghai. The warming trend exhibited a clear southeast-to-northwest gradient, reflecting both latitudinal and meridional distribution characteristics. During the warming slowdown, a hiatus phenomenon was observed in the annual, autumn, and winter temperatures of northern Qinghai, although the overall warming trend remained consistent with that of the Tibetan Plateau. The Arctic oscillation was found to play a key role in influencing the annual mean temperatures in the region, while the Pacific decadal oscillation may be another climatic pattern contributing to the observed hiatus period.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025EA004276","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793902","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

Landslide Detection and Deformation Control Analysis in the Reservoir Area of Wudongde Hydropower Station by InSAR Observations 武东德水电站库区InSAR观测滑坡检测及变形控制分析

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-07 DOI: 10.1029/2024EA004002

Fan Wen, Chuang Song, Zhenhong Li, Chen Yu, Bo Chen, Jiantao Du, Zhenjiang Liu, Ying Wen

{"title":"Landslide Detection and Deformation Control Analysis in the Reservoir Area of Wudongde Hydropower Station by InSAR Observations","authors":"Fan Wen, Chuang Song, Zhenhong Li, Chen Yu, Bo Chen, Jiantao Du, Zhenjiang Liu, Ying Wen","doi":"10.1029/2024EA004002","DOIUrl":"https://doi.org/10.1029/2024EA004002","url":null,"abstract":"After the construction of hydropower station, reservoir impoundment can directly affect the movement status of landslides within the reservoir area. Detecting landslides and revealing the relationship between landslide deformation and driving forces is crucial for reducing the threat of landslide hazards to residents and hydropower station in reservoir areas. In this study, active landslides in the reservoir areas of Wudongde Hydropower Station, were detected combining Interferometric Synthetic Aperture Radar observations and optical image interpretation. Through detailed verification and screening, we identified 128 landslides, most of which are located at an altitude of 1,000–2,000 m, with slopes of 20–35°. After reservoir impoundment, wading landslides were found to be more prone to change state than non-wading landslides. As the primary control factor of wading landslides, reservoir impoundment can either accelerate or decelerate landslide deformation depending on the equilibrium state between soil saturation and hydrostatic pressure. Furthermore, wavelet transform analysis indicates that rainfall and reservoir level significantly contribute to the seasonal oscillations of landslide deformation. The results of this study can contribute to the prevention of landslide hazards in the Wudongde reservoir area and other areas of the world where large hydropower stations have been constructed.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA004002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143787178","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

Automatic Identification of Past Radiation Belts Electron Enhancement Events Using a Ground-Based Parameter 利用地基参数自动识别过去辐射带电子增强事件

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-04 DOI: 10.1029/2024EA003945

Guillerme Bernoux, Gautier Nguyen, Angélica Sicard, Vincent Maget

{"title":"Automatic Identification of Past Radiation Belts Electron Enhancement Events Using a Ground-Based Parameter","authors":"Guillerme Bernoux, Gautier Nguyen, Angélica Sicard, Vincent Maget","doi":"10.1029/2024EA003945","DOIUrl":"https://doi.org/10.1029/2024EA003945","url":null,"abstract":"We propose a new method for automatically identifying radiation belt electron enhancement events using Ca, a ground-based 1D surrogate index for the global dynamics of the electron radiation belts. Our method improves event identification by accurately determining start and end dates, considering intensification and return-to-equilibrium phases, and resolving ambiguity between single, longer-lasting events and multiple, successive events. The events detected after 1995, are automatically associated with possible physical driving causes, such as interplanetary coronal mass ejections and stream interaction regions. The resulting list of events is consistent with our understanding of how radiation belts respond to interplanetary drivers, in terms of event intensity, duration, and distribution over the solar cycle. The list of events from 1868 to 2021 is publicly available for statistical analyses of radiation belt climatology, constructing space weather forecasting models, and selecting periods of interest for studying physical processes.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770175","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 Near-Surface Specific Humidity and Air Temperature From Atmospheric Infrared Sounder (AIRS) Over Oceans 海洋上空大气红外测深仪对近地表比湿度和空气温度的评估

