检索结果-南通市图书馆

A New Method to Compare Hourly Rainfall between Station Observations and Satellite Products over Central–Eastern China

引用

Journal of Meteorological Research 2016年第5期30卷 737-757页

作者： CHEN Haoming YU Rucong SHEN Yan State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 National Meteorological Information Center Beijing 100081

This study employs a newly defined regional-rainfall-event （RRE） concept to compare the hourly charac- teristics of warm-season （May September） rainfall among rain gauge observations, China merged hourly pre- cipitation analysis （CMPA-Hourly）, and two commonly used satellite products （TRMM 3B42 and CMORPH） By considering the rainfall characteristics in a given limited area rather than a single point or grid, this method largely eliminates the differences in rainfall characteristics among different observations or measure- ments over central-eastern China. The results show that the spatial distribution and diurnal variation of RRE frequency and intensity are quite consistent among different datasets, and the performance of CMPA- Hourly is better than the satellite products when compared with station observations. A regional rainfall coefficient （RRC）, which can be used to classify local rain and regional rain, is employed to represent the spatial spread of rainfall in the limited region defining the RRE. It is found that rainfall spread in the selected grid box is more uniform during the nocturnal to morning hours over central-eastern China. The RRC tends to reach its diurnal maximum several hours after the RRE intensity peaks, implying an in- termediate transition stage from convective to stratiform rainfall. In the afternoon, the RRC reaches its minimum, implying the dominance of local convections on small spatial scale in those hours, which could cause large differences in rain gauge and satellite observations. Since the RRE method reflects the overall features of rainfall in a limited region rather than at a fixed point or in a single grid, the widely recognized overestimation of afternoon rainfall in satellite products is more reliable in representing sub-daily variation of rainfall a reasonable method to compare satellite products with which also has great potential to be used in evaluating the numerical models. not obvious, and thus the satellite estimates are

关键词： regional rainfall event regional rainfall coefficient diurnal variation spatial spread satellite precipitation

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

Assessing the spread risk of COVID-19 associated with multi-mode transportation networks in China

引用

Fundamental Research 2023年第2期3卷 305-310页

作者： Xiao-Ke Xu Xiao Fan Liu Lin Wang Ye Wu Xin Lu Xianwen Wang Sen Pei College of Information and Communication Engineering Dalian Minzu UniversityDalian 116600China Web Mining Laboratory Department of Media and CommunicationCity University of Hong KongHong Kong SARChina Department of Genetics University of CambridgeCambridge CB23EHUK School of Information Engineering Putian UniversityPutian 351100China School of Journalism and Communication Beijing Normal UniversityBeijing 100875China College of Systems Engineering National University of Defense TechnologyChangshaChina Department of Global Public Health Karolinska InstituteStockholmSweden WISE Lab Faculty of Humanities and Social SciencesDalian University of TechnologyDalian 116085China Department of Environmental Health Sciences Mailman School of Public HealthColumbia UniversityNew YorkNY 10032USA

The spatial spread of COVID-19 during early 2020 in China was primarily driven by outbound travelers leaving the epicenter,Wuhan,Hubei *** studies focus on the influence of aggregated out-bound population flows originating from Wuhan;however,the impacts of different modes of transportation and the network structure of transportation systems on the early spread of COVID-19 in China are not well ***,we assess the roles of the road,railway,and air transportation networks in driving the spatial spread of COVID-19 in *** find that the short-range spread within Hubei province was dominated by ground traffic,notably,the railway *** contrast,long-range spread to cities in other provinces was mediated by multiple factors,including a higher risk of case importation associated with air transportation and a larger outbreak size in hub cities located at the center of transportation *** further show that,although the dissemination of SARS-CoV-2 across countries and continents is determined by the worldwide air transportation network,the early geographic dispersal of COVID-19 within China is better predicted by the railway *** the recent emergence of multiple more transmissible variants of SARS-CoV-2,our findings can support a better assessment of the spread risk of those variants and improve future pandemic preparedness and responses.

关键词： Complex network Human mobility COVID-19 spatial spread Transportation networks

来源：

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

An Improved Solution to Identify spatial Invasion on Metapopulation Networks with SI model

An Improved Solution to Identify Spatial Invasion on Metapop...

引用

第40届中国控制会议

作者： Yinyin Peng Bo Hu Hui Feng Xiang Li Cong Li Department of Electronic Engineering Fudan University Adaptive Networks and Control Lab Department of Electronic EngineeringFudan University

Large-scale outbreaks of epidemics are inextricably linked to the spatial spread via carriers, in addition to the strong infectiousness of the disease itself. Identifying the spatial invasion pathways on the metapopulation network is important for further prediction and control of the spread of infectious diseases. The whole inference task can be decomposed into a series of uncorrelated invasion cases, of which some are identified accurately and the others are inferred with the maximum likelihood method after a complexity reduction process. In this paper, we present and prove the sufficient conditions for the dominant type of invasion cases to be identified accurately. Moreover, a recursive algorithm is proposed to traverse all the possible invasion pathways among which the most likely one will be selected as the result. Finally, simulations on a synthetic metapopulation network verify our algorithm.

关键词： Epidemics Maximum likelihood Metapopulation networks SI model spatial spread

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

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

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

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：