检索结果-南通市图书馆

A Study on the Assessment and Integration of Multi-Source Evapotranspiration Products over the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第3期41卷 435-448页

作者： Ming cheng Lei ZHONG Yaoming MA Han MA Yaoxin CHANG Peizhen li Meilin cheng Xian wang Nan GE School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China Jiangsu Collaborative Innovation Center for Climate Change Nanjing 210023China Frontiers Science Center for Planetary Exploration and Emerging Technologies University of Science and Technology of ChinaHefei 230026China Land-Atmosphere Interaction and its Climatic Effects Group State Key Laboratory of Tibetan Plateau Earth SystemResources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China college of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China college of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and environmental Changes Dingri 858200China Kathmandu Center of Research and Education Chinese Academy of SciencesBeijing 100101China china-Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan

Evapotranspiration(ET)is a crucial variable in the terrestrial water,carbon,and energy *** present,a large number of multi source ET products *** to sparse observations,however,great challenges exist in the evaluation and integration of ET products in remote and complex areas such as the Tibetan Plateau(TP).In this paper,the applicability of the multiple collocation(MC)method over the TP is evaluated for the first time,and the uncertainty of multisource ET products(based on reanalysis,remote sensing,and land surface mo{3.ls)is further analyzed,which provi{3.s a theoretical basis for ET data *** results show that 1)ET uncertainties quantified via the MC method are lower in RS-based ET products(5.95 vs.7.06 mm month^(-1))than in LSM ET products(10.22 vs.17.97 mm month^(-1))and reanalysis ET estimates(7.27 vs.12.26 mm month-1).2)A multisource evapotranspiration(MET)dataset is generated at a monthly temporal scale with a spatial resolution of 0.25°across the TP during *** has better performance than any individual product.3.Based on the fusion product,the total ET amount over the TP and its patterns of spatiotemporal variability are clearly *** annual total ET over the entire TP is approximately 3.0.60 ***,an increasing trend of 1.59±0.85 mm yr^(-1)over the TP is shown during *** study provi{3.s a basis for future studies on water and energy cycles and water resource management over the TP and surrounding regions.

关键词： evapotranspiration data fusion multiple collocation the Tibetan Plateau

EXPERIMENT OF IMPACT OF RIVER HYDRAUliC CHARACTERISTICS ON NUTRIENTS PURIFICATION COEFFICIENT

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第3期19卷 387-393页

作者： wang Pei-fang wang Xiao-rong wang Chao State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210093 China State Key Laboratory of Hydrology-water resources and Hydraulic {3. Hohai University Nanjing 210098 China Key Laboratory of Intergrated Regulation and Resource development on Shallow Lakes College of Environmental Science and Engineering Hohai University Nanjing 210098 China

Hydraulic characteristics of a river are the key factors for river water quality improvement and river restoration. A simulated river was exploited to study the interactions between water contaminant purification coefficients and the characteristics of the river, such as the cross-section velocity, water depth, Reynolds number, and Froude number. To enhance the purification capacity of the river, detritus with 5 mm to 10 mm in diameter and contact surface area per volume of 87.6 m^2/m^3.were constructed naturally at the bed and along one side of the bank to form half shape of the river cross-section. During the one-month experiment （including 3.periods） from the third of November to the fourth of december, 2005, three categories of hydraulic conditions were investigated. Results show that the purification coefficient （K） of Total Nitrogen （TN） is closely coherent with the hydraulic retention time （T）, river length （L）, Reynolds number （Re） and Froude number （Fr）. The relationship of K and T generally agrees with the power law under the three experimental water hydraulic conditions. Based on these results, the optimal Re and Fr ranges can be obtain to serve as a guideline for ecological re-engineering design to improve river water quality and restore river ecosystem.

关键词： Hydraulic characteristics total nitrogen,purification coefficient interaction simulated river

Accurate Shortwave Radiation Simulation with a Two-Layer Aerosol Model in Xinjiang Region

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2024年第1期38卷 69-87页

作者： guan HUANG Yonghang CHEN Qiong liU Pengtao wang Qianshan HE Qing HE Shuai li Weiling SHAO Ting FAN School of Tourism&Research Institute of Human Geography Xi’an International Studies UniversityXi’an 710128 Center for Silk Road and Eurasian Civilization Studies Xi’an International Studies UniversityXi’an 710128 college of environmental Science and engineering Donghua UniversityShanghai 201620 Shanghai Meteorological Service Shanghai 200030 Shanghai Key Laboratory of Meteorology and Health Shanghai 200030 Taklimakan desert Meteorology Field Experiment Station of china Meteorological Administration Institute of Desert MeteorologyUrumqi 830002 Xinjiang Climate Centre Xinjiang Meteorological ServiceUrumqi 830002

