Secondary planetary waves in the middle atmosphere: numerical simulation and analysis of the neutral wind data     

《Journal of Atmospheric and Solar》2002,64(8-11):1251-1261

A numerical simulation of secondary waves generated by nonlinear interaction has been used to interpret the behaviour of planetary waves observed by a meteor radar in the UK (53°27′N, 1°35′W) during the summer of 1992. A new explanation is proposed for the long-period variability of the (3,0) mode quasi-two-day wave in the mesosphere and lower-thermosphere, involving the (2,0) Rossby-gravity mode and pseudo-two-day secondary waves with the same zonal wavenumbers as those of the primary (2,0) and (3,0) modes. These pseudo-two-day secondary waves arise from the nonlinear interaction of the Rossby-gravity modes with long-period oscillations of the zonally averaged flow in the equatorial stratosphere, which can be generated by the interaction between the 10 and 16 day planetary waves. Other maxima existing in the neutral wind power spectra can be identified with various secondary waves originating from nonlinear interaction between the quasi-two-day and long-period planetary waves.  相似文献   

Glacial-interglacial changes in dust deposition on the Chinese Loess Plateau     

《Quaternary Science Reviews》2003,22(18-19):1859-1878

The Chinese Loess Plateau (CLP) contains an extensive record of aeolian deposition through multiple glacial–interglacial cycles. Independent chronologies based on pedostratigraphy, magnetic susceptibility, radiocarbon and luminescence dating were developed for 79 sites and used to estimate aeolian mass accumulation rates (MARs) for marine isotope stages 1–5. The regional median value of MAR for Stage 2 is 310 g/m²/yr compared to an estimate of 65 g/m²/yr for Stage 5. Estimated MARs from individual sites for Stage 2 are approximately 4.3 times greater than MARs for Stage 5 and 2.1 times greater than for Stage 1. MAR values at individual sites are consistently highest in the northwest and lowest in the southwest of the CLP during all marine isotope stages. MARs estimated on sections through loess terraces are consistently higher than MAR estimates at other sites, indicating that local recycling of loess material from exposed river valley deposits has been significant throughout the last 130 kyr. Although the spatial and temporal patterns in MAR are robust, there are uncertainties about the magnitude of these changes due to (a) lack of bulk density measurements and uncertainties in the chronologies for individual sites, (b) site and chronological biases in the sampling used to derive regional estimates, and (c) the unquantified nature of human impact on accumulation rates during the late Holocene. Nevertheless, the records from the CLP pose a number of challenges which could be addressed by numerical models of the palaeo-dust cycle.  相似文献   

Winnie(1997)和Bilis(2000)变性过程的湿位涡分析   总被引：37，自引：8，他引：29  

李英  陈联寿  雷小途 《热带气象学报》2005,21(2):142-152

9711号台风Winnie和0010号台风Bills均在中国大陆发生变性,但前者变性后再度加强,而后者变性后减弱消亡。从湿位涡理论出发,对比分析两者的变性过程,结果表明：作为变性台风,Winnie和Bilis均在北上过程中与中纬度西风槽发生作用,但前者与高空槽发生耦合,后者仅接近高空槽底部,没有发生耦合;Winnie变性加强过程表现为一个温带气旋在低层锋区上的强烈发展过程,主要与高层正位涡扰动下传、低层锋区及热带气旋低压环流之间的相互作用有关。Pm湿斜压项增长引起的倾斜涡度发展是登陆热带气旋变性加强的主要因子。在Bills变性过程中,高层无明显的正位涡扰动下传,热带气旋低压环流内无锋区面出现,大气斜压性弱且变化不明显。  相似文献   

黄河贵德段河流阶地及演变研究   总被引：1，自引：0，他引：1  

苗琦  钱方  赵志中  刘晓刚 《华北地质》2012,(1):34-38

贵德盆地作为青藏高原东北部的一个构造地貌单元,处于黄河上游中段,盆地中河流阶地发育,但是阶地的形成时代仍存在很大争议.选择贵德盆地黄河阶地作为研究对象,并从龙羊峡至松坝峡共采集阶地ESR测年样品10个,进行了年代测试,结果表明贵德盆地新构造运动具有间歇性、差异性特征.笔者还并分析了黄河贵德段演变特征  相似文献   

北大巴山凤凰山岩体锆石U Pb LA ICP MS年龄及其构造意义   总被引：1，自引：0，他引：1  

李建华  张岳桥  徐先兵  董树文  李廷栋 《地质论评》2012,58(3):581-593

北大巴山凤凰山岩体是扬子陆块北缘典型的新元古代侵入岩群,对采自岩体的6个花岗岩(闪长岩)样品进行了LA-ICP-MS锆石U-Pb同位素定年分析。定年数据显示,岩浆活动可分为早期(797±6Ma)、中期(770±6Ma、774±5Ma)、晚期(755±6Ma、750±13Ma和743±6Ma)三个阶段,证实凤凰山岩体为多期岩浆侵入形成。这几期岩浆活动在扬子陆块具同步性和普遍性,广泛被记录在黄陵、汉南等其它新元古代杂岩中。凤凰山花岗岩完整记录了扬子陆块北缘南华纪初期的区域拉张—裂陷事件,其形成可能与导致Rodinia超大陆裂解作用的幕式地幔柱活动有关。本次研究对认识扬子陆块新元古代地壳生长与再造过程及Rodinia超大陆裂解机制具有重要意义。  相似文献   

