检索结果-南通市图书馆

Palaeoclimate simulation of Little Ice Age

Progress in Natural Science:Materials International 2004年第8期 68-76页

作者： LIU Jian 1, CHEN Xing 2, WANG Sumin 1 and ZHENG Yiqun 1 (1. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China 2. Department of Atmospheric Science, Nanjing University, Nanjing 210093, China) Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China Department of Atmospheric Science Nanjing University Nanjing 210093 China

Little Ice Age (LIA) is a typical cold climate period in global scope with a profound impact upon human society. In this study, a coupled global atmospheric circulation model including the land processes (AGCM + SSiB) is used to perform the simulation of LIA climate. Under the control of solar radiation reduction mechanism, the decrease of temperature is more obvious in summer than in winter; meanwhile, there is regional difference in the change of winter temperature. But the temperature decrease is the main characteristic of the annual mean temperature. Volcanic dust has an evident effect on the winter temperature decrease, but to a less extent than the solar radiation. The synchronous function caused by the reduction of solar radiation and the increase of optic depth of volcanic dust has a superposed strengthening effect on the temperature decrease in large regions. Promotion of the vegetation cover rate profits the increase of temperature, and vise versa. Certain decrease of solar radiation will favor the increase of summer monsoon precipitation in East Asia. The increase of optic depth of volcanic dust does not have a significant effect on the annual precipitation in most parts of Eurasian continent. The composite effect of the decrease of solar radiation and the increase of volcanic dust makes the summer monsoon precipitation in East China increase, and that in South Asia decrease. Together with vegetation change, the result shows that precipitation increases with the increase of vegetation coverage (e.g. East Asia), and when the vegetation coverage reduces (e.g. North Africa) the precipitation will decrease, too.

关键词： Little Ice Age model simulation East Asia.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Temperature variations along the Silk Road over the past 2000 years:Integration and perspectives

引用

Science China Earth Sciences 2023年第7期66卷 1468-1477页

作者： Jianhui CHEN Haipeng WANG Yan LIU Shuai MA Wei HUANG MOE Key Laboratory of Western China’s Environmental Systems Lanzhou UniversityLanzhou 730000China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Reconstructing temperature changes along the Silk Road(SR)over the last two millennia can provide insights into past global changes and their impact on the rise and fall of ancient civilizations in this region.Numerous high-quality single-site paleotemperature records have been produced for the eastern part of the SR(mainly for the Xinjiang region and its surrounding areas),which provide the data basis for a comprehensive synthesis.In this study,we used objective criteria to select 10 highquality ones from 30 temperature reconstructions derived from various geological archives including lacustrine sediments,ice cores,and tree rings in this region.Our aims are to summarize the pattern of temperature change over the past 2000 years,to provide a long-term viewpoint on the present warming,and to evaluate the impact of climate change on civilizations along the SR.The principal results are as follows:(1)The temperature variations over the last millennium are mutually consistent within these records.The study area experienced typical climate anomalies during the Medieval Warm Period(MWP,AD 1000-1250),the Little Ice Age(LIA,AD 1450-1850),and the Current Warm Period(CWP,AD 1850 to present);however,contrary to previous knowledge,the amplitude of climatic warming during the CWP did not exceed that during the MWP.(2)Fewer temperature records were available for the interval AD 1–1000,and there were large differences between them.For example,the reconstructed climate during both the Han Dynasty and the Sui-Tang Dynasties was either warm or cold,without prevailing consensus.(3)The warming during the MWP favored the rapid development of the SR route along the northern slopes of the Tianshan Mountains,and the cooling during the LIA contributed to the decline of the SR marked by the closure of the Jiayuguan Pass.Notably,the scarcity of temperature records and the discrepancies between them during AD 1-1000 in the eastern part of the SR have hindered our understanding of the hydroclimatic changes and their influence on the developm

关键词： Silk Road Medieval Warm Period Little Ice Age Current Warm Period Rise and fall of civilizations

