检索结果-南通市图书馆

Urban Heat Island Investigations in Arctic Cities of Northwestern Russia

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2017年第6期31卷 1161-1166页

作者： Oleg I.SHUMILOV Elena A.KASATKINA Alexander G.KANATJEV polar geophysical institute Apatity 184209Russia

Urban microclimate peculiarities in two Arctic cities in northwestern Russia--Kirovsk （67.62°N, 33.67°E） and Apatity （67.57°N, 33.38°E）-were investigated by using mobile temperature records. The experiment was carried out in and around Apatity and Kirovsk in February 2014 and December 2016. The DS 18B20 digital thermometer was in- stalled on the roof of a car （height： approximately 1.2 m） to measure and record temperature variations automatically. In addition to the digital thermometer, the car was also equipped with an onboard global positioning system, allow- ing every temperature measurement to be referenced with an altitude and a latitude/longitude position. The possibility of urban heat island formation in these polar cities, above the Arctic Circle, was studied. Our analysis indicated that on 11 February 2014, the temperature varied in accordance with the background environmental lapse rate （-0.0045℃ m^-1）, and nearly corresponded to it （-0.0165℃ m^-1） on 12 February 2014. On 6 December 2016, a strong local temperature inversion with a positive value of 0.032℃ m^-1 was detected, seemingly caused by the formation of a cold air pool in the valley near Kirovsk. It was found that the temperature variations within and outside these cities are strongly influenced by local topographic effects and the physical conditions of the atmospheric boundary layer.

关键词： urban microclimate topo-climate urban heat island mobile temperature measurement

An application of a seismic nodal system with seismic ambient noise near Kunlun Station, Antarctica: estimating ice thickness and firn structure

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第02期 323-336页

作者： YuQiao Chen Peng Yan YuanDe Yang XueKe Huang Fei Li Chinese Antarctic Center of Surveying and Mapping Wuhan University Key Laboratory of polar Environment Monitoring and Public Governance (Wuhan University) Ministry of Education Courant institute of Mathematical Sciences New York University Department of Earth and Space Sciences Southern University of Science and Technology

The thickness and upper densification structure of an ice sheet are important parameters for dynamic ice sheet modeling and glacier mass balance studies. Seismic ambient noise methods, such as the horizontal-to-vertical spectral ratio(H/V) method and ambient noise cross-correlation method, are becoming increasingly popular in glacier structure investigations. During China's 39th expedition to Antarctica, seismic ambient noise experiments were conducted to investigate the structure of the ice sheet at Kunlun Station, Dome A,using a seismic nodal system. We obtained a broad band(0.1–10 Hz) H/V curve with a 1-hour noise record from a seismic node. In addition, we extracted the Rayleigh wave dispersion curve with 5-day noise cross-correlation functions from a linear dense seismic *** clear peaks were observed in the H/V curve — a lower peak at ～0.17 Hz and two higher frequency peaks at ～3 Hz and ～6 Hz. We inverted the ice sheet thickness using the lower frequency portion of the H/V curve and inverted the upper structure of the ice sheet using the higher frequency portion of the H/V curve jointly with the dispersion curve. Our estimations from ambient noise observations were consistent with those derived from the BedMachine ice sheet thickness dataset and the density profile determined by ground-penetrating radar investigations at the same site.

关键词：

Vision Transformer for Extracting Tropical Cyclone Intensity from Satellite Images

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2025年第1期42卷 79-93页

作者： Ye TIAN Wen ZHOU Paxson KYCHEUNG Zhenchen LIU Low-Carbon and Climate Impact Research Centre School of Energy and EnvironmentCity University of Hong KongSARChina Key Laboratory of polar Atmosphere-ocean-ice System for Weather and Climate Ministry of Education&Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric SciencesFudan UniversityShanghai 200433China

Tropical cyclone(TC)intensity estimation is a fundamental aspect of TC monitoring and *** learning models have recently been employed to estimate TC intensity from satellite images and yield precise *** work proposes the ViT-TC model based on the Vision Transformer(ViT)*** images of TCs,including infrared(IR),water vapor(WV),and passive microwave(PMW),are used as inputs for intensity *** indicate that combining IR,WV,and PMW as inputs yields more accurate estimations than other channel *** ensemble mean technique is applied to enhance the model's estimations,reducing the root-mean-square error to 9.32 kt(knots,1 kt≈0.51 m s^(-1))and the mean absolute error to 6.49 kt,which outperforms traditional methods and is comparable to existing deep learning *** model assigns high attention weights to areas with high PMW,indicating that PMW magnitude is essential information for the model's *** model also allocates significance to the cloud-cover region,suggesting that the model utilizes the whole TC cloud structure and TC eye to determine TC intensity.

