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| 1 | aunalysis of the Genome Sequence of the Medicinal Plant Salvia miltiorrhiza显示文摘 | Haibin Xu Jingyuan Song Hongmei Luo Yujun Zhang Qiushi Li Yingjie Zhu Jiang Xu Ying Li Chi Song Bo Wang Wei Sun Guoan Shen Xin Zhang Jun Qian Aijia Ji Zhichao Xu Xiang Luo Liu He Chuyuan Li Chao Sun Haixia Yah Guanghong Cui Xiwen Li Xian 'en Li Jianhe Wei Juyan Liu Yitao Wang Alice Hayward David Nelson Zemin Ning Reuben J. Peters Xiaoquan Qi Shilin Chen | 2016 | Molecular Plant2016，9，6： | 70 |
| 2 | Sediment pollution and its effect on fish through food chain in the Yangtze River显示文摘Suspended sediment adsorbs pollutants from flowing water in rivers and deposits onto the bed. However, the pollutants accumulated in the river bed sediment may affect the bio-community through food chain for a long period of time. To study the problem the concentration of heavy metals (Cr, Cd, Hg, Cu, Fe, Zn, Pb and As) in water, sediment, and fish/invertebrate were investigated in the middle and lower reaches of the Yangtze River during 2006-2007. The concentrations of heavy metals were 100-10,000 times higher in the sediment than in the water. Benthic invertebrates had relatively high concentrations of heavy metals in their tissues due to their proximity to contaminated sediments. Benthic invertivore fish had moderately high concentrations of heavy metals whereas phytoplanktivore fish, such as the silver carp, accumulated the lowest concentration of heavy metals. The concentrations of Cu, Zn, and Fe were higher than Hg, Pb, Cd, Cr, and As in the tissue samples. The concentration of heavy metals was lower in the river sediments than in the lake sediments. Conversely, the concentration of heavy metals was higher in river water than in lake water. While a pollution event into a water body is often transitory, the effects of the pollutants may be long-lived due to their tendency to be absorbed in the sediments and then released into the food chain. The heavy metals were concentrated in the following order: bottom material > demersal fish and benthic fauna > middle-lower layer fish > upper-middle layer fish > water. | Yujun YI Zhaoyin WANG Kang ZHANG Guoan YU Xuehua DUAN | 2008 | International Journal of Sediment Research2008，23，4： | 34 |
| 3 | Research on the slope spectrum of the Loess Plateau显示文摘A new concept dealing with digital analysis of loess terrain,slope spectrum,is presented and discussed in this paper,by introducing its characteristic,represen-tation and extracting method from DEMs. Using 48 geomorphological units in dif-ferent parts of the loess as test areas and 5 m-resolution DEMs as original test data,the quantitative depiction and spatial distribution of slope spectrum in China's Loess Plateau have been studied on the basis of a series of carefully-designed experiments. In addition,initial experiment indicates a strong relationship between the slope spectrum and the loess landform types,displaying a potential importance of the slope spectrum in geomorphological studies. Based on the slope spectrums derived from the 25 m-resolution DEM data in whole loess terrain in northern part of Shaanxi,13 slope spectrum indices were extracted and integrated into a compre-hensive layer with image integration method. Based on that,a series of unsuper-vised classifications was applied in order to make a landform classification in northern Shaanxi Loess Plateau. Experimental results show that the slope spec-trum analysis is an effective method in revealing the macro landform features. A continuous change of slope spectrum from south to north in northern Shaanxi Loess Plateau shows an obvious spatial distribution of different loess landforms. This also proves the great significance of the slope spectrum method in describing the terrain roughness and landform evolution as well as a further understanding on landform genesis and spatial distribution rule of different landforms in the Loess Plateau. | TANG GuoAn,LI FaYuan,LIU XueJun,LONG Yi & YANG Xin Key Laboratory of Virtual Geographic Environment,Nanjing Normal University,Ministry of Education,Nanjing 210046,China | 2008 | Science China(Technological Sciences)2008，51，S1： | 22 |
