检索结果-南通市图书馆

第十三届全国气溶胶会议

作者： Jie Yu Huizheng Che Quanliang Chen Hongbin Chen Philippe Goloub Ke Gui Yu Zheng Hong Wang Yaqiang Wang Linchang An Tianze Sun Xiaoye Zhang Renjian Zhang Mingkai Dai State Key Laboratory of Severe Weather(LASW)and institute of Atmospheric Composition Chinese Academy of Meteorological Sciences CMA Plateau Atmospheric and Environment Key Laboratory of Sichuan Province College of Atmospheric SciencesChengdu University of Information Technology Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences Laboratoire d’Optique Amosphe′rique Universite′des Sciences et Technologies de Lille Key Laboratory for Aerosol-Cloud-Precipitation of china meteorological administration Nanjing University of Information Science and Technology National meteorological Center CMA Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences Key Laboratory for Semi-arid Climate Change of the Ministry of Education College of Atmospheric SciencesLanzhou University

This study compares the aerosol optical properties measured by CE318 sunphotometers at the institute of Atmospheric Physics and the Chinese Academy of meteorological Sciences in Beijing between January 2013 and July 2015 to provide the framework to quantify the spatial and temporal variability of aerosol *** optical parameters included extinction(scattering plus absorption) aerosol optical depth(EAOD), extinction ?ngstr?m exponent(EAE), columnar water vapor(CWV), absorption aerosol optical depth(AAOD), absorption ?ngstr?m exponent(AAE), extinction aerosol optical depth of fine particles(EAOD), extinction aerosol optical depth of coarse particles(EAOD), real parts of the refractive index(REFR), imaginary parts of the refractive index(REFI), single scattering albedo(SSA), asymmetry factor(ASYM), size distribution, and sphericity *** of aerosol optical properties using the simultaneous observations between two sites showed that correlation coefficients were larger than or equal to 0.98 for EAOD, EAE, and CWV, but smaller than or equal to 0.90 for AAOD, REFR, REFI, and SSA;the percentage differences for most of the parameters were less than 2%, but for EAOD were relatively large, ranging from 4.35 to 6.45%;the mean size distributions simultaneously showed bimodal patterns, with two peak volumes at the radii of 0.15 and 2.94 lm;two kinds of tri-peak model were apparent during the study period;a case of EAODs at 440 nm differing by more than 0.2 between the two sites reflected the effect of local aerosol *** of aerosol characterization inferred by absorption properties using all the inversion data showed that classification using EAE, AAE, and sphericity fraction indicated the main aerosol type was ‘‘U/I&BB’’(urban/industrial and biomass-burning), accounting for 59.87 and 57.43%, respectively;the volume size distribution retrievals binned by AAE exhibited coarse mode particles became dominant as AAE increased to 2.0;the SSA

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Recent advances in precipitation-bias correction and application

引用

Research in Cold and arid Regions 2009年第3期1卷 193-198页

作者： DaQing Yang 1, NingLian Wang 2, BaiSheng Ye 2, LiJuan Ma 3 1. Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, Alaska 99775-5860, USA. 2. State Key Laboratory of Cryospheric Sciences, Cold and arid Regions Environmental and Engineering Research institute, Chinese Academy of Sciences, lanzhou, Gansu 730000, china. 3. Laboratory for Climate Studies, china meteorological administration, Beijing 100081, china. Univ Alaska Fairbanks Water & Environm Res Ctr Fairbanks AK 99775 USA Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst State Key Lab Cryospher Sci Lanzhou 730000 Gansu Peoples R China china Meteorol Adm Lab Climate Studies Beijing 100081 Peoples R China

Significant progresses have been made in recent years in precipitation data analyses at regional to global scales. This paper re-views and synthesizes recent advances in precipitation-bias corrections and applications in many countries and over the cold re-gions. The main objective of this review is to identify and examine gaps in regional and national precipitation-error analyses. This paper also discusses and recommends future research needs and directions. More effort and coordination are necessary in the determinations of precipitation biases on large regions across national borders. It is important to emphasize that bias cor-rections of precipitation measurements affect both water budget and energy balance calculations, particularly over the cold regions.

