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Influence of topography on the fine structures of stratospheric gravity waves:An analysis using COSMIC-2 temperature data

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Earth and Planetary Physics 2024年第3期8卷 497-513页

作者： JiaRui Wei Xiao Liu jiyao xu QinZeng Li Hong Gao State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Electromagnetic Wave School of PhysicsHenan Normal UniversityXinxiang Henan 453000China

We derive the potential energy of gravity waves(GWs)in the upper troposphere and stratosphere at 45°S-45°N from December 2019 to November 2022 by using temperature profiles retrieved from the Constellation Observing System for Meteorology,Ionosphere,and Climate-2(COSMIC-2)*** to the dense sampling of COSMIC-2,in addition to the strong peaks of gravity wave potential energy(GWPE)above the Andes and Tibetan Plateau,we found weak peaks above the Rocky,Atlas,Caucasus,and Tianshan *** land-sea contrast is responsible for the longitudinal variations of the GWPE in the lower and upper *** 40°N/S,the peaks were mainly above the topographic regions during the *** 20°N/S,the peaks were a slight distance away from the topographic regions and might be the combined effect of nontopographic GWs and mountain *** the Equator,the peaks were mainly above the regions with the lowest sea level altitude and may have resulted from *** results indicate that even above the local regions with lower sea level altitudes compared with the Andes and Tibetan Plateau,the GWPE also exhibits fine structures in geographic *** found that dissipation layers above the tropopause jet provide the body force to generate secondary waves in the upper stratosphere,especially during the winter months of each hemisphere and at latitudes of greater than 20°N/S.

关键词： topography fine structures stratospheric gravity waves Constellation Observing System for Meteorology Ionosphere and Climate-2(COSMIC-2) dissipation layers

Inversion of O_(2) 1.27 μm nightglow emissions: A climatological analysis using satellite Limb-Viewed spectra and Harmonic analysis method

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Earth and Planetary Physics 2024年第4期8卷 632-640页

作者： YiYi Sui YaJun Zhu QiuYu Chen MaoSheng He jiyao xu State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Key Laboratory of Solar Activity and Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Hainan National Field Science Observation and Research Observatory for Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China

This study employs a linear inversion algorithm to retrieve volume emission rates(VERs)of molecular O_(2) nightglow at 1.27μm,utilizing Limb-Viewed spectra obtained from the SCanning Imaging Absorption spectroMeter for Atmospheric for CHartographY(SCIAMACHY)payload on board the Envisat *** retrieved results are compared with VERs data from the SABER payload on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics(TIMED)satellite,exhibiting *** will help to facilitate accurate revelation of spatial distribution and periodic variation in O_(2) *** are extracted monthly within the altitude range of 75-110 km from 2002 to 2012,yielding a climatology of spatial and temporal *** meridional structure exhibits two maxima,at the equator and at 45°*** August and October,the VERs exhibit a meridional bimodal structure,with the weaker one above the equator and the stronger one above 45°*** April,the VERs reach their annual ***,harmonic analysis reveals significant temporal variations on different *** emission shows characteristics of annual and semi-annual variation,and a non-linear long-term trend associated with solar cycle activity.

关键词： VERs O_(2)1.27μm nightglow SCIAMACHY

Progress of International Meridian Circle Program

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空间科学学报 2024年第4期44卷 741-745页

作者： WANG Chi BLANC Michel ZHANG Shunrong DENARDINI Clezio Marcos LIU William SHEN xuhui WU Jian xu jiyao LI Hui ZHANG Qinghe REN Liwen ZHU Yajun LI Guozhu DING Zonghua LIU Zhengkuan YANG Fang National Space Science Center Chinese Academy of SciencesBeijing 100190 IRAP(CNRS-University Toulouse III-CNES) Toulouse 31400 Haystack Observatory Massachusetts Institute of TechnologyMA 01886 Instituto Nacional de Pesquisas Espaciais São Josédos Campos(SP)Brazil 12227-010 China Research Institute of Radio wave Propagation Qingdao 266000 Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100083

In 2024,the Chinese Meridian Project(CMP)completed its construction,deploying 282 instruments across 31 *** achievement not only provides a robust foundation but also serves as a reference template for the International Meridian Circle Program(IMCP).The IMCP aims to integrate and establish a comprehensive network of ground-based monitoring stations designed to track the propagation of space weather events from the Sun to ***,it monitors various disturbances generated within the Earth system that impact *** the past two years,significant progress has been made on the *** particular,the second phase of construction for the China-Brazil Joint Laboratory for Space Weather has been completed,and the North Pole and Southeast Asia networks are under active *** 2024 IMCP joint observation campaign was successfully *** facilitate these developments,the scientific program committee of IMCP was established,following the success of 2023 IMCP workshop and the space weather school,which was co-hosted with the Asia-Pacific Space Cooperation Organization(APSCO)and sponsored by Chinese Academy of Sciences(CAS)and Scientific Committee on Solar-Terrestrial Physics(SCOSTEP).Preparations are now underway for the 2024 workshop in collaboration with the National Institute for Space Research(INPE)in Brazil.