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

Human activity and climate change triggered the expansion of rocky desertification in the karst areas of Southwestern China

引用

Science China Earth Sciences 2021年第10期64卷 1761-1773页

作者： Chaojun CHEN Daoxian YUAN Hai CHENG Tsailuen YU Chuanchou SHEN RLawrence EDWARDS Yao WU Siya XIAO Jian ZHANG Tao WANG Ran HUANG Ziqi LIU Tingyong LI Junyun LI Chongqing Key Laboratory of Karst Environment School of Geographical SciencesSouthwest UniversityChongqing 400715China Key Laboratory of Karst Dynamics MNRGuangxiInstitute of Karst GeologyChinese Academy of Geological SciencesGuilin 541004China Yunnan Key Laboratory of Plateau Geographical Processes&Environmental Changes Faculty of GeographyYunnan Normal UniversityKunming 650500China Institute of Global Environmental Change Xi’an Jiaotong UniversityXi’an 710049China High-precision Mass Spectrometry and Environment Change Laboratory(HISPEC) Department of GeosciencesTaiwan UniversityTaipei 10617China Research Center for Future Earth Taiwan UniversityTaipei 10617China Global Change Research Center Taiwan UniversityTaipei 10617China Department of Earth Sciences University of MinnesotaMinneapolisMN 55455USA Environnements et Paléoenvironnements Océaniques et Continentaux(EPOC) UMR CNRS 5805Universitéde BordeauxPessac 33600France School of Karst Science Guizhou Normal UniversityGuiyang 550001China

It is conducive to the sustainable development of human beings in karst regions to research the mechanism of karst rocky desertification(KRD)expansion.Whether the large-scale KRD in southwestern China is caused by climate change or human activities is still controversial.In this study,the evolution of the KRD in southwestern China over the past 2000 years was reconstructed through the high-precisionδ^(13)C record of stalagmites from Shijiangjun(SJJ)Cave,Guizhou Province,China.Theδ^(13)C of the stalagmites from SJJ Cave exhibited heavy values from the Medieval Warm Period(MWP)to the Little Ice Age(LIA).Furthermore,theδ^(13)C records of other stalagmites and tufa from southwestern China also showed the same significant heavy trend.Because the stalagmiteδ^(13)C could record the change of ecological environment,it indicated that the consistent change of the stalagmitesδ^(13)C may record the process of KRD expansion in the karst regions of southwestern China.During the MWP,the stronger Asian summer monsoon and the northward movement of the rain belt led to a dry period in southwestern China and a wet period in northern China.In contrast,it was wet in southwestern China and dry in northern China during the LIA.In addition,after the Jing-Kang event(JK event,AD1127)occurred at the end of the Northern Song dynasty,the political and economic center of China migrated to southern China for the first time,which changed the population distribution pattern of larger population in the north and smaller population in the south.Therefore,the expansion of KRD in southwestern China was exacerbated in the MWP due to the change of climate in southwestern China,the migration of a large number of people,wars,the large-scale reclamation of arable land,and the cultivation of large areas of crops.

关键词： Karst rocky desertification Jing-Kang event Stalagmiteδ13C record Medieval Warm Period Little Ice Age

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

Changes in vegetation and moisture in the northern Tianshan of China over the past 450 years

引用

Frontiers of Earth Science 2020年第2期14卷 479-491页

作者： Weihe REN Yan ZHAO Quan LI Jianhui CHEN Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of West China’s Environmental System(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

Knowledge of historical changes in moisture within semi-arid and arid regions is the basis of climatic change predictions and strategies in response to long-term drought.In this study,a multiproxy peat record with highresolution from Sichanghu in the northern Tianshan was used to document the changes in vegetation and climate over the past 450 years in the arid Central Asia.The pollen,grain size,and loss on ignition(LOI)records indicate that the productivity of local peat began to increase at^1730 AD.The vegetation in the Sichanghu area experienced several transitions,from temperate desert to dense desert,marsh meadow,and steppe desert vegetation.The climate in the study area was extremely dry during the early stages of the Little Ice Age(LIA)(before 1730 AD)and relatively wet during the late stages(1730–1880 AD).The inferred changes in the moisture conditions of the Sichanghu peatland since the LIA may have been controlled by the extent of Arctic sea ice,the North Atlantic Oscillation,and the Siberian High via the connections of large-scale atmospheric circulations such as the Westerlies.

