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Circulation Pattern Controls of Summer Temperature Anomalies in Southern Africa

Advances in Atmospheric Sciences 2024年第2期41卷 341-354页

作者： Chibuike Chiedozie IBEBUCHI Cameron C.LEE Department of geography Kent State UniversityKentOhio 44242USA ClimRISE lab Kent State UniversityKentOhio 44242USA

This study investigates the relationship between circulation patterns and austral summer temperature anomalies in southern Africa. The results show that the formation of continental lows tends to increase the thickness of the lower atmosphere. Further, the distinct variabilities of high and low pressure under the circulation types, influence air mass advection from the adjacent oceans, as well as atmospheric stability over land. Stronger anticyclonic circulation at the western branch of the Mascarene high-pressure system enhances the low-level cold air advection by southeast winds,decreases the thickness, and lowers the temperature over a majority of the land in southern Africa. Conversely, a weaker Mascarene High, coupled with enhanced cyclonic activity in the southwest Indian Ocean increases low-level warm air advection and increases temperature anomalies over vast regions in southern Africa. The ridging of a closed South Atlantic anticyclone at the southern coast of southern Africa results in colder temperatures near the tip of southern Africa due to enhanced low-level cold air advection by southeast winds. However, when the ridge is weak and westerly winds dominate the southern coast of southern Africa, these areas experience temperature increases. The northward track of the Southern Hemisphere mid-latitude cyclone, which can be linked to the negative Southern Annular Mode, reduces the temperature in the southwestern part of southern Africa. Also, during the analysis period, El Ni?o was associated with temperature increases over the central parts of southern Africa;while the positive Indian Ocean dipole was linked to a temperature increase over the northeastern, northwestern, and southwestern parts of southern Africa.

关键词： temperature circulation types Subtropical Indian Ocean dipole Southern Annular Mode El Ni?o Indian Ocean dipole Mascarene High South Atlantic anticyclone

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The Holocene Palaeoclimatic change in southern vicinity of Tengger Desert

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Chinese Science Bulletin 1999年第6期44卷 550-555页

作者： H.-J. Pachur B. Wuenneman geomorphologic lab. institute of geography FU BerlinGeomorphologic Lab. Institute of Geography FU Berlin 14195 Berlin Germany 14195 Berlin Germany

Through stratigraphy and chronology studies on Hongshui River section located at the southern vicinity of Tengger Desert, and based on the analysis results of TOC, TIC, elements, stable oxygen isotope that possess a h... 详细信息

关键词： Tengger Desert Holocene Paleaoclimate.

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Comparative Analysis of the Spatial-temporal Distribution and Influencing Factors of the Tourism Industry in Three Cities along Beijing-Hangzhou Grand Canal in China

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Journal of Resources and Ecology 2024年第4期15卷 1039-1053页

作者： ZHANG Shuying YU Wenting CUI Jiasheng LIU Jiaming CHAN Chung-shing Key lab.ratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Beijing institute of Graphic Communication Beijing 102600China Key lab.for Resources Use&Environmental Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Department of geography and Resource Management The Chinese University of Hong KongHong Kong 999077China

The temporal-spatial pattern of linear cultural heritage in the context of the tourism industry is closely linked to heritage *** the 1800 km long Beijing-Hangzhou Grand Canal as an example,this study compared the dynamic evolution of tourism businesses in Beijing,Liaocheng,and Yangzhou at three time points(2010,2015,and 2019)via nearest neighbor analysis,kernel density estimation,and the standard deviational ***,a Geo-detector was used to examine the influencing *** results reveal significant growth regardless of the quantity or agglomeration degree from 2010 to 2019,and the direction of industrial expansion is consistent with the flow direction of the ***,the explanatory powers of factors related to socioeconomic development and canal resources are obviously stronger than those of the natural *** findings of this study offer theoretical constructs and policy recommendations for the sustainable development of the Beijing-Hangzhou Grand Canal and other linear cultural heritage sites.

关键词： tourism industry linear cultural heritage temporal-spatial distribution Beijing-Hangzhou Grand Canal Geo-detector

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Assessment of Crop Yield in China Simulated by Thirteen Global Gridded Crop Models

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Advances in Atmospheric Sciences 2024年第3期41卷 420-434页

作者： Dezhen YIN Fang LI Yaqiong LU Xiaodong ZENG Zhongda LIN Yanqing ZHOU International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China State Key lab.ratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key lab.ratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

