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Quantifying the response of surface urban heat island to urbanization using the annual temperature cycle model

Geoscience Frontiers 2022年第1期13卷 478-487页

作者： Huidong Li Yuyu Zhou Gensuo Jia Kaiguang Zhao Jinwei Dong Department of Geological and Atmospheric Sciences Iowa State UniversityAmes 50011USA Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Ohio Agricultural Research and Development Center School of Environment and Natural ResourcesThe Ohio State UniversityWoosterOH 44691USA Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101

Urban heat island(UHI),driving by urbanization,plays an important role in urban sustainability under climate ***,the quantification of UHI’s response to urbanization is still challenging due to the lack of robust and continuous temperature and urbanization datasets and reliable quantification *** study proposed a framework to quantify the response of surface UHI(SUHI)to urban expansion using the annual temperate cycle *** built a continuous annual SUHI series at the buffer level from 2003 to 2018 in the Jing-Jin-Ji region of China using MODIS land surface temperature and imperviousness derived from *** then investigated the spatiotemporal dynamic of SUHI under urban expansion and examined the underlying ***,the largest SUHI interannual variations occurred in suburban areas compared to the urban center and rural ***,the increase in SUHI under urban expansion was more significant in daytime compare to *** found that the seasonal variation of SUHI was largely affected by the seasonal variations of vegetation in rural areas and the interannual variation was mainly attributed to urban expansion in urban ***,urban greening led to the decrease in summer daytime SHUI in central urban *** findings deepen the understanding of the long-term spatiotemporal dynamic of UHI and the quantitative relationship between UHI and urban expansion,providing a scientific basis for prediction and mitigation of UHI.

关键词： Urban heat island Urbanization Spatiotemporal dynamics Annual temperature cycle model Diurnal temperature range

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Climate Regulates the Effect of Abrupt Vegetation Shifts on Soil Moisture on the Loess Plateau, China

SSRN

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SSRN 2024年

作者： Xiao, Guoan Xin, Liangjie Wang, Xue Li, Xiubin Tan, Minghong Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Science Beijing China College of Resources and Environment University of Chinese Academy of Sciences Beijing China

Abrupt vegetation shifts indicate the occurrence of sudden and significant changes in ecosystem structure and function. However, it has not yet been clarified whether abrupt vegetation shifts exacerbate soil moisture deficits. In the context of revegetation on the Loess Plateau is approaching sustainable water resource limits, knowing the mechanisms and characteristics of this impact is vital for ecological restoration and water resource management. Here, we used the multi-period difference-in-differences method to find that positive abrupt vegetation shifts prevailed (29% for grasslands and 25% for forests) on the Chinese Loess Plateau from 2000 to 2020. Most of the positive abrupt grassland shifts (89%) favored soil moisture accumulation, whereas positive abrupt forest shifts had positive (51%) impacts on soil moisture in "hot zones" (characterized by higher temperatures and higher solar radiation) but negative impacts (47%) in "wet zones" (characterized as cloudy and rainy). The results show that a full understanding of how abrupt vegetation shifts affect soil moisture is critical for managing ecosystem sustainability. © 2024, The Authors. All rights reserved.

关键词： Vegetation

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Disciplinary structure and development strategy of human geography in China

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Journal of Geographical Sciences 2022年第9期32卷 1654-1669页

作者： FAN Jie ZHAO Pengjun ZHOU Shangyi DENG Xiangzheng WANG Chen Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China College of Urban and Environmental Sciences Peking UniversityBeijing100871China Key Laboratory of Earth Surface System and Human-Erath Relations Ministry of Natural Resources of ChinaShenzhenGuangdong518055China Faculty of Geographical Science Beijing Normal UniversityBeijing100875China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China School of Earth Sciences Zhejiang UniversityHangzhou310027China