| 4 | Review of bio-optical imaging systems with a high space-bandwidth product显示文摘Optical imaging has served as a primary method to collect information about biosystems across scales—from functionalities of tissues to morphological structures of cells and even at biomolecular levels.However,to adequately characterize a complex biosystem,an imaging system with a number of resolvable points,referred to as a space-bandwidth product(SBP),in excess of one billion is typically needed.Since a gigapixel-scale far exceeds the capacity of current optical imagers,compromises must be made to obtain either a low spatial resolution or a narrow field-of-view(FOV).The problem originates from constituent refractive optics—the larger the aperture,the more challenging the correction of lens aberrations.Therefore,it is impractical for a conventional optical imaging system to achieve an SBP over hundreds of millions.To address this unmet need,a variety of high-SBP imagers have emerged over the past decade,enabling an unprecedented resolution and FOV beyond the limit of conventional optics.We provide a comprehensive survey of high-SBP imaging techniques,exploring their underlying principles and applications in bioimaging. | Jongchan Park David J.Brady Guoan Zheng Lei Tian Liang Gao | 2021 | Advanced Photonics2021，3，4： | 19 |
| 5 | An emission source inversion model based on satellite data and its application in air quality forecasts显示文摘This paper aims at constructing an emission source inversion model using a variational processing method and adaptive nudging scheme for the Community Multiscale Air Quality Model (CMAQ) based on satellite data to investigate the applicability of high resolution OMI (Ozone Monitoring Instrument) column concentration data for air quality forecasts over the North China. The results show a reasonable consistency and good correlation between the spatial distributions of NO2 from surface and OMI satellite measurements in both winter and summer. Such OMI products may be used to implement integrated variational analysis based on observation data on the ground. With linear and variational corrections made, the spatial distribution of OMI NO2 clearly revealed more localized distributing characteristics of NO2 concentration. With such information, emission sources in the southwest and southeast of North China are found to have greater impacts on air quality in Beijing. When the retrieved emission source inventory based on high-resolution OMI NO2 data was used, the coupled Weather Research Forecasting CMAQ model (WRF-CMAQ) performed significantly better in forecasting NO2 concentration level and its tendency as reflected by the more consistencies between the NO2 concentrations from surface observation and model result. In conclusion, satellite data are particularly important for simulating NO2 concentrations on urban and street-block scale. High-resolution OMI NO2 data are applicable for inversing NOx emission source inventory, assessing the regional pollution status and pollution control strategy, and improving the model forecasting results on urban scale. | CHENG XingHong XU XiangDe DING GuoAn | 2010 | Science China Earth Sciences2010，53，5： | 17 |
