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Changes in the Boreal Summer Intraseasonal Oscillation under Global Warming in CMIP6 Models

Advances in Atmospheric Sciences 2024年第10期41卷 1984-1998页

作者： Zhefan GAO Chaoxia YUAN Key Laboratory of meteorological Disaster of Ministry of Education Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Institute for Climate and Application Research (ICAR) Nanjing University of Information Science & Technology Application Laboratory Japan Agency of Marine-Earth Science and Technology

Changes in the activities of the Boreal Summer Intraseasonal Oscillation（BSISO） at the end of 21st century under the SSP5-8.5 scenario are assessed by adopting 17 CMIP6 models and the weak-temperature-gradient assumption. Results show that the intraseasonal variations become more structured. The BSISO-related precipitation anomaly shows a larger zonal scale and propagates further northward. However, there is no broad agreement among models on the changes in the eastward and northward propagation speeds and the frequency of individual phases. In the western North Pacific（WNP）, the BSISO precipitation variance is significantly increased, at 4.62% K-1, due to the significantly increased efficiency of vertical moisture transport per unit of BSISO apparent heating. The vertical velocity variance is significantly decreased, at -3.51% K-1, in the middle troposphere, due to the significantly increased mean-state static stability. Changes in the lower-level zonal wind variance are relatively complex, with a significant increase stretching from the northwestern to southeastern WNP, but the opposite in other regions. This is probably due to the combined impacts of the northeastward shift of the BSISO signals and the reduced BSISO vertical velocity variance under global warming. Changes in strong and normal BSISO events in the WNP are also compared. They show same-signed changes in precipitation and large-scale circulation anomalies but opposite changes in the vertical velocity anomalies. This is probably because the precipitation anomaly of strong（normal） events changes at a rate much larger（smaller） than that of the meanstate static stability, causing enhanced（reduced） vertical motion.

关键词： Boreal Summer Intraseasonal Oscillation CMIP6 global warming weak-temperature-gradient assumption

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Forecasting tropical cyclone coastal and marine hazards and impacts

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Tropical Cyclone Research and Review 2024年第1期13卷 1-14页

作者： Nadao Kohno Cody Fritz Monica Sharma Robbie Berg Diana Greenslade Devon Telford Sakeasi Rabitu P.L.N.Murty M.Mohapatra Maria Cristina C.Uson japan meteorological agency TokyoJapan National Hurricane Center MiamiUSA India meteorological Department New DelhiIndia Bureau of Meteorology MelbourneAustralia Environment and Climate Change Canada QuebecCanada Fiji meteorological Service NadiFiji Philipine Atmospheric Geophysical and Astronomical Services AdministrationQuezon CityPhilippines

The report highlights the signiﬁcant progress over various regions with respect to understanding of coastal hazards,numerical modeling techniques and the generation&dissemination of coastal hazard warnings and *** developments over various regions in the globe during 2014–18 have been discussed in this report as presented during 10th Session of International Workshop on Tropical Cyclones(IWTC-X)at Bali,*** speciﬁcally,various regions have started to confront the uncertainty that cannot be removed from TC analyses and forecasts and further communicate those hazards within the context of risk[probabilistic]based *** also includes impact-based forecasts such as communicating coastal inundation information relative to total water level instead of storm surge,speciﬁcally(i.e.,anomaly from as-tronomical tide and waves).Lastly,updates to model grid conﬁguration,model resolution,and coupled dynamical systems continue to resolve the costal hazards more *** approaches have likely helped reduce loss of life relative to historical ***,regions agree that the generation and dissemination of coastal hazard information still need to be improved in view of growing population along the coast and thus increased exposure of life to coastal hazard.

