沿江与沿桥城市发展对比研究     

赵一如  姚建华 《地域研究与开发》2000,19(3):21-25

沿江产业带和沿桥经济带同是横跨我国东、中、西三大地带的经济建设的的级轴线,其城市经济发展状况存在很大差异。文章通过对二者的城市等级规模、空间结构、城市化程度及积能结构等方面进行具体的差异比较,对导致才者差异的主观及客观原因进行深入分析,提出了几点适合陆桥知身特点,结合陆桥现有机遇的具体建议。  相似文献   

PJ和MnE遥相关型对东亚夏季气温的协同影响（英文）          下载免费PDF全文

MING Jing  SUN Jianqi  YU Shui 《大气和海洋科学快报》2019,(3):208-217

本文研究发现太平洋–日本遥相关型(PJ)和地中海–欧亚北部遥相关型(MnE)对东亚夏季气温存在显著的协同影响。当PJ和MnE处于同位相时,两者相关的大气环流在东亚中部地区相互叠加抵消,从而对该地区气温的影响较弱,而此时显著的气温异常主要位于东亚北部。相反,当PJ和MnE处于反位相时,两者相关的大气环流在东亚地区相互叠加增强,从而对东亚中部和亚洲北部地区的气温产生显著影响。因此,在东亚夏季气温变化的理解与预测中需要考虑这两个遥相关的协同作用。  相似文献   

1—3月欧亚大陆热力变化及其与中国降水的关系   总被引：1，自引：1，他引：0       下载免费PDF全文

晏红明  王灵  李蕊 《应用气象学报》2016,27(2):209-219

利用1979—2011年NCEP/NCAR再分析资料、我国160个站降水和气温资料,分析欧亚大陆热力变化特征,其在冬季和春季的气候变率最明显,且南北区域呈反相差异。在此基础上, 探讨1—3月欧亚大陆热力差异与中国降水异常的关系,欧亚大陆正 (负) 热力差异年,1—3月华南、西南至河套西部地区降水偏多 (少) 明显,后期夏季多雨带位于长江中下游地区 (华南地区)。大气环流异常特征显示:1—3月欧亚大陆南北热力差异与同期北极涛动 (AO)、东亚大槽、东亚高空急流等大尺度大气环流,以及后期东亚高空急流、南亚高压、低层季风风系异常的密切相关是欧亚大陆热力变化与中国降水联系的可能途径。  相似文献   

欧亚大陆及西太平洋边缘海地区瑞雷波群速度结构与各向异性分布   总被引：1，自引：0，他引：1       下载免费PDF全文

顾勤平  朱介寿  康清清  程先琼  边立恩 《地震学报》2010,32(1):12-22

根据欧亚大陆及西太平洋地区102个数字化台站记录的近万次地震事件的长周期垂直向瑞雷波资料,利用时频分析方法测量并筛选后共得到11213条质量较高的基阶瑞雷波群速度频散资料.纯路径频散的反演中同时计算方位各向异性,反演获得了欧亚大陆及西太平洋边缘海地区(10°E—150°E,10°S—80°N)8—200s共28个周期的瑞雷波群速度及各向异性空间分布图象.瑞雷波高分辨率层析成像表明,30—60s周期,以青藏高原为中心呈极低速分布;100—120s周期,速度差异幅度较大,在东亚东部及西太平洋边缘海,自北向南显示出一条宽2500—4000km,长约8000km的巨型低速异常带.相对海洋来说,欧亚大陆各向异性强度较弱且快波方向较复杂.由于受到印度板块与欧亚板块的碰撞,中国大陆西部的各向异性强度明显大于东部.  相似文献   

欧亚500 hPa环流、雪盖和中国降水量3—4年耦合振荡   总被引：1，自引：0，他引：1  

杨秋明 《气候与环境研究》1997,2(4):347-355

{{@ convertAbstractHtml(article.abstractinfoCn, "cn")}}   {{if article.graphicalAbstractinfoCn && article.graphicalAbstractinfoCn != ""}}{{@ article.graphicalAbstractinfoCn}}{{/if}}  相似文献   

