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Spectral analysis of quasi-stationary sea surface topography from GRACE mission

Science china Earth {1. 2005年第11期48卷 2040-2048页

作者： zhang zizhan1,{1.,3 1. institute of geodesy and Geophysics, chinese academy of sciences, wuhan 4.0077, china 2. Graduate School of the chinese academy of sciences, Beijing 1.0039, china 3. Unite Center for Astro-geodymics Research, chinese academy of sciences, Shanghai 2.0030, china 1. institute of {1. and Geophysics Chinese Academy of Sciences 430077 Wuhan China 2. Graduate School of the chinese academy of sciences 100039 Beijing China 3. Unite Center for Astro-geodymics Research Chinese Academy of Sciences 200030 Shanghai China

During the last two decades satellite altimetry has offered an abundance of meas-urements of the sea surface resulting in the improvement of global mean sea surface height (MSSH) and marine geoid determination. On the other hand, with the launching of new genera-tion gravity satellites, some high accuracy long-wavelength gravity models are available. These breakthroughs give us a great opportunity for new estimation of quasi-stationary sea surface topography (QSST). In this paper, the new gravity model GGM01. derived from GRACE mission is briefly presented, and a new global high precision and high-resolution QSST is determined based on the GGM01. model and the global MSSH. The spectral features of the QSST esti-mated by GGM01. and EGM96 gravity model to degree/order 2.0 are discussed by spectral analysis. As a result, the QSST is mainly composed of long waves, medium waves partially and short waves scarcely, its power spectral structures are different between the zonal direction and the meridional direction, there are great differences between the two models, which maybe ex-plain why the ocean currents derived from the two gravity models by Tapley show different pat-terns.

关键词： quasi-stationary sea surface topography, mean sea surface height, GGM01. fast Fourier transform, spectral analysis

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Spatial and temporal patterns of the inter-annual oscillations of glacier mass over Central Asia inferred from Gravity Recovery and Climate Experiment(GRACE) data

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Journal of Arid Land 2017年第1期9卷 87-97页

作者： ZHU Chuandong lu {1. SHI Hongling {2. zizhan State Key Laboratory of geodesy and Earth's Dynamics Chinese Academy of Sciences Wuhan 430077 China University of chinese academy of sciences Beijing 100049 China Center for Space Research University of Texas at Austin Austin 78759 USA

Monitoring glacier mass balance is crucial to managing water resources and also to understanding climate change for the arid and semi-arid regions of Central Asia. This study extracted the inter-annual oscillations of glacier mass over Central Asia from the first ten principal components（S-PCs） of filtered variability via multichannel singular spectral analysis（MSSA）, based on gridded data of glacier mass inferred from Gravity Recovery and Climate Experiment（GRACE） data obtained from July 2.02.to March 2.1.. Two significant cycles of glacier mass balance oscillations were identified. The first cycle with a period of 6.1.year accounted for 54.5% of the total variance and the second with a period of 2.3-year accounted for 4.3%. The 6.1.year oscillation exhibited a stronger variability compared with the 2.3-year oscillation. For the 6.1.year oscillation, the results from lagged cross-correlation function suggested that there were significant correlations between glacier mass balances and precipitation variations with the precipitation variations leading the response of glacier mass balances by 9–1. months.

关键词： Gravity Recovery and Climate Experiment glacier mass balance multichannel singular spectral analysis Central Asia

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Characterizing three-dimensional features of Antarctic subglacial lakes from the inversion of hydraulic potential——Lake Vostok as a case study

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Advances in Polar Science 2019年第1期30卷 70-75页

作者： LI Yan lu {1. {2. zizhan SHI Hongling XI Hui State Key Laboratory of geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences University of chinese academy of sciences

To estimate basal water storage beneath the Antarctic ice sheet, it is essential to have data on the three-dimensional characteristics of subglacial lakes. We present a method to estimate the water depth and surface area of Antarctic subglacial lakes from the inversion of hydraulic potential method. Lake Vostok is chosen as a case study because of the diverse and comprehensive measurements that have been obtained over and around the lake. The average depth of Lake Vostok is around 345±4 m. We estimated the surface area of Lake Vostok beneath the ice sheet to be about 1.300±594 km^2. The lake consists of two sub-basins separated by a ridge at water depths of about 2.0–300 m. The surface area of the northern sub-basin is estimated to be about half of that of the southern basin. The maximum depths of the northern and southern sub-basins are estimated to be about 450 and 850 m, respectively. Total water volume is estimated to be about 4658±2.4 km^3. These estimates are compared with previous estimates obtained from seismic data and inversion of aerogravity data. In general, our estimates are closer to those obtained from the inversion of aerogravity data than those from seismic data, indicating the applicability of our method to the estimation of water depths of other subglacial lakes.