关键词： Vision Transformer tropical cyclones intensity estimation deep learning

中国东部平原湖区现代沉积植物DNA的保存及其与土地利用的关系

在线全文

学校读者我要写书评

暂无评论

第四纪研究 2025年第1期45卷 213-226页

作者：吴铠李凯林琪贾伟瀚葛亚汶 Kathleen R.Stoof-Leichsenring Ulrike Herzschuh 倪健浙江师范大学生命科学学院中国科学院南京地理与湖泊研究所 polar Terrestrial Environmental Systems Research Group Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research institute of Environmental Science and Geography University of Potsdam 河北师范大学资源与环境科学学院 institute of Biochemistry and Biology University of Potsdam

东部平原湖区湖泊众多，但普遍面临富营养化和流域植被破坏问题，使其成为现代生态保护和探究人类活动对湖泊生态系统干扰研究的热点地区。湖泊沉积DNA技术近年来开始被用于湖泊水生植物调查以及流域植被重建等工作，但是该技术在我国... 详细信息

东部平原湖区湖泊众多，但普遍面临富营养化和流域植被破坏问题，使其成为现代生态保护和探究人类活动对湖泊生态系统干扰研究的热点地区。湖泊沉积DNA技术近年来开始被用于湖泊水生植物调查以及流域植被重建等工作，但是该技术在我国东部平原湖区的适用性以及植物DNA信号与湖周及流域植被的关系，有待于进一步评估。本研究选择东部平原湖区的22个湖泊为研究对象，利用植物DNA宏条形码技术使用通用植物引物trnL g-h对湖泊表层沉积物中的植物DNA进行扩增并进行高通量测序，结合湖泊形态特征、水体及沉积物理化参数以及湖泊周边土地利用类型等，揭示不同湖泊沉积物中植物DNA保存丰富度的差异及其影响因素，探讨了陆生植物DNA对植被的代表性。结果表明，植物DNA宏条形码共记录230个类群，其中28%的序列可以鉴定至种水平，在分类学分辨率以及鉴定效率上沉积植物DNA相较于花粉分析具有一定优势。与花粉检测的区域性植被信号不同，湖泊沉积植物DNA反映的是局地或者湖泊周边植被组成，可对湖周森林、农田以及建筑用地中的优势植物信号进行区分，凸显了沉积植物DNA在东部平原湖区进行局地植被重建中的适用性。此外，年均降水量以及流域下垫面性质对陆生沉积植物DNA丰度具有重要影响，同时年均温也是影响沉积植物DNA保存的重要因素。综上，在东部平原湖区，湖泊沉积植物DNA技术可为揭示长期人类活动影响下的局地植被组成变化提供支持，但这同样依赖于对湖泊沉积植物DNA现代过程的进一步研究和理解。

关键词：沉积物DNA 植物DNA 宏条形码土地利用类型东部平原湖区

同方期刊数据库

Radar isochronic layer dating for a deep ice core at Kunlun Station, Antarctica

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第2期63卷 303-308页

作者： Xueyuan TANG Bo SUN Tiantian WANG polar Research institute of China

The ages and accumulation rates of ice are important boundary conditions for paleoclimatic ice models. Radardetected isochronic layers can be used to date the ice column beneath the ice surface and infer past accumulation rates. A Deep Ice-Core Drilling Project has been carried out at Kunlun station in the Dome A region, East Antarctica. Radio echo sounding data are collected during the 2004/2005 Chinese National Research Expedition and the 2007/2008 Dome Connection East Antarctica project of the Alfred Wegener institute(Germany). Radar isochronic layers from the dataset were linked to compare a new deep ice core site from Kunlun station and the Vostok ice core site. Ten visible layers, accounting for ~50% ice thickness at the Kunlun station ice core site, were dated based on the Vostok ice core chronology. At 1,640 m depth below surface, an age of ~160,400 yr was determined, corresponding to a bright layer at Kunlun station. These layers provided geometric information on the past surface of the ice sheet around the ice core site through the Wisconsin glacial stage, Eemian interglacial and Marine Isotope Stage6. Based on a simple ice flow model and the age-depth relationship, we concluded that the region around the Kunlun ice core site had lower past accumulation rates, consistent with the present pattern. The age-depth relationship would thus be expected to correlate and constrain the chronology of the deep ice core at Kunlun station in the future.

