Earth and Space Science最新文献_第10页

Trends of Summer Lake Surface Water Temperature on the Tibetan Plateau and Their Response to Climate Change 青藏高原夏季湖泊地表水温变化趋势及其对气候变化的响应

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-18 DOI: 10.1029/2024EA003910

Yi Shi, Anning Huang, Yang Wu, Lazhu, Lijuan Wen

{"title":"Trends of Summer Lake Surface Water Temperature on the Tibetan Plateau and Their Response to Climate Change","authors":"Yi Shi, Anning Huang, Yang Wu,  Lazhu, Lijuan Wen","doi":"10.1029/2024EA003910","DOIUrl":"https://doi.org/10.1029/2024EA003910","url":null,"abstract":"The Tibetan Plateau (TP) is covered by numerous lakes, and lake surface water temperature (LSWT) is an essential indicator of climate change, while few observations hinder our understanding of LSWT variation and its causes over TP. This study aims to simulate the summer LSWT long-term trends of 81 TP lakes during 1980–2018 and quantify the impacts and contributions of atmospheric variables. Results show that TP lakes warmed with 0.32°C decade−1 on average. Northern TP lakes warmed faster than the southern ones (0.44 vs. 0.16°C decade−1) due to stronger trends of atmospheric variables and higher sensitive of colder lakes to atmospheric changes. 55 (67.9%) lakes of the total lakes studied in current work warmed slower than air due to weakened shortwave radiation (SW↓). Attribution analysis suggests that the air warming and wetting over TP dominate lakes' warming. Regarding synthesis contributions, air warming contributed 79.3%, with increased surface air temperature (SAT) and downward longwave radiation (LW↓) accounting for 41.6% and 37.7%, respectively, and air wetting indicated by increased surface specific humidity (SSH) contributed 39.0%, followed by a positive contribution (16.8%) from declined wind speed (WS). The negative contribution (−35.1%) from weakened SW↓ nearly counterbalances the positive effects of increased LW↓. 55.1% of the total synthesis contribution arises from the cross contribution through interactions among atmospheric variables and is mainly reflected in SAT and SSH, accounting for 26.8% and 24.8%, respectively. The findings enhance understanding of climate change impacts on lake systems and offer insights for lake resource management.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003910","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861452","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

Changing Extreme Precipitation Patterns in Nepal Over 1971–2015 1971-2015 年尼泊尔极端降水模式的变化

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-15 DOI: 10.1029/2024EA003563

Yinxue Luo, Lang Wang, Chenxi Hu, Lu Hao, Ge Sun

{"title":"Changing Extreme Precipitation Patterns in Nepal Over 1971–2015","authors":"Yinxue Luo, Lang Wang, Chenxi Hu, Lu Hao, Ge Sun","doi":"10.1029/2024EA003563","DOIUrl":"https://doi.org/10.1029/2024EA003563","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 This paper provides a comprehensive and comparative analysis of extreme precipitation patterns from 1971 to 2015 in Nepal, a data scarce, but “hot spot” region in global climate change. We compare in-situ observations and gridded precipitation data from the Asian Precipitation Highly Resolved Observational Data Integration Toward Evaluation of Water Resources (APHRODITE). Using 11 precipitation indices, we show that high-intensity (RX1day, R95pTOT, R99pTOT) and frequency-related indices (R10 mm, R20 mm) have decreased but annual maximum consecutive dry and wet days have increased. Observations affirm these trends found by the APHRODITE, but show smaller magnitudes likely due to differences in measurements at locations made below the 3,000 m elevation line. Spatially, the relatively dry western region has become wetter, and the relatively wet eastern region has become drier post-2003. The weakening of the South Asia Monsoon circulation, particularly assessed by the Webster and Yang Monsoon Index, correlates strongly with extreme precipitation indices. Changes in upper-level jet and associated lower-level monsoon trough are identified as critical factors influencing the extreme precipitation trend post-2003. This study is the first to confirm the efficacy of APHRODITE in providing spatial and temporal precipitation patterns in a data-limited region. We conclude that monsoon weakened circulations and changes in regional wind fields play dominant roles in the long-term temporal and spatial trends of extreme precipitation in Nepal. The reduced precipitation extremes in the wet eastern region may somewhat lessen severe flooding and erosion, but the drier western region may face heightened risks in precipitation-related hazards in Nepal.\u0000 </section>\u0000 </div>","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003563","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861178","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