关键词： Coastal inundation Storm surge Probabilistic forecast

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Atlantic blocking events in a simplified nonlinear baroclinic model for local finite-amplitude wave activity

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Atmospheric and Oceanic Science Letters 2024年第4期17卷 41-45页

作者： Ning Shi Bamidele Abiodun Paul Wencai Liu Collaborative Innovation Center on Forecast and Evaluation of meteorological Disasters School of Atmospheric SciencesNanjing University of Information Science and TechnologyNanjingChina Nigerian meteorological agency AbujaNigeria

为研究北大西洋阻高的形成机制,本文在局部有限振幅波活动(LWA)框架下进行了一系列数值实验.采用的数值模型能显式地描绘出两种重要的大气内部动力过程,即非线性纬向位涡通量和Rossby波包传播.模拟结果显示,这两种动力学过程均是形成大... 详细信息

为研究北大西洋阻高的形成机制,本文在局部有限振幅波活动(LWA)框架下进行了一系列数值实验.采用的数值模型能显式地描绘出两种重要的大气内部动力过程,即非线性纬向位涡通量和Rossby波包传播.模拟结果显示,这两种动力学过程均是形成大西洋阻高的重要机理.具体地,非线性纬向位涡通量和Rossby波包传播,分别是大西洋阻高南部和北部LWA形成的主导因子.因此,本研究综合了前人关于大西洋阻高的研究成果,为其形成机理提供了新的认识.

关键词：斜压模式局地有限振幅波活动罗斯贝波传播非线性效应

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Optimization of body configuration and joint-driven attitude stabilization for transformable spacecraft under solar radiation pressure

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Astrodynamics 2024年第1期8卷 47-60页

作者： Yuki Kubo Toshihiro Chujo Institute of Space and Astronautical Science Japan Aerospace Exploration AgencyKanagawa252-5210Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo152-8550Japan

The solar sail is one of the most promising space exploration systems due to its theoretically infinite specific impulse achieved through solar radiation pressure(SRP).Recently,researchers have proposed“transformable spacecraft”capable of actively reconfiguring their body configurations using actuatable *** spacecraft,if used similarly to solar sails,are expected to significantly enhance orbit and attitude control capabilities owing to their high redundancy in control degrees of ***,controlling them becomes challenging due to their large number of inputs,leading previous researchers to impose strong constraints to limit their potential control *** study focuses on novel attitude control techniques for transformable spacecraft under *** developed two methods,namely,joint angle optimization to obtain arbitrary SRP force and torque,and momentum damping control driven by joint angle *** proposed methods are formulated in a general manner and can be applied to any transformable spacecraft comprising front faces that can predominantly receive the SRP on each *** validity of our proposed method is confirmed through numerical *** study contributes to making most of the high control redundancy of transformable spacecraft without the need for expendable propellants,thus significantly enhancing the orbit and attitude control capabilities.

关键词： solar sail transformable spacecraft attitude-joint coupled motion attitudestabilization

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Traditional Meiyu-Baiu has been suspended by global warming

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National Science Review 2024年第7期11卷 126-134页

作者： Zhicong Yin Xiaolei Song Botao Zhou Wenhao Jiang Huopo Chen Huijun Wang Key Laboratory of meteorological Disaster Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&Technology Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences

More than 1000 years, the Meiyu–Baiu have shaped the uniqueness of natural resources, civilization and culture in the Yangtze River Basin of China and the main islands of japan. In recent decades, frequent rainstorms and droughts have seemingly diminished the misty features of traditional Meiyu–Baiu ***, there is still no consensus on whether their traditional nature is suspended. In this study, we quantitatively demonstrate that the Meiyu–Baiu almost completely lost their traditional features during 1961–2023, ～80% of which can be attributed to anthropogenic warming. Furthermore, in a warmer future,the traditional Meiyu–Baiu will be more unlikely to appear. This study underscores the urgency in adapting to climate shift because destructive extremes are measurably taking the place of mild and maternal rains.

