河西走廊一次强沙尘暴过程的干侵入分析   总被引：2，自引：2，他引：0  

王伏村  邵亮  郭良才  付有智  张悦 《干旱气象》2008,26(2):30-35

使用NCEP(1°×1°)每天4次的再分析资料对2006年4月9~10日发生在甘肃省河西走廊的一次强沙尘暴天气进行了诊断分析。结果表明:这次强沙尘暴天气有明显的干侵入特征,对流层中高层高位势涡度,干空气在西北气流引导下,沿等熵面入侵到边界层;干侵入使对流层低层产生高位涡扰动、锋面气旋环流加强、低空急流形成、边界层辐合增强,从而引发了这次强沙尘暴天气。  相似文献   

Convergent development of experimental landforms with differing rainfall and substrate properties     

Shunji Ouchi 《地球表面变化过程与地形》2021,46(5):1083-1095

Four runs of experimental landform development, with the same uplift rate, different rainfall intensity, and the same material of different permeability adjusted by the degree of compaction, showed complicated effects of rainfall and mound-forming material. In the run with more rainfall on less permeable material, low separated ridges developed in the uplifted area, because abundant overland flow promoted valley erosion and slope processes from early stages. In the run with less rainfall on less permeable material, valley incision proceeded mostly in major valleys where surface water converges. Canyons developed during early stages and later a high massive mountain emerged. The effect of rainfall difference, however, appeared completely opposite on more permeable material accompanied by lower shear strength. In the run with more rainfall on more permeable material, a massive mountain similar to that with less rainfall on less permeable material appeared, and low separated ridges appeared in the run with less rainfall on more permeable material as in the run with more rainfall on less permeable material. In the former case, similar amount of water available for Hortonian overland flow in early stages estimated from rainfall rate and permeability can explain the development of similar landforms. In the latter case, while abundant surface water with more rainfall on less permeable material made fluvial erosion active from early stages, the deficiency in surface water with less rainfall on more permeable material apparently attenuated fluvial erosion but possibly accentuated slope processes and slope failures by seepage water flow through more permeable material of low shear strength. The active erosion from early stages apparently resulted in the development of enduring similar low landforms later in the dynamic equilibrium stage. These experimental results indicate that similar landforms can emerge from different environmental and lithologic controls, and that process does not necessarily follow from form.  相似文献   

大兴安岭北段巴升河岩体锆石U-Pb年代学及其地质意义     

陈会军  崔天日  钱程  李林川  陈井胜  李伟  吴新伟  江斌  司秋亮  秦涛  唐振  张渝金  郭威 《地质与资源》2019,28(5):405-412

大兴安岭北段扎兰屯地区巴升河岩体由碱长花岗岩组成.采用LA-ICP-MS方法对碱长花岗岩开展锆石U-Pb测年,结果为297.8±3.6 Ma,岩体形成于早二叠世.该岩体4个样品的全岩地球化学等特征显示：巴升河岩体中碱长花岗岩具有富Si、高K、富碱的特征,属于弱过铝质钾玄岩系列,同时,样品∑REE偏高,Eu负异常明显,富集大离子亲石元素,具有A型花岗岩特征,综合前人研究成果及同位素年代学特征,认为兴安地块与松嫩地块拼合的时间早于298 Ma.  相似文献   

Research progress and prospect on development geography     

Deng  Xiangzheng  Jin  Gui  He  Shujin  Wang  Chengxin  Li  Zhaohua  Wang  Zhanqi  Song  Malin  Yang  Qingyuan  Zhang  Anlu  Chen  Jiancheng 《地理学报(英文版)》2021,31(3):437-455

In this paper,we review the research progress in development geography since the 20th century,focusing on its connotation and theory,fields,methods,and development trends.Specifically,we systematically review the research and applications of development geography,comprising fields such as the convergence of underdeveloped countries and re-gions,and the convergence of the process of improving the quality of life in developed coun-tries and regions.Then,based on an analysis of research progress in development geogra-phy in foreign countries,we examine the development conditions and disciplinary advantages of development geography in China.Further,we highlight that future development geography research in China should focus on the latest international academic research and China's national macro-strategic needs.Future research in development geography should be guided by the theory of sustainable development,the core of which is to improve sustainable liveli-hood capacity and regional green development levels in underdeveloped regions.This core includes the construction of industrial policy and development geography theory,as well as an interdisciplinary integrated research system.The focus must be placed on researching the spatial patterns,diffusion characteristics,and the convergence mechanism of regional de-velopment.Such a focus will facilitate exploration of the regulatory policies and scientific paths that serve regional economic construction and industrial development.  相似文献   

Contrasting Regional Responses of Indian Summer Monsoon Rainfall to Exhausted Spring and Concurrently Emerging Summer El Ni?o Events     