Global gridded crop models(GGCMs) have been broadly applied to assess the impacts of climate and environmental change and adaptation on agricultural production. China is a major grain producing country, but thus far only a few studies have assessed the performance of GGCMs in China, and these studies mainly focused on the average and interannual variability of national and regional yields. Here, a systematic national-and provincial-scale evaluation of the simulations by13 GGCMs [12 from the GGCM Intercomparison(GGCMI) project, phase 1, and CLM5-crop] of the yields of four crops(wheat, maize, rice, and soybean) in China during 1980–2009 was carried out through comparison with crop yield statistics collected from the National Bureau of Statistics of China. Results showed that GGCMI models generally underestimate the national yield of rice but overestimate it for the other three crops, while CLM5-crop can reproduce the national yields of wheat, maize, and rice well. Most GGCMs struggle to simulate the spatial patterns of crop yields. In terms of temporal variability, GGCMI models generally fail to capture the observed significant increases, but some can skillfully simulate the interannual variability. Conversely, CLM5-crop can represent the increases in wheat, maize, and rice, but works less well in simulating the interannual variability. At least one model can skillfully reproduce the temporal variability of yields in the top-10 producing provinces in China, albeit with a few exceptions. This study, for the first time, provides a complete picture of GGCM performance in China, which is important for GGCM development and understanding the reliability and uncertainty of national-and provincial-scale crop yield prediction in China.

关键词： global gridded crop model historical crop yield China multi-model evaluation

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Copper-induced formation of heterostructured Co_(3)O_(4)/CuO hollow nanospheres towards greatly enhanced lithium storage performance

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Chinese Chemical Letters 2024年第2期35卷 594-598页

作者： Junjun Zhang Huiying Lu Tianhao Yao Xin Ji Qingmiao Zhang Lingjie Meng Jianmin Feng Hongkang Wang College of geography & Environment Xianyang Normal UniversityXianyang 712000China State Key lab.of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE)School of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Chemistry Xi'an Key Laboratory of Sustainable Energy Material Chemistryand Instrumental Analysis CenterXi'an Jiaotong UniversityXi'an 710049China

We report a facile template-free fabrication of heterostructured Co_(3)O_(4)/CuO hollow nanospheres using pre-synthesized Co/Cu-glycerate as conformal *** introduction of copper nitrate in the solvothermal reaction system of glycerol/isopropanol/cobalt nitrate readily induces the conversion from solid Co-glycerate to hollow Co/Cu-glycerate nanospheres,and the effect of the Co/Cu atomic ratio on the structure evolution of the metal glycerates as well as their corresponding oxides were *** examined as anode materials for lithium-ion batteries,the well-defined Co_(3)O_(4)/CuO hollow nanospheres with Co/Cu molar ratio of 2.0 demonstrate excellent lithium storage performance,delivering a high reversible capacity of 930 mAh/g after 300 cycles at a current density of 0.5 A/g and a stable capacity of 650 mAh/g after 500 cycles even at a higher current density of 2.0 A/g,which are much better than their counterparts of bare CuO and Co_(3)O_(4).The enhanced lithium storage performance can be attributed to the synergistic effect of the CuO and Co_(3)O_(4)heterostructure with hollow spherical morphology,which greatly enhances the charge/electrolyte transfer and effectively buffers the volume changes upon lithiation/delithiation cycling.

关键词： Lithium-ion batteries Co/Cu-glycerate Hollow nanospheres Co_(3)O_(4)/CuO heterostructure Electrochemical properties

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2000-2020年中国建设用地扩张侵占耕地的时空特征及其与粮食产量的空间关系

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Journal of Geographical Sciences 2024年第5期34卷 855-870页

作者：李资华丁明军谢坤李静茹陈利文 Territorial Spatial Survey and Planning institute Department of Natural Resources of Jiangxi ProvinceNanchang 330025China Engineering Technology Innovation Center for Ecological Protection and Restoration of Land Space in the Great Lakes Basin Ministry of Natural ResourcesNanchang 330025China School of geography and Environment Jiangxi Normal UniversityNanchang 330028China Key lab.of Poyang Lake Wetland and Watershed Research of Ministry of Education and School of geography and Environment Jiangxi Normal UniversityNanchang 330028China Yuzhang Normal University Nanchang 330103China Nanjing Engineering Vocational College of Jiangsu Province Nanjing 211135China

Construction land expansion is a key driver of urbanization and industrialization,yet it poses the risk of losing farmland and cascading impacts on food *** spatial char-acteristics of farmland occupied by construction land and its association with grain yield in China were *** analyzed the characteristics of farmland converted into construction land,and its relationship with grain yield in China for *** land increased in area in central and western regions of China,and farmland decreased in area in south-eastern *** expansion of construction land in the North China Plain,Northeast China Plain,and the Loess Plateau,occurred at the expense of *** the southeast coast of China,grain yield increase was only weakly dependent on farmland *** in which farmland was converted into construction land and grain-yield change were highly coupled in southeastern coastal China,Sichuan Basin,Shandong Peninsula,and the Hu Huanyong *** should be noted that expansion in construction land area does have some influence on grain production;ultimately it is greatly affected by yield per unitarea.