InSAR Observations of Construction-Induced Coastal Subsidence on Miami's Barrier Islands, Florida InSAR 对佛罗里达州迈阿密壁垒岛施工引起的海岸沉降的观测结果

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-13 DOI: 10.1029/2024EA003852

Farzaneh Aziz Zanjani, Falk Amelung, Andreas Piter, Khaled Sobhan, Amin Tavakkoliestahbanati, Gregor P. Eberli, Mahmud Haghshenas Haghighi, Mahdi Motagh, Pietro Milillo, Sara Mirzaee, Antonio Nanni, Esber Andiroglu

{"title":"InSAR Observations of Construction-Induced Coastal Subsidence on Miami's Barrier Islands, Florida","authors":"Farzaneh Aziz Zanjani, Falk Amelung, Andreas Piter, Khaled Sobhan, Amin Tavakkoliestahbanati, Gregor P. Eberli, Mahmud Haghshenas Haghighi, Mahdi Motagh, Pietro Milillo, Sara Mirzaee, Antonio Nanni, Esber Andiroglu","doi":"10.1029/2024EA003852","DOIUrl":"https://doi.org/10.1029/2024EA003852","url":null,"abstract":"This study utilizes Interferometric Synthetic Aperture Radar (InSAR) to examine subsidence along the coastal strip of the Miami barrier islands from 2016 to 2023. Using Sentinel-1 data, we document vertical displacements ranging from 2 to 8 cm, affecting a total of 35 coastal buildings and their vicinity. About half of the subsiding structures are younger than 2014 and at the majority of them subsidence decays with time. This correlation suggests that the subsidence is related to construction activities. In northern and central Sunny Isles Beach, where 23% of coastal structures were built during the last decade, nearly 70% are experiencing subsidence. The majority of the older subsiding structures show sudden onset or sudden acceleration of subsidence, suggesting that this is due to construction activities in their vicinity; we have identified subsidence at distance of 200 m, possibly up to 320 m, from construction sites. We attribute the observed subsidence to load-induced, prolonged creep deformation of the sandy layers within the limestone, which is accelerated, if not instigated, by construction activities. Distant subsidence from a construction site could indicate extended sandy deposits. Anthropogenic and natural groundwater movements could also be driving the creep deformation. This study demonstrates that high-rise construction on karstic barrier islands can induce creep deformation in sandy layer within the limestone succession persisting for a decade or longer. It showcases the potential of InSAR technology for monitoring both building settlement and structural stability.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003852","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861213","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

Long Period Seismology on Titan in the Presence of a Methane Clathrate Lid 甲烷包合物盖存在下土卫六上的长周期地震学

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-07 DOI: 10.1029/2024EA003703

Andrea S. Bryant, Mark P. Panning, Angela G. Marusiak

{"title":"Long Period Seismology on Titan in the Presence of a Methane Clathrate Lid","authors":"Andrea S. Bryant, Mark P. Panning, Angela G. Marusiak","doi":"10.1029/2024EA003703","DOIUrl":"https://doi.org/10.1029/2024EA003703","url":null,"abstract":"Previous 1-D spherically symmetric seismic modeling studies have shown that in the presence of a clathrate lid on Titan significant thermal profile differences result, particularly in comparison to a pure water ice shell. In turn, these thermal differences would lead to notable changes in the waveform amplitudes and seismic phase arrival times. In this study we investigate the feasibility of using surface waves dispersion to explore the structure of Titan's ice shell. We investigate the ability to measure and observe the frequency-dependent signals (0.003–0.100 Hz) and their utility in being able to detect existence of a methane-clathrate lid. We find that we are unlikely to resolve the clathrate-lid's existence using long-period techniques, and this could be a limitation for studying very thick ice shells (<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>></mo>\u0000 <mo>≈</mo>\u0000 </mrow>\u0000 <annotation> ${ >} approx $</annotation>\u0000 </semantics></math> 20 km) of icy ocean worlds. We did resolve the frequency range of flexural waves transitioning to a Stoneley wave (mode) in the fundamental mode, and see a Rayleigh wave in the first overtone for a 100 km ice shell on Titan for a simulated quake.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860347","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

