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Typhoon Track Forecast with a Hybrid GSI-ETKF Data Assimilation System

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Atmospheric and Oceanic Science Letters 2013年第3期6卷 161-166页

作者： LUO Jing-Yao CHEN Bao-De LI Hong fan guang-zhou WANG Xiao-Feng College of Atmospheric Sciences Chengdu University of Informational Technology Shanghai Typhoon Institute China Meteorological Administration (CMA)

A hybrid grid-point statistical interpolation-ensemble transform Kalman filter (GSI-ETKF) data assimilation system for the Weather Research and Forecasting (WRF) model was developed and applied to typhoon track forecast with simulated dropsonde observations. This hybrid system showed significantly improved results with respect to tropical cyclone track forecast compared to the standard GSI system in the case of Muifa in 2011. Further analyses revealed that the flow-dependent ensemble covariance was the major contributor to the better performance of the GSI-ETKF system than the standard GSI system; the GSI-ETKF system was found to be potentially able to adjust the position of the typhoon vortex systematically and better update the environmental field.

关键词： data assimilation hybrid tropical cyclone flow-dependent

Changes to the Natural Regional Boundaries in China During 1961-2007

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Atmospheric and Oceanic Science Letters 2011年第4期4卷 199-203页

作者： YU Zhen-Yan fan guang-zhou DONG Yi-Ping WANG Lei HUA Wei zhou Ding-Wen Zhejiang Climate Center Hangzhou 310017 China College of Atmospheric Sciences Chengdu University of Information Technology （CULT） Chengdu 610225 China

Daily temperature data from 599 stations across China for the years 1961 to 2007 were used to analyze the changes in the natural regional boundaries. The results show that the accumulated temperature ≥10℃ and its duration changed dramatically from the end of 1990s to the early 21 st century. The amplitude of natural regional boundaries was greater in the 21st century than it was in the 20th century. In the eastern region of China, the climatic zones were migrating generally northward, with the northern edge of the subtropical zone and the eastern section of the warm temperate zone showing an obvious northward shift of up to 1-3° of latitude. The climatic zones moved south in the Qinghal-Tibet Plateau, western Inner Mongolia, and some areas of western Xinjiang, and slightly to the north in other parts of the western region.

关键词： accumulated temperature duration natural regional boundary global warming

Characteristics of complex air pollution in typical cities of North China

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Atmospheric and Oceanic Science Letters 2018年第1期11卷 29-36页

作者： TANG Bin-Yan XIN Jin-Yuan GAO Wen-Kang SHAO Ping SU Hong-Juan WEN Tian-Xue SONG tao fan guang-zhou WANG Shi-Gong plateau Atmosphere and Environment Key Laboratory of Sichuan Province ＆ College of Atmospheric Sciences Chengdu University of Information Technology Chengdu China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science ＆Technology Nanjing China

The Beijing-Tianjin-Hebei urban agglomeration is currently facing severe complex air pollution. In this paper, simultaneous observations conducted in 2014 show that the annual mean concentration of fine particulate matter （PM2.5） was 84 ± 70, 86 ±60, and 118 ± 95 μg m-3 in Beijing, Tianjin, and Shijiazhuang, respectively. The mean 03 8h max in the summer was 171 ± 43, 147 ± 45, and 146 ± 44 μg m-3, respectively. This research indicates that PM2.5 and O3 are positively correlated when the temperature exceeds 20 ℃5 and the urban agglomeration shows characteristics of complex air pollution consisting of superimposed 03 and PM2.s. In summer, when the humidity was less than 55%, secondary particles and 03 also increased in a coordinated manner （y = 1.35x ＋ 29.85; R2 = 0.61）, which demonstrates severe complex pollution. However, the mean PM2.5（y） and mean 03 8 h max （x） in summer showed a negative correlation （y = - 1.3x ＋ 245; R2 = 0.61 ） in the three regions, indicating high concentrations of PM2.5 pollution partially inhibit O3 generation.

关键词： O3 PM2.5 PM10 complex airpollution Beijing-Tianjin-Hebei urban agglomeration

Effects of transport on aerosols over the eastern slope of the Tibetan Plateau:synergistic contribution of Southeast Asia and the Sichuan Basin

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Atmospheric and Oceanic Science Letters 2018年第5期11卷 425-431页

作者： SU Hong-Juan XIN Jin-Yuan MA Yong-Jing LIU Zirui WEN Tian-Xue WANG Shi-Gong fan guang-zhou LI Wei WANG Lu HE Zhi-Ming WANG Yue-Si Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information TechnologyChengduChina State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjingChina Chinese Academy of Sciences Institute of Mountain Hazards and Environment(IMHE)ChengduChina Jiangxi Weather Modification Office NanchangJiangxi Meteorological BureauChina