关键词： three-dimensional features Lake Vostok hydraulic potential subglacial water storage

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不同类型地震震级与重力变化异常的统计特征及其机理分析

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地球物理学报 2024年第8期67卷 3032-3059页

作者：李树鹏胡敏章祝意青朱成林崔华伟陆汉鹏张刚王锋吉山东省地震局济南250014 中国地震局地震研究所地震大地测量重点实验室武汉430071 武汉引力与固体潮国家野外科学观测研究站武汉430071 中国地震局第二监测中心西安710054

依据收集到的1.7个4.0级以上地震震例,研究中国陆区中强地震震前重力变化异常统计特征,探讨地震震级与震前重力变化异常各要素及地震性质之间的统计关系,给出了5、6、7、8级地震震级判定的重力变化异常时变距S、量级G和时间T参考指标,... 详细信息

依据收集到的1.7个4.0级以上地震震例,研究中国陆区中强地震震前重力变化异常统计特征,探讨地震震级与震前重力变化异常各要素及地震性质之间的统计关系,给出了5、6、7、8级地震震级判定的重力变化异常时变距S、量级G和时间T参考指标,并对比、分析了逆冲型、走滑型和正断型地震的重力变化特点,进而结合流体物质运移假说及岩石物理实验结果,探讨了震前重力变化异常的物理机制,以及其与亚失稳阶段、地震孕育能量的联系.得到的主要结论有:(1.震前重力变化异常参量与震级之间更符合非线性关系,5、6、7、8级地震的震前重力变化异常时变距参考指标分别为67、1.1.1.5、305 km,重力变化异常量级参考指标分别为49、67、92.1.5μGal,重力变化异常时间参考指标分别为1.6、2.5、3.7、5.2.a.(2.地震类型对震前重力变化参量有一定影响,尤其是7级以上强震的差异更加明显,逆冲型地震的重力变化量级及时变距可能更大;重力变化异常时间方面,正断型地震可能对应更长的重力变化时间,逆冲型次之,走滑型最短.(3)震前重力变化异常的物理机制可能是,在孕震晚期、亚失稳阶段,震中周边区域岩石裂隙增多、扩展、贯通,引起流变性的深部幔源物质向地壳运移,同时地壳内先存的流体物质由于应力分布不均而大规模迁移,最终在地表引起重力场变化响应.(4)目前流动重力观测受到时空密度的制约,地震预报主要针对5级以上地震,且震级越大预报效能越好.

关键词：地震预报重力变化异常震级震源机制解

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基于GRACE RL06数据监测和分析南极冰盖2.个流域质量变化

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地球物理学报 2019年第3期62卷 864-882页

作者：高春春陆洋史红岭张子占徐长仪谭冰南阳师范学院河南南阳473061 "中央"研究院地球科学研究所中国台北11529 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室武汉430077 中国科学院大学北京100049 中国地震局地震预测研究所北京100036

本文基于CSR最新公布的GRACE RL06版本数据,采用Slepian空域反演法估算了南极冰盖2.个流域的质量变化.Slepian空域反演法结合了Slepian空间谱集中法和空域反演法的技术优势,能够有效降低GRACE在小区域反演时信号出现的严重泄漏和衰减,... 详细信息