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-02 DOI: 10.1029/2024EA003856

Weikang Qian, Yixin Wen, Shang Gao, Zhi Li, Jesse Kisembe, Haotong Jing

{"title":"Evaluation of Near-Surface Specific Humidity and Air Temperature From Atmospheric Infrared Sounder (AIRS) Over Oceans","authors":"Weikang Qian, Yixin Wen, Shang Gao, Zhi Li, Jesse Kisembe, Haotong Jing","doi":"10.1029/2024EA003856","DOIUrl":"https://doi.org/10.1029/2024EA003856","url":null,"abstract":"The state of the near-surface atmosphere, especially air temperature (AT) and specific humidity (SH), has profound effects on human health, ecosystem function, and global energy flows. Accurate measurements of AT and SH are essential for weather forecasting, climate modeling, data assimilation, and trend assessment. The Atmospheric Infrared Sounder (AIRS) provides global estimates of near-surface AT and SH estimates, with continuous improvements in accuracy leading to significant reductions in error rates. However, existing studies have not systematically validated AIRS near-surface products in both temporal and spatial perspectives, especially over oceans. This study aims to address this gap by using the International Comprehensive Ocean–Atmosphere Data Set as a ground-based reference to evaluate AIRS near-surface AT and SH over the ocean from the V7 Level 2 product. Our results show an overall underestimation of near-surface AT and SH. Spatially, higher uncertainties, indicated by high root-mean-square error, near land were found. In terms of seasonality and diurnal variation, we found that the products perform better during winter and at night on a global scale, although there are regional exceptions. In terms of temporal variation, the estimation errors show remarkable stability over a 20-year period, demonstrating the ability of AIRS to capture general temporal characteristics. These findings underscore the importance of validating and understanding the retrieval uncertainties of AIRS near-surface products, paving the way for improved climatological applications.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749634","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

In Situ Calculation of Spaceflight Magnetometer Coupling Coefficients for Interference Removal Using the Reduction Algorithm for Magnetometer Electromagnetic Noise (RAMEN) 基于磁强计电磁噪声（RAMEN）降噪算法的航天磁强计耦合系数原位计算

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-04-01 DOI: 10.1029/2024EA003914

Alex P. Hoffmann, Mark B. Moldwin

{"title":"In Situ Calculation of Spaceflight Magnetometer Coupling Coefficients for Interference Removal Using the Reduction Algorithm for Magnetometer Electromagnetic Noise (RAMEN)","authors":"Alex P. Hoffmann, Mark B. Moldwin","doi":"10.1029/2024EA003914","DOIUrl":"https://doi.org/10.1029/2024EA003914","url":null,"abstract":"Space-based in situ magnetic field measurements are often limited by spacecraft-generated interference, known as stray magnetic fields. These fields, generated by currents from spacecraft subsystems, are frequently several times stronger than the ambient magnetic field signals of interest. To mitigate this, strict magnetic cleanliness, long mechanical booms, and at least two magnetometers are typically necessary to eliminate the spacecraft-generated magnetic interference. When two magnetometers are placed collinearly on a boom, gradiometry can be performed by modeling the spacecraft's field as a dipole and subtracting it from the magnetometer measurements. However, this technique requires careful preflight characterization of the spacecraft's magnetic field to determine the dipole coupling coefficients and sufficient boom length. This process is time-intensive, costly, and prone to error due to the changing nature of a spacecraft magnetic field environment in operation. We propose a novel method for in situ calculation of the gradiometric coupling coefficients, called the Reduction Algorithm for Magnetometer Electromagnetic Noise (RAMEN). RAMEN utilizes single-source point analysis and the time-frequency content of the magnetometer signals to identify stray magnetic field signals and calculate the gradiometric coupling coefficients. Through two Monte Carlo simulations, we demonstrate that the RAMEN gradiometry algorithm matches gradiometry with preflight coupling coefficient estimation. Additionally, we apply the RAMEN algorithm to noisy magnetometer data from the Venus Express spacecraft to demonstrate its use. The RAMEN method enhances the fidelity of spaceborne magnetic field observations using gradiometry and reduces the burden of arduous preflight spacecraft magnetic characterization.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003914","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740977","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

