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Linkage Between Mei-yu Precipitation and North Atlantic SST on the Decadal Timescale

Advances in Atmospheric sciences 2009年第1期26卷 101-108页

作者：顾薇李崇银王鑫周文李维京 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 National Climate Center China Meteorological Administration Beijing 100081 Meteorological College PLA University of Science and Technology Nanjing 211101 City U-IAP Laboratory for Atmospheric SciencesDepartment of Physics & Materials Science City University of Hong Kong Hong Kong

This paper investigates the relationship between mei-yu and North Atlantic sea surface temperature anomalies （SSTA）. Results show that they are significantly associated with each other on the decadal timescale. Both mei-yu precipitation and mei-yu duration are characterized by significant decadal variability. Their decadal components are closely correlated with a triple mode of North Atlantic SSTA in the preceding winter. Regression analysis demonstrates that the wintertime North Atlantic SSTA may impose a delayed impact on East Asia Summer Monsoon （EASM） circulation and mei-yu on the decadal timescale. The persistency of SSTA plays an important role during this course. The triple SSTA mode can persist from winter until late spring. It is suggested that the springtime SSTA may excite a stationary wave-train propagating from west Eurasia to East Asia and exert an impact on mei-yu.

关键词： mei-yu decadal North Atlantic SSTA

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The S-PLUS Ultra-Short Survey: Photometric Re-calibration with the BEst STar Database

arXiv

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arXiv 2025年

作者： Li, Xiaolu Xiao, Kai Huang, Yang Yuan, Haibo Tang, Yanke Beers, Timothy C. Huang, Bowen Ma, Mingyang Humire, Pedro K. Alvarez-Candal, Alvaro Sestito, Federico Gai, Ning Mao, Yongna Gu, Hongrui Tao, Zhenzhao Yang, Lin Xu, Shuai Hu, Rong College of Physics and Electronic information Dezhou University Dezhou253023 China International Centre of Supernovae Yunnan Key Laboratory Kunming650216 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing100049 China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Beijing102206 China CAS Key Lab of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China School of Physics and Astronomy Beijing Normal University No.19 Xinjiekouwai St Haidian District Beijing100875 China University of Notre Dame Notre DameIN46556 United States Departamento de Astronomia Instituto de Astronomia Geofísica e Ciências Atmosféricas da USP Cidade Universitária SP São Paulo05508-900 Brazil Instituto de Astrofísica de Andalucía CSIC Apt 3004 Granada18080 Spain Centre for Astrophysics Research Department of Physics Astronomy and Mathematics University of Hertfordshire HatfieldAL10 9AB United Kingdom College of Computer and Information Dezhou University Dezhou253023 China Institute for Astronomical Science Dezhou University Dezhou253023 China Department of Cyber Security Beijing Electronic Science and Technology Institute Beijing100070 China Department of Physics Beijing Technology and Business University Beijing100048 China

We present an independent validation and comprehensive re-calibration of S-PLUS Ultra-Short Survey (USS) DR1 12-band photometry using about 30,000–70,000 standard stars from the BEst STar (BEST) database. We identify spatial variation of zero-point offsets, up to 30–40 mmag for blue filters (u, J0378, J0395) and 10 mmag for others, predominantly due to the higher uncertainties of the technique employed in the original USS calibration. Moreover, we detect large- and medium-scale CCD position-dependent systematic errors, up to 50 mmag, primarily caused by different aperture and flat-field corrections. We then re-calibrate the USS DR1 photometry by correcting the systematic shifts for each tile using second-order two-dimensional polynomial fitting combined with a numerical stellar flat-field correction method. The re-calibrated results from the XPSP and the SCR standards are consistent within 6 mmag in the USS zero-points, demonstrating both the typical precision of re-calibrated USS photometry and a sixfold improvement in USS zero-point precision. Further validation using SDSS and Pan-STARRS1, as well as LAMOST DR10 and Gaia photometry, also confirms this precision for the re-calibrated USS photometry. Our results clearly demonstrate the capability and the efficiency of the BEST database in improving calibration precision to the milli-magnitude level for wide-field photometric surveys. The re-calibrated USS DR1 photometry is publicly available (doi: 10.12149/101503). Copyright © 2025, The Authors. All rights reserved.

关键词： Systematic errors

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Full-Space Beam Scanning Antenna Based on Spoof Surface Plasmon Polaritons

Full-Space Beam Scanning Antenna Based on Spoof Surface Plas...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Zhicheng Wu Xianglin Kong Jun Wang Ruofeng Xu Lei Zhao Yinfang Xu School of Information and Control Engineering China University of Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

In this paper, a full-space beam scanning antenna based on spoof surface plasmon polaritons (SSPPs) is proposed. The proposed antenna is composed of a SSPPs loaded by the varactor diodes and periodic metallic patches. The periodic patches can transform the slow waves from SSPPs into fast waves, and the cutoff frequency can be reconfigured by changing the capacitance of the varactor diode, which will make the radiation angle of the beam change within a fixed frequency. Simulation results show that the radiation angle ranges from −90° to 90° at 9 GHz.