The aerosol optical properties and chemical components of PM2.1(particulate matter with a diameter of 2.1μm or less)were investigated at Mount Gongga on the eastern slope of the Tibetan Plateau from April 2012 to December *** annual mean aerosol optical depth(AOD)was 0.35±0.23,and the?ngstr?m exponent was 1.0±*** AOD exhibited higher values in summer and winter,but lower values in spring and *** the observational periods into dry and wet seasons,the authors found that the concentrations of K^+,elemental carbon,secondary inorganic aerosols,and primary and secondary organic carbon in the dry(wet)season were 0.29(0.21),0.88(0.60),7.4(4.5),7.5(5.1),and 3.9(12)μg m?3,*** with trajectory analysis,the authors found that higher concentrations of K^+,elemental carbon,and primary organic carbon indicated the effects of biomass burning from Southeast Asia during the dry ***,the oxidation of volatile organic compounds was the main source of aerosols during the wet season,which originated from the Sichuan Basin.

关键词： Tibetan Plateau aerosol optical depth aerosol components biomass burning regional transport

Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar‑Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants

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Nano-Micro Letters 2025年第2期17卷 548-565页

作者： Ming‑Yuan Yu Jing Wu guang Yin fan‑Zhen Jiao Zhong‑Zhen Yu Jin Qu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although solar steam generation strategy is efficient in desalinating seawater,it is still challenging to achieve continuous solar-thermal desalination of seawater and catalytic degradation of organic ***,dynamic regulations of hydrogen bonding networks and solvation structures are realized by designing an asymmetric bilayer membrane consisting of a bacterial cellulose/carbon nanotube/Co_(2)(OH)_(2)CO_(3)nanorod top layer and a bacterial cellulose/Co_(2)(OH)_(2)CO_(3)nanorod(BCH)bottom ***,the hydrogen bonding networks inside the membrane can be tuned by the rich surface–OH groups of the bacterial cellulose and Co_(2)(OH)_(2)CO_(3)as well as the ions and radicals in situ generated during the catalysis ***,both SO_(4)^(2−)and HSO_(5)−can regulate the solvation structure of Na^(+)and be adsorbed more preferentially on the evaporation surface than Cl^(−),thus hindering the de-solvation of the solvated Na^(+)and subsequent nucleation/growth of ***,the heat generated by the solar-thermal energy conversion can accelerate the reaction kinetics and enhance the catalytic degradation *** work provides a flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane for synergistic solar thermal desalination of seawater/brine and catalytic degradation of organic pollutants.

关键词： Solar steam generation Seawater desalination Catalytic degradation Bacterial cellulose Cobalt hydroxycarbonate nanorods

多连杆机械臂GA-RBF神经网络轨迹跟踪控制

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机械科学与技术 2018年第5期37卷 669-674页

作者：肖凡李光周鑫林湖南工业大学机械工程学院湖南株洲412007

针对多连杆机械臂模型系统信息不完整、存在外界干扰等问题,设计了一种新型的GA-RBF神经网络闭环自适应控制系统。该系统利用径向基函数(RBF)神经网络来逼近并补偿系统的模型误差和外界扰动,在基于计算力矩法的基础上实现对机械臂的轨... 详细信息

针对多连杆机械臂模型系统信息不完整、存在外界干扰等问题,设计了一种新型的GA-RBF神经网络闭环自适应控制系统。该系统利用径向基函数(RBF)神经网络来逼近并补偿系统的模型误差和外界扰动,在基于计算力矩法的基础上实现对机械臂的轨迹跟踪控制,并采用遗传算法(GA)对RBF神经网络权值进行在线优化,确保机械臂控制系统能在更短时间内获得稳定,实现了高精度的轨迹跟踪,提高了轨迹跟踪的性能。MATLAB数值仿真的结果验证了该方法的有效性。

关键词：计算力矩法 RBF神经网络遗传算法机械臂轨迹跟踪 MATLAB

2000-2016年青藏高原土壤温度变化特征分析

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西南大学学报（自然科学版） 2019年第9期41卷 40-51页

作者：杨楠范广洲成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室/气候与环境变化联合实验室

该研究使用较新的、连续性好的、高分辨率(0.25°×0.25°)的GLDAS(Global Land Data Assimilation System)Noah v2.1陆面模式资料,采用线性倾向估计、t检验、相关性分析和经验正交函数分解等方法,分析了2000-2016年青藏高原土壤温度的... 详细信息