本文基于CSR最新公布的GRACE RL06版本数据,采用Slepian空域反演法估算了南极冰盖2.个流域的质量变化.Slepian空域反演法结合了Slepian空间谱集中法和空域反演法的技术优势,能够有效降低GRACE在小区域反演时信号出现的严重泄漏和衰减,进而精确获得南极冰盖在每个流域的质量变化.相对于GRACE RL05版本数据,RL06在条带误差的控制上要更加优化,获得的南极冰盖质量变化时间序列也更加平滑,但在趋势估算上差别并不明显(小于1.Gt/a).本文的估算结果显示:在2.02.4月至2.1.年8月期间,整个南极冰盖质量变化速率为-1.8.6±1..3Gt/a,其中西南极为-1.2.4±1..5Gt/a,南极半岛为-2..2.2.1.t/a,东南极则为52.9±8.6Gt/a.南极冰盖损失最大的区域集中在西南极Amundsen Sea Embayment(流域2.-2.),该地区质量变化速率为-2.3.5±4.1.t/a,其次为南极半岛(流域2.-2.)以及东南极Victoria-Wilkes Land (流域1.-1.),质量变化速率分别为-2..2.2.1.t/a和-1..0±4.7Gt/a,其中Amundsen Sea Embayment和南极半岛南部两个地区的冰排放呈现加速状态.南极冰盖质量显著增加的区域主要有西南极的Ellsworth Land(流域1.和Siple Coast(流域1.和1.)以及东南极的Coats-Queen Maud-Enderby Land (流域3-8),三个地区质量变化速率分别为1..2.2.4Gt/a、43.9±1.9Gt/a和62.7±3.8Gt/a,质量增加大多来自降雪累积,比如:Coats-Queen Maud-Enderby Land在2.09年和2.1.年发生的大规模降雪事件,但也有来自冰川的增厚,如:Siple Coast地区Kamb冰流的持续加厚.此外,对GRACE估算的南极冰盖质量变化年际信号进行初步分析发现,GRACE年际信号与气候模型估算的冰盖表面质量平衡年际信号存在显著的线性相关关系,但与主要影响南极气候年际变化的气候事件之间却不存在线性相关关系,这说明南极冰盖质量变化的年际信号主要受冰盖表面质量平衡的支配,而气候事件对冰盖表面质量平衡的影响可能是复杂的非线性耦合过程.

关键词：南极冰盖质量平衡 GRACE 流域年际变化

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Taking the pulse of COVID-1.:a spatiotemporal perspective

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International Journal of Digital Earth 2020年第10期13卷 1186-1211页

作者： Chaowei yang Dexuan Sha Qian Liu Yun Li Hai Lan Weihe Wendy Guan Tao Hu Zhenlong Li Zhiran {1. John Hoot Thompson Zifu Wang David Wong Shiyang Ruan Manzhu Yu Douglas Richardson luyao {1. Ruizhi Hou You Zhoua Cheng Zhong Yifei Tian Fayez Beaini Kyla Carte Colin Flynn Wei Liu Dieter Pfoser Shuming Bao Mei Li Haoyuan {1. Chunbo Liu Jie Jiang Shihong Du Liang Zhao Mingyue lu Lin Li Huan Zhou Andrew Ding NSF Spatiotemporal Innovation Center George Mason Univ.FairfaxVAUSA Department of Geography and GeoInformation Science George Mason Univ.FairfaxVAUSA Department of Geographical sciences University of MarylandCollege ParkMDUSA Center for Geographic Analysis Harvard UniversityCambridgeMAUSA Geoinformation and Big Data Research Lab Department of GeographyUniversity of South CarolinaColumbiaSCUSA chinese {1. of Surveying and Mapping BeijingPeople’s Republic of China School of Resource and Environmental sciences Wuhan UniversityWuhanPeople’s Republic of China Cloud Computeand Storage OperationsInformation Technology ServicesGeorge Mason UniversityFairfaxVAUSA Department of Geography Pennsylvania State UniversityState CollegePAUSA School of Business Management East China Normal UniversityShanghaiPeople’s Republic of China School of Mathematical sciences East China Normal UniversityShanghaiPeople’s Republic of China Department of Psychology George Mason UniversityFairfaxVAUSA mDepartment of Computer Science George Mason UniversityFairfaxVAUSA Department of Information Technology George Mason UniversityFairfaxVAUSA Department of Biology George Mason UniversityFairfaxVAUSA College of Land Science and Technology China Agricultural UniversityBeijingPeople’s Republic of China china Data {1. Ann ArborMIUSA institute of Remote Sensing and GIS Peking UniversityBeijingPeople’s Republic of China Aerospace Information Research institute Chinese Academy of SciencesBeijingPeople’s Republic of China School of Geomatics and Urban Spatial Informatics Beijing University of Civil Engineering and ArchitectureBeijingPeople’s Republic of China School of Geographical sciences Nanjing University of Information Science&TechnologyNanjingPeople’s Republic of China School of geodesy and Geomatics Wuhan UniversityWuhanPeople’s Republic of China wFaculty of Environment University of WaterlooWaterlooCanada