关键词： Kunlun station Ice core Radar isochronic layers Age-depth relationship East Antarctic ice sheet

Performance of CRA-40 reanalysis in representing the Antarctic winter stratospheric circulation: a comparison with ERA-5 and MERRA-2

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第02期 452-459页

作者： ZiXu Wang JingGao Hu Jing-Jia Luo Jian Rao ZongZe Li LiuChi Yan Key Laboratory of Meteorological Disaster Ministry of Education (KLME) Joint International Research Laboratory of Climate and Environment Change (ILCEC) Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) Nanjing University of Information Science & Technology institute for Climate and Application Research (ICAR) Nanjing University of Information Science and Technology State Key Laboratory of Numerical Modeling for Atmospheric Sciences and geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

This paper evaluates a representation of winter stratospheric circulation in the Antarctic that is based on CRA-40, a 40-year global reanalysis dataset released by the China Meteorological Administration, and compares it with representations based on two other state-of-the-art reanalysis datasets: the fifth-generation atmospheric reanalysis provided by the European Centre for Medium-Range Weather Forecasts(ERA-5) and the Modern-Era Retrospective analysis for Research and Applications, version 2(MERRA-2). In terms of climatology, we find that CRA-40 portrays a stronger and colder polar vortex in the middle and lower stratosphere than ERA-5, but a weaker and warmer one than MERRA-2. However, disagreement among the three reanalyses is confined mainly to the period before1999, and is largely reduced after that time. On the interannual timescale, portrayals of the intensity and area of the 10-hPa polar vortex are quite consistent among the three reanalyses, with correlation coefficients greater than 0.9 between each pair of reanalyses. In addition, the central dates of most sudden stratospheric deceleration(SSD) events at 10 hPa in the three reanalyses differ by less than one day, indicating that CRA-40 is also highly consistent with the other two reanalysis datasets regarding daily evolution. Our analyses suggest that CRA-40 performs comparably to ERA-5 and MERRA-2 in characterizing winter circulation in the Antarctic middle and lower stratosphere.

关键词：

Predictability Study of Weather and Climate Events Related to Artificial Intelligence Models

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2025年第1期42卷 1-8页

作者： Mu MU Bo QIN Guokun DAI Department of Atmospheric and Oceanic Sciences&institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Shanghai Key Laboratory of Ocean-land-atmosphere Boundary Dynamics and Climate Change Fudan UniversityShanghai 200438China Shanghai Frontiers Science Center of Atmosphere-Ocean Interaction Fudan UniversityShanghai 200438China CMA-FDU Joint Laboratory of Marine Meteorology Shanghai 200438China Key Laboratory of polar Atmosphere-ocean-ice System for Weather and Climate Ministry of EducationShanghai 200438China

Conducting predictability studies is essential for tracing the source of forecast errors,which not only leads to the improvement of observation and forecasting systems,but also enhances the understanding of weather and climate *** the past few decades,dynamical numerical models have been the primary tools for predictability studies,achieving significant ***,with the advances in artificial intelligence(AI)techniques and accumulations of vast meteorological data,modeling weather and climate events using modern data-driven approaches is becoming trendy,where FourCastNet,Pangu-Weather,and GraphCast are successful *** this perspective article,we suggest AI models should not be limited to forecasting but be expanded to predictability studies,leveraging AI's advantages of high efficiency and self-contained optimization *** this end,we first remark that AI models should possess high simulation capability with fine spatiotemporal resolution for two kinds of predictability *** models with high simulation capabilities comparable to numerical models can be considered to provide solutions to partial differential equations in a data-driven ***,we highlight several specific predictability issues with well-determined nonlinear optimization formulizations,which can be well-studied using AI models,holding significant scientific *** addition,we advocate for the incorporation of AI models into the synergistic cycle of the cognition–observation–model *** predictability studies have the potential to transform“big data”to“big and better data”and shift the focus from“AI for forecasts”to“AI for science”,ultimately advancing the development of the atmospheric and oceanic sciences.