关键词： precipitation gauge measurement bias correction cold region

来源：

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

Effects of Soil Hydraulic Properties on Soil Moisture Estimation

引用

Journal of meteorological Research 2023年第1期37卷 58-74页

作者： Xiaolei FU Haishen LYU Zhongbo YU Xiaolei JIANG Yongjian DING Donghai ZHENG Jinbai HUANG Hongyuan FANG College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou 225009 Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources Nanjing University of Information Science&TechnologyNanjing 210044 State Key Laboratory of Hydrology–Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098 Joint International Research Laboratory of Global Change and Water Cycle Hohai UniversityNanjing 210098 Yangtze institute for Conservation and Development Hohai UniversityNanjing210098 State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000 institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101

Accurate quantification of soil moisture is essential to understand the land surface *** hydraulic properties influence water transport in soil and thus affect the estimation of soil ***,some soil hydraulic properties are only observable at a few field *** this study,the effects of soil hydraulic properties on soil moisture estimation are investigated by using the one-dimensional(1-D)Richards equation at ELBARA,which is part of the Maqu monitoring network over the Tibetan Plateau(TP),*** moisture assimilation experiments are then conducted with the unscented weighted ensemble Kalman filter(UWEnKF).The results show that the soil hydraulic properties significantly affect soil moisture *** soil hydraulic conductivity(Ksat)is optimized based on its observations in each soil layer with a genetic algorithm(GA,a widely used optimization method in hydrology),and the 1-D Richards equation performs well using the optimized *** the range of Ksat for a complete soil profile is known for a particular soil texture(rather than for arbitrary layers within the horizon),optimized Ksat for each soil layer can be obtained by increasing the number of generations in GA,although this increases the computational cost of *** performs well with optimized Ksat,and improves the accuracy of soil moisture simulation more than that with calculated ***,better soil moisture estimation can be obtained by using optimized saturated volumetric soil moisture content *** summary,an accurate soil profile can be obtained by using soil moisture assimilation with optimized soil hydraulic properties.

关键词： soil moisture one-dimensional(1-D)Richards equation unscented weighted ensemble Kalman filter(UWEnKF) soil hydraulic properties genetic algorithm

来源：

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

Simulation of historical and projected climate change in arid and semiarid areas by CMIP5 models

引用

Chinese Science Bulletin 2014年第12期59卷 412-429页

作者： Tianbao Zhao Liang Chen Zhuguo Ma Key Laboratory of Regional Climate-Environment Research for East Asia Institute of Atmospheric Physics (IAP) Chinese Academy of Sciences (CAS)

Based on Climatic Research Unit Time Series3.1 temperature and Global Precipitation Climatology Center full data reanalysis version 6 precipitation data,the abilities of climate models from the fifth phase of the Coupled Model Intercomparison Project to simulate climate changes over arid and semiarid areas were *** of future climate changes under different representative concentration pathways(RCPs)were also *** key findings were that most of the models are able to capture the dominant features of the spatiotemporal changes in temperature,especially the geographic distribution,during the past 60 years,both globally as well as over arid and semiarid *** addition,the models can reproduce the observed warming trends,but with magnitudes generally less than the observations of around0.1–0.3°C/*** to temperature,the models perform worse in simulating the annual evolution of observed precipitation,underestimating both the variability and tendency,and there is a huge spread among the models in terms of their simulated precipitation *** multimodel ensemble mean is overall superior to any individual model in reproducing the observed climate *** terms of future climate change,an ongoing warming projected by the multi-model ensemble over arid and semiarid areas can clearly be seen under different RCPs,especially under the high emissions scenario(RCP8.5),which is twice that of the moderate scenario(RCP4.5).Unlike the increasing temperature,precipitation changes vary across areas and are more significant under high-emission RCPs,with more precipitation over wet areas but less precipitation over dry *** particular,northern china is projected to be one of the typical areas experiencing significantly increased temperature and precipitation in the future.

关键词：未来气候变化半干旱地区仿真模型模拟降水量模拟观测预测历史降水资料

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：