| 6 | Slope spectrum critical area and its spatial variation in the Loess Plateau of China显示文摘斜坡光谱被证明了是在在中国黄土地面的学习揭示 geomorphological 特征的重要方法论。在导出斜坡系列的批评区域的决心是一项不可缺少的任务。与学习区域的尺寸的增加一起,导出的系列越来越同样地正在变得,以便他们的差别能被忽略赞成一个标准。随后,测试尺寸被定义为斜坡光谱批评区域(SSCA ) 。SSCA 是斜坡光谱计算的基础不仅而且到某程度,黄土地势的 geomorphological 开发的思考。高分辨率 DEM 在提取斜坡光谱是重要的。有在北 Shaanxi 省的黄土高原的不同地形区域的一套 48 DEM 为实验被选择。SSCA 的空间分发与一个 geo 统计的分析方法被调查,导致从 6.18 km 2到 35.1 km 2 的价值。主要试验性的结果证明 SSCA 的空间分发与土壤侵蚀紧张的空间分发被相关,到反映地面复杂性的某个程度。斜坡光谱的批评区域从北方介绍 weak-strong-weak 的一个空间变化趋势给南方。四个地面参数,溪谷密度,斜坡偏斜度,地面驱动力(T d ) 和斜坡(求救) 的斜坡,被选择为指示物。在那里存在在 SSCA 和溪谷密度之间的一种好指数的功能关系,地面驱动力(T d ) 和在 SSCA 和斜坡偏斜度之间的一种对数函数关系。斜坡偏斜度增加,和溪谷密度,地面驱动力和求救与增加 SSCA 减少。SSCA 能作为一个区别因素被利用识别黄土地形,因为 SSCA 和黄土地形的进化的空间分布是关联词。从台地跟随黄土地形的进化到溪谷多山的区域,这也证明 SSCA 能代表本地地形的发展度。黄土高原的批评稳定的区域代表黄土地形的开发的度。它的主要意义是稳定的区域的感觉能被用来决定最小的地理单位。 | TANG Guoan SONG Xiaodong LI Fayuan ZHANG Yong XION-GLiyang | 2015 | Journal of Geographical Sciences2015，25，12： | 16 |
| 7 | Extraction and Analysis of Gully Head of Loess Plateau in China Based on Digital Elevation Model显示文摘In China′s Loess Plateau area, gully head is the most active zone of a drainage system in gully areas. The differentiation of loess gully head follows geospatial patterns and reflects the process of the loess landform development and evolution of its drainage system to some extent. In this study, the geomorphic meaning, basic characteristics, morphological structure and the basic types of loess gully heads were systematically analysed. Then, the loess gully head′s conceptual model was established, and an extraction method based on Digital Elevation Model(DEM) for loess gully head features and elements was proposed. Through analysing the achieved statistics of loess gully head features, loess gully heads have apparently similar and different characteristics depending on the different loess landforms where they are found. The loess head characteristics reflect their growth period and evolution tendency to a certain degree, and they indirectly represent evolutionary mechanisms. In addition, the loess gully developmental stages and the evolutionary processes can be deduced by using loess gully head characteristics. This study is of great significance for development and improvement of the theoretical system for describing loess gully landforms. | ZHU Hongchun TANG Guoan QIAN Kejian LIU Haiying | 2014 | Chinese Geographical Science2014，24，3： | 16 |
| 8 | Geomorphological inheritance for loess landform evolution in a severe soil erosion region of Loess Plateau of China based on digital elevation models显示文摘The influence of pre-quaternary underlying terrain on the formation of loess landforms, i.e., the geomorphological inheritance issue, is a focus in studies of loess landforms. On the basis of multi-source information, we used GIS spatial analysis methods to construct a simulated digital elevation model of a pre-quaternary paleotopographic surface in a severe soil erosion area of the Loess Plateau. To reveal the spatial relationship between underlying paleotopography and modern terrain, an XY scatter diagram, hypsometric curve, gradient and concavity of terrain profiles are used in the experiments. The experiments show that the altitude, gradient and concavity results have significant linear positive correlation between both terrains, which shows a relatively strong landform inheritance relationship, particularly in the intact and complete loess deposit areas. Despite the current surface appearing somewhat changed from the original shape of the underlying terrain under different erosion forces, we reveal that the modern terrain generally smoothes the topographic relief of underlying terrain in the loess deposition process. Our results deepen understanding of the characteristics of geomorphological inheritance in the formation and evolution of loess landforms. | XIONG LiYang TANG GuoAn YUAN BaoYin LU ZhongChen LI FaYuan ZHANG Lei | 2014 | Science China Earth Sciences2014，57，8： | 16 |
