检索结果-南通市图书馆

Impacts on surface ozone by black carbon and boundary layer interaction in Nanjing,China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impacts on surface ozone by black carbon and boundary layer ...

第十五届海峡两岸气胶技术研讨会

作者： Bin Zhu Jinhui Gao Hanqing Kang Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science & Technology Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology

black carbon(BC) is an important solar-radiation absorbing aerosol in *** impacts of BC on surface ozone via influencing the photolysis rates have been found in previous *** BC-boundary layer(BL) interactions also influence the surface *** simulation conducted by the online model system(WRF-Chem),changes of surface ozone caused by BC-BL interactions are demonstrated in Nanjing city in this *** of the absorption of incident solar radiation induced by BC,the air above BL was heated and then BL development was *** weakened turbulence entrained less ozone from ozone-rich air above BL down to ***,with the BL depression,more ozone precursors(***) were confined in lower BL which made the chemical process supply more ozone at the ground level before *** a result,surface ozone reduced before noon with the maximum reduction of 16.4 ppb,suggesting that the vertical mixing process played the most import role in influencing the surface *** the afternoon,since the delay of BL development,the ozone is not mixed well in vertical and larger O-gradient existed at the top of *** concentration of ozone aloft can be entrained down to the surface offsetting the surface ozone *** implementing the ozone tagging method into WRF-Chem,we found that ozone from Jiangsu(JS),Anhui(AH) and outside the model domain(O-INFLOW) decreased by about 2-4.5 ppb through BC-BL *** the contrary,since the delayed development of BL,more ozone contribution from North China Plain(NCP)(5.6-11.2 ppb) in/above upper BL was entrained down and enhanced surface ozone in Nanjing in the afternoon.

关键词： black carbon boundary layer interaction surface ozone source apportionment

Shipborne observations of atmospheric black carbon aerosol particles during the Seventh Chinese Arctic Research Expedition

在线全文

cnki会议

学校读者我要写书评

暂无评论

Shipborne observations of atmospheric black carbon aerosol p...

第34届中国气象学会年会

作者： Tian Biao Ding Minghu Sun Weijun Tang Jie Wang Yetang Zhang Tong Xiao Cunde Zhang Dongqi College of Geography and Environment Shandong Normal University Meteorological Observation Center China Meteorological Administration

From July to September in 2016, during the 7th Arctic scientific expedition in China, we observed the black carbon aerosol concentration over the route. The sailing latitude range from 31.31 ° N to 82.88 ° N. The results show that the average concentration of black carbon in the Arctic Ocean is 27.29 ng.m-3. However, compared to the previous Arctic expedition, in this expedition, the black carbon aerosol concentration of the Arctic Ocean is high. The impact of terrestrial transport was analyzed by using HYSPLIT model and the MODIS AOD remote sensing. In the special section, there are significant differences in the concentration of black carbon aerosol from the departing and return, and there are significant differences in the source of air mass trajectories. Land source transport is a key factor affecting the concentration of black carbon aerosol over the ocean.

关键词： black carbon aerial survey the air mass back trajectories MODIS AOD

Stable carbon isotope of black carbon in lake sediments as an indicator of terrestrial environmental changes:An evaluation on paleorecord from Daihai Lake,Inner Mongolia,China

在线全文

cnki会议

学校读者我要写书评

暂无评论

Stable carbon isotope of black carbon in lake sediments as a...

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Xu Wang Linlin Cui Jule Xiao Zhongli Ding Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of Sciences

We measured the carbon isotope ratio of black carbon(BC) from the Daihai Lake sediment core(DH99a) in north-central China with an objective to examine the effectiveness and sensitivity of theδC values of BC (δC) as a potential indicator of terrestrial environmental *** first performed a statistical study on the available data regarding carbon isotope fractionation(CIF) during the conversion of C3 and C4 vegetation to BC and observed that the mean CIF for BC produced from C3 plants is - 0.3‰,whereas that for BC from C4 plants is—1.7‰.This result provides a solid reference for reconstructing vegetation and environmental changes using theδC ***δC record in the DH99a sediment core spanning the last ca 10,000 years displayed large variations from—23.7‰to—29.2‰,which suggests that C3 plants dominantly occupied the Daihai Lake region during the *** most negativeδC peaks coincided with high values of tree percentages and grain sizes,which occurred under relatively wetter climatic conditions during the middle Holocene(ca 6500-3200 *** BP) and an interval between 1700 and 1350 *** *** contrast,the least negativeδC values corresponded to low values of tree percentages and grain sizes during relatively drier phases of the early and late *** generally negative correlation of theδC values with the tree percentages and grain sizes was thought to reflect a negative correlation of theδC values with the monsoon *** correlation is consistent with the response of carbon isotope in modern C3 plants to precipitation in north ***,we developed a computational model to reconstruct the changes in annual precipitation over the Daihai Lake region using theδC *** results indicated that the annual precipitation was highly variable,ranging from 170 mm lower to 310 mm higher than that at present during the middle Holocene,whereas the annual precipitation was generally -70 mm lower than that at present during the early and la

关键词： Lake sediments black carbon carbon isotope Monsoon precipitation Daihai Lake

Impacts of Himalayas on black carbon over the Tibetan Plateau during summer monsoon

在线全文

cnki会议

学校读者我要写书评

暂无评论

Impacts of Himalayas on black carbon over the Tibetan Platea...