The sudden outbreak of the Coronavirus disease(COVID-1.)swept across the world in early 2.2.,triggering the lockdowns of several billion people across many countries,including{1.,Spain,India,the U.K.,Italy,France,Germany,Brazil,Russia,and the *** transmission of the virus accelerated rapidly with the most confirmed cases in the U.S.,India,Russia,and *** response to this national and global emergency,the NSF Spatiotemporal Innovation Center brought together a taskforce of international researchers and assembled implementation strategies to rapidly respond to this crisis,for supporting research,saving lives,and protecting the health of global *** perspective paper presents our collective view on the global health emergency and our effort in collecting,analyzing,and sharing relevant data on global policy and government responses,human mobility,environmental impact,socioeconomical impact;in developing research capabilities and mitigation measures with global scientists,promoting collaborative research on outbreak dynamics,and reflecting on the dynamic responses from human societies.

关键词： Big Data Earth system emergency geospatial sciences epidemics applications

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Global plate motion and earthquake activity

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geodesy and Geodynamics 2010年第1期1卷 1-7页

作者： Yanxing Li Xiwu luan Yuanzhong lu Jinghua {2. Hong Liu Sanming luo Feng Liu First Crust Monitoring and Application Center China Earthquake Administration Tianfin 300180 China institute of Oceanology Chinese Academy of Sciences Qingdao 266003 China institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

The global plate motion rates Ω are not uniform in time and space. The rotation rates were larger than 0. 545°/Ma for Cocos, Philippine Sea, Pacific, Nazca, Australia, India and Arabia plates, but smaller than 0. 31.°/Ma. for other plates. Compared to 1.97. 0, the Ω va{2.es of the three oceanic plates in 2.00. 0 increased by,respectively,2.4% ,2. 1. and 41.7%, and the northward movement rates of the the India plate and western part of the Australia plate increased by 3.38 mm/a on the average. The spatial distribution of earthquakes was dependent on earthquake magnitude. Earthquakes of 5.0 ≤ Mw 〈 7.0 were located mainly in plate-margin zones and intra-plate crustal deformation zones joining the southern margin of Eurasia plate. Earthquakes of Mw≥7.0 concentrated basically in the circum-Pacific and South Asia zones, but hardly in midocean-ridge seismic zones. Earthquakes of Mw ≥ 8.0 were located only in the margin zones of the India, Aus- tralia,Pacific and Nazca plates orthogonal to the direction of plate motion. Compared with previous eighteen years, global earthquake activity enhanced obviously after 1.94, especially after 2.01. The Ω va{2.e of a plate was closely related to the activity of strong earthquakes. The largest earthquakes were located in the front-margin zones of plates having the largest Ω va{2.es. Energy released by strong earthquakes comes mainly from kinetic energy of the plates. Global seismicity enhancement was caused mainly by the acceleration of the three oceanic plates. Larger enhancement of global earthquake activity lagged behind the movement acceleration of the three oceanic plates by four years.

关键词： plate motion acceleration global seismicity enhancement GPS

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Analysis and selection of global marine gravity/gravity gradient aided navigation matching areas

Analysis and selection of global marine gravity/gravity grad...

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第九届中国卫星导航学术年会

作者： Lin Wu Hubiao Wang Hua Chai lu {1. Houtse Hsu Yong Wang State Key Laboratory of geodesy and Earth’s Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences University of chinese academy of sciences

With the development of underwater passive navigation in recent years,gravity or gravity gradient matching navigation are utilized to correct the accumulated navigation errors of inertial navigation *** accuracy and success rate of gravity/gravity gradient matching navigation are seriously affected by the features of gravity changes in the sailing *** this paper,a parameter named average gravity difference(AGD) was introduced here to express the level of gravity changes in a certain *** the overall survey of global marine gravity,the AGD values of local areas were calculated and *** a series of experiments,the relationship of AGD values and navigation accuracy in local areas can be generally *** the criterion of selection of matching areas was induced,marine gravity matching areas for navigation can be *** results showed that,take gravity as an example,the AGD values can range from about 0.6 to 2.7 m Gal/nautical mile(1.nautical mile = 1.n mile = 1.52.m) in different areas of the oceans around the *** present technologies,gravity matching navigation could achieve an accuracy of 0.5 n miles in matching areas which have AGD values larger than 2.0 m Gal/n *** this criterion,South china Sea,North Indian Ocean and some other areas can be *** these areas,better navigation results can be obtained since they have rougher gravity *** results would be significant for the development of gravity aided navigation technologies and the construction of underwater PNT system.