Human geography is a discipline that studies the formation and evolution of the geographical distribution pattern of human *** main research objects of human geography focus on human activities and human-environment *** scientific questions to be answered by human geography cover both natural science and social science,and thus it has distinctive interdisciplinary *** China,human activities’economic and social processes play an essential role in explaining the law in human geography discipline as human society development is approaching or has entered the post-industrialization *** logic and methods of social science have become important tools through which human geography’s changes in processes and patterns of human geography can be reasonably discussed and adequately *** research methodology of human geography shows integration characteristics between natural sciences and social *** outcomes of human geography research reveal scientific laws in geographical distribution patterns and the evolution of human *** becomes one of the primary disciplines for both the national and local governments to manage and optimize spatial development and protection *** has wide applications in spatial planning,regional strategy and policy-making,and the modernization of spatial *** unique feature in integrating academic research and policy-making applications provides human geography discipline in China a superiority of leading the world in the *** integrated human geography,human geography in China has five subdisciplines:economic geography,urban geography,rural geography,socio-cultural geography and political *** subdiscipline has priority and critical research fields and coordinates with the rest of the subdisciplines.

关键词： human geography economic geography urban and rural geography socio-cultural geography political geography

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Risk assessment of typhoon storm surge based on a simulated annealing algorithm and the least squares method: a case study in Guangdong Province, China

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Natural Hazards Research 2022年第3期2卷 249-258页

作者： Guo, Tengjiao Li, Guosheng He, Lei National Science Library Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China School of Tourism and Urban Management Jiangxi University of Finance and Economics Nanchang 330013 China

Under global warming, the risk level of storm surge disasters in coastal areas has substantially increased. Guangdong Province is among the provinces most affected by typhoon storm surges in China. The typhoon risk characteristics of this region play an important role in regional development and disaster prevention and mitigation. Based on the theory of disaster risk, this study constructs a risk assessment model based on the regional characteristics of Guangdong Province and an indicator system selected in previous work. It optimizes the model using a simulated annealing algorithm and the least squares method. The optimization model was used to assess the hazard, vulnerability, disaster resilience, and risk capability of cities in Guangdong Province from 2001 to 2014. The results indicate that the hazard is related to the typhoon landing area for a single typhoon storm surge disaster. The hazard in the typhoon landing areas is undoubtedly higher than in the regions far away from the typhoon, but their risk capability is not proportional to the risk level. For many years of average typhoon storm surge disasters, cities' hazard, vulnerability, and risk capability levels have increased from inland to coastal areas. The level of resilience is not related to the location but to the city's development indicators. Zhanjiang city has the highest risk level. © 2022 National Institute of Natural Hazards, Ministry of Emergency Management of China

关键词： Guangdong Province Least squares Risk assessment Simulated annealing algorithm Typhoon storm surge

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Desertification sensitivity and its impacts on land use change in the Tarim Basin, Northwest China

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Science of the Total Environment 2024年 957卷 177601页

作者： Li, Dajing Zhu, Zaichun Xu, Erqi Zhang, Hongqi School of Urban Planning and Design Shenzhen Graduate School Peking University Shenzhen China Key Laboratory of Earth Surface System and Human–Earth Relations Ministry of Natural Resources of China Shenzhen Graduate School Peking University Shenzhen China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China

Desertification poses a major challenge in the northwestern arid areas of China. Land use activities are increasingly endangered by desertification, including direct impact (e.g., farmland abandonment) and indirect impact (e.g., farmland area control). However, previous studies have primarily focused on the impact of land use on desertification processes, while there has been limited research on the direct and indirect impacts of desertification on land use. Based on the Mediterranean Desertification and Land Use (MEDALUS) and Future Land Use simulation (FLUS) models, we identify the spatiotemporal distribution of desertification sensitivity and analyze the direct and indirect impacts of desertification on land use in the Tarim Basin from 2000 to 2020. The results showed that the desertification sensitivity areas were primarily concentrated in the critical areas (proportion > 50 %), followed by the fragile and potential areas. In terms of the direct impact, the areas of abandoned farmland due to desertification were 68.25 km2 and 1444.25 km2 during the periods of 2000–2010 and 2010–2020, respectively. Additionally, 3893.25 km2 of farmland was at risk of abandonment. After being abandoned, the farmland was primarily converted into grassland. In terms of the indirect impact, the differences between predicted (simulations without farmland area control) and observed farmland area, serving as an indicator of farmland area control to reduce desertification risks, were 1065.75 km2 in 2010 and 4614.00 km2 in 2020. Our paper provides new insights into the direct and indirect impacts of desertification on land use, providing references for formulating desertification control policies and regional land use planning. © 2024

