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Mesospheric tide comparisons at low latitudes observed by two collocated meteor radars

Earth and Planetary Physics 2025年第1期9卷 54-68页

作者： Jian Li Wen Yi XiangHui Xue Jie Zeng hailun ye JianYuan Wang JinSong Chen Na Li TingDi Chen Chinese Academy of Sciences(CAS)Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Anhui Mengcheng Geophysics National Observation and Research StationUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave PropagationQingdao 266107China Yunnan Kunming Electromagnetic Environment National Observation and Research Station Qujing Kunming 655000China

Accurate knowledge of mesospheric winds and waves is essential for studying the dynamics and climate in the mesosphere and lower thermosphere(MLT)*** this study,we conduct a comparative analysis of the mesosphere tidal results obtained from two adjacent meteor radars at low latitudes in Kunming,China,from November 2013 to December *** two radars operate at different frequencies of 37.5 MHz and 53.1 MHz,***,overall good agreement is observed between the two radars in terms of horizontal winds and tide *** results show that the dominant tidal waves of the zonal and meridional winds are diurnal and semidiurnal ***,we conduct an exhaustive statistical analysis to compare the tidal amplitudes and vertical wavelengths recorded by the dual radar systems,which reveals a high degree of alignment in tidal *** investigation includes variances and covariances of tidal amplitudes,which demonstrate remarkable consistency across measurements from both *** finding highlights clear uniformity in the mesospheric tidal patterns observed at low latitudes by the two neighboring meteor *** of the comparative analysis specifically underscore the significant correlation in vertical wavelength measurements,validating the robustness of radar observations for tidal research.

关键词： mesosphere and lower thermosphere region meteor radar mesospheric winds tides

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Comparative analysis of empirical and deep learning models for ionospheric sporadic E layer prediction

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Earth and Planetary Physics 2025年第1期9卷 10-19页

作者： BingKun Yu PengHao Tian XiangHui Xue Christopher JScott hailun ye JianFei Wu Wen Yi TingDi Chen XianKang Dou Institute of Deep Space Sciences Deep Space Exploration LaboratoryHefei 230088China CAS Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Department of Meteorology University of ReadingReading RG66BBUK

Sporadic E(Es)layers in the ionosphere are characterized by intense plasma irregularities in the E region at altitudes of 90-130 *** they can significantly influence radio communications and navigation systems,accurate forecasting of Es layers is crucial for ensuring the precision and dependability of navigation satellite *** this study,we present Es predictions made by an empirical model and by a deep learning model,and analyze their differences comprehensively by comparing the model predictions to satellite RO measurements and ground-based ionosonde *** deep learning model exhibited significantly better performance,as indicated by its high coefficient of correlation(r=0.87)with RO observations and predictions,than did the empirical model(r=0.53).This study highlights the importance of integrating artificial intelligence technology into ionosphere modelling generally,and into predicting Es layer occurrences and characteristics,in particular.

关键词： ionospheric sporadic E layer radio occultation ionosondes numerical model deep learning model artificial intelligence

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Mesopause temperatures and relative densities at midlatitudes observed by the Mengcheng meteor radar

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Earth and Planetary Physics 2023年第6期7卷 665-674页

作者： Wen Yi XiangHui Xue MaoLin Lu Jie Zeng hailun ye JianFei Wu Chong Wang TingDi Chen Chinese Academy of Sciences Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for the Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China

The atmospheric temperatures and densities in the mesosphere and lower thermosphere(MLT)region are essential for studying the dynamics and climate of the middle and upper *** this study,we present more than 9 years of mesopause temperatures and relative densities estimated by using ambipolar diffusion coefficient measurements observed by the Mengcheng meteor radar(33.4°N,116.5°E).The intercomparison between the meteor radar and Thermosphere Ionosphere Mesosphere Energetics and Dynamics/Sounding of the Atmosphere by Broadband Emission Radiometry(TIMED/SABER)and Earth Observing System(EOS)Aura/Microwave Limb Sounder(MLS)observations indicates that the meteor radar temperatures and densities agree well with the simultaneous satellite *** variations dominate the mesopause temperatures,with the maximum during winter and the minimum during *** mesopause relative densities also show annual variations,with strong maxima near the spring equinox and weak maxima before the winter solstice,and with a minimum during *** addition,the mesopause density exhibits a structure similar to that of the zonal wind:as the zonal wind flows eastward(westward),the mesopause density decreases(increases).At the same time,the meridional wind shows a structure similar to that of the mesopause temperature:as the meridional wind shows northward(southward)enhancements,the mesopause temperature increases(decreases).Simultaneous horizontal wind,temperature,and density observations provide multiple mesospheric parameters for investigating mesospheric dynamics and thermodynamic processes and have the potential to improve widely used empirical atmospheric models.