关键词： gravity aided navigation matching areas selection underwater navigation gravity matching gravity gradient

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基于MIKE2.0}灰色模式识别模型的洪湖水质模拟与评价

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长江流域资源与环境 2018年第9期27卷 2090-2100页

作者：张婷王学雷耿军军班璇杨超吕晓蓉湖北科技学院资源环境科学与工程学院湖北咸宁437100 中国科学院测量与地球物理研究所环境与灾害评估湖北省重点实验室湖北武汉430077 武汉大学资源与环境科学学院湖北武汉430072

认识自然和人为因素驱动下湖泊水环境质量的响应和变化规律,有利于更精确地进行湖泊水质模拟和评价。运用二维水质模型和灰色模式识别模型评价了不同污染源削减方案对洪湖水质的影响。基于2.1.年实测地形、水文、气象、水质和污染源定... 详细信息

认识自然和人为因素驱动下湖泊水环境质量的响应和变化规律,有利于更精确地进行湖泊水质模拟和评价。运用二维水质模型和灰色模式识别模型评价了不同污染源削减方案对洪湖水质的影响。基于2.1.年实测地形、水文、气象、水质和污染源定量输入,建立了洪湖二维水动力和水质耦合模型。模拟结果显示:水位率定和验证的均方根误差分别为0. 1.和0. 08 m,总氮、总磷、铵态氮和高锰酸盐指数的率定误差分别为0. 1.1.0. 009、0. 1.0和0. 62. mg/L,验证误差分别为0. 1.1.0. 02.、0. 079和0. 689 mg/L,水动力模型和水质模型的模拟结果满足精度要求。不同管理措施方案下洪湖水质的恢复效果比较显示,洪湖蓝田和下新河入水口各污染物指标浓度减少50%方案下,水质的恢复效果最好,全湖总氮、总磷、铵态氮和高锰酸盐指数均值减少率分别为37. 2.、35. 1.、37. 3%和2.0} 3%,全湖Ⅴ类水质水域基本不存在,全湖90%的区域水体水质综合等级达到Ⅲ类。影响洪湖水质恶化的驱动因子中,关键因素是径流入湖所携带的四湖流域上游地区的非点源污染物。应大力控制上游地区的非点源污染,积极开展洪湖东北部和西北部的湿地水生植被生态修复工程,恢复水体的截污和自净能力。

关键词：水质模拟 MIKE 2. 灰色模式识别模型水质评价洪湖

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2.1.年印尼帕卢M_W7.5地震——一次超剪切破裂事件

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地球物理学报 2019年第8期62卷 3017-3023页

作者：李琦谭凯赵斌鲁小飞张彩红王东振中国地震局地震研究所中国地震局地震大地测量重点实验室

利用反投影方法,使用日本密集台网Hi-net远场垂直分量568条P波资料对2.1.年9月2.日印尼帕卢MW7.5地震震源破裂过程进行成像,结果显示此次地震的能量释放比较集中,主要集中在1.~2.s之间.破裂有两个集中区,破裂峰值分别位于1.s和1.s,最大... 详细信息

利用反投影方法,使用日本密集台网Hi-net远场垂直分量568条P波资料对2.1.年9月2.日印尼帕卢MW7.5地震震源破裂过程进行成像,结果显示此次地震的能量释放比较集中,主要集中在1.~2.s之间.破裂有两个集中区,破裂峰值分别位于1.s和1.s,最大能量释放区域位于震中南侧约0~50km内,另一破裂集中区覆盖了帕卢市及周边区域.破裂主要向南侧延展,破裂总长度至少1.0km,平均破裂速度约4.1.m·s^-1.属于一次超剪切破裂事件.

关键词：印尼帕卢MW7.5地震震源破裂过程反投影超剪切破裂

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