| 9 | Chinese progress in geomorphometry显示文摘Geomorphometry,the science of digital terrain analysis(DTA),is an important focus of research in both geomorphology and geographical information science(GIS).Given that 70% of China is mountainous,geomorphological research is popular among Chinese scholars,and the development of GIS over the last 30 years has led to significant advances in geomorphometric research.In this paper,we review Chinese progress in geomorphometry based on the published literature.There are three major areas of progress:digital terrain modelling methods,DTA methods,and applications of digital terrain models(DTMs).First,traditional vector-and raster-based terrain modelling methods,including the assessment of uncertainty,have received widespread attention.New terrain modelling methods such as unified raster and vector,high-fidelity,and real-time dynamic geographical scene modelling have also attracted research attention and are now a major focus of digital terrain modelling research.Second,in addition to the popular DTA methods based on topographical derivatives,geomorphological features,and hydrological factors extracted from DTMs,DTA methods have been extended to include analyses of the structure of underlying strata,ocean surface features and even socioeconomic spatial structures.Third,DTMs have been applied to fields including global climate change,analysis of various typical regions,lunar surface and other related fields.Clearly,Chinese scholars have made significant progress in geomorphometry.Chinese scholars have had the greatest international impact in areas including high-fidelity digital terrain modelling and DTM-based regional geomorphological analysis,particularly in the Loess Plateau and the Tibetan Plateau regions. | LV Guonian XIONG Liyang CHEN Min TANG Guoan SHENG Yehua LIU Xuejun SONG Zhiyao LU Yuqi YU Zhaoyuan ZHANG Ka WANG Meizhen | 2017 | Journal of Geographical Sciences2017，27，11： | 14 |
| 10 | Long-term thermal regimes of the Qinghai-Tibet Railway embankments in plateau permafrost regions显示文摘Ten years of ground temperature data(2003–2013) indicate that the long-term thermal regimes within embankments of the Qinghai-Tibet Railway(QTR) vary significantly with different embankment structures. Obvious asymmetries exist in the ground temperature fields within the traditional embankment(TE) and the crushed-rock basement embankment(CRBE). Measurements indicate that the TE and CRBE are not conducive to maintaining thermal stability. In contrast, the ground temperature fields of both the crushed-rock sloped embankment(CRSE) and the U-shaped crushed-rock embankment(UCRE) were symmetrical. However, the UCRE gave better thermal stability than the CRSE because slow warming of deep permafrost was observed under the CRSE. Therefore, the UCRE has the best long-term effect of decreasing ground temperature and improving the symmetry of the temperature field. More generally, it is concluded that construction using the cooling-roadbed principle meets the design requirements for long-term stability of the railway and for train transport speeds of 100 km h?1. However, temperature differences between the two shoulders, which exist in all embankments shoulders, may cause potential uneven settlement and might require maintenance. | NIU Fu un LIU MingHao CHENG GuoDong LIN ZhanJu LUO Jing YIN GuoAn | 2015 | Science China Earth Sciences2015，58，9： | 14 |
| 11 | 腰椎椎体间旋转中心的在体研究显示文摘目的测定生理载荷下正中矢状面上腰椎椎体间屈伸运动中心及横断面上腰椎椎体间左右旋转中心,为人工腰椎间盘假体设计的改进提供参考依据。方法招募40-450岁健康志愿者10名,采用双X线透视影像系统(dual fluoroscopic imaging system,DFIS)和MR检查相结合技术,在计算机软件辅助下,从受试者腰椎MRI获取每一节段腰椎三维重建模型,匹配到DFIS捕获的不同活动体位时腰椎双斜位X线透视图像上,重现生理载荷下腰椎椎体间三维运动状态,利用三维坐标系计算出生理载荷下正中矢状面上腰椎椎体间屈伸运动中心点及横断面上腰椎椎体间左右旋转中心点。结果在矢状面上L2,3 和L3,4的椎体中心点、骨性椎管中心点和棘突尖部运动范围分别为(0.3±0.3)mm、(0.6±0.3)mm;(2.5±1.7)mm、(2.3±1.1)mm;(7.5±3.2)mm、(7.3±3.6)mm。在横断面上L2,3和L2,4的椎体中心点、骨性椎管中心点和棘突尖部运动范围分别为(0.7±0.4)mm、(1.0±0.9)mm;(1.1±1.0)mm、(1.4±1.3)mm;(1.6±0.9)mm、(2.3±1.6)mm。经过线性拟合计算获得正中矢状面上腰椎椎体间(L2,3L3,4)屈伸运动中心位于椎体中轴后方5mm处,横断面上腰椎椎体间左右旋转中心位于椎体前方35.1mm(L2,3)和32.2mm(L3,4)。结论正常人体在生理载荷条件下,正中矢状面上腰椎椎体间(L2,3L3,4)屈伸运动中心在椎体中后1/3部位;而横断面上腰椎椎体间(L2,3L3,4)左右旋转中心在椎体前方约30mm处。 | 夏群 Shaobai Wang Guoan Li | 2010 | 中华骨科杂志2010，30，4： | 13 |