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Application of improved genetic ant colony optimization in radar resource interference allocation

Application of improved genetic ant colony optimization in r...

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IET International Radar Conference (IET IRC 2020)

作者： Y. Liao W. Guo L. Hu Harbin Engineering University Information and Communication Engineering Department Harbin China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

Under the condition of limited interference resources, how to maximize the benefits of multiple jammers interfering with multiple radars has become a research hotspot. This paper has designed a reasonable interference evaluation method. Aiming at the disadvantages of genetic algorithm and ant colony optimization, made some improvements, and combined genetic methods and ant colony optimization, besides, a new crossover and mutation method based on constraints is proposed, which overcomes the shortcomings of invalid iteration of genetic algorithm and easy to fall into local optimal solution of ant colony optimization. Through simulation analysis, the fused algorithm can reach the optimal value within a short number of iterations, improving the utilization efficiency of the jammer.

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Coupling of the Calculated Freezing and Thawing Front Parameterization in the Earth System Model CAS-ESM

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Advances in Atmospheric sciences 2023年第9期40卷 1671-1688页

作者： Ruichao LI Jinbo XIE Zhenghui XIE Binghao JIA Junqiang GAO Peihua QIN Longhuan WANG Si CHEN State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 101408China School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjing 210044China

The soil freezing and thawing process affects soil physical properties,such as heat conductivity,heat capacity,and hydraulic conductivity in frozen ground regions,and further affects the processes of soil energy,hydrology,and carbon and nitrogen *** this study,the calculation of freezing and thawing front parameterization was implemented into the earth system model of the Chinese Academy of sciences(CAS-ESM)and its land component,the Common Land Model(CoLM),to investigate the dynamic change of freezing and thawing fronts and their *** results showed that the developed models could reproduce the soil freezing and thawing process and the dynamic change of freezing and thawing *** regionally averaged value of active layer thickness in the permafrost regions was 1.92 m,and the regionally averaged trend value was 0.35 cm yr–*** regionally averaged value of maximum freezing depth in the seasonally frozen ground regions was 2.15 m,and the regionally averaged trend value was–0.48 cm yr–*** active layer thickness increased while the maximum freezing depth decreased year by *** results contribute to a better understanding of the freezing and thawing cycle process.

关键词： frozen ground freezing and thawing fronts maximum freezing depth active layer thickness earth system model CAS-ESM

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Source-Configured Microwave Plasmonic Vortices Based on Single Meta-Particle

Source-Configured Microwave Plasmonic Vortices Based on Sing...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xianglin Kong Lei Zhao Xiaopeng Shen Yinfang Xu School of Information and Control Engineering School of Materials Science and Physics China University Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

In this paper, generation of plasmonic vortices with tunable topologic charges is proposed in the microwave regime. Tunable vortices with topologic charges of 0, +1 and -1 can be configured by illuminating incident plane waves with linearly polarization (LP), left-circularly polarization (LHCP) and right-circularly polarization (RHCP) on a single meta-particle, respectively. A spiral meta-particle operating at 2.94 GHz is designed, fabricated and measured to demonstrate the source-configured characteristics. The results showed that simulation and test are consistent with the theoretical ones.

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Mechanically Beam-steering of Horn Antenna Using Non-uniform Flexible Meta-Surface

Mechanically Beam-steering of Horn Antenna Using Non-uniform...

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International Conference on Computer and Communications (ICCC)

作者： Zhiye Jiang Pei Zheng Yuwei Qiu Hailiang Zhu Chenyu Ding Gao Wei National Key Laboratory of Science and Technology on Test Physics &Numerical Mathematics Beijing China School of Electronics and Information Northwestern Polytechnical University Xi'an Shaanxi China

ISBN: (数字)9781728186351

ISBN: (纸本)9781728186368

Research on mechanically beam-steering of horn antenna using non-uniform meta-surface is presented in this paper. After optimizing the layout of quasi-I-shaped unit cell, we designed a flexible bi-layer meta-surface that can bring a main beam deflection of 40°. When the meta-surface is sliding along the long side of horn antenna, the main beam can be steered accordingly in a range of ±40°. A mechanically radiation reconfigurable antenna is thus achieved by a simple structure. Sliding of the meta-surface relative to the horn can be realized by a motor-driven conveyor belt when the prototype is fabricated in the following research.