关键词： global warming Meiyu–Baiu extremes human activity culture and civilization

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Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 365-378页

作者： Koji Hata Sumio Niunoya Kazuhei Aoyagi Nobukatsu Miyara Obayashi Corporation Technology Research InstituteTechnology DivisionKiyoseTokyo204-8558Japan Obayashi Corporation Nuclear Facilities DivisionSinagawaTokyo108-8502Japan japan Atomic Energy agency Horonobe Underground Research CenterHoronobeHokkaido098-3224Japan

Excavation of underground caverns,such as mountain tunnels and energy-storage caverns,may cause the damages to the surrounding rock as a result of the stress *** this influenced zone,new cracks and discontinuities are created or propagate in the rock ***,it is effective to measure and evaluate the acoustic emission(AE)events generated by the rocks,which is a small elastic vibration,and permeability *** authors have developed a long-term measurement device that incorporates an optical AE(O-AE)sensor,an optical pore pressure sensor,and an optical temperature sensor in a single multi-optical measurement probe(MOP).japan Atomic Energy agency has been conducting R&D activities to enhance the reliability of high-level radioactive waste(HLW)deep geological disposal *** a high-level radioactive disposal project,one of the challenges is the development of methods for long-term monitoring of rock mass ***,in January 2014,the long-term measurements of the hydro-mechanical behavior of the rock mass were launched using the developed MOP in the vicinity of 350 m below the surface at the Horonobe Underground Research *** measurement results show that AEs occur frequently up to 1.5 m from the wall during *** addition,hydraulic conductivity increased by 2e4 orders of *** analysis revealed that the hydraulic behavior of the rock mass affected the pore pressure fluctuations and caused *** on this,a conceptual model is developed to represent the excavation damaged zone(EDZ),which contributes to the safe geological disposal of radioactive waste.

关键词： Excavation damaged zone(EDZ) Optical sensor Long-term monitoring Acoustic emission(AE) Shaft sinking

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Low-Energy Spin Excitations in Detwinned FeSe

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Chinese Physics Letters 2024年第6期41卷 112-118页

作者：刘瑞鲜 Mitsutaka Nakamura Kazuya Kamazawa 鲁兴业 Center for Advanced Quantum Studies School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China J-PARC Center Japan Atomic Energy Agency(JAEA)TokaiIbaraki 319-1195Japan Research Center for Neutron Science and Technology Comprehensive Research Organization for Science and SocietyTokaiIbaraki 319-1106Japan

Antiferromagnetic spin fluctuation is regarded as the leading driving force for electron pairing in high-Tc *** iron-based superconductors,spin excitations at low energy range,especially the spin-resonance mode at ER~5kBTc,are important for understanding the ***,we use inelastic neutron scattering(INS)to investigate the symmetry and in-plane wave-vector dependence of low-energy spin excitations in uniaxial-strain detwinned Fe *** low-energy spin excitations(E<10 meV)appear mainly at Q=(±1,0)in the superconducting state(T9K)and the nematic state(T90 K),confirming the constant C_(2) rotational symmetry and ruling out the C_(4) mode at E≈3 meV reported in a prior INS ***,our results reveal an isotropic spin resonance in the superconducting state,which is consistent with the s±wave pairing *** slightly higher energy,low-energy spin excitations become highly *** full width at half maximum of spin excitations is elongated along the transverse *** Q-space isotropic spin resonance and highly anisotropic low-energy spin excitations could arise from dyz intra-orbital selective Fermi surface nesting between the hole pocket aroundΓpoint and the electron pockets centered at MX point.

关键词： excitation symmetry slightly

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Regional Climate Damage Quantification and Its Impacts on Future Emission Pathways Using the RICE Model

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Advances in Atmospheric Sciences 2024年第9期41卷 1843-1852页

作者： Shili YANG Wenjie DONG Jieming CHOU Yong ZHANG Weixing ZHAO Beijing meteorological Observation Centre Beijing Meteorological BureauBeijing 100089China School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082China Beijing Normal University Beijing 100101China CMA Institute for Development and Programme Design Beijing 100081China