| 12 | The scaling method of specific catchment area from DEMs显示文摘特定的集水区域(SCA ) 被定义为一个联合起来的轮廓的在上游的集水区域。作为关键地面参数之一,它广泛地在当模特儿水文学,土壤侵蚀和生态的环境被使用。然而, SCA 价值在不同 DEM 分辨率显著地变化,它不可避免地影响地面分析结果。SCA 能被描述为集水区域(CA ) 和 DEM 格子长度的比率。在这份报纸, CA 的规模效果第一被调查。与 Jiuyuangou 溪谷,一个分水岭在中国的北 Shaanxi 省的大约 70 km2 作为测试区域, CA 上的 DEM 规模的影响在空间分发是不同的,这被发现。在 upslope 地点的 CA 价值与 DEM 分辨率的减少变得更大。当地点接近下游的区域时, CA 上的 DEM 规模的影响逐渐地正在变弱。CA 的规模效果能作为指数的衰落的一个数学趋势被结束。然后, SCA 的一个 downscaling 模型被介绍规模因素和地点因素提出。可伸缩的模型能在象素水平从粗糙的 DEM 分辨率认识到 SCA 价值的变换到更好的。downscaled SCA 好的实验结果表演修订了,并且与在关于统计索引,直方图和空间分发的目标决定的 SCA 一致。与没有实验参数的优点,可伸缩的模型能为在一个崎岖排水区域可伸缩的 SCA 被看作一个简单、客观的模型。 | YANG Xin TANG Guoan XIAO Chenchao GAO Yiping ZHU Shijie | 2011 | Journal of Geographical Sciences2011，21，4： | 12 |
| 13 | Paleotopographic controls on modern gully evolution in the loess landforms of China显示文摘The inhomogeneous and non-flat paleotopography in a depositional landform area profoundly controls the process of modern gully evolution and shapes the structure of a gully network.However,this controlling effect of paleotopography on modern gully evolution is mostly ignored because of the difficulties in paleotopography reconstruction.In this study,loess area in China is selected as case area for its typical depositional landform area and inhomogeneous and non-flat paleotopography during the Quaternary.The paleotopography underlying loess is considered while evaluating its controlling effects on the gully evolutionary process.On the basis of the geophysical prospecting,detailed geological information,and high-resolution digital elevation model,we reconstruct the pre-Quaternary paleotopographic surface in the case area.Comparative analysis is conducted to reveal the modern gully evolution in relation to the paleotopography.Results show that the concave area of the paleotopography acts as the basement of the high-order modern gully evolution in the hilly-gully area,although this concave area can be covered and buried by the loess depositional process during the Quaternary.A significant controlling effect of paleotopography on high-order modern gully evolution can be observed in a depositional landform with a hilly-gully underlying topography,whereas a relatively weak controlling effect exists in a flat underlying topographical area because of the strong horizontal shift effect of gully formation process.Several low-order modern gullies also exist and limit the controlling effect of paleotopography.These results reveal a controlled high-order modern gully evolutionary process and a rather dynamic low-order modern gully evolutionary process in the hilly-gully area.These results also help us understand the variations in different modern gully evolution in relation to paleotopography and the different management schemes for soil conservation and ecological restoration during the gully evolutionary process. | XIONG LiYang TANG GuoAn ZHU A-Xing YUAN BaoYin LU BinYing DANG TianMin | 2017 | Science China Earth Sciences2017，60，3： | 11 |
| 14 | An Object-based Approach for Two-level Gully Feature Mapping Using High-resolution DEM and Imagery: A Case Study on Hilly Loess Plateau Region, China显示文摘Gully feature mapping is an indispensable prerequisite for the motioning and control of gully erosion which is a widespread natural hazard. The increasing availability of high-resolution Digital Elevation Model(DEM) and remote sensing imagery, combined with developed object-based methods enables automatic gully feature mapping. But still few studies have specifically focused on gully feature mapping on different scales. In this study, an object-based