Moisture Sources and Atmospheric Circulation Patterns for Extreme Rainfall Event Over North China Plain From 29 July to 2 August 2023 2023年7月29日- 8月2日华北平原极端降水事件的水汽源和大气环流特征

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-07 DOI: 10.1029/2024EA003956

Hui Guo, Wanting Hu, Chen Yang, Fang Wan

{"title":"Moisture Sources and Atmospheric Circulation Patterns for Extreme Rainfall Event Over North China Plain From 29 July to 2 August 2023","authors":"Hui Guo, Wanting Hu, Chen Yang, Fang Wan","doi":"10.1029/2024EA003956","DOIUrl":"https://doi.org/10.1029/2024EA003956","url":null,"abstract":"Two years following the extreme rainfall event in Henan Province in July 2021, North China was struck by another significant rainfall episode in late July and early August 2023 (the “23.7” event). This recent event, surpassed only by the August 1963 deluge in Henan province, precipitated extensive disasters across the Beijing-Tianjin-Hebei region (BTH) over the North China Plain. Understanding the mechanisms underlying such extreme precipitation events, including moisture sources and atmospheric circulation patterns, in the context of synoptic-scale systems is crucial for accurate predictions and effective disaster mitigation in the future. To achieve this, this study utilized a vertically integrated water vapor transport method and a Water Accounting model to investigate the moisture sources and pathways of the “23.7” event. A systematic analysis of circulation patterns was also conducted based on the ERA5 reanalysis. The results showed that the western North Pacific and Indian Ocean contributed 38.1% and 18.6%, respectively, to the extreme rainfall over the BTH region. Additionally, terrestrial moisture sources contributed 16.59%, playing a significant role in the event. The stable and moisture-laden air was transported to the BTH due to the influence of binary tropical cyclones “Doksuri” and “Khanun,” as well as the western Pacific subtropical high-pressure system. Convergence and updraft dynamics trigger convective processes modulated by vortices and topography. The findings of this study help to build a deeper understanding of the formation processes and mechanisms behind such heavy rainfall, which provides insights for model predictions of similar high-impact low-frequency extreme rainfall events.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003956","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860346","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

An Improved Pattern Informatics Method for Extracting Ionospheric Disturbances Related to Seismicity Based on CSES Data: A Case Study of the Mw7.3 Maduo Earthquake 基于CSES数据的电离层扰动提取改进模式信息学方法——以Mw7.3玛多地震为例

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-06 DOI: 10.1029/2024EA003687

Weixi Tian, Yongxian Zhang, Changhui Ju, Shengfeng Zhang, Maoning Feng, Fengli Liu

{"title":"An Improved Pattern Informatics Method for Extracting Ionospheric Disturbances Related to Seismicity Based on CSES Data: A Case Study of the Mw7.3 Maduo Earthquake","authors":"Weixi Tian, Yongxian Zhang, Changhui Ju, Shengfeng Zhang, Maoning Feng, Fengli Liu","doi":"10.1029/2024EA003687","DOIUrl":"https://doi.org/10.1029/2024EA003687","url":null,"abstract":"The exploration of multi-layer coupling mechanisms between earthquakes and the ionosphere is crucial for utilizing ionospheric precursors in earthquake prediction. A significant research task involves continuously tracking the spatio-temporal changes in ionospheric parameters, acquiring comprehensive seismic anomaly information, and capturing “deterministic” precursor anomalies. Based on data from the China Seismo-Electromagnetic Satellite (CSES), we enhance the Pattern Informatics (PI) Method and propose an Improved Pattern Informatics (IPI) Method. The IPI method enables the calculation of the spatio-temporal dynamics of electron density anomalies detected by the CSES satellite. The seismic signals in the electron density during earthquake on 2021 at Maduo are investigated in this work. The results show that: (a) Compared to original electron density images, the IPI method-derived models extract distinct electron density anomaly signals, regardless of the data whether are collected during descending (daytime) or ascending (nighttime) orbits, or across different time scales of change window. (b) The electron density anomalies appear about 40 days prior to the Maduo Mw7.3 earthquake. The evolution of these anomalies follows a pattern of appearance, persistence, disappearance, re-emergence, and final disappearance. Moreover, the evolution trends of the IPI hotspot images at daytime and nighttime are similar. These results suggest that the IPI method can capture the spatio-temporal trends of ionospheric parameters and effectively extract electronic precursors related to strong earthquakes.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003687","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860410","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