关键词： Desertification Farmland abandonment Farmland area Land use change Tarim Basin

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Rice use history in Southeast China:Phytolith evidence from the Nanshan site in Fujian Province

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Science China Earth Sciences 2023年第5期66卷 1108-1119页

作者： Qiuhe CHEN Zhao LI Yongchao MA Zhenyu ZHOU Xiaoyan YANG Officers College of PAP ChinaChengdu610000China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China Department of History Jinan UniversityGuangzhou510632China School of Archaeology and Museology Sichuan UniversityChengdu610065China Center for Archaeological Science Sichuan UniversityChengdu610065China National Demonstration Center for Experimental Archaeology Education Sichuan UniversityChengdu610065China Institute of Archaeology Chinese Academy of Social SciencesBeijing100710China Key Laboratory of Western China’s Environmental Systems Ministry of EducationCollege of Earth and Environmental SciencesLanzhou UniversityLanzhou730000China

The southern spread of rice agriculture is of great academic *** it already has a broad chronological framework,newly introduced rice use and its impact on local subsistence and ecological systems are still *** this study,we explore these issues by analysing phytoliths recovered from continuous sediments of Cave No.4 at the Nanshan site in Fujian Province,together with evidence from surrounding *** results show that rice was introduced into southeast China at 7,500 *** BP,but the dominance of the hunting-gathering system was not challenged until later,between 5,000 and 3,500 *** BP,when cultivation of rice,together with foxtail and broomcorn millets,was widely practiced in the *** suggests that mixed farming in Southeast China,likely originating around the middle Yangtze River,became widespread and gradually systematic during the previous two-millennium *** rice-millet mixed agricultural system changed the former hunting-gathering subsistence system,promoting the agriculturalization process,cultural prosperity and population growth,thus providing a solid basis for rice expansion and cultural migration to Southeast Asia.

关键词： Phytolith analysis Southward spread of rice agriculture Subsistence system China-Indo-China-Indo-China Peninsula Island Southeast Asia

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Gridded reconstruction of the population in the traditional cultivated region of China from 1776 to 1953

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Science China Earth Sciences 2022年第2期65卷 365-378页

作者： Xuezhen ZHANG Fahao WANG Weidong LU Shicheng LI Jingyun ZHENG Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Faculty of Geographic Sciences Beijing Normal UniversityBeijing 100875China Center for Historical Geographical Studies Fudan UniversityShanghai 200433China Department of Land Resource Management School of Public AdministrationChina University of GeosciencesWuhan 430074China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Using modern census and environmental factor data,this study first identified the environmental factors that significantly affect the population distribution through Geodetector analysis and then constructed a population spatial distribution model based on the random forest regression ***,with this model and historical population data that were examined and corrected by historians,gridded population distributions with a spatial resolution of 10 km by 10 km in the traditional cultivated region of China(TCRC,hereafter)were reconstructed for six time slices from 1776 to *** the reconstruction dataset,the spatiotemporal characteristics of the population distribution were *** results showed that(1)the environmental factors that significantly affected the population density differences among counties in the TCRC mainly consisted of elevation,slope,relief amplitude,distances to the nearest prefectural and provincial capitals,distance to the nearest river and the climatology moisture index.(2)Using the census data of 1934 counties in the TCRC in 2000 and the abovementioned environmental factor data,a random forest regression algorithm-based population spatial distribution model was *** determination coefficient(R^(2))is *** 88.4%of the counties(districts),the relative errors of the model predictions were less than 50%.(3)From 1776 to 1953,the total population in the study area showed an *** to 1851,the population increased mainly in the Yangtze River *** this period,the number of grid cells in which the population densities were greater than 500 persons per km^(2) increased from 292 to *** 1851 to 1953,the population increased extensively across the study *** the North China Plain and the Pearl River Delta,the number of grid cells in which the population densities were greater than 500 persons per km^(2) increased from 36 to 88 and from 4 to 35,*** spatial clustering pattern of the popula