AN ANALYSIS OF THE APPLICABILITY OF FUZZY CLUSTERING IN ESTABLISHING AN INDEX FOR THE EVALUATION OF METEOROLOGICAL SERVICE SATISFACTION     

闫敏慧  姚秀萍  王蕾  姜丽霞  张金峰 《热带气象学报(英文版)》2020,26(1):103-110

An evaluation index is a prerequisite for scientific evaluation of a public meteorological service. This paper aims to explore a technical method for determining and screening evaluation indicators. Based on public satisfaction survey data obtained in Wafangdian (China) in 2010, this study investigates the suitability of the fuzzy clustering analysis method in establishing an evaluation index. Through quantitative analysis of multilayer fuzzy clustering of various evaluation indicators, correlation analysis indicates that if the results of clustering were identical for two evaluation indicators in the same sub-evaluation layer, then one indicator could be removed, or the two indicators merged. For evaluation indicators in different sub-evaluation layers, although clustering reveals attribute correlations, these indicators may not be substituted for one another. Analysis of the applicability of the fuzzy clustering method shows that it plays a certain role in the establishment and correction of an evaluation index.  相似文献   

Assimilation of temperature and salinity using isotropic and anisotropic recursive filters in Tropic Pacific     

LIU Ye  ZHAO Yanling 《海洋学报(英文版)》2011,30(1):15-23

A data assimilation scheme used in the updated Ocean three-dimensional Variational Assimilation System (OVALS),OVALS2,is described.Based on a recursive filter (RF) to estimate the background error covariance (BEC) over a predetermined scale,this new analysis system can be implemented with anisotropic and isotropic BECs.Similarities and differences of these two BEC schemes are briefly discussed and their impacts on the model simulation are also investigated.An idealized experiment demonstrates the ability of the updated analysis system to construct different BECs.Furthermore,a set of three years experiments is implemented by assimilating expendable bathythermograph (XBT) and ARGO data into a Tropical Pacific circulation model.The TAO and WOA01 data are used to validate the assimilation results.The results show that the model simulations are substantially improved by OVALS2.The inter-comparison of isotropic and anisotropic BEC shows that the corresponding temperature and salinity produced by the anisotropic BEC are almost as good as those obtained by the isotropic one.Moreover,the result of anisotropic RF is slightly closer to WOA01 and TAO than that of isotropic RF in some special area (e.g.the cold tongue area in the Tropic Pacific).  相似文献   

副热带一热带太平洋密跃层水量交换年际变化的模拟研究     

容新尧  张人禾  苏京志 《海洋学报》2011,33(5):9-22

利用一个全球海洋环流模式在3组风应力资料的强迫下模拟分析了副热带太平洋向热带太平洋密跃层水量输送的年际变化特征及其和风应力的关系,并设计数值试验,研究了密跃层水量输送的变化机制.结果表明,副热带太平洋向赤道太平洋的密跃层水量输送具有显著的年际变化.在年际时间尺度上,南北太平洋西边界密跃层水量输送都起着补偿内部路径输送的...  相似文献   

不同应力状态和摩擦系数对综合P波辐射花样影响的模拟研究   总被引：13，自引：8，他引：5       下载免费PDF全文

万永革  盛书中  许雅儒  吴逸民 《地球物理学报》2011,54(4):994-1001

为研究不同应力状态(包括主应力相对大小)和摩擦系数对大量地震P波初动辐射花样(综合P波辐射花样)的影响,首先给出了不同应力状态下的剪应力、摩擦应力和库仑破裂应力在断层面法向上的三维分布.表明即使在不考虑摩擦的情况下,剪应力在不同取向断层面上的分布也有很大差别,摩擦应力也在不同取向断层面上造成一定影响.其次,根据库仑破裂...  相似文献   

北半球温带气旋的模拟和预估研究Ⅱ:6个CMIP5耦合模式预估的未来RCP4.5情景下的变化     

张颖娴  丁一汇 《气象学报》2014,72(6):1171-1185

利用 CMIP5（Coupled Model Intercomparison Project Phase 5）的6个气候耦合模式中等排放情景———RCP4?5（典型浓度路径4?5）下的模拟结果对北半球温带气旋数目、风暴路径和强度的未来变化进行了研究分析。结果表明：（1）相对于20世纪后半叶,RCP4?5情景下的2053—2100年,虽然各模式的模拟结果存在一定的区域性差异,但共同显示了至21世纪末北半球整体温带气旋生成将减少,较低纬度减少得更显著。（2）模式较一致地模拟出未来北半球温带气旋的中心气压有降低的趋势,涡度强度将线性减弱。大多数的模式模拟得到北大西洋风暴轴未来将继续向极地偏移,但强度主要将减弱;过半的模式显示北太平洋风暴轴也将向极地偏移,强度变化则随季节的不同而不同。（3）6个模式的模拟结果均显示对流层中高层斜压区未来将向高层和高纬度扩展,南半球的变化更为显著。斜压区的变化在某种程度上反映了风暴轴的类似变化,因此, 这也支持了北太平洋和北大西洋风暴路径未来可能向极地偏移的结论。RCP4?5情景下北半球整体温带气旋活动将显著减少,但斜压区和风暴轴向高纬度的偏移将使较低纬度未来温带气旋活动减少得更为显著。  相似文献