关键词： meteor radar mesopause horizontal wind temperature density

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A comparison of MLT wind between meteor radar chain data and SDWACCM results

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Earth and Planetary Physics 2022年第5期6卷 451-464页

作者： BaoZhu Zhou XiangHui Xue Wen Yi hailun ye Jie Zeng JinSong Chen JianFei Wu TingDi Chen XianKang Dou CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for the Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave PropagationQingdao 266107China Electronic Information School Wuhan UniversityWuhan 430072China

A meteor radar chain located along the 120°E meridian in the Northern Hemisphere from low to middle latitudes provides longterm horizontal wind observations of the mesosphere and lower thermosphere(MLT)*** this study,we report a seasonal variation and its latitudinal feature in the horizontal mean wind in the MLT region observed by six meteor radar instruments located at Mohe(53.5°N,122.3°E),Beijing(40.3°N,116.2°E),Mengcheng(33.4°N,116.5°E),Wuhan(30.6°N,114.4°E),Kunming(25.6°N,108.3°E),and Fuke(19.5°N,109.1°E)*** addition,we compare the wind in the MLT region measured by the meteor radar stations with those simulated by the Whole Atmosphere Community Climate Model(WACCM).In general,the WACCM appears to capture well the seasonal and latitudinal variations in the zonal wind *** particular,the temporal evolution of the eastward zonal wind maximum shifts from July to May as the latitude ***,the simulated WACCM meridional wind exhibits differences from the meteor radar observations.

关键词： meteor radar chain MLT horizontal wind tide SD-WACCM

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不同接触方式的导线短路熔痕金相晶粒尺寸分析

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科技通报 2017年第6期33卷 6-9页

作者：叶海伦詹涌鑫李钊梁栋中山大学工学院广州510006 广东省消防科学技术重点实验室广州510006

当前所进行模拟短路实验,往往只是将实验的导线随意搭接,并没有考虑到实际短路时,导线存在各种类型的触碰,而不同类型的触碰往往导致不同的接触电阻,从而影响接触电弧的变化。本文将实际短路中导线的常见触碰方式进行归纳分类,形成点接... 详细信息

当前所进行模拟短路实验,往往只是将实验的导线随意搭接,并没有考虑到实际短路时,导线存在各种类型的触碰,而不同类型的触碰往往导致不同的接触电阻,从而影响接触电弧的变化。本文将实际短路中导线的常见触碰方式进行归纳分类,形成点接触、线接触、面接触三种抽象实验模型,并进行一次短路模拟实验,得到对应不同电流下的熔珠金相图谱,并利用IPP软件处理并测量晶粒尺寸进行分析。实验结果表明:熔痕金相晶粒尺寸明显体现出面接触>线接触>点接触、阳极>阴极的特点;随着初始短路电流增大,各种熔痕金相晶粒的平均长轴长度普遍表现出抛物线型的变化趋势,平均短轴长度规律性较差;阳极熔痕金相晶粒平均长短轴比均表现出抛物线型的变化趋势,且大体上体现面接触>线接触>点接触的特点。

关键词：模拟短路实验接触方式晶粒尺寸无量纲数

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PA6/BN/MgO导热复合材料的制备与性能研究

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中国塑料 2014年第11期28卷 37-41页

作者：唐昌伟叶海伦傅轶吴丽珍彭志宏李小辉李庆蛟广东银禧科技股份有限公司广东东莞523187 华南理工大学材料科学与工程学院广东广州510640

以聚酰胺6(PA6)为基体,以氮化硼(BN)、氧化镁(MgO)为导热填料制备了PA6/BN/MgO导热复合材料。固定填料含量为50%(质量分数,下同)不变,考察MgO/BN配比的变化对复合材料热导率、力学性能和熔体流动性的影响。结果表明,材料的热导率、拉伸... 详细信息