关键词： Population Traditional cultivated region of China(TCRC) Historical periods Gridded reconstruction

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理解青藏高原三江源地区放牧压力的空间异质性

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Journal of Geographical Sciences 2023年第8期33卷 1660-1680页

作者：谷昌军刘林山张镱锂魏博崔伯豪宫殿清 Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China National Disaster Reduction Center of China Ministry of Emergency ManagementBeijing 100124China

Elucidating the distribution of the grazing pressure requires an understanding of the grazing *** this study,we analyzed the grazing behavior of yaks in Three-RiverSource Region(TRSR)and identified the main factors influencing the distribution of grazing intensity(GI)using trajectory data and remote sensing *** results revealed that a semi-resident transhumance strategy is employed in this *** average grazing time(GT)of four GPS collars over the year was 11.84 h/day(N6),11.01 h/day(N11),9.25 h/day(N18),and 11.61 h/day(N24).GT was generally higher in warm seasons(summer and autumn)than in cold seasons(spring and winter).The average daily moving speed was found to be closely related to the pasture size of different herders and the *** analysis identified the distance to camp(DOC)as the most important single factor influencing the distribution of GI,explaining up to 52% of the GI ***,relying solely on this factor may not accurately depict the actual GI *** pairwise factors interacted,the explanatory power of the model increased,ranging from 34.55% to 63.26%.Our study highlights the importance of considering multiple factors when predicting grazing intensity,as grazing activities tend to cluster near settlements,but other factors may also be influential.

关键词： grazing intensity GPS-tracking spatial heterogeneity yak Tibetan Plateau

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The Challenge of Robust Peaking of Agricultural Non-Co2 GHG Emissions

SSRN

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SSRN 2024年

作者： Yu, Shuang Zhang, Xueyan Ma, Xin Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS Beijing100101 China Institute of Environment and Sustainable Development for Agriculture Chinese Academy of Agricultural Sciences Beijing100081 China

Agricultural mitigation is crucial for China’s "3060" carbon peak and carbon neutrality goals. However, the robust peaking of agricultural non-CO2 GHG emissions has been overlooked. This study examines Chengdu as a case study to identify obstacles in the process of agrarian nonCO2 GHG peaking in China. The results show that rapid urbanization and changes in crop structure have driven a long-term decline in agricultural non-CO2 GHG emissions, with a turning point identified as early as 1995. However, interference from administrative division adjustments and emergencies in 2016 and 2019 prevented robust non-CO2 GHG peaking in Chengdu. This highlights the need for at least five years to confirm a strong peak, as unforeseen events and policy adjustments can cause significant fluctuations. This study offers new perspectives and case evidence to forecast the trajectory of agricultural non-CO2 GHG emissions in China, informing decision-making in mitigation efforts within the agriculture sector. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Insights of carbon reduction practices from Winter Olympics 2022

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Science Bulletin 2024年第13期69卷 2034-2037页

作者： Xiaoyong Liao Shuai Zhong Jie Huang Zhu Liu Ayman Elshkaki You Li Lei Shen Yingli He Li An Yidong Zhu Wenhao Sun Tao Liang Jiaoe Wang Jinwei Dong Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory for Resources Use and Environmental Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory 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 Department of Earth System Science Tsinghua UniversityBeijing 100084China

Concerns about the carbon emissions of mega-events revolve,mainly due to the impactful demonstration effects they ***,accurate monitoring of these emissions is crucial during such events[1].The Olympic and Paralympic Winter Games Beijing 2022(hereinafter“Winter Olympics 2022”)are recognized as the first Games to pay close attention to a wide range of emissions associated with all stages of the *** of emerging carbon reduction technologies,such as low-carbon materials and technologies,have shown promising effects on efforts to achieve carbon neutrality[2].The impacts of individual measures,such as Olympic infrastructure construction.

关键词： Winter emissions carbon

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