第十五届海峡两岸气胶技术研讨会

作者： Shuyu Zhao Xuexi Tie Xin Long Junji Cao KLACP SKLLQGInstitute of Earth EnvironmentChinese Academy of Sciences Center for Excellence in Urban Atmospheric Environment Institute of Urban EnvironmentChinese Academy of Sciences Shanghai Key Laboratory of Meteorology and Health National Center for Atmospheric Research Department of Environmental Science Xi'an Jiaotong University

The Tibetan Plateau（TP） plays important roles in global climate and *** study combines in-situ BC measurements in the Himalayas and the Indo-Gangetic Plain（IGP） with a regional dynamical and chemical model（WRF-Chem model） to investigate the effect of the trans-Himalayas on black carbon（BC） from the IGP to the TP during Indian summer *** order to determine the topographic effects of the trans-Himalayas on BC concentrations over the TP,two sensitive experiments were conducted by applying the WRF-Chem *** results showed that the reduction of the altitude of the Himalayas had an important effect on the trans-Himalayas transport of BC *** was an obvious increase in BC concentration over the trans-Himalayas region,but no significant increase over the TP because the TP with an average elevation above 4 km always acted as a wall to prevent BC transport from the IGP to the *** trans-Himalayas transport of BC was strongly dependent upon the meteorological conditions over the *** Indian summer monsoon,there were three types of cyclones at different locations and one kind of convergent circulation in the *** the condition of convergent airflows,a strong northeastward wind produced the trans-Himalayas transport of *** a result,BC concentrations in the southeastern TP significantly increased and reached to 0.6-0.8 μg *** the cyclone located in the eastern IGP,high BC concentrations over the IGP were transported along the foothill of the Himalayas,resulting in a significant reduction of the trans-Himalayas *** the cyclone moved to the west,the dynamical perturbations for the trans-Himalayas transport were weaker than the eastern cyclone,and the trans-Himalayas transport were enhanced in the middle and eastern *** study provides some useful information for understanding the effects of Himalayas on BC transport from the IGP to the TP,and it is helpful to assess the impacts of BC particles emitted from

关键词： black carbon monsoon the Himalayas and Tibetan Plateau WRF-Chem model

Methods Development for the Optical Determination of the black carbon Content of Loess Samples

在线全文

cnki会议

学校读者我要写书评

暂无评论

Methods Development for the Optical Determination of the Bla...

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Yan Mu Xiaoguang Qin Jiaqi Liu Zhiqiang Yin Institute of Geology and Geophysics Chinese Academy of Sciences China Institute of Geo-Environment Monitoring

We evaluate the applicability of an optical transmission measurement method commonly used for the analysis of the black carbon(BC) content of aerosol sample,to determine the BC content of loess sediments.A number of different sample pretreatment procedures are developed and compared,leading to an optimum preparation *** results include:1) Subtraction of the optical attenuation values before and after heating of the sample filters( "ΔATN") varies linearly with the sample *** slope of the regression line provides the best determination of BC concentration.2) When the sample mass is small,(NaPO)6 pretreatment is best for BC measurement,and the BC concentration results are given by the slope of the regression between ΔATN and sample mass,for a series of samples of varying mass.3) HF pretreatment accompanied by centrifugation and rinsing may produce a negative bias on the result.4) Replicate measurements of BC for loess samples showed a maximum deviation less than 5.6%,suggesting that measurements of the BC concentration of a sequence of loess samples could determine variations to this degree of significance.5) The overall trends of BC concentration in loess section sequences were similar for all chemical *** BC concentration result for replicate samples is comparable when pretreated by the same procedure.

关键词： black carbon Optical Measurement Method Loess Section Pretreatment Procedure

Characteristics of indoor and outdoor black carbon aerosol during winter and summer in rural area of Guanzhong Plain

在线全文

cnki会议

学校读者我要写书评

暂无评论

Characteristics of indoor and outdoor black carbon aerosol d...