以聚酰胺6(PA6)为基体,以氮化硼(BN)、氧化镁(MgO)为导热填料制备了PA6/BN/MgO导热复合材料。固定填料含量为50%(质量分数,下同)不变,考察MgO/BN配比的变化对复合材料热导率、力学性能和熔体流动性的影响。结果表明,材料的热导率、拉伸强度和弯曲强度随着MgO/BN配比的增大而减小,冲击强度和断裂伸长率随着MgO/BN配比的增大而增大,材料熔体流动性则呈现了随MgO/BN配比的增大先增大后减小的趋势。

关键词：聚酰胺氮化硼氧化镁导热性

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中国科大蒙城流星雷达观测中间层-低热层大气风场和潮汐研究

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中国科学技术大学学报 2023年第5期53卷 1-12,I0001,I0008页

作者：易稳薛向辉曾洁王鉴远周宝柱叶海伦陈廷娣窦贤康中国科学技术大学地球和空间科学学院中科院近地空间环境重点实验室安徽合肥230026 中国科学技术大学蒙城地球物理国家野外科学观测研究站安徽合肥230026 中科院比较行星学卓越创新中心安徽合肥230026 深空探测实验室安徽合肥230026 航天科技协同创新中心安徽合肥230026

中国科学技术大学蒙城流星雷达(33.4°N,116.5°E)自2014年4月运行以来,已经持续观测超过了8 a。本文报道了该流星雷达8 a的水平风场和大气潮汐波动观测结果。另外,给出了该流星雷达观测和Navy Global Environmental Model-High Altitud... 详细信息

中国科学技术大学蒙城流星雷达(33.4°N,116.5°E)自2014年4月运行以来,已经持续观测超过了8 a。本文报道了该流星雷达8 a的水平风场和大气潮汐波动观测结果。另外,给出了该流星雷达观测和Navy Global Environmental Model-High Altitude(NAVGEM-HA)模拟的对比结果。观测结果表明在北半球较低中纬度地区,流星雷达观测的流星数量存在明显的周日变化,流星数量在当地时间的上午增多,在午后和夜晚降低。同时流星数量也存在明显的周年变化,在9和10月份出现大值,在2月份出现低值。此外,北半球较低中纬度地区中间层-低热层大气水平风场存在明显的周年变化,在84 km以上,纬向水平风场在夏季表现为东向风场,冬季表现为西向风场;而在84 km以下,冬季为东向风场,春季为西向风场。经向风场则表现出冬季为北向风场,夏季为南向风场。此外,大气风场存在明显的太阳热力潮汐波动,主要表现为周日潮汐,半日潮汐次之。其中纬向和经向周日潮汐均在春季3月份出现了最大值,振幅分别可达到40和30 m/s,而在秋季9月份出现较大值,振幅分别可达到30和25 m/s。周日潮汐振幅基本表现为在春秋分日附近出现增强,在冬夏至日附近出现减弱的特征。半日潮汐主要在90 km高度以上出现明显增强,而在季节变化特征上,在春季(4月)和秋季(9月)出现明显的增强。

关键词：中间层-低热层区域流星雷达中间层顶水平风场大气潮汐

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基于中国中东部多站流星雷达的二维风场观测研究

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地球与行星物理论评（中英文） 2024年第3期55卷 329-343页

作者：鲁茂林易稳曾洁薛向辉叶海伦陈廷娣中国科学技术大学、地球和空间科学学院、中国科学院近地空间环境重点实验室合肥230026 中国科学技术大学、地球和空间科学学院、安徽蒙城地球物理国家野外科学观测研究站合肥230026 合肥微尺度物质科学国家研究中心合肥230026 中国科学院比较行星学卓越创新中心合肥230026 航天科技协同创新中心哈尔滨150001

全天空流星雷达广泛应用于中间层-低热层大气水平风场的观测,为研究该区域大气风场的变化特征提供了重要数据支持.目前流星雷达主要采用单站观测模式,没有水平分辨率,并且只能探测流星区域的大气平均水平风场.为了得到更加丰富且精准的... 详细信息