关键词： Little Ice Age pollen vegetation change moisture condition Tianshan arid Central Asia

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

Aeolian activity in the southern Gurbantunggut Desert of China during the last 900 years

引用

Journal of Arid Land 2023年第6期15卷 649-666页

作者： LI Wen MU Guijin YE Changsheng XU Lishuai LI Gen Key Laboratory for Digital Land and Resources of Jiangxi Province East China University of TechnologyNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China College of Resources and Environment Shanxi Agricultural UniversityJinzhong 030801China

The mineral dust emitted from Central Asia has a significant influence on the global climate system.However,the history and mechanisms of aeolian activity in Central Asia remain unclear,due to the lack of well-dated records of aeolian activity and the intense wind erosion in some of the dust source areas(e.g.,deserts).Here,we present the records of aeolian activity from a sedimentary sequence in the southern Gurbantunggut Desert of China using grain size analysis and optically stimulated luminescence(OSL)dating,based on field sampling in 2019.Specifically,we used eight OSL dates to construct chronological frameworks and applied the end-member(EM)analysis for the grain size data to extract the information of aeolian activity in the southern Gurbantunggut Desert during the last 900 a.The results show that the grain size dataset can be subdivided into three EMs(EM1,EM2,and EM3).The primary modal sizes of these EMs(EM1,EM2,and EM3)are 126.00,178.00,and 283.00μm,respectively.EM1 represents a mixture of the suspension components and saltation dust,while EM2 and EM3 show saltation dust transported over a shorter distance via strengthened near-surface winds,which can be used to trace aeolian activity.Combined with the OSL chronology,our results demonstrate that during the last 900 a,more intensive and frequent aeolian activity occurred during 450-100 a BP(Before Present)(i.e.,the Little Ice Age(LIA)),which was reflected by a higher proportion of the coarse-grained components(EM2+EM3).Aeolian activity decreased during 900-450 a BP(i.e.,the Medieval Warm Period(MWP))and 100 a BP-present(i.e.,the Current Warm Period(CWP)).Intensified aeolian activity was associated with the strengthening of the Siberian High and cooling events at high northern latitudes.We propose that the Siberian High,under the influence of temperature changes at high northern latitudes,controlled the frequency and intensity of aeolian activity in Central Asia.Cooling at high northern latitudes would have significantly enhanced the Siberian High,causing i

关键词： aeolian activity grain size wind regime Little Ice Age Siberian High climatic drying Central Asia

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

Quantifying temporal changes in Tornionjoki river ice breakup dates and spring temperatures in Lapland since 1802

引用

Journal of Geographical Sciences 2013年第6期23卷 1069-1079页

作者： Samuli HELAMA Jianmin JIANG Johanna KORHONEN Jari HOLOPAINEN Mauri TIMONEN Finnish Forest Research Institute Rovaniemi Northern Unit 96300 Finland Training Centre of China Meteorological Administration Beijing 100081 China Finnish Environment Institute Helsinki P.O. Box 140 00251 Finland Department of Geosciences and Geography University of Helsinki Helsinki P.O. Box 64 00014 Finland

