郑州“7·20”特大暴雨极端性成因分析     

张入财  田金华  陈超辉 《气象与环境科学》2022,45(2):52-64

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抗差Vondrak滤波方法在内孤立波提取中的应用研究          下载免费PDF全文

张佳丽  张安民  孙朝辉  张学峰  张亮 《海洋学研究》2020,38(1):1-8

声学多普勒流速剖面仪(ADCP)是对海洋内波监测的有效手段,但受到仪器本身和复杂的海洋环境噪声等影响,走航式ADCP记录的海流数据存在大量噪声,且混有流速异常值。为了进一步提高海洋内孤立波的提取精度与准确性,本文针对走航式ADCP海流数据特点引入IGG3方法的权函数因子,设计了一种抗差Vondrak滤波器,并与快速傅里叶变换、小波分析和滑动平均3种传统滤波方法进行对比,以验证抗差Vondrak滤波方法的有效性与优越性。研究结果表明,抗差Vondrak滤波方法不仅可以有效地滤除流速噪声,还可以自适应剔除海流观测数据中的异常值,由其提取出的内孤立波准确且各层水平流速清晰。因此,与传统滤波方法相比,抗差Vondrak滤波方法在内孤立波提取方面具有一定的优越性。  相似文献   

智慧海洋国际共享应用平台发展趋势及其对策建议          下载免费PDF全文

孙朝辉  李兆钦  刘增宏 《海洋开发与管理》2020,37(1):3-9

当前,我国正在全面开展智慧海洋建设,各种新研发观测平台不断涌现,但是围绕智慧海洋的信息化建设仍显落后,在数据管理、质量控制方法和系统开发等方面与发达国家仍存在较大差距。文章通过分析国内外海洋共享应用平台的发展趋势及其特点,从数据管理方法、质量控制和系统设计开发等多个方面找出差距所在。研究表明,与国外相比,国内存在共享平台业务化运行不多的问题,为实现数据的规范化,并给出尽快制定针对不同观测平台数据管理规范、加强数据质量控制方法研究、加强具备专业知识的系统设计人才培养等建议。  相似文献   

Influence of ENSO Events on Tropical Cyclone Activity over the Western North Pacific     

LIU Zenghong  CHEN Xingrong  SUN Chaohui  CAO Minjie  WU Xiaofen  LU Shaolei 《中国海洋大学学报(英文版)》2019,(4)

Based on an analysis of 51-year(1965–2015) data, the influence of El Ni?o–Southern Oscillation(ENSO) events on tropical cyclone(TC) activity is examined over the western North Pacific(WNP). The total number of TCs formed in the entire WNP reduces by about 3.4 TCs per year in La Ni?a years, whereas TCs have an equivalent genesis number between El Ni?o years and climatology. During El Ni?o years, the frequency of TC formation increases remarkably in the southeast quadrant(140?E–180?, 0?–17?N) and decreases in the northwest quadrant(120?–140?E, 17?–30?N). During La Ni?a years, TCs tend to form in the northwest and southwest quadrants(120?–140?E, 0?–17?N) quadrants. TCs tend to become long-lived in the peak season(from July to September) of El Ni?o years and during strong El Ni?o events. TC genesis shows a southeastward positive shift in terms of lifetime and intensity during El Ni?o years, thus more super TCs(winds ≥ 58.64 m s-1) are formed in the southeast quadrant. Further analysis using the genesis potential index(GPI) indicates that the interannual variations in the TC genesis and track are significantly influenced by a combination of large-scale dynamic and thermodynamic conditions.  相似文献   

Kuroshio intrusion into the South China Sea with an anticyclonic eddy: evidence from underwater glider observation     

LIU Zenghong  CHEN Xingrong  YU Jiancheng  XU Dongfeng  SUN Chaohui 《海洋湖沼学报（英文）》2019,(5):1469-1480

In this study, high-resolution temperature and salinity data obtained from three Sea-Wing underwater gliders were used together with satellite altimeter data to track the vertical thermohaline structure of an anticyclonic eddy that originated from the loop current of the Kuroshio southwest of Taiwan, China. One of the gliders crossed the entire eddy and it observed a remarkable warm anomaly of as much as 3.9℃ extending to 500 dbar from the base of the mixed layer. Conversely, a positive salinity anomaly was found to be above 200 dbar only in the anticyclonic eddy, with a maximum value of >0.5 in the mixed layer. Below the mixed layer, water of higher salinity (>34.7) was found, which could have been preserved through constrained vertical mixing within the anticyclonic eddy. The salinity in the upper layer of the anticyclonic eddy was much similar to that of the northwestern Pacific Ocean than the northern South China Sea, reflecting Kuroshio intrusion with anticyclonic eddy shedding from the loop current.  相似文献   