Empirical Quantification of Topobathymetric Lidar System Resolution Using Modulation Transfer Function 利用调制传递函数对地形激光雷达系统分辨率进行经验量化

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-03-27 DOI: 10.1029/2024EA004098

K. W. Sacca, J. P. Thayer

{"title":"Empirical Quantification of Topobathymetric Lidar System Resolution Using Modulation Transfer Function","authors":"K. W. Sacca, J. P. Thayer","doi":"10.1029/2024EA004098","DOIUrl":"https://doi.org/10.1029/2024EA004098","url":null,"abstract":"Topobathymetric scanning lidar deployed on unmanned aircraft systems is a powerful tool for high-resolution mapping of the dynamic interface between topography and bathymetry. However, standardized methods for empirical resolution validation have not been widely adopted across lidar applications. While theoretical models of idealized lidar sampling resolution can be used to describe topographical resolution, misrepresented or unknown behaviors in an instrument, platform, or environment can degrade expected performance or introduce georeferencing inaccuracies. Furthermore, bathymetric resolution is strongly dependent on water surface and column conditions. Thus, only empirical methods for evaluating resolution will provide reliable estimates for both topographic and bathymetric surveys. Presented is an extension of standard modulation transfer function (MTF) methods used by passive imaging systems applied to high-resolution scanning lidar. Compact retroreflectors characterized as point and line sources are employed to empirically assess effective lidar system resolution through MTF analysis in topographic and bathymetric scenes. These targets enable MTF analyses using height measurements without reliance on intensity data, promoting widespread applicability among lidar systems. Empirical MTFs calculated using these targets are compared against theory-derived counterparts as empirical measurements elucidate influences by elements that are unknown or difficult to model. Simulated point cloud data were incorporated into theoretical MTF descriptions to better represent empirically-derived topographic MTFs, revealing mirror pointing uncertainties in the across-track axis. Similarly, theoretical bathymetric MTFs augmented with simulated, subaqueous data enabled water surface slope estimation using empirical measurements of submerged retroreflector targets, where rough water surfaces strongly influenced beam steering and the corresponding point spread MTFs.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA004098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707342","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

Automatic Receiver Function Picking Using Fuzzy C-Means Clustering 基于模糊c均值聚类的自动接收函数选取

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-03-26 DOI: 10.1029/2024EA003859

Neng Xiong, Fenglin Niu, Hongrui Qiu, Yuyan Liu, Wenpei Miao

{"title":"Automatic Receiver Function Picking Using Fuzzy C-Means Clustering","authors":"Neng Xiong, Fenglin Niu, Hongrui Qiu, Yuyan Liu, Wenpei Miao","doi":"10.1029/2024EA003859","DOIUrl":"https://doi.org/10.1029/2024EA003859","url":null,"abstract":"Computing receiver function (RF) from teleseismic records can be affected by noise present in the seismic waveforms, and therefore, visual inspection is still preferred for quality control purposes. However, human handpicking RF lacks consistency and requires a significant amount of time and human labor. From manually picked RF data sets, we have identified 4 features that can effectively separate the good and bad RFs. Using these selected features, we have developed a fuzzy clustering-based method to automate the classification of RFs into good or bad quality. This method has been applied to two RF data sets in China–computed from broadband arrays in the Tanlu fault zone and northeast China region. Compared to the hand-picked result, our clustering-based classifier achieves great recall and precision scores exceeding 93% and 83.4%, respectively. These robust classification results suggest that the 4 identified physical attributes could serve as a standard criterion for guiding RF picking. Furthermore, our efficient clustering-based automatic RF picking method holds significant promise for RF imaging with large numbers of seismic stations.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698926","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

