检索结果-南通市图书馆

Relationship between thermal anomalies in Tibetan Plateau and summer dust storm frequency over Tarim Basin,China

Journal of Arid Land 2013年第1期5卷 25-31页

作者： Yong ZHAO HongJun LI AnNing HUANG Qing HE Wen HUO MinZhong WANG Institute of Desert Meteorology China Meteorological Administration Urumqi 830002 China School of Atmospheric Sciences Nanjing University Nanjing 210093 China

The dust storm is the most important and frequent meteorological disaster over Tarim Basin, which causes huge damages on local social economics. How to predict the springtime and summertime dust storm oc- currence has become a hot issue for meteorologists. This paper employed the data of dust storm frequency and 10-m wind velocity at 35 stations over Tarim Basin and the reanalysis data from the National Center for Environ- mental Prediction and the National Center for Atmospheric Research （NCEP/NCAR） during 1961-2007 to study the relationship between dust storm frequency （DSF） in summer over Tarim Basin and the thermal anomalies in Tibetan Plateau in May by using the statistical methods, such as Empirical Orthogonal Function （EOF）, correlation and binomial moving average. The results show when negative anomalies in Tibetan Plateau and positive anomalies in its southern region are present along 30~N （the second mode of surface temperature anomalies by EOF decomposition） in May, the time coefficient （PC2） plays an important role in summer DSF variation and has a close relation with the summer DSF at both inter-annual and decadal time scales. When negative anomalies in Tibetan Plateau and positive anomalies are present in its southern region （PC2 in positive phase）, there is an anomalous anticyclone in North China, which weakens the northwest wind and is not beneficial for cold air moving from high latitude to the Tarim Basin, and the circulation pattern is hard to result in dust storm weather. Furthermore, the sea level pressure （SLP） increased over Tarim Basin and the direction of SLP gradient reversed, which resulted in the 10-m wind velocity slowing down, so the DSF decreased. From above all, it can be conclude that the thermal anomalies in Tibetan Plateau in May has important effects on the summertime dust storm frequency over Tarim Basin and the PC2 can be used as a prediction factor for the summertime dust storm occurrence.

关键词： dust storm frequency thermal anomalies Tarim Basin Tibetan Plateau

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

Digital thermal monitoring of the Amazon forest:an intercomparison of satellite and reanalysis products

引用

International Journal of Digital Earth 2016年第5期9卷 477-498页

作者： Juan C.Jiménez-Muñoz Cristian Mattar José A.Sobrino Yadvinder Malhi Global Change Unit Image Processing LaboratoryUniversity of ValenciaPaternaSpain Laboratory for Analysis of the Biosphere Department of Environmental Sciences and Renewable Natural ResourcesUniversity of ChileLa PintanaChile School of Geography and Environment Environmental Change InstituteUniversity of OxfordOxfordUK

Remote sensing and climate digital products have become increasingly available in recent *** to these products has favored a variety of Digital Earth studies,such as the analysis of the impact of global warming over different *** study of the Amazon forest response to drought has recently received particular attention from the scientific community due to the occurrence of extreme droughts and anomalous warming over the last *** paper focuses on the differences observed between surface thermal anomalies obtained from remote sensing moderate resolution imaging spectroradiometer(MODIS)and climatic(ERA-Interim)monthly products over the Amazon *** a few exceptions,results show that the spatial pattern of standardized anomalies is similar for both *** terms of absolute anomalies,the differences between the two products show a bias near to zero with a standard deviation of around 0.2 K,although the differences can be up to 1 K over particular regions and *** this general agreement,the proper filtering of MODIS daily values in order to construct a new monthly product showed a dramatic reduction in the number of reliable pixels during the rainy season,while for the dry season this reduction is only seen in Northern Amazonia.

关键词： thermal anomalies Amazon forest MODIS ERA interim thermal Amazonia

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

The Bionic Anticipation of Natural Disasters

引用

Journal of Bionic Engineering 2005年第3期2卷 123-144页

作者： Helmut Tributsch Hahn-Meitner-Institut Dept. Solare Energetik 14109 Berlin Germany

After major natural disasters, such as the recent earthquake-tsunami event in South Asia, reports appear about the mysterious ability of animals to anticipate and to escape the impending danger. This is an opportunity to recall the long history of this phenomenon in the traditions of different civilizations, to evaluate Chinese efforts, 30-40 years ago, to use this phenomenon for earthquake prediction, and to judge its state of acceptance in modem science. An effort is made to introduce this phenomenon as a research field of modem bionics. The timing is favorable since, increasingly, infrared thermal anomalies, monitored from satellite, suggesting litho-atmospheric processes, are found to precede earthquakes. They were unexpected by seismologists and are here suggested to essentially reflect the energy conversion patterns responsible for the signals monitored by animals. The aim is to learn from animals in the long term how natural disasters can better be anticipated, and how simple technical warning systems can be developed. Some challenges are analyzed. One is interpretation of the nature of energy release prior to the main earthquake disaster resulting in ＂macro-anomaly＂ precursors, another is better to understand the effect on animal senses. The role of non-linear cooperative phenomena including tsunamitype waves is emphasized.

关键词： natural disaster anticipation animal sensory systems earthquakes tsunami cooperative phenomena thermal anomalies

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

Why is the number of superplumes so limited?

Why is the number of superplumes so limited?

引用

中国科学院地质与地球物理研究所2003学术年会

作者： Uk Han Department of Earth and Environment Science Korea Military AcademySeoul 139-799Korea

Numerical simulation shows that the hot plumes can be formed by the self-accelerated process if local thermal perturbation is present Since the local thermal perturbation may exist extensively near the CMB and the transition zone around 670 km,the number of the hot plumes should be *** cold plume seems to be originated by the subduction *** the subduction belts distribute extensively on the Earth’s surface,the number of the cold plume should be also ***,the observed number of the superplumes is much less than the supposed ones.A simple 2D model of whole mantle convection is designed to investigate the interaction between plumes and thermal *** hot thermal anomalies(HTA) are imposed at CMB and a depth of about 670 km discontinuity,corresponding to two plausible locations of the hot plumes ***,the cold thermal anomalies(CTA) are imposed near the surface and 670 km discontinuity,corresponding to the subducted slabs and possible accumulation of slabs at 670 km *** numerical results show that the fixed HTA does not originate a new *** draws the hot plume to move towards itself and stabilizes the plume at its own *** imposed free HTA moves towards the hot plume,and finally merge with the *** situation for the CTA is similar to that for the hot *** the numerical results,we can reach the following *** is very difficult for the HTA/CTA to originate a new hot/cold plume in a convective flow *** boundary instability is suppressed by the developed *** of originating new hot/cold plumes,the HTA/CTA interact with the plumes to form huge *** might be one reason for the question,why the number of the superplumes is so limited.

关键词： superplume thermal anomalies finite difference technique numerical simulation thermal perturbation

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

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：