关键词： construction land expansion change in farmland grain yield temporal and spatial variation Chinese counties

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The Probability Density Function Related to Shallow Cumulus Entrainment Rate and Its Influencing Factors in a Large-Eddy Simulation

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Advances in Atmospheric Sciences 2024年第1期41卷 173-187页

作者： Lei ZHU Chunsong LU Xiaoqi XU Xin HE Junjun LI Shi LUO Yuan WANG Fan WANG Collab.rative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)and Key lab.ratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science and TechnologyNanjing 210044China Nanjing Joint institute for Atmospheric Sciences Nanjing 210019China College of Aviation Meteorology Civil Aviation Flight University of ChinaGuanghan 618307China Collab.rative Innovation Center for Western Ecological Safety Lanzhou UniversityLanzhou 730000China Department of geography Hong Kong Baptist UniversityHong Kong SAR 999077China

The process of entrainment-mixing between cumulus clouds and the ambient air is important for the development of cumulus *** obtaining the entrainment rate(λ)is particularly important for its parameterization within the overall cumulus parameterization *** this study,an improved bulk-plume method is proposed by solving the equations of two conserved variables simultaneously to calculateλof cumulus clouds in a large-eddy *** results demonstrate that the improved bulk-plume method is more reliable than the traditional bulk-plume method,becauseλ,as calculated from the improved method,falls within the range ofλvalues obtained from the traditional method using different conserved *** probability density functions ofλfor all data,different times,and different heights can be well-fitted by a log-normal distribution,which supports the assumed stochastic entrainment process in previous *** analysis demonstrate that the relationship betweenλand the vertical velocity is better than other thermodynamic/dynamical properties;thus,the vertical velocity is recommended as the primary influencing factor for the parameterization ofλin the *** results of this study enhance the theoretical understanding ofλand its influencing factors and shed new light on the development ofλparameterization.

关键词： large-eddy simulation cumulus clouds entrainment rate probability density functions spatial and temporal distribution

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Detecting vehicle traffic patterns in urban environments using taxi trajectory intersection points

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Geo-Spatial Information Science 2017年第4期20卷 333-344页

作者： Andreas Keler Jukka M.Krisp Linfang Ding institute of geography University of Augsburg Augsburg Germany

Detecting and describing movement of vehicles in established transportation infrastructures is an important *** helps to predict periodical traffic patterns for optimizing traffic regulations and extending the functions of established transportation *** detection of traffic patterns consists not only of analyses of arrangement patterns of multiple vehicle trajectories,but also of the inspection of the embedded geographical *** this paper,we introduce a method for intersecting vehicle trajectories and extracting their intersection points for selected rush hours in urban *** vehicle trajectory intersection points (TIP) are frequently visited locations within urban road networks and are subsequently formed into density-connected clusters,which are then represented as *** representing temporal variations of the created polygons,we enrich these with vehicle trajectories of other times of the day and additional road network *** a case study,we test our approach on massive taxi Floating Car Data (FCD) from Shanghai and road network data from the OpenStreetMap (OSM) *** first test results show strong correlations with periodical traffic events in *** on these results,we reason out the usefulness of polygons representing frequently visited locations for analyses in urban planning and traffic engineering.

关键词： Floating Car Data (FCD) moving objects transportation infrastructure spatio-temporal patterns

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An improved algorithm of simulation on air-sea turbulent heat fluxes in China seas

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Chinese Journal of Oceanology and Limnology 2007年第3期25卷 292-299页

作者：褚健婷陈锦年夏军戴永久 Key lab. of Water Cycle & Related Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences institute of Oceanology Chinese Academy of Sciences School of geography Beijing Normal University

With a global GSSTF2 and NCEP/NCAR reanalysis database and observation data at the Yong Xing station of Xisha Island in the South China Sea, we simulated the turbulent sensible and latent heat flux at sea surface in Chinese and neighboring seas (hereafter termed as China seas) using a common bulk method with some improved parameters. Comparing the simulated results with the observed and reanalyzed data, the improvement yielded higher accuracy, a smaller mean square deviation within 10 W/m2, and a smaller average relative error at about 25%. In addition, spatial resolution was improved to 0.1°×0.1°. The simulation is able to replay the main features of regional and seasonal variation in turbulent heat fluxes, and also the general pattern of heat flux changes during the summer monsoon outbreak in the South China Sea.

关键词： sensible heat flux latent heat flux the bulk method China seas

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乌克兰卡霍夫卡大坝损毁的多维度影响评估

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Science Bulletin 2024年第11期69卷 1642-1646页

作者：陈斌安佳夫黄玉飞陈曦东吴胜标林晨宫鹏 Future Urbanity&Sustainable Environment(FUSE)lab Division of Landscape ArchitectureDepartment of ArchitectureFaculty of ArchitectureThe University of Hong KongHong Kong 999077China Department of Real Estate and Construction Faculty of ArchitectureThe University of Hong KongHong Kong 999077China Faculty of Business and Economics The University of Hong KongHong Kong 999077China Department of geography and Department of Earth SciencesThe University of Hong KongHong Kong 999077China

Water plays a central role in sustaining a thriving human society. Given its immense importance, safeguarding the related water infrastructure such as dams and reservoirs, which ensures the proper functioning of water... 详细信息

关键词：影响评估 reservoirs immense

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