关键词： Geometry Beam steering Horn antennas Conferences Layout Prototypes Bandwidth

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Optimization and Performance Modeling of Stencil Computations on ARM Architectures 22

Optimization and Performance Modeling of Stencil Computation...

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22nd IEEE International Conference on High Performance Computing and Communications, 18th IEEE International Conference on Smart City and 6th IEEE International Conference on Data science and Systems, HPCC-SmartCity-DSS 2020

作者： Zhang, Kaifang Su, Huayou Zhang, Peng Dou, Yong National University of Defense Technology National Key Laboratory for Parallel and Distribution Processing Changsha China Caep Software Center for High Performance Numerical Simulation Beijing China Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (纸本)9781728176499

Stencil Computation has long been an omnipresent kernel of a wide range of scientific and engineering applications. There is much work investigating the stencil performance on x86 processors and accelerators such as GPU. Meanwhile, ARM processors for HPC have been highlighted more and more with Fugaku of Japan becoming the first number one system on the TOP-500 list. In this paper, we focus on modeling and optimizing the performance of stencil computation on ARM architectures. Specifically, we proposed a performance model for stencil computation based on tiling optimization to guide the optimal configuration of tiling parameters for good cache reuse. We validate the proposed model with the Performance Monitor Unit (PMU) provided by the ARM processor. Experimental results show that the prediction error of the execution time can be lower to 1.37%. Furthermore, we can achieve a maximum of 1.26 \times speedup compared to the naive implementation according to the optimization parameters provided from the model. © 2020 IEEE.

关键词： ARM processors

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Interdecadal Change of the Relationship Between the Tropical Indian Ocean Dipole Mode and the Summer Climate Anomaly in China

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Acta meteorologica Sinica 2011年第2期25卷 129-141页

作者：赵姗姗周天军杨修群朱益民谭言科孙旭光 Division of Climate Impact Assessment National Climate Center State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences School of Atmospheric Sciences Nanjing University Institute of Meteorology PLA University of Science and Technology

The interdecadal change of the relationship between the tropical Indian Ocean dipole（IOD） mode and the summer climate anomaly in China is investigated by using monthly precipitation and temperature records at 210 stations in China and the NCEP/NCAR reanalysis data for *** results indicate that along with the interdecadal shift in the large-scale general circulation around the late 1970s,the relationship between the IOD mode and the summer climate anomaly in some regions of China has significantly *** the late 1970s,a developing IOD event is associated with an enhanced East Asian summer monsoon,which tends to decrease summer precipitation and increase summer temperature in South China;while after the late 1970s,it is associated with a weakened East Asian summer monsoon,which tends to increase（decrease） precipitation and decrease（increase） temperature in the south（north） of the Yangtze *** the next summer,following a positive IOD event,precipitation is increased in most of China before the late 1970s,while it is decreased（increased） south（north） of the Yangtze River after the late *** is no significant correlation between the IOD and surface air temperature anomaly in most of China in the next summer before the late 1970s;however,the IOD tends to increase the next summer temperature south of the Yellow River after the late 1970s.

关键词： tropical Indian Ocean dipole（IOD） summer climate anomaly in China interannual variability interdecadal change

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Comparison between Two HLL-type riemann solvers for strong shock calculation on ALE framework

Comparison between Two HLL-type riemann solvers for strong s...

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International MultiConference of Engineers and Computer Scientists 2015, IMECS 2015

作者： Shen, Zhijun Yan, Wei National Key Laboratory of Science and Technology on Computational Physics Institute of Applied Physics and Computational Mathematics P.O. Box 8009-26 Beijing100088 China

ISBN: (纸本)9789881925329

This paper investigates solution behaviors under the strong shock interaction for moving mesh schemes based on the one-dimensional HLL-type Riemann solvers. numerical experiments show that some schemes which updates the flow parameters directly on the moving mesh without using interpolation, may suffer from severe instability such as grid distortion. But the HLL solver can be free from such failings. It is well known that the numerical schemes on a fixed grid that can capture contact discontinuity accurately usually suffer from some disastrous carbuncle phenomenon, while others, such as the HLL scheme, are free from this kind of shock instability. Due to such high similarity, a research to combine the grid deformation and the numerical shock instability is developed. Furthermore, in order to unveil the cause of producing these failings, a HLL-type solver (denoted as the HLLS) with shear wave is constructed for inviscid, compressible gas flows and implemented into the arbitrary Lagrangian Eulerian (ALE) method. With the vorticity viscosity vanishing, the ALE HLLS scheme produce some numerical instability phenomena. This result indicates that viscosity associated to the shear wave may be unique reason to cause the instability or nonphysical deformation.

关键词： Shear waves

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