CINRAD/CC型雷达无回波信号故障检修方法

针对近年来CINRAD/CC雷达无回波故障现象,对出现在天馈系统、发射系统、接收系统、信号处理系统中的故障原因进行整理和分析,发现各系统故障存在一些不同的特征。结合CINRAD/CC雷达回波信号的接收流程以及各分系统的工作原理,采用分类法和逐级判断法,检查雷达状态参数,给出各系统出现无回波故障的检修方法,并提供一些测试数据、关键点测试波形作为维修参考,实际工作中业务人员可通过这些指标进行故障判断和维修。以普洱站一次无回波故障的检修实例,描述如何根据终端参数和各分系统的监测点参数变化情况,对故障原因进行判断,按照信号流程采用分段法对关键点进行分析和测试,找出故障点并排除,同时对整个故障的排除过程进行总结,供技术人员探讨。     

Biodiversity and community structural characteristics of macrobenthos in the Chukchi Sea

Field sampling of the macrobenthos from 23 stations in the Chukchi Sea was conducted during the 4th CHINARE(Chinese National Arctic Research Expeditions, July–August, 2010). We identified a total of 140 species of macrozoobenthos belonging to nine phyla, which were dominated by polychaetes(66), crustaceans(30), and mollusks(25), followed by echinoderms(9) and others(ten others, including four cnidarians, one oligochaete, one sipuncula, one priapulida, two bryozoans, and one urochordata). The dominant species were Aphelochaeta pacifica, Heteromastus filiformis, Nephtys ciliata, Nephtys caeca, Scoletoma fragilis, Golfingia margaritacea, Nuculana pernula, Macoma calcarea, Ennucula tenuis, Macoma inquinata, Musculus discors, Echinarachnius parma, and Ophiura sarsii, so there were more cold-eurythermal boreal immigrants than truly Arctic species(endemics). The average density and biomass(mean ± SD across all stations) of the total macrozoobenthos were(916 ± 907) ind/m2 and(902.9 ± 1 227.7) g/m2(wet weight), respectively. Relatively high density and biomass were observed in the samples from the northeastern and southern Chukchi Sea. The spatial variation of benthic communities in the study sea area was relatively large; this spatial heterogeneity has led to high diversity and a patchy distribution pattern in the community structure. Compared to the 1st CHINARE( July–August, 1999), this investigation revealed different degrees of decreases in the average taxa numbers and the average density, abundance, and biodiversity in the area over the recent decade, which might be associated with global warming, human activities, and sea ice variations.     

EST-SSR标记的开发及其在南黄海浒苔研究中的应用

Ulva species can grow rapidly in nutrient-rich habitats causing green tides and marine fouling. A more complete understanding of the reasons behind these outbreaks is urgently required. Accordingly, this study attempts to use microsatellite markers based expressed sequence tag（EST） to analyze the genetic variation of several Ulva prolifera populations in the South Yellow Sea of China. Two hundred and thirty-eight SSRs were identified from 8 179 unique ESTs（6 203 newly sequenced and 1 976 downloaded from NCBI database） and 37 primer pairs were successfully designed according to the ESTs; 11 pairs were selected to detect the genetic diversity and relationship of 69 attached U. prolifera samples and 13 free-floating samples collected from coastal and off-coast areas of the South Yellow Sea. The results of cross-species transferability showed that six of the 11 EST-SSR primers could give good amplification in other five Ulva species and the average allele number was 4.67. Genetic variation analysis indicated that all 82 U. prolifera samples were clearly divided and most samples collected from the same site clustered together as a group in the dendrogram tree produced by unweighted pair-group mean analysis（UPGMA） method and the cluster results showed some consistency with the geographical origins. In addition, 13 free-floating samples（except HT-001-2） were grouped as a single clade separated from the attached samples.     

自动站一次故障的应急处理及排除

<正>随着气象现代化进程的不断推进,自动气象站将逐步取代人工观测,成为获得地面气象观测资料的主要途径。自动气象站在室外连续工作,其性能容易受到雨雪、雷电、高低温等自然环境的影响。以泾河国家基本站CAWS600型自动站的一次故障为例,通过对故障维修过程进行分析,提供自动气象站故障排查思路,为此类故障     

两要素区域自动气象站故障排查与维修方法

利用陕西省气象信息综合监控平台,根据区域自动气象站监控的状态和可疑数据查询记录发现故障,总结提出故障排查和维修的实用方法。     

Modes of Mesoscale Convective System Organization During Meiyu Season over the Yangtze River Basin

Mesoscale convective systems （MCSs） are classified and investigated through a statistical analysis of composite radar reflectivity data and station observations during June and July 2010-2012. The number of linear-mode MCSs is slightly larger than the number of nonlinear-mode MCSs. Eight types of linear-mode MCSs are identified： trailing stratiform MCSs （TS）, leading stratiform MCSs （LS）, training line/adjoining stratiform MCSs （TL/AS）, back-building/quasi-stationary MCSs （BB）, parallel stratiform MCSs （PS）, bro- ken line MCSs （BL）, embedded line MCSs （EL）, and long line MCSs （LL）. Six of these types have been identified in previous studies, but EL and LL MCSs are described for the first time by this study. TS, LS, PS, and BL MCSs are all moving systems, while TL/AS, BB, EL, and LL MCSs are quasi-stationary. The average duration of linear-mode MCSs is more than 7 h. TL/AS and TS MCSs typically have the longest durations. Linear-mode MCSs often develop close to the Yangtze River, especially over low-lying areas and river valleys. The diurnal cycle of MCS initiation over the Yangtze River valley contains multiple peaks. The vertical distribution of environmental wind is decomposed into storm-relative perpendicular and parallel wind components. The environmental wind field is a key factor in determining the organizational mode of a linear-mode MCS.     

卫星广播系统CMACast市级接收站常见故障处理

<正>1引言中国气象局卫星数据广播系统CMACast采用DVB-S2卫星数据广播标准和1个完整的C波段通信卫星转发器,建设新一代气象数据卫星广播系统(CMACast),在满足PCVSAT、FENGYUNCast、DVBS三组卫星数据广播系统