This study quantified the regional damages resulting from temperature and sea level changes using the Regional Integrated of Climate and Economy(RICE)model,as well as the effects of enabling and disabling the climate impact module on future emission *** highlight varied damages depending on regional economic development and ***,China and Africa could suffer the most serious comprehensive damages caused by temperature change and sea level rise,followed by India,other developing Asian countries(OthAsia),and other high-income countries(OHI).The comprehensive damage fractions for China and Africa are projected to be 15.1%and 12.5%of gross domestic product(GDP)in 2195,with corresponding cumulative damages of 124.0 trillion and 87.3 trillion United States dollars(USD)from 2005 to 2195,***,the comprehensive damage fractions in japan,Eurasia,and Russia are smaller and projected to be lower than 5.6%of GDP in 2195,with cumulative damages of 6.8 trillion,4.2 trillion,and 3.3 trillion USD,***,coastal regions like Africa,the European Union(EU),and OHI show comparable damages for sea level rise and temperature *** China,however,sea level-induced damages are projected to exceed those from temperature ***,this study indicates that switching the damage modules on or off affects the regional and global emission trajectories,but the magnitude is relatively *** 2195,global emissions under the experiments with all of the damage modules switched off,only the sea level damage module switched on,and only the temperature damage module switched on,were 3.5%,2.3%and 1.2%higher than those with all of the damage modules switched on,respectively.

关键词： climate damage integrated assessment model carbon emissions sea level rise temperature change

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The 2023 Turkey earthquake doublet: Earthquake relocation, seismic tomography, and stress field inversion

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Earth and Planetary Physics 2024年第3期8卷 535-548页

作者： HuiLi Zhan Ling Bai Bagus Adi Wibowo ChaoYa Liu Kazuo Oike Yuzo Ishikawa State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Center of Earthquake and Tsunami Agency of MeteorologyClimatology and GeophysicsJakarta 10610Indonesia University of Shizuoka Shizuoka 422-8526Japan Shizuoka University Shizuoka 422-8529Japan

On February 6,2023,two earthquakes with magnitudes of M_(W) 7.8 and M_(W) 7.5 struck southeastern Turkey,causing significant casualties and economic *** seismic events occurred along the East Anatolian Fault Zone,a convergent boundary between the Arabian Plate and the Anatolian *** this study,we analyze the M_(W) 7.8 and M_(W) 7.5 earthquakes by comparing their aftershock relocations,tomographic images,and stress field *** earthquakes were localized in the upper crust and exhibited steep dip ***,the aftershocks occurred either close to the boundaries of low and high P-wave velocity anomaly zones or within the low P-wave velocity anomaly *** East Anatolia Fault,associated with the M_(W) 7.8 earthquake,and the SürgüFault,related to the M_(W) 7.5 earthquake,predominantly experienced shear ***,their western sections experienced a combination of strike-slip and tensile stresses in addition to shear *** ruptures of the M_(W) 7.8 and M_(W) 7.5 earthquakes appear to have bridged a seismic gap that had seen sparse seismicity over the past 200 years prior to the 2023 Turkey earthquake sequence.

关键词： Turkey earthquake doublet earthquake relocation seismic tomography stress field seismicity

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中子表征技术在金属结构材料研究中的应用

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金属学报 2024年第8期60卷 1001-1016页

作者：王延绪龚武苏玉华李昺中国科学院金属研究所沈阳材料科学国家研究中心沈阳110016 japan Proton Accelerator Research Complex Center Japan Atomic Energy AgencyTokai Ibaraki 319-1195Japan

结构材料的原子结构、微观组织与宏观性能的关联性是材料研究的核心问题之一,历久弥新。近年来,加速器基中子源大科学装置的建设和相关实验技术取得了长足进步,这为在实时原位条件下深入研究该问题提供了良好的基础。本文介绍了中子衍射... 详细信息

结构材料的原子结构、微观组织与宏观性能的关联性是材料研究的核心问题之一,历久弥新。近年来,加速器基中子源大科学装置的建设和相关实验技术取得了长足进步,这为在实时原位条件下深入研究该问题提供了良好的基础。本文介绍了中子衍射、Bragg边成像、小角中子散射、对分布函数分析、准弹性/非弹性中子散射等主要中子表征技术在结构材料中应用的最新进展,着重论述了钢铁材料相变内应力起源与演化、镁合金等轻金属材料的变形机制、基于Bragg边成像的微观结构及残余应力分析,并对今后发展趋势进行了简要展望。

关键词：中子散射相变弹塑性变形结构材料

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