Tropical Cyclone Wind Field Reconstruction for Hazard Estimation via Bayesian Hierarchical Modeling With Neural Network 基于神经网络贝叶斯分层建模的热带气旋风场重建

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-06 DOI: 10.1029/2024EA003678

C. Yang, J. Xu

{"title":"Tropical Cyclone Wind Field Reconstruction for Hazard Estimation via Bayesian Hierarchical Modeling With Neural Network","authors":"C. Yang, J. Xu","doi":"10.1029/2024EA003678","DOIUrl":"https://doi.org/10.1029/2024EA003678","url":null,"abstract":"Tropical cyclones (TCs) are one of the biggest threats to life and property around the world. Accurate estimation of TC wind hazard requires estimation of catastrophic TCs having a very long return period spanning up to thousands of years. Since reliable TC data are available only for recently decades, stochastic modeling and simulation turned out to be an effective approach to achieve more stable hazard estimates. In common practice, hundreds of thousands of synthetic TCs are generated first, then wind fields are reconstructed along synthetic TC tracks for hazard estimation. A Bayesian hierarchical modeling approach to the reconstruction of TC wind field is proposed. A modified Rankine vortex is adopted as the wind field model, of which the four free parameters are modeled simultaneously through a multi-output neural network as a latent process of the wind field. The four parameters are finally represented, spatially and temporally, by a set of neural network weights, The Bayesian model averaging technique is used for parameter estimation and wind field reconstruction, based on a ensemble of maximum a posteriori estimates of the set of weights. Together with previously proposed algorithm for synthetic TC simulation, a two-stage scheme for TC wind hazard estimation has been formed, which is based on best-track data only and thus is highly consistent. Application of this scheme to the offshore waters in the western North Pacific basin shows inspiring performance and great flexibility for various purposes of TC wind hazard estimation.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003678","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860270","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

Hollows on Mercury: A Comprehensive Analysis of Spatial Patterns and Their Relationship to Craters and Structures 水星上的空洞：空间模式的综合分析及其与陨石坑和结构的关系

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-05 DOI: 10.1029/2024EA003854

Barbara De Toffoli, Valentina Galluzzi, Matteo Massironi, Sebastien Besse, Gene Walter Schmidt, Oceane Barraud, Salvatore Buoninfante, Pasquale Palumbo

{"title":"Hollows on Mercury: A Comprehensive Analysis of Spatial Patterns and Their Relationship to Craters and Structures","authors":"Barbara De Toffoli, Valentina Galluzzi, Matteo Massironi, Sebastien Besse, Gene Walter Schmidt, Oceane Barraud, Salvatore Buoninfante, Pasquale Palumbo","doi":"10.1029/2024EA003854","DOIUrl":"https://doi.org/10.1029/2024EA003854","url":null,"abstract":"Hollows on Mercury are small (hundreds of meters - few kilometers), shallow (tens of meters), irregular depressions typically found in clusters, often associated with impact craters, and likely formed by the loss of volatile materials. While their exact formation process remains debated, various hypotheses suggest sublimation or space weathering. In this study, we analyzed the global distribution of hollows, exploring their spatial patterns and relationships with key geological features. Our findings challenge the idea that hollows arise from a single volatile-rich surface layer, suggesting instead that volatiles are dispersed throughout the crust. Hollows show no correlation with specific geological units or elevations, indicating no singular volatile source. Moreover, the transitory nature of hollows is suggested as they are rare in older, degraded craters but common in younger ones or older craters with deep-seated features, hinting at a link to the reworking of materials through impacts or volcano-tectonic activity.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003854","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764168","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