关键词： Chinese Meridian Project(CMP) International Meridian Circle Program(IMCP) China-Brazil Joint Laboratory for Space Weather North Pole and Southeast Asia networks

三维高清数字技术语境下中国水墨动画的创作路径与发展探索——以《秋实》为例

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艺术与设计（理论版） 2024年第1期 89-92页

作者：许绩尧北京电影学院北京100088

水墨动画是在动画艺术层面对中国水墨绘画进行的继承和发展,蕴含着中国历史悠久的传统艺术思想与和谐共生的美学观念。伴随着数字技术的飞速发展,越来越多的动画艺术工作者开始在数字技术与水墨动画相结合的创作实践道路上进行探索。二... 详细信息

水墨动画是在动画艺术层面对中国水墨绘画进行的继承和发展,蕴含着中国历史悠久的传统艺术思想与和谐共生的美学观念。伴随着数字技术的飞速发展,越来越多的动画艺术工作者开始在数字技术与水墨动画相结合的创作实践道路上进行探索。二者融合的前提是如何合理有效的保留传统水墨风格意蕴的基础上借助数字技术进行艺术创新。文章以《秋实》为例,对三维高清数字技术语境下水墨动画的传承与创新进行了分析与研究。水墨动画的成功不应凝固在过去,它作为一种中国标志性的动画艺术形式更要始终保持鲜活的流动性。

关键词：水墨动画数字技术传承创新

Simulation of response of sodium layer to the propagation of gravity wave

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Science China(Technological Sciences) 2004年第3期47卷 335-342页

作者： xu jiyao Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

A time-dependent two-dimensional photochemical-dynamical coupling gravity wave model of sodium layer is developed, which combines the sodium photochemical theory, a time-dependent two-dimensional atmospheric photochemical model, a two-dimensional gravity wave model, and the International Reference Ionosphere model (IRI-95)with the diabatic process induced by photochemical reactions and the transport of chemical species by gravity waves included. The pseudospectral method is used in the horizontal direction, the finite difference approximations are used in vertical direction z and time t. And FICE method is used to solve the model. The simulation results indicate that intense perturbations of the sodium layer can be induced by the propagation of gravity waves. The results are consistent with the observations.

关键词： gravity wave, photochemistry, nonlinear, numerical simulation, mesopause, sodium layer.

Nighttime anomaly of ionospheric electron density

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Science China Earth Sciences 2016年第7期59卷 1517-1518页

作者： xu jiyao LIU Xiao State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences School of Mathematics and Information Science Henan Normal University

The ionosphere is composed of a large number of electrons and ions, which are produced by the photoionization effect of the solar radiation on the neutral atmosphere. The altitude range of ionosphere is about 60–1000 km and varies with local time and other factors （e.g., solar and geomagnetic activity）. Although the ionosphere varies over multiply timescales, the diurnal variation is in the dominant position due to the sun’s photoionization effect.

关键词： anomaly altitude neutral multiply latitude winter seasonal diurnal magnitude hemisphere

Daytime lidar measurements of the sodium layer in China

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Science China Earth Sciences 2016年第8期59卷 1707-1708页

作者： LIU Xiao xu jiyao School of Mathematics and Information Science Henan Normal University State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences

Metal layers are formed owing to the deposition of metal species, such as, Na, Fe, Ma, Si, Ca, and K, in the mesosphere and lower thermosphere region. The metal species come from the meteor ablations when meteors enter into the atmosphere （Plane, 1991）. Among these species, Na can be easily detected by sodium lidar since it has enough abundance and large backward scattering cross-section. On the other hand, the chemical lifetime of the sodium layer is longer than one day in the main sodium layer （85-100 km） and thus can be employed as a dynamical tracer for atmospheric perturbations （xu et al., 2003）.

关键词： lidar backward lifetime enough abundance longer

Cause of winter gravity wave spectrum saturation

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Science China Earth Sciences 2005年第10期48卷 1802-1808页

作者： WU Yongfu xu jiyao Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

This paper utilizes horizontal velocity measurements observed from 19 chaff rockets and nearly simultaneous temperature measurements collected from 19 falling sphere rockets to study the cause of winter gravity wave spectrum saturation. Results suggest that strong hori-zontal velocity shears larger than 0.04 s?1 are observed to be present at various heights near the winter mesopause. On one single chaff rocket flight, an extremely strong horizontal velocity shear as high as 0.33 s?1 is observed at 87.4 km and is believed to be the strongest value ever meas-ured in the mesosphere. These strong horizontal velocity shears, together with Brunt-V?is?l? frequency squared obtained from the temperature profile, act collectively to yield two dynamical instability regions of Richardson number smaller than 1/4, suggesting that the saturated gravity wave spectrum observed by the chaff rockets in winter is a result of dynamical instability.

关键词： winter spectrum, strong shear, dynamical instability, spectrum saturation.

Global static stability and its relation to gravity waves in the middle atmosphere

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Earth and Planetary Physics 2020年第5期4卷 504-512页

作者： Xiao Liu jiyao xu Jia Yue Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control School of Mathematics and Information SciencesHenan Normal UniversityXinxiang Henan 453007China State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of SciencesBeijing 100190China School of Astronomyand Space Science University of the Chinese Academy of ScienceBeijing 100049China Catholic University of America WashingtonDC 20064USA National Aeronautics and Space Administration(NASA)Goddard Space Flight Center GreenbeltMD 20771USA

The global atmospheric static stability(N2)in the middle atmosphere and its relation to gravity waves(GWs)were investigated by using the temperature profiles measured by the Sounding of the Atmosphere using Broadband Emission Radiometry(SABER)instrument from 2002 to *** low latitudes,a layer with enhanced N2 occurs at an altitude of^20 km and exhibits annual oscillations caused by tropopause inversion *** an altitude of^70 km,enhanced N2 exhibits semiannual oscillations at low latitudes caused by the mesosphere inversion layers and annual oscillations at high latitudes resulting from the downward shift of the summer *** correlation coefficients between N2 and GW amplitudes can be larger than 0.8 at latitudes poleward of^40°N/*** observation provides factual evidence that a large N2 supports large-amplitude GWs and indicates that N2 plays a dominant role in maintaining GWs at least at high latitudes of the middle *** evidence also partially explains the previous results regarding the phase changes of annual oscillations of GWs at high latitudes.

关键词： atmospheric static stability gravity waves annual oscillation semiannual oscillation mesopause