Cryophenological records （i.e. observational series of freeze and breakup dates of ice） are of great importance when assessing the environmental variations in cold regions. Here we employed the extraordinarily long observational records of river ice breakup dates and air temperatures in northern Fennoscandia to examine their interrelations since 1802. Historical observations, along with modern data, comprise the informational setting for this analysis carried out using t-test. Temperature history of April-May season was used as cli- matic counterpart for the breakup timings. Both records （temperature and breakup） showed seven sub-periods during which their local means were distinctly different relative to preced- ing and subsequent sub-periods. The starting and ending years of these sub-periods oc- curred in temporal agreement. The main findings of this study are summarized as follows：（1） the synchrony between the temperature and river ice breakup records ruled out the possibility that the changes would have occurred due to quality of the historical series （i.e. inhomoge- neity problems often linked to historical time-series）; （2） the studied records agreed to show lower spring temperatures and later river ice breakups during the 19th century, in comparison to the 20th century conditions, evidencing the prevalence of cooler spring temperatures in the study region, in agreement with the concept of the Little Ice Age （1570-1900） climate in North-West Europe; （3） the most recent sub-period demonstrate the highest spring tem- peratures with concomitantly earliest river ice breakups, showing the relative warmth of the current springtime climate in the study region in the context of the past two centuries; （4） the effects of anthropogenic changes in the river environment （e.g. construction and demolition of dams） during the 20th century should be considered for non-climatic variations in the breakup records; （5） this study emphasizes the importance of multi-centurial （i.e. historical） cryo- phenological information fo

关键词： climatic change historical climatology Lapland Little Ice Age phenology

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

Climatic differences and similarities between Indian and East Asian Monsoon regions of China over the last millennium:a perspective based mainly on stalagmite records

Climatic differences and similarities between Indian and Eas...

引用

中国科学院地质与地球物理研究所2007学术年会

作者： Ming Tan 1 Research Fellow,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,China

Tan M.2007.Climatic differences and similarities between Indian and East Asian Monsoon regions of China over the last millennium: a perspective based mainly on stalagmite records.International Journal of Speleology,36(2),75-81 Bologna(Italy).ISSN 0392- 6672 Cave sediments,especially stalagmites,have been providing absolute dated climate records that can extend from the present to over 500,000 years ago.Based on the reconstructed temperature time series,a comprehensive overview of the climatic differences and similarities between the Indian and the East Asian Monsoon regions of China over the last millennium is presented.Evidence from accurately dated and high-resolution records including stalagmites,ice cores and tree rings show that there was a"Medieval Warm Period"(around 1000 to 1400 AD) in north and east China where climate is dominated by the East Asian monsoon;whilst no such interval is evident in the records including stalagmites and ice cores from southwest China where climate is dominated by the Indian monsoon.However,both regions underwent a significant cooling during the Little Ice Age(around the mid 1500s to the 1800s). The result achieved here may allow a possibility of distinguishing the boundary between Indian monsoon and East Asian monsoon regions over the last millennium with increase of climate records,especially stalagmites that are mostly suitable for accurate U/Th dating and/or lamina counting.

关键词： climate China stalagmite ice core tree ring Medieval Warm Period Little Ice Age Indian monsoon East Asian monsoon

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

Absence of the Impact of the Flux of Cosmic Rays and the Cloud Cover on the Energy Balance of the Earth