Long Period Ionospheric Disturbances Induced by Atmospheric Pressure Waves From the 2022 Tonga Volcanic Eruption 2022年汤加火山喷发气压波引起的长周期电离层扰动

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-05 DOI: 10.1029/2024EA003954

Dwijendra N. Pandey, Rajesh Rekapalli, J. K. Catherine, V. K. Gahalaut, N. Puviarasan

{"title":"Long Period Ionospheric Disturbances Induced by Atmospheric Pressure Waves From the 2022 Tonga Volcanic Eruption","authors":"Dwijendra N. Pandey, Rajesh Rekapalli, J. K. Catherine, V. K. Gahalaut, N. Puviarasan","doi":"10.1029/2024EA003954","DOIUrl":"https://doi.org/10.1029/2024EA003954","url":null,"abstract":"The Tonga-Hunga volcanic eruption on 15 January 2022 at 04:14:54 UTC produced large perturbations in the lower atmosphere and ionosphere globally. We report that the long period (0.28–16.67 mHz) ionospheric disturbances followed the surface pressure perturbations, which traveled globally. Here, we analyzed the Global Positioning System (GPS) data to understand the propagation of long period ionospheric disturbances together with the pressure waves in the regions along a great circle passing through Tonga, and also in the polar sectors. We also infer the strong westward propagation of ionospheric anomalies from GPS sites in Australia. This response of the ionosphere to the surface pressure fluctuations could be a possible reason for the observed ionospheric perturbations in polar regions. Our results demonstrate that (a) the pressure wave irregularities propagated all over the globe with an average velocity of ∼320 m/s and stimulated the non-dispersive ionospheric perturbations with the same velocity, (b) the volcano ionospheric disturbances due to multiple eruptions lasted for more than 3 hr and are even noticed in the northern and southern polar regions, (c) the variation of amplitude of the ionospheric perturbations with distance from Tonga follows an exponential decay with some irregularities near the equator, and (d) a low-frequency surface pressure irregularity of 12 hr duration is observed nearly 36 hr before the main eruption.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA003954","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764169","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

An Evaluation of Antarctic Ice Core Nitrate Records as a Proxy for Solar Activity 南极冰芯硝酸盐记录作为太阳活动代用物的评价

IF 2.9 3区地球科学

Earth and Space Science Pub Date : 2024-12-04 DOI: 10.1029/2023EA003221

C. M. Laluraj, Rahaman Waliur, Thamban Meloth

{"title":"An Evaluation of Antarctic Ice Core Nitrate Records as a Proxy for Solar Activity","authors":"C. M. Laluraj, Rahaman Waliur, Thamban Meloth","doi":"10.1029/2023EA003221","DOIUrl":"https://doi.org/10.1029/2023EA003221","url":null,"abstract":"Nitrate (NO3−) deposition in polar ice sheets archives valuable information on past solar activity. However, interpretation of Antarctic ice core NO3− records as a proxy for past solar activity remains challenging due to multiple sources and processes controlling NO3− variability in ice core records. Here, we present a new high-resolution ice core NO3− record (1905–2005 CE) from coastal Dronning Maud Land, East Antarctica, to investigate the solar signal and other forcing factors/processes in controlling ice core NO3− variability. Our record exhibits significant periodicity in the range of 8–12 years frequency band during 1940–2005 CE, apparently identified as the signal of ∼11 year sunspot cycle; however, such signal was not detected in the previous interval during 1905–1940 CE. To address the discontinuous and/or obscured signals in the present ice core record and inconsistency among various Antarctica ice core records, we extended our investigations to 10 ice core NO3− records from various regions of Antarctica. Analysis of seven records for the common interval from 1738 to 1990 CE reveals dominant periodicities of 8–12 years, indicating solar forcing as a primary driver, followed by precipitation modulated by El Niño-Southern Oscillation and Pacific Decadal Oscillation. Further, our investigation reveals that the solar signal extracted from multiple records becomes undetectable when mean annual hemispheric sunspot numbers larger than 140, suggesting this is a threshold limit for detecting the solar signal. These findings will improve our present understanding of ice core NO3− records as a proxy for past solar activity.","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"11 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023EA003221","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764096","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