Estimating Wind Direction and Wind Speed Over Lakes With Surface Water Ocean Topography and Sentinel-1 Satellite Observations 利用表层海洋地形和Sentinel-1卫星观测估算湖泊风向和风速

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-03-25 DOI: 10.1029/2024EA003971

Katie A. McQuillan, George H. Allen, Jessica Fayne, Huilin Gao, Jida Wang

{"title":"Estimating Wind Direction and Wind Speed Over Lakes With Surface Water Ocean Topography and Sentinel-1 Satellite Observations","authors":"Katie A. McQuillan, George H. Allen, Jessica Fayne, Huilin Gao, Jida Wang","doi":"10.1029/2024EA003971","DOIUrl":"https://doi.org/10.1029/2024EA003971","url":null,"abstract":"Wind at the water-air interface is an important driver of hydrologic and biogeochemical processes in lakes. Satellite synthetic aperture radar (SAR) is commonly used over the ocean to retrieve wind fields using backscatter coefficients which are sensitive to wind-driven surface water roughness; however, its application to lakes has been largely unexplored. Here we assess the utility of SAR to retrieve wind fields specifically for lakes. We estimated wind direction from SAR backscatter using the Modified Local Gradient method for Surface Water Ocean Topography (SWOT) and Sentinel-1 data. The estimated wind direction was then used as an input into a C-band geophysical modeling function (GMF) to invert wind speed from Sentinel-1 data. Comparisons between SWOT backscatter and in situ wind speeds were used to provide a foundation for understanding how SWOT could be used to study wind speeds. Using buoy data for validation, we found wind direction (1 km) mean absolute error (MAE) ranged from 31° to 40° for Sentinel-1 and 28° to 38° for SWOT. Sentinel-1 wind speed (100 m) MAE ranged from 1.05 to 2.09 m/s. These retrievals were more accurate and at higher resolution compared to global reanalysis dataset ERA5 (0.25°), with wind direction MAE from 23° to 50° and wind speed MAE from 1.49 to 2.35 m/s. SWOT backscatter sensitivity to wind speed depended on incidence angle, and demonstrated utility for developing a GMF for lakes. These methods could be used to better understand wind dynamics globally, especially over small lakes and in data poor regions.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003971","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698978","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 Fast and Fine-Resolution Location Method for Lightning Channels Based on Time Series Segmented Feature of Low Frequency Signal 基于低频信号时间序列分割特征的闪电通道快速精细定位方法

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2025-03-21 DOI: 10.1029/2024EA003896

Jingxuan Wang, Yang Zhang, Yanfeng Fan, Yijun Zhang, Dong Zheng, Weitao Lyu

{"title":"A Fast and Fine-Resolution Location Method for Lightning Channels Based on Time Series Segmented Feature of Low Frequency Signal","authors":"Jingxuan Wang, Yang Zhang, Yanfeng Fan, Yijun Zhang, Dong Zheng, Weitao Lyu","doi":"10.1029/2024EA003896","DOIUrl":"https://doi.org/10.1029/2024EA003896","url":null,"abstract":"Most real-time lightning location systems are based on feature matching to locate lightning, but they often lack the ability to locate lightning channels. To achieve lightning channel location based on feature matching, a new location algorithm is proposed by utilizing time series segmented feature to match lightning pulses. The features of waveform time series do not require complex signal processing, making it suitable for real-time and fast location. Compared with the location results of the other three existing methods for a lightning event, the new method achieves the highest matching efficiency of 28.4% and demonstrates fine channel location capability. For a thunderstorm process, the new method also has the highest location efficiency, as well as the highest number of valid location points per second, and the lowest computation time of per valid location point, which are 26%, 39.6, and 0.025s, respectively. The new algorithm also provides better location results for irregular pulse clusters, which more realistically depict the development process of downward leader compared to the location methods based on encoding feature matching. This may be caused by the fact that the time series segmented feature can correctly represent the change trend of the signal under the condition of low signal-to-noise ratio.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003896","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143689457","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