关键词： predictability artificial intelligence models simulation and forecasting nonlinear optimization cognition–observation–model paradigm

Einstein Probe discovery of EP240408a:A peculiar X-ray transient with an intermediate timescale

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 218-236页

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong Chen Nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang Bing Zhang Chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin Chengkui Li Junfei Li Longhui Li Maoshun Li Wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China institute of Space Sciences(ICE) CSICBarcelona E-08193Spain Institut d’Estudis Espacials de Catalunya(IEEC) Barcelona E-08034Spain Max Planck institute for Extraterrestrial Physics Garching 85748Germany Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 201210China Department of Physics University of Hong KongHong Kong 999077China School of Physics and Astronomy University of LeicesterLeicester LE17RHUK School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China Department of Physics Anhui Normal UniversityWuhu 241002China Shanghai institute of Technical Physics Chinese Academy of SciencesShanghai 200083China Physics Department Tsinghua UniversityBeijing 100084China Nevada Center for Astrophysics University of Nevada Las VegasLas Vegas NV 89154USA Department of Physics and Astronomy University of Nevada Las VegasLas Vegas NV 89154USA South African Astronomical Observatory Cape Town 7935South Africa Department of Astronomy University of Cape TownRondebosch 7701South Africa Department of Physics University of the Free StateBloemfontein 9300South Africa Universit´e Paris Cit´e CNRSAstroparticule et CosmologieParis F-75013France Universit´e Paris Cit´e CEA Paris-SaclayIRFU/DAp-AIMGif-sur-Yvette 91191France Department of Astronomy Guangzhou UniversityGuangzhou 510006China Cosmic Dawn Center(DAWN) Copenhagen 2200Denmark Niels Bohr institute University of CopenhagenCopenhagen 2200Denmark Department of Physics and Astronomy Rutgersthe State University of New JerseyPiscataway NJ 08854-8019USA institute for Cosmic Ray Research The University of TokyoKashiwa City 277-8582Japan ESA/ESTEC Noordwijk 2201 AZThe Netherlands Department of Astronom

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe(EP)and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope(WXT)on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for 12 *** flare reached a peak flux of 3:9×10^(−9) erg cm^(−2) s^(−1) in 0.5-4 keV,∼300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 keV,with a power-law photon index varying within *** X-ray light curve shows a plateau lasting for∼4 d,followed by a steep decay till becoming undetectable∼10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of∼10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients Einstein Probe

Sensitivity of the Arctic sea ice concentration forecasts to different atmospheric forcing: a case study

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第12期33卷 15-23页

作者： YANG Qinghua LIU Jiping ZHANG Zhanhai SUI Cuijuan XING Jianyong LI Ming LI Chunhua ZHAO Jiechen ZHANG Lin Physical Oceanography Laboratory Ocean University of China polar Environmental Research and Forecasting Division National Marine Environmental Forecasting Center State Key Laboratory of Numerical Modeling for Atmospheric Sciences and geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Key Laboratory for polar Science of State Oceanic Administration Polar Research Institute of China

A regional Arctic configuration of the Massachusetts institute of Technology general circulation model （MIT-gcm） is used as the coupled ice-ocean model for forecasting sea ice conditions in the Arctic Ocean at the Na-tional Marine Environmental Forecasting Center of China （NMEFC）, and the numerical weather prediction from the National Center for Environmental Prediction Global Forecast System （NCEP GFS） is used as the atmospheric forcing. To improve the sea ice forecasting, a recently developed polar Weather Research and Forecasting model （polar WRF） model prediction is also tested as the atmospheric forcing. Their forecasting performances are evaluated with two different satellite-derived sea ice concentration products as initializa-tions：（1） the Special Sensor Microwave Imager/Sounder （SSMIS） and （2） the Advanced Microwave Scanning Radiometer for EOS （AMSR-E）. Three synoptic cases, which represent the typical atmospheric circulations over the Arctic Ocean in summer 2010, are selected to carry out the Arctic sea ice numerical forecasting experiments. The evaluations suggest that the forecasts of sea ice concentrations using the polar WRF atmo-spheric forcing show some improvements as compared with that of the NCEP GFS.

关键词： Arctic Ocean seaice concentration forecast