E.K.KRISHNA KUMAR  S.ABHILASH  SANKAR SYAM  P.VIJAYKUMAR  K.R.SANTOSH  A.V.SREENATH 《大气科学进展》2023,40(4):697-710

The inverse relationship between the warm phase of the El Ni?o Southern Oscillation(ENSO) and the Indian Summer Monsoon Rainfall(ISMR) is well established. Yet, some El Ni?o events that occur in the early months of the year(boreal spring) transform into a neutral phase before the start of summer, whereas others begin in the boreal summer and persist in a positive phase throughout the summer monsoon season. This study investigates the distinct influences of an exhausted spring El Ni?o(springtime)...  相似文献   

Circulation Patterns Linked to the Positive Sub-Tropical Indian Ocean Dipole     

Chibuike Chiedozie IBEBUCHI 《大气科学进展》2023,40(1):110-128

The positive phase of the subtropical Indian Ocean dipole(SIOD) is one of the climatic modes in the subtropical southern Indian Ocean that influences the austral summer inter-annual rainfall variability in parts of southern Africa. This paper examines austral summer rain-bearing circulation types(CTs) in Africa south of the equator that are related to the positive SIOD and the dynamics through which specific rainfall regions in southern Africa can be influenced by this relationship. Four austral...  相似文献   

GNSS观测值统一表达及组合PPP解算性能分析     

张翠英  赵兴旺 《测绘科学技术学报》2017,34(1)

针对GNSS多系统组合进行PPP定位的问题,推导了GNSS观测值统一表达式;进而给出了基于UofC模型的多系统组合PPP的函数模型和随机模型;最后采用6个IGS观测站24 h观测数据对7种组合模型的PPP进行解算,并从收敛率、收敛速度和定位精度等方面进行了统计分析。实验结果表明,当观测时长为60 min时,GPS/GLONASS/BDS组合PPP收敛性能最好,收敛率为91.7%,平均收敛时间为16.1 min;而BDS PPP收敛性能最差,收敛率仅为32.7%,平均收敛时间为38.4 min。可见,多系统组合有利于提高精密单点定位的解算性能。对于定位精度,在观测时长较短时(如0.5 h),GPS/GLONASS/BDS组合PPP整体上具有最优的定位精度,(N,E)方向偏差和标准差分别为(0.3,0.5)cm和(1.9,4.3)cm;短时间内对流层参数与垂直方向的强相关性,将致使U方向精度较差。  相似文献   

Voronoi邻近关系支持下的点模式趋同提取方法     

康顺  李佳田  武昊 《测绘学报》2017,46(5):649-657

点模式及其趋同研究是揭示地学现象的产生、发展与演变,量化空间相似性分布、诠释空间分布成因的重要方式。目前,点模式研究侧重于已知频率与随机分布的一元独立性检验、距离测度下单观测值的二元相关性分析,而针对集聚过程相关性,空间拓扑与非拓扑邻近、综合多观测值的点模式趋同量化研究顾及不足。据此,以空间邻近性聚类、局部相关的多指标评价为切入点,本文提出了一种Voronoi邻近关系支持下的点模式趋同提取方法。首先,以Voronoi邻近相关表集聚算法剖分出空间独立性点模式;其次,依据Voronoi邻近关系指数测度、样本分布均值与分布方差的趋同假设,使用拉普拉斯平滑算子评价趋同度;最后,依据λ截矩阵,提取出Voronoi邻近、非Voronoi邻近关系支持下的强趋同点模式。试验以云南省腾冲市居民点数据为算例,经与点模式构建的聚类方法对比、趋同度计算与强趋同提取,验证了该方法的可行性与有效性。  相似文献   

一种加快BDS精密单点定位初始化的方法     

杨克凡  柴洪洲  潘宗鹏 《测绘工程》2017,26(6)

由于BDS卫星的星座特性及卫星的轨道和钟差的精度影响,使得传统消电离层组合精密单点定位(PPP)的初始化时间较长。针对上述问题,文中对附加电离层约束的非组合精密单点定位算法进行研究。首先介绍非组合PPP算法,分析其与传统PPP的差异;其次分别利用CODE电离层格网产品,以反距离加权算法计算的站星电离层延迟、低阶球谐函数建立的区域电离层产品等作为先验信息对非组合PPP进行约束。通过MGEX观测网实测数据静态和仿动态计算表明,相比传统消电离层组合PPP,附加电离层约束的非组合PPP能够有效缩短初始化时间,同时能够获得高精度的定位结果。  相似文献   

多卫星系统融合精密单点定位性能分析     

杨松  张显云  杜宁  鲍新雪  刘芳诚 《测绘工程》2017,26(6)

随着全球四大卫星导航系统格局的成型,卫星定位系统已从单系统模式发展为如今多系统、多频率融合定位、交互操作的模式。在分析多系统精密单点定位模型及各误差项处理策略的基础上,利用RTKLIB进行GPS,GLONASS,GALILEO,BDS多系统融合精密单点定位试验,并分析其动/静态定位性能。实验结果表明:在单系统空间几何构型较差的情况下,多系统融合精密单点定位较单GPS定位精度可提高20%~40%,收敛时间可缩短35%~50%;在截止高度角超过40°的情况下,单系统会因可见卫星数量不足而无法完成连续定位,而多系统仍能实现高精度的连续定位。这在城区、山区或卫星遮蔽较严重的不利环境中有重要的利用价值。  相似文献