热带北大西洋海温异常对南海夏季风的影响及其机理          下载免费PDF全文

徐集云  霍利微  宋超辉  刘樱  陈君芝  庆涛 《大气科学学报》2019,42(2):293-302

利用HadiSST资料、CMAP降水资料和NCEP/NCAR再分析资料,分析了热带北大西洋(Northern Tropical Atlantic,NTA)海表温度异常(Sea Surface Temperature Anomaly,SSTA)与南海夏季风(South China Sea Summer Monsoon,SCSSM)的联系及可能机制。观测分析表明,夏季NTA海温异常与SCSSM存在显著的负相关关系;NTA海温正异常时,北半球副热带东太平洋至大西洋区域存在气旋式环流异常,有利于热带大西洋(热带中太平洋)地区产生异常上升(下沉)运动,使得西北太平洋地区出现反气旋环流异常,该反气旋环流异常西侧的南风异常使得SCSSM增强。利用春季NTA指数、东南印度洋海温异常指数、北太平洋海温异常指数、南太平洋经向模(South Pacific Ocean Meridional Dipole,SPOMD)及Niňo3.4指数构建了SCSSM季节预测模型,预测模型后报与观测的SCSSM指数的相关系数为0.81,表明该模型可较好预测SCSSM。  相似文献   

Twenty years of ocean observations with China Argo     

Zenghong Liu  Xiaogang Xing  Zhaohui Chen  Shaolei Lu  Xiaofen Wu  Hong Li  Chunling Zhang  Lijing Cheng  Zhaoqin Li  Chaohui Sun  Jianping Xu  Dake Chen  Fei Chai 《海洋学报(英文版)》2023,42(2):1-2

The international Argo program, a global observational array of nearly 4 000 autonomous profiling floats initiated in the late 1990s, which measures the water temperature and salinity of the upper 2 000 m of the global ocean, has revolutionized oceanography. It has been recognized one of the most successful ocean observation systems in the world. Today, the proposed decade action “OneArgo” for building an integrated global, full-depth, and multidisciplinary ocean observing array for beyond 2020 ...  相似文献   

Targeted observation analysis of the tides and currents in a Coastal Marine Proving Ground     

Zhang  Jiali  Zhang  Anmin  Zhang  Xuefeng  Zhang  Liang  Li  Dong  Shen  Zheqi  Sun  Chaohui 《Ocean Dynamics》2020,70(10):1303-1313

Ocean Dynamics - Tidal characteristics in the well-known Coastal Marine Proving Ground near Chudao Island located in Shandong Province, China, are firstly investigated based on Princeton Ocean...  相似文献   

安徽青阳高家塝钨钼矿床与狮金山钼铜多金属矿床的成岩成矿系统     

徐晓春  吴迪  傅仲阳  白茹玉  许心悦  宋朝晖 《大地构造与成矿学》2021,45(3):492-508

安徽青阳高家塝钨钼矿床和狮金山钼铜多金属矿床位于江南过渡带北段,均赋存于青阳-九华复式花岗岩体北缘的花岗闪长斑岩侵入体中,两者在空间上紧密相邻,成矿元素组合分别为W-Mo和Cu-Pb-Zn-Au.本文在系统的野外地质调查和岩相学工作基础上,对两个矿床赋矿花岗闪长斑岩主量元素、微量元素、稀土元素和Sr-Nd同位素地球化学...  相似文献   

Sea-floor exhalative sedimentary and magmatic hydrothermal superimposition on the Bainiuchang polymetallic deposit in Yunnan Province： REE geochemical evidence     

ZHU Chaohui ZHANG Qian SHAO Shuxun ZHU Xiaoqing HE Yuliang WANG Dapeng 《中国地球化学学报》2007,26(3):267-275

In order to study the characteristics of sea-floor exhalative sedimentary and magmatic hydrothermal superimposition on the Bainiuchang polymetallic deposit, the REE compositions of the granites, host-rocks and ores have been systematically analyzed by ICP-MS. As viewed from their REE compositions, the granites show obvious negative Eu anomalies and weak negative Ce anomalies. According to their REE characteristics, the host-rocks were derived partly from sea-floor exhalative sediments. In terms of their REE compositions, the ores can be divided into two groups: one group, of which the samples were collected from the Baiyang segment relatively far away from the Bozhushan granite batholith, possesses positive Eu anomalies or no Eu anomaly and negative Ce anomalies, indicating that ore-forming hydrothermal fluid was relatively reductive and its temperature was higher than 250 ℃. Furthermore, the coinstantaneous presence of positive Eu anomalies and negative Ce anomalies indicate that the convective mixing of a little amount of seawater with hydrothermal fluid had happened while ores were precipitated on ancient sea floor. The other group, of which the samples were mainly collected from the Chuanxindong and Duimenshan segments near the Bozhushan granite batholith, has similar chondrite-monalized REE distribution patterns to those of the magmatic rocks. But as a whole, the REE characteristics of both groups change gradually starting from the Bozhushan granite batholith. Based on the REE characteristics of the granites, host-rocks and ores, it is suggested that the ore-forming metals seem to have come from several different sources.  相似文献