Marginal basins of the NW Pacific and Eastern Eurasia     

Weiwei Ding 《International Geology Review》2020,62(7-8):781-788

ABSTRACT

The broad zone between old oceanic lithosphere of the NW Pacific and Eastern Eurasian continental lithosphere is home to a chain of marginal basins. Different from oceans, marginal basins are more influenced by the underlying subduction zone both geophysically and geochemically and are more likely to be blanketed by sediments from the nearby continent. This special issue collects 19 papers that explore the tectonic, magmatic, sedimentary and fluid activity features of marginal basins during rifting, spreading and post-spreading stages. Most papers in this special issue focus on South China Sea marginal basins, where abundant research provides interesting insights into how marginal sea basins evolve. Because South China Sea basins are fully evolved and their key features have not been overprinted by younger deformation, the results of this special issue are very useful for understanding the evolution of other marginal basins.  相似文献   

Oxygen isotope measurements of mammoth and reindeer skeletal remains: an archive of Late Pleistocene environmental conditions in Eurasian Arctic     

L. Genoni  P. Iacumin  V. Nikolaev  Yu. Gribchenko  A. Longinelli   《Earth and Planetary Science Letters》1998,160(3-4):587-592

58 samples of fossil mammoth and reindeer teeth and bones of various ages and coming from different locations were studied for the oxygen isotopic composition of their phosphate. Samples from Siberia have interstadial (Marine Isotope Stage 3), stadial (MIS 2), late-glacial and post-glacial ages. Russian and Ukrainian samples refer to the late-glacial and transitional (between the interstadial and glacial stages) time. The δ¹⁸O of palaeoenvironmental waters were calculated from the δ¹⁸O_p obtained from fossil samples by means of the isotope equations calibrated on modern specimens of elephants and deer respectively. The δ¹⁸O_w obtained are generally lighter than those measured nowadays in the same areas and not far from those measured on ice cores of Holocene age, the isotopic differences being not greater than a few δ units. The calculated values are also in fairly good agreement with some isotopic values obtained from Siberian permafrost samples. According to the results obtained it seems that the elephant and deer equations can be reasonably used respectively in the case of fossil mammoth and deer skeletons to evaluate environmental palaeowaters.  相似文献   

以地图为基准的亚欧大陆地理内心及其区域旅游开发环境     

刘琳  胡毓钜 《干旱区地理》1998,21(1):72-80

本文主要阐述了以下问题：1．亚欧大陆地理内心含义与研究目的;2．以地图为基准的大陆内心测算方法;3．测算结果精度分析;4．内心辐射区的多层结构;5．内心地与内心区旅游开发环境。  相似文献   

亚欧大陆内心区旅游资源分区评述     

乔木  刘琳 《干旱区地理》1998,21(1):81-86

本文根据亚欧大陆内心区旅游资源分布特点以及开发利用程度、旅游资源的地域分异性及自然和人文条件的差异,在内心区划分出不同的旅游亚区,并进行旅游资源分区评述,提出今后的开发设想。  相似文献   

Scenarios of land cover in Eurasia under climate change   总被引：1，自引：1，他引：1  

Fan  Zemeng  Bai  Ruyu  Yue  Tianxiang 《地理学报(英文版)》2020,30(1):3-17

The method for surface modelling of land cover scenarios(SMLCS) has been improved to simulate the scenarios of land cover in Eurasia. On the basis of the observation monthly climatic data observed from 2127 weather stations in Eurasia during 1981–2010, the climatic scenarios data of RCP26, RCP45 and RCP85 scenarios released by CMIP5, and the land cover current data of Eurasia in 2010, the land cover scenarios of Eurasia were respectively simulated. The results show that most land cover types would generally have similar changing trends in the future, but with some difference in different periods under the three scenarios of RCP26, RCP45 and RCP85. Deciduous needleleaf forest, mixed forest, shrub land, wetlands and snow and ice would generally decrease in Eurasia during 2010–2100. Snow and ice would have the fastest decreasing rate that would decrease by 37.42% on average. Shrub land would have the slowest decreasing rate that would decrease by 5.65% on average. Water bodies would have the fastest increasing rate that would increase by 28.78% on average. Barren or sparsely vegetated land would have the slowest increasing rate that would increase by 0.76%. Moreover, the simulated results show that climate change would directly impact on land cover change in Eurasia.  相似文献