approach to two-level gully feature mapping, including gully-affected areas and bank gullies, was developed and tested on 1-m DEM and Worldview-3 imagery of a catchment in the Chinese Loess Plateau. The methodology includes a sequence of data preparation, image segmentation, metric calculation, and random forest based classification. The results of the two-level mapping were based on a random forest model after investigating the effects of feature selection and class-imbalance problem. Results show that the segmentation strategy adopted in this paper which considers the topographic information and optimal parameter combination can improve the segmentation results. The distribution of the gully-affected area is closely related to topographic information, however, the spectral features are more dominant for bank gully mapping. The highest overall accuracy of the gully-affected area mapping was 93.06% with four topographic features. The highest overall accuracy of bank gully mapping is 78.5% when all features are adopted. The proposed approach is a creditable option for hierarchical mapping of gully feature information, which is suitable for the application in hily Loess Plateau region. | LIU Kai DING Hu TANG Guoan ZHU A-Xing YANG Xin JIANG Sheng CAO Jianjun | 2017 | Chinese Geographical Science2017，27，3： | 11 |
| 15 | Slope spectrum variation in a simulated loess watershed显示文摘在黄土材料和消除适当地代表真黄土表面的地方,一个模仿的黄土分水岭被采用与黄土分水岭进化在斜坡光谱调查变化。模仿的黄土分水岭的进化被人工的降雨的 exogenetic 力量驾驶。为三个月的一个时期,有不同紧张和持续时间的二十个人工的降雨事件被执行。在这个过程,九个 DEM 数据设定,有 10 公里格子分辨率的各个,被靠近范围的摄影测量学的方法建立。斜坡系列然后从这些 DEM 被提取。小心地设计的量的分析的随后的系列显示了在斜坡光谱和模仿的黄土分水岭的进化之间的一种强壮的关系。斜坡光谱的量的索引变化了定期跟随模仿的黄土分水岭的进化。吝啬的斜坡,斜坡光谱信息熵(H),地面驱动力( T d ),平均数补丁区域( AREA_MN ),传染索引( CONTAG ),和补丁结合索引(结合)不停地增加跟随模仿的分水岭的进化,当时偏斜度(S),周界区域分数维的尺寸( PAFRAC ),和散布和并排索引( IJI )代表了一个相反的趋势。所有这些索引在早、活跃的发展时期活跃地变化了,但是慢慢地在稳定的发展时期。这些试验性的结果显示斜坡系列的时间系列能有效地描绘模仿的黄土分水岭的斜坡分发,因此为为黄土地形建模介绍一个潜在的方法。 | Fayuan LI Guoan TANG Chun WANG Lingzhou CUI Rui ZHU | 2016 | Frontiers of Earth Science2016，10，2： | 9 |
| 16 | δ^(13)C difference between plants and soil organic matter along the eastern slope of Mount Gongga显示文摘Carbon isotope ratios (δ 13C) of plants, litter and soil organic matter (0–5 cm, 5–10 cm and 10–20 cm) on the eastern slope of Mount Gongga were measured. The results show that δ 13C values of plants, litter and soil organic matter all decrease first and then increase with altitude, i.e. δ 13C values gradually decrease from 1200 to 2100 m a.s.l., and increase from 2100 to 4500 m a.s.l. The δ 13C altitudinal variations are related to the distribution of C3 and C4 plants on the eastern slope of Mount Gongga, because C4 plants are observed to grow only below 2100 m, while C3 plants occur at all altitudes. There are significantly positive correlations among δ 13C of vegetation, δ 13C of litter and δ 13C of soil organic matter, and litter, 0–5 cm, 5–10 cm and 10–20 cm soil organic matter are 0.56‰, 2.87‰, 3.04‰ and 3.49‰ greater in δ 13C than vegetation, respectively. Considering the influences of rising concentration of atmospheric CO2 and decreasing δ 13C of atmospheric CO2 since the industry revolution on δ 13C of plants, 1.57‰ is proposed to be the smallest correction value for reconstruction of paleovegetation using δ 13C of soil organic matter. | CHEN PengNa WANG GuoAn HAN JiaMao LIU XiaoJuan LIU Min | 2010 | Chinese Science Bulletin2010，55，1： | 9 |