引用

Journal of Atmospheric Science Research 2020年第3期3卷 1-7页

作者： H.I.Abdussamatov Pulkovo Observatory of the RAS St.Petersburg196140Russia

The energy of solar radiation absorbed by the Earth,as well as the thermal radiation of the Earth’s surface,which is released to the space through the atmospheric transparency window,depends on variations of the area of the cloud cover.Svensmark et al.suggest that the increase in the area of the cloud cover in the lower atmosphere,presumably caused by an increase in the flux of galactic cosmic rays during the quasi-bicentennial minimum of solar activity,results only in an increase in the fraction of the solar radiation reflected back to the space and weakens the flux of the solar radiation that reached the Earth surface.It is suggested,without any corresponding calculations of the variations of the average annual energy balance of the EarthЕ,that the consequences will include only a deficit of the solar energy absorbed by the Earth and a cooling of the climate up to the onset of the Little Ice Age.These suggestions ignore simultaneous impact of the opposite aspects of the increase in the area of the cloud cover on the climate warming.The latter will result from a decrease in the power of thermal radiation of the Earth’s surface released to the space,and also in the power of the solar radiation reflected from the Earth’s surface,due to the increase in their absorption and reflection back to the surface.A substantial strengthening in the greenhouse effect and the narrowing of the atmospheric transparency window will also occur.Here,we estimate the impact of all aspects of possible long-term 2%growth of the cloud cover area in the lower atmosphere byЕ.We found that an increase in the cloud cover area in the lower atmosphere will result simultaneously both in the decrease and in the increase in the temperature,which will virtually compensate each other,while the energy balance of the Earth E before and after the increase in the cloud cover area by 2%will stay essentially the same:E1-E0≈0.

关键词： Climate Cosmic rays Cloud Cover Energy Balance Little Ice Age Solar Irradiance Greenhouse Effect Atmospheric Transparency Window

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

Global mean temperature changes during the last millennium

引用

Progress in Natural Science:Materials International 2002年第12期 42-46页

作者： GONG Daoyi Beijing 100875 Bering Normal University China Key Laboratory of Environ-mental Change and Natural Disaster

A synthetic study is made on the global or hemispheric mean temperature series for the last millennium worked out by Mann et al., Jones et al,, Crowley and Lowery, and Briffa. The global mean temperature series reconstructed by using proxy data at 30 sites by Wang et al. and simulations from AD 1000 to 2000 by energy balance model are described and compared with the series of others. Wang’s series gives greater variability and shows the highest correlation coefficient (0. 83) with the simulation results. Uncertainties in the reconstructions and simulations are discussed. The errors in reconstructing a global mean temperature series according to 30 sites as used in the research are estimated. Wang s series indicate that temperature average for the 11th century is higher than the mean of the last millennium. It infers that the Medieval Warm Period predominated to some extent over the globe. However, the 20th century is no doubt the warmest century during the last millennium.

关键词： last millennium temperature changes Medieval Warm Period Little Ice Age modern climate warming.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Medieval Warm Period drought recorded in Lake Huguangyan,tropical South China

The Medieval Warm Period drought recorded in Lake Huguangyan...

引用

中国科学院地质与地球物理研究所2002学术年会

作者： Guoqiang Chu~a,Jiaqi Liu~a,Qing Sun~b,Houyuan Lu~a,Zhaoyan Gu~a, Wenyuan Wang~c,and Tungsheng Liu~a a Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,China b.The Geological Analysis Center,Beijing,China c.The Administrative Center for China’s agenda 21th Century,Beijing,China

The geochemistry of dated sediment cores from Huguangyan lake(21°9′N,110°17′E), tropical South China,reveals distinct stratigraphical patterns in organic and inorganic carbon(TOC, TIC),biogenic silica(BS),and total nitrogen(TN) over the past 1400 years.In this hydrologically closed lake,TIC variations may reflect changes in the precipitation/evaporation ratio,which controls the evaporative enrichment of carbonate.TOC,BS and TN in the sediment are proxy indicators of lake productivity and nutrient input,which we believe are linked to local precipitation.High TIC content correlates with low concentrations of TOC,BS,and TN,and indicates two drought episodes dated to AD 670-760 and AD 880-1260 in the sediments of lake Huguangyan.Local historical chronicles support these data,suggesting that the climate of tropical South China was dry during the Medieval Warm Period(MWP) and wet during the Little Ice Age(LIA).The detected MWP drought is temporally correlated with evidence for lower precipitation on the Guliya(China) and Quelccaya (Peru) ice caps,and with increased salinity in Moon Lake(USA Great Plains).

关键词： paleoclimate China Medieval Warm Period Little Ice Age drought.Monsoon and Civilization

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

在线全文

在线全文

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

在线全文

在线全文

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：