第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会

作者： Zhu Chongshu1,2 Cao Junji1,Shen Zhen Xing3,Liu Sui Xin1,2(1.State Key Lab of Loess & Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an,Shanxi 710075,China 2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China 3.Department of Environmental Science and Engineering,Xi’an Jiaotong University,Xi’an,China.)

black carbon（BC） were measured continuously in rural area of Guanzhong Plain during winter and *** concentrations of BC varied acutely over a range of 3.9-25.6 μg m-3 for outdoor and 4.8-24.7 μg m-3 for indoor in daily mean concentration,with the overall average values of 14.6 μg m-3 and 14.4 μg m-3 for outdoor and indoor in winter,*** mean BC concentrations varied over a range of 2.9-9.9μg m-3 for outdoor and 4.7-10.2μg m-3 for indoor,with the overall average value of 6.0 μg m-3 and 7.2 μg m-3 for outdoor and indoor,respectively in *** results shows the concentrations of black carbon is high in the rural area,especially in winter,which is probably due to the local biomass burning for warming and *** rural area of Guanzhong Plain,Obviously diurnal variation of BC was observed,with the hourly average concentrations ascending to its peaks twice a day in the morning and at the *** frequency distributions of BC concentrations in both indoor and outdoor environments showed a similar *** indoor environment,it was found that the BC concentrations were distributed over the high spectrum of concentrations than that for outdoor *** relationships between indoor and outdoor concentrations（separately for LT,WN and HX sites） of BC were discussed,which showed a good correlation between indoor and outdoor air of the three *** results suggest that indoor black carbon was derived at least in part from outdoor air.

关键词： black carbon rural area Guanzhong Plain

Impacts of Different Land Reclamation Methods on Organic carbon and black carbon in Soil in a Mine Subsided Area

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2017年第2期8卷 191-195页

作者：曹玉红李露露刘崇刚安徽师范大学环境科学与工程学院安徽芜湖241003

In this paper, changes in the amounts of organic carbon and black carbon in reclaimed soil were studied. The subsidence area was in a Xuzhou coal mining area that is part of a national land reclamation demonstration area. The significance of the paper is to explain the law of quality changes of reclaimed soil, improve the soil reclamation process and promote the sustainable use of soil in mining areas. In the study, four kinds of soils were collected using four land reclamation methods： coal gangue filling（CGF）, mixed flat reclamation（MFR）, mud pump filling（MPF） and fly ash filling（FAF）; soil from the subsided area（SS） was used as the control. Organic carbon and black carbon on content were determined by elemental analysis, potassium dichromate titration and other methods. The result shows that reclamation methods do have an influence on the organic carbon and black carbon content in subsidence soil. The content of organic carbon and black carbon at different soil depths varies the most in FAF. Regression analysis of black carbon and organic carbon contents from the four different reclamation methods show that the levels are significant in all cases. Therefore, there is no obvious relationship between the proportion of black carbon and the accumulation of organic carbon in the study area.

关键词： land reclamation methods mine subsided area organic carbon black carbon soil

Erratum to:Radiative Forcing and Climate Response Due to black carbon in Snow and Ice

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2012年第3期29卷 646-646页

作者：王志立张华沈学顺 Center for Atmosphere Watch and Services Chinese Acadcmy of Meteorological SciencesChina Meteorlogical Administration Graduate University of Chinese Academy of Sciences National Climate Center China Meteorological Administration State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

In the original version of this article, wrong statistics in the column "Surface radiative forcing (Wm~(-2))" were provided. The correct Table 1 is shown below.

关键词： Erratum Radiative Forcing and Climate Response black carbon Snow and Ice

Competitive sorption between 17α-ethinyl estradiol and bisphenol A/4-n-nonylphenol by soils

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第6期25卷 1154-1163页

作者： Jianzhong Li Lu Jiang Xi Xiang Shuang Xu Rou Wen Xiang Liu School of Environment Tsinghua University

The sorption of 17α-ethinyl estradiol （EE2）, bisphenol A （BPA）, and 4-n-nonylphenol （NP） in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils. Results showed that all sorption isotherms were nonlinear and fit the Freundlich model. The degree of nonlinearity was in the order BPA （0.537-0.686）〉 EE2 （0.705-0.858）〉 NP （0.875-0.0.951） in single systems. The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam, Silt Loam and Silt increased from 0.758, 0.705 and 0.858, to 0.889, 0.910 and 0.969, respectively, when BPA concentration increased from 0 to 1000 μg/L, but the effect of NP was comparably minimal. Additionally, EE2 significantly suppressed the sorption of BPA, but insignificantly suppressed that of NE These findings can be attributed to the difference of sorption affinity of EE2, NP and BPA on the hard carbon （e.g., black carbon） of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals （EDCs）. Competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes.

关键词： competitive sorption 17α-ethinyl estradiol endocrine-disrupting chemicals distributed reactivity model black carbon