| 17 | Temporal and spatial changes of suspended sediment concentration and resuspension in the Yangtze River estuary显示文摘A detailed analysis of suspended sediment concentration (SSC) variations over a year period is presented using the data from 8 stations in the Yangtze River estuary and its adjacent waters, together with a discussion of the hydrodynamic regimes of the estuary. Spatially, the SSC from Xuliujing downwards to Hangzhou Bay increases almost constantly, and the suspended sediment in the inner estuary shows higher concentration in summer than in winter, while in the outer estuary it shows higher concentration in winter than in summer, and the magnitude is greater in the outer estuary than in the inner estuary, greater in the Hangzhou Bay than in the Yangtze River estuary. The sediments discharged by the Yangtze River into the sea are resuspended by marine dynamics included tidal currents and wind waves. Temporally, the SSC shows a pronounced neap-spring tidal cycle and seasonal variations. Furthermore, through the analysis of dynamic mechanism, it is concluded that wave and tidal current are two predominant factors of sediment resuspension and control the distribution and changes of SSC, in which tidal currents control neap-spring tidal cycles, and wind waves control seasonal variations. The ratio between river discharge and marine dynamics controls soatial distribution of SSC. | CHEN Shenliang, ZHANG Guoan, YANG Shilun(State Key Laboratory of Estuarine and Coastal Research, East China Normal University,Shanghai 200062, China) | 2003 | Journal of Geographical Sciences2003，13，4： | 9 |
| 18 | Aerosol influence domain of Beijing and peripheral city agglomeration and its climatic effect显示文摘The aerosol distribution in Beijing and peripheral cities agglomeration (BPCA) and its re- gional climatic effect are investigated on the basis of the statistical analyses of satellite Total Ozone Map- ping Spectrometer (TOMS) retrieval aerosol optical depth (AOD) and the meteorological data of sunshine duration, fog days, and low cloud cover, observed at Beijing and its peripheral meteorological stations. The analysis on multi-samples variational correction of the satellite remote sensing Moderate Resolution Imaging Spectroradiometer (MODIS) AOD under the clear sky and stable weather condition in conjunction with surface observations reveal that there was a “triangle-like” distribution pattern of the high values of aerosols in the southern “valley” of the “U-shape” megarelief of Beijing and its peripheral areas. The distribution pattern suggests that the large-scale transfer and diffusion of city agglomeration pollutants might form a relatively persistent characteristic spatial distribution of city agglomeration pollutants much larger than city-scale. Under the background of the particular megarelief effect of Beijing and periph- eral areas, the high value area of TOMS AOD, as well as regional correlation distribution between clear sky sunshine duration and TOMS AOD are also similar to the composite image of MODIS AOD variational fields, that is to say, the effect of atmospheric aerosols was very distinctive in Beijing and peripheral areas. The high value area of the negative correlation between clear sky sunshine duration and TOMS AOD ap-proximately accorded with the significant negative value area of the sunshine duration deviations of the 1980s to the 1990s, and the daily variations of the AOD also showed an anti-phase relation with those of clear sky sunshine duration. The above high cor- relation area of the urban aerosol impact of Beijing- Tianjin region leant towards south peripheral area, with its “center of gravity” in the south of Beijing- Tianjin agglomeration, and the main body of the high correlation area prolongating southwards, forming an aerosol influence domain of “eccentric ellipse” shape, that is to say, there was an aerosol influence domain of some “radius” in Beijing City and its peripheral areas, within and outside which sunshine duration, low cloud cover, and fog days showed a remarkable difference in interannual variation trend. At the downstream of the city agglomeration there was a significant interdecadal increment area of fog or low cloud cover, which might be associated with the local climatic feature of the regional flow convergent field in the diffusion process of city agglomeration pollut- ants in the aerosol influence domain, and such a local dynamical convergence feature might lead to the regional exacerbation of aerosol impact downstream of the city agglomeration. The research result reveals that the significant area of interdecadal change rate of low cloud cover within the aerosol influence do- main is correlated with the regional strengthening effect of aerosol impact of the local wind structure in the “downstream plume area” of the city. | XU Xiangde SHI Xiaohui ZHANG Shengjun DING Guoan MIAO Qiuju ZHOU Li | 2006 | Chinese Science Bulletin2006，51，16： | 8 |
| 19 | Nitrogen isotope composition characteristics of modern plants and their variations along an altitudinal gradient in Dongling Mountain in Beijing显示文摘Through the systematic investigation of nitrogen isotope composition (δ15N) in modern plants in Dongling Mountain in Beijing,the characteristics of δ15N in plants,the differences of δ15N among plants with different functional types,and the altitudinal trends of plant δ15N values revealed the environmental effects on δ15N.Our results are:(1) the values of δ15N of plants in Dongling Mountain range between -8.0‰ and 14.0‰,with an average value of -1.03‰;(2) δ15N values are variant among different plant functional types.Generally,the δ15N of shrubs are smaller than that of trees,and larger than that of herbaceous plants.The main reason may be the selective absorption of variant nitrogen resource with different δ15N values in soil;(3) there is a second-order polynomials relationship between the altitudes and the average δ15N values of plants,which shows a negative and positive correlation below and above 1350 m a.s.l.,respectively.This indicates that the precipitation is a main controlling factor of plant 15N fractionation for the former,and the temperature for the latter;(4) three different,i.e.,positive,negative,and no significant,correlations are performed between δ15N of individual species and altitudes.This may be related to different inherited characteristics and the process of nitrogen metabolize;and (5) variant altitudinal trends of plant δ15N are associated with different 15N composition of soil at different altitude,for which the key influencing factors are the changing temperature and precipitation with altitude rather than nitrogen content in leaf. | LIU XianZhao WANG GuoAn LI JiaZhu WANG Qing | 2010 | Science China Earth Sciences2010，53，1： | 7 |
| 20 | Study on variational aerosol fields over Beijing and its adjoining areas derived from Terra-MODIS and ground sunphotometer observation显示文摘This paper presents a comprehensive observa-tion technique on derived aerosols data from mobile sun-photometer graph and Terra-Moderate Resolution Imaging Spectroradiometer (MODIS) observation. Research results suggest that after being treated by the variational technique with respect to sunphotometer observations, the Terra- MODIS remote sensing aerosol data are remarkably im-proved, thus for the first time revealing features of the influ-ence of aerosols and pollution emissions of Beijing and its adjoining areas (Hebei, Shandong, etc. provinces). The re-gional impact features of aerosols are related with the pe-ripheral U-shape topography of Beijing. Analyses with Hy-brid Single Particle Lagrangian Integrated Trajectory model (HYSPLIT-4) and meteorological data in the case studied confirm the pollutants diffusion process along the trajectory from the sources in the south-west region, and the regional aerosol impact features. | XU Xiangde ZHOU Xiuji WENG Yonghui TIAN Guoliang LIU Yujie YAN Peng DING Guoan ZHANG Yuxiang MAO Jietai QIU Hong | 2003 | Chinese Science Bulletin2003，48，18： | 7 |
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