全天空流星雷达广泛应用于中间层-低热层大气水平风场的观测,为研究该区域大气风场的变化特征提供了重要数据支持.目前流星雷达主要采用单站观测模式,没有水平分辨率,并且只能探测流星区域的大气平均水平风场.为了得到更加丰富且精准的中间层-低热层大气风场信息,本研究介绍了建设在中国安徽地区的多站流星雷达系统,该系统包括安装在蒙城(33.36°N,116.49°E)的一台单站流星雷达和长丰(31.98°N,117.22°E)的一台远程接收机,两地直线距离约为167 km.相比于单站流星雷达,多站流星雷达系统探测到的前向散射流星数目增加了约70%,并且一般可以提供400 km×400 km以上的水平观测区域.除此之外,多站流星雷达系统还可以提供更加丰富的流星观测角度.新多站系统可以实现中间层-低热层大气二维水平风场的观测,在获取平均水平风场以及风场水平梯度的同时,还可以估计水平风场的散度、相对涡度和拉伸、剪切形变信息.多站流星雷达能够提供更多的水平风场参数,对进一步研究中间层-低热层区域的大气动力学过程具有重要意义.不仅如此,未来即将建成的多站流星雷达观测网将会实现中国中东部地区上空的中间层-低热层大气高时空分辨率的三维风场观测,这将有利于促进我们对中间层-低热层区域内的各类波动过程的理解.

关键词：流星雷达中间层-低热层大气大气水平风场

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Tower-based observation of air-sea momentum flux:comparisons between onshore and offshore winds

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Acta Oceanologica Sinica 2020年第7期39卷 61-68页

作者： Maosheng ye Shuang Li Zhongshui Zou Jinbao Song hailun He Jian Huang Hongwei Yang Ocean College Zhejiang UniversityZhoushan 316021China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Guangzhou Institute of Tropical and Marine Meteorology China Meteorological AdministrationGuangzhou 510640China College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China

We investigate the air-sea momentum flux in the marine atmospheric boundary layer using a tower-based direct measurement ***,we compare the collected data with previous observations,and the results are roughly ***,in the low-to-moderate winds,the exchange coefficients(or drag coefficients)deviate between onshore and offshore winds,which exhibits the influence of surface wave on the momentum ***,we use a surface-wave-involved parameterization scheme to explain the dependence of momentum flux on surface *** results consolidate the influence of surface wave on momentum flux on the one hand,and validate the surface-wave-involved parameterization scheme on the other hand.

关键词： air-sea momentum flux direct measurement method marine atmospheric boundary layer

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Multi-omics characterization and therapeutic liability of ferroptosis in melanoma

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Signal Transduction and Targeted Therapy 2022年第9期7卷 3194-3197页

作者： Yi He Yu Dong Yong Chen Guanxiong Zhang hailun Zhang Guang Lei Yanhua Du Xiang Chen Youqiong ye Hong Liu Department of Dermatology Hunan Key Laboratory of Skin Cancer and PsoriasisHunan Engineering Research Center of Skin Health and DiseaseXiangya Clinical Research Center for Cancer ImmunotherapyXiangya HospitalCentral South UniversityChangshaChina Shanghai Institute of Immunology Department of Immunology and MicrobiologyShanghai Jiao Tong University School of MedicineShanghaiChina Department of Musculoskeletal Surgery Fudan University Shanghai Cancer CenterShanghaiPR China Department of Oncology Shanghai Medical CollegeFudan UniversityShanghaiPR China Department of Research and Development Beijing GAP Biotechnology Co.LtdBejingChina Department of Radiation Oncology Hunan Cancer Hospital and The Affliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangshaChina

Dear Editor,Ferroptosis,an iron-dependent form of programmed cell deathdriven by excessive lipid peroxidation,1has emerged as,apromising andeffective strategy fortrigering cancer celldeath.2,3Insufficient understanding of the role of ferroptosis in melanomaprogression and the tumor microenvironment(TME)has limitedthe development of ferroptosis-targeted therapy and combina-tions with other therapeutic strategies.

关键词： therapeutic melanoma peroxidation

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