该研究使用较新的、连续性好的、高分辨率(0.25°×0.25°)的GLDAS(Global Land Data Assimilation System)Noah v2.1陆面模式资料,采用线性倾向估计、t检验、相关性分析和经验正交函数分解等方法,分析了2000-2016年青藏高原土壤温度的变化特征.结果表明,土壤温度受地形和海拔影响,高原地区平均土壤温度比周边地区低,北部比南部低.高原西北部的昆仑山脉至阿里地区附近存在-10℃冷中心,高原东北部的柴达木盆地存在5℃暖中心.春秋土壤温度空间分布与平均土壤温度空间分布相似,夏季最暖,冬季最冷.EOF分析土壤温度第一模态均表现出明显的全区一致升温型.进一步分析年际变化发现4层土壤温度逐年升温且变化十分相似.2005年之前几乎呈现线性增温趋势,2005年之后呈现波动变化但仍为增温趋势.趋势系数空间分布发现各层土壤温度均不断增温且空间分布相似,高原地区增温趋势强于周边地区,高原主体部位西部增温强于东部.随着深度的增加,增温趋势逐渐减弱.以0~10 cm为代表层说明增温的主要空间分布特征:高原大部分地区土壤温度均以0.1至0.3℃/10a的速率增温,最大增温中心在阿里北部地区,数值达0.67℃/10a.春季增温最强,秋夏次之,冬季最弱.

关键词：青藏高原土壤温度 GLDAS

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北京地区大气颗粒物输送路径及潜在源分析

中国环境科学 2019年第3期39卷 915-927页

作者：李颜君安兴琴范广洲成都信息工程大学大气科学学院四川成都610225 中国气象科学研究院大气成分研究所北京100081

利用TrajStat软件和全球资料同化系统数据,计算了2005～2016年北京市逐日72h气流后向轨迹,采用聚类分析方法,结合北京同期PM_(2.5)逐日质量浓度数据,分析北京市年及四季后向气流轨迹特征及其对北京市颗粒物浓度的影响,运用潜在源贡献因... 详细信息

利用TrajStat软件和全球资料同化系统数据,计算了2005～2016年北京市逐日72h气流后向轨迹,采用聚类分析方法,结合北京同期PM_(2.5)逐日质量浓度数据,分析北京市年及四季后向气流轨迹特征及其对北京市颗粒物浓度的影响,运用潜在源贡献因子分析法(PSCF)和浓度权重轨迹分析法(CWT),探讨研究时期内不同季节影响北京市颗粒物质量浓度的潜在源区以及不同源区对北京颗粒物质量浓度的贡献.结果表明,就全年而言,西北输送气流占总轨迹的比例最高,达59.97%,且其输送距离最远、输送高度最高、移速最快.输送高度最低、距离最短、移速最慢的东南气流占比次之,为27.64%,东北气流占比最低为12.40%,其移速和输送距离介于前两者之间.主要污染轨迹来自山东、河北,其次为来自俄罗斯、蒙古国和内蒙古荒漠戈壁地区的西北气流.PSCF和CWT分析发现,蒙中、晋中、冀西南、豫北及鲁西是影响北京PM_(2.5)的主要潜在区域.而不同季节、不同输送路径对北京PM_(2.5)污染影响的差异显著,春季主要受来自蒙晋交界区域的短距离输送气流影响,潜在源区位于冀南、鲁西、豫东和皖西北地区,夏季污染轨迹来自鲁、晋地区,潜在源区为豫东北、皖北和苏北地区;秋季主要受来自冀南地区的短距离气流影响,潜在源区为晋北、冀南、豫北和鲁西地区,冬季主要受来自蒙古国中西部和蒙中地区的远距离输送气流影响,潜在源区主要在冀南、鲁西、豫北、晋和蒙西地区.

关键词：大气颗粒物后向轨迹聚类分析潜在源贡献浓度权重轨迹北京

高分辨嵌套区域气候模式对我国中、东部地区夏季气候的数值模拟

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高原气象 1999年第4期18卷 641-648页

作者：范广洲吕世华中国科学院兰州高原大气物理研究所甘肃省兰州市730000

利用引进的ＮＣＡＲＲｅｇＣＭ２模式在较高分辨率情况下，对我国东部地区夏季（７月）气候状况进行了数值模拟。结果表明，模式能够较真实地再现我国东部地区夏季气候的基本状况。模拟的海平面气压场、５００ｈＰａ高度场、地表... 详细信息

利用引进的ＮＣＡＲＲｅｇＣＭ２模式在较高分辨率情况下，对我国东部地区夏季（７月）气候状况进行了数值模拟。结果表明，模式能够较真实地再现我国东部地区夏季气候的基本状况。模拟的海平面气压场、５００ｈＰａ高度场、地表温度场以及对流层高、低层风场等的分布形式，都与实测场比较一致。并且较好地模拟出了７月中旬副热带高压的北跳。模式模拟的夏季降水场分布形式也与观测结果一致，高、低值中心都对应较好，不足之处是模拟中心值偏强，尤其是黄河上游的高值中心偏高近５倍，江南地区的低值中心偏低１倍左右，这可能是由侧边界条件引起的。位于模式区域中部的华北地区降水模拟较好，区域平均７月份降水为１７３．５ｍｍ，与观测结果接近。

关键词：区域气候模式中国东部地区夏季气候数值模拟