To harness the rich solar energy resources in Xinjiang Region of Northwest china,this study tries to address the issue of lack of downward surface shortwave radiation(DSSR)observations and the need to improve the accuracy of satellite retrieval and numerical simulation of DSSR un{3.r varied sky and meteorological conditions.(1)A two-layer aerosol mo{3.l specific to Xinjiang was {3.veloped to capture the vertical distributions of aerosols based on multiple data sources including lidar,GPS sounding,ground meteorological observations,and profiles from the ECMWF reanalysis version 5(ERA5)*** results show that the ERA5/PBLH(planetary boundary layer height)and ERA5/ALH(aerosol layer height)could be used to establish the two-layer aerosol mo{3.l and characterize the vertical distribution of aerosols in Xinjiang Region.(2)Using the Santa Barbara Discrete Atmospheric Radiative Transfer(SBDART)mo{3.l,a localized inverse mo{3.l of clear-sky DSSR was *** parameter adjustment and using the optimal combination of input parameters for DSSR simulation together with the two-layer aerosol mo{3.l,the mo{3.l-simulated DSSR(DSSRSBD)un{3.r clear-sky conditions improved significantly compared to the initial results,with all fitting indices greatly improved.(3.In addition,the study {3.monstrated that the impact of the two-layer aerosol mo{3.l on DSSR was more pronounced un{3.r dust conditions than clear-sky conditions.(4)Using the localized clear-sky DSSR inversion mo{3.l and its required parameters,simulations were also conducted to capture the spatiotemporal distribution of DSSR un{3.r clear-sky conditions in Xinjiang from 2017 to *** annual average DSSR_(SBD)un{3.r clear-sky conditions in Xinjiang during 2017–2019 was 606.78 W m^(-2),while DSSR from CERES(DSSR_(CER))un{3.r the same conditions was generally higher(703.95 W m^(-2)).(5)It is found that satellite remote sensing products experienced data loss in high-altitu{3. snow areas,where numerical simulation technology could ser

关键词： downward surface shortwave radiation(DSSR) aerosol vertical distribution Clouds and the Earth’s Radiant Energy System(CERES) Santa Barbara Discrete Atmospheric Radiative Transfer(SBDART) Xinjiang

Mixing states and secondary formation processes of organic nitrogen-containing single particles in guangzhou,china

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2024年第4期138卷 62-73页

作者： lijun Yun Chunlei cheng Suxia Yang Zaihua wang Mei li Qi En Zhong liyuanMao Sulin liu Xiaoya cheng Duanying Chen Fan Yang Zhen Zhou Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollutionJinan UniversityGuangzhou 510632China guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for environmental Quality Guangzhou 510632China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy ScienceXi’an 710061China Institute for Environment and Climate Research Jinan UniversityGuangzhou 510632China guangdong Academy of Sciences Institute of Resources Utilization and Rare Earth DevelopmentGuangzhou 510650China environmental Monitoring Station of Pudong New District Shanghai 201200China

Organic nitrogen(ON)compounds play a significant role in the light absorption of brown carbon and the formation of organic aerosols,however,the mixing state,secondary formation processes,and influencing factors of ON compounds are still *** paper reports on the mixing state of ON-containing particles based on measurements obtained using a highperformance single particle aerosol mass spectrometer in January 2020 in *** ON-containing particles accounted for 21% of the total detected single particles,and the particle count and number fraction of the ON-containing particles were two times higher at night than during the *** prominent increase in the content of ON-containing particles with the enhancement of NO_xmainly occurred at night,and accompanied by high relative humidity and nitrate,which were associated with heterogeneous reactions between organics and gaseous NO_(x)and/or NO_(3.*** synchronous decreases in ON-containing particles and the mass absorption coefficient of {3.-soluble extracts at 3.5 nm in the afternoon may be associated with photo-bleaching of the ON species in the *** addition,the positive matrix factorization analysis found five factors dominated the formation processes of ON particles,and the nitrate factor(3.%)mainly contributed to the production of ON particles at *** results of this study provide unique insights into the mixing states and secondary formation processes of the ON-containing particles.

关键词： Organic nitrogen compounds Single particles Mixing state Secondary formation Nighttime chemistry

Migration of Infiltrated NH_4 and NO_3.in a Soil and Groundwater System Simulated by a Soil Tank

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2008年第5期18卷 628-637页

作者： wang Chao wang Pei-Fang State Key Laboratory of Hydrology- water resources and Hydraulic {3. Key Laboratory of Integrated Regulationand Resource Department on Shallow Lakes Ministry of Education Environmental Science and Engineering CollegeHohai University Nanjing 210098 （China）.

The infiltration of water contaminants into soil and groundwater systems can greatly affect the quality of groundwater. A laboratory-designed large soil tank with periodic and continuous infiltration models, respectively, was used to simulate the migration of the contaminants NH4 and NO3.in a soil and groundwater system, including unsaturated and saturated zones. The unsaturated soil zone had a significant effect on removing NH4 and NO3.infiltrated from the surface water. The patterns of breakthrough curves of NH4 and NO3.in the unsaturated zone were related to the infiltration time. A short infiltration time resulted in a single sharp peak in the breakthrough curve, while a long infiltration time led to a plateau curve. When NH4 and NO3.migrated from the unsaturated zone to the saturated zone, an interracial retardation was formed, resulting in an increased contaminant concentration on the interface. Under the influence of horizontal groundwater movement, the infiltrated contaminants formed a contamination-prone area downstream. As the contaminants migrated downstream, their concentrations were significantly reduced. Under the same infiltration concentration, the concentration of NO3.was greater than that of NH4 at every corresponding cross-section in the soil and groundwater tank, suggesting that the removal efficiency of NH4 was greater than that of NO3.in the soil and groundwater system.

关键词： breakthrough curve migration NH4 NO3 soil tank experiment

Theoretical insights into thermal transport and structural stability mechanisms of triaxial compressed methane hydrate

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第9期33卷 494-504页

作者： Dong-Sheng Chen Ting-Ting Miao cheng Chang Xu-Yang Guo Meng-Yan guan and Zhong-li Ji Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical andTransportation EngineeringChina University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Petroleum resources and Prospecting China University of Petroleum-BeijingBeijing 102249China

The heat transfer and stability of methane hydrate in reservoirs have a direct impact on the drilling and production efficiency of hydrate resources,especially in complex stress environments caused by formation *** this study,we investigated the thermal transport and structural stability of methane hydrate under triaxial compression using molecular dynamics *** results suggest that the thermal conductivity of methane hydrate increases with increasing compression *** phonon transport mechanisms were identified as factors enhancing thermal *** low compressive strains,a low-frequency phonon transport channel was established due to the overlap of phonon vibration peaks between methane and water *** high compressive strains,the filling of larger phonon bandgaps facilitated the opening of more phonon transport ***,we found that a strain of􀀀0.04 is a watershed point,where methane hydrate transitions from stable to ***,a strain of􀀀0.06 marks the threshold at which the diffusion capacities of methane and water molecules are at their *** a higher strain of􀀀0.08,the increased volume compression reduces the available space,limiting the diffusion ability of water and methane molecules within the *** synergistic effect of the strong diffusion ability and high probability of collision between atoms increases the thermal conductivity of hydrates during the unstable period compared to the stable *** findings offer valuable theoretical insights into the thermal conductivity and stability of methane hydrates in reservoir stress environments.

关键词： methane hydrate molecular dynamics thermal transport triaxial compression structural stability

Mesoporous amorphous FeOOH-encapsulated BiO_(2–x) photocatalyst with harnessing broad spectrum toward activation of persulfate for tetracycline degradation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical engineering 2024年第7期71卷 235-248页

作者： Pengfei Wu Zhaolong liu li Wu Yingkun Zhang Bing wang Zhanghao {3. Wenquan Cui Xiangyang Lv Qingling liu Tianjin Key Laboratory of Indoor Air environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300350China Hebei Pollution Control Technology Innovation Center of Steel and Coking Industry Department of Environmental and Chemical EngineeringHebei College of Industry and TechnologyShijiazhuang 050091China Hebei Key Laboratory of environmental Photocatalytic and Electrocatalytic Materials College of Chemical EngineeringNorth China University of Science and TechnologyTangshan 063210China Hebei Academy of Product Quality Supervision&Inspection Shijiazhuang 050227China

With the growing concern about the water environment,the advanced oxidation process of persulfate activation assisted by photocatalysis has attracted considerable attention to decompose dissolved organic *** this work,to overcome the drawbacks of the photocatalytic activity reduction caused by the photo-corrosion of non-stoichiometric BiO_(2–x),a novel material with amorphous FeOOH in situ grown on layered BiO_(2–x) to form a core-shell structure similar to popcorn chicken-{3.ke morphology was produced in two simple and environmentally beneficial *** a series of degradation activity tests of hybrid materials under different conditions,the as-prepared materials exhibited remarkable degradation activity and stabi{3.ty toward tetracyc{3.ne in the FeOOH@BiO_(2–x)/Vis/PS system due to the synergism of photocatalysis and persulfate *** results of XRD,SEM,TEM,XPS,FTIR,and BET show that the loading of FeOOH increases the specific surface area and active sites appreciably;the heterogeneous structure formed by FeOOH and BiO_(2–x) is more favorable to the effective separation of photogenerated *** optimal degradation conditions were at a catalyst addition of 0.7 g·L^(–1),a persulfate concentration of 1.0 g·L^(–1),and an initial pH of 4.5,at which the degradation rate could reach 94.7%after 90 *** influence of typical inorganic anions on degradation was also *** studies and radical quenching experiments revealed that·OH,SO_(4)^(-)·,and·O_(2)^(-)were the principal active species generated during the degradation of *** results of the 1,10-phenanthro{3.ne approach proved that the effect of dissolved iron ions on the tetracyc{3.ne degradation was {3.mited,and the interfacial reaction that occurs on the active sites on the material's surface was a critical *** work provides a novel method for producing efficient broad-spectrum Bismuth-based composite photocatalysts and photocatalytic-activated persulfate synerg

关键词： Amorphous FeOOH BiO_(2–x) Activated persulfate Photocatalytic Tetracycline degradation

Comprehensive understanding on sources of high levels of fine particulate nitro-aromatic compounds at a coastal rural area in northern china

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2024年第1期135卷 483-494页

作者： Yueru Jiang Xinfeng wang Min li Yiheng liang Zhiyi liu Jing Chen Tianyi guan Jiangshan Mu Yujiao Zhu He Meng Yang Zhou Lan Yao likun Xue Wenxing wang Environment Research Institute Shandong UniversityQingdao 266237China department of environmental Systems Science Swiss Federal Institute of Technology ZurichZurich 8092Switzerland department of water resources and Drinking water Swiss Federal Institute of Aquatic Science and TechnologyDuebendorf 8600Switzerland Qingdao Eco-Environment Monitoring Center of Shandong Province Qingdao 266003China college of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China School of environmental and Geographical Sciences Shanghai Normal UniversityShanghai 200234China

Nitro-aromatic compounds(NACs)are among the major components of brown carbon(BrC)in the atmosphere,causing negative impacts on regional climate,air quality,and ecological *** to the extensive origins,it is still a challenge to figure out the contributions and originating regions for different sources of atmospheric ***,field observations on fine particulate NACs were conducted at a coastal rural area in Qingdao,china in the winter of 2018 and *** mean total concentrations of fine particulate nitro-aromatic compounds were 125.0±89.5 and 27.7±21.1 ng/m^(3.in the winter of 2018 and 2019,*** the measured eleven NACs,nitrophenols and nitrocatechols were the most abundant *** characteristics and correlation analysis showed that humidity and anthropogenic primary emissions had significant influences on the NAC *** this study,two tracing methods of the improved spatial concentration weighted trajectory(SCWT)mo{3.l and the receptor mo{3.l of positive matrix factorization(PMF)were combined to comprehensively un{3.rstand the origins of NACs in fine particles at coastal *** major sources were i{3.ntified,including coal combustion,biomass burning,vehicle exhaust,and secondary ***,coal combustion was responsible for about half of the observed nitro-aromatic compounds,followed by biomass burning(~3.%).The results by SCWT {3.monstrated that the coal combustion dominated NACs mainly originated from the Shandong peninsula and the areas to the north and southwest,while those dominated by biomass burning primarily came from local Qingdao and the areas to the west.

关键词： Nitro-aromatic compounds Fine particles Source apportionment Originating region Combustion activities

FINE SILT PARTICLE PATHliNE OF DREDGING SEDIMENT IN THE YANGTZE RIVER deEPwater NAVIGATION CHANNEL BASED ON EFDC MOdeL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第6期22卷 760-772页

作者： XIE Rui WU de-an YAN Yi-xin ZHOU Hai college of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 China Shanghai Institute of waterways Shanghai 200120 China

Based on the environmental Fluid Dynamics Code （EFDC）, a three-dimensional baroclinic model for lower reaches of the Yangtze River, Yangtze River Estuary, Hangzhou Bay and the adjacent sea areas was established with the sigma-coordinate in the vertical direction and the orthogonal curvilinear coordinates in the horizontal direction. The fine silt particle tracers were injected during different tides with the calibrated three-dimensional numerical model in the Yangtze River Estuary to simulate the migration tracks of the tracers in the following three days, and thereby study the migration behavior of the fine silt particles of dredged sediment after dumping at different locations in the navigation channel in the Yangtze River Estuary. The study shows that the particle paths of the tracer particles basically migrate to the open sea along the middle axis of river course in the form of reciprocating oscillation, the migration and diffusion directions of tracer particles are basically parallel to the navigation channel in guide levee, similar to long belt distribution, and the tracer particles migrate to the southeast out of the guide levee. The particle which is on the southern and northern sides enter groin and cross the navigation channel in the process of movement, and is easy to deposit in the navigation channel. The migration tracks of the particles released at different layers are basically similar at the same release station, but specifically different, varying at different cross sections. The result can be used for the choice and evaluation of dredging schemes in the Yangtze River deepwater Navigation Channel.

关键词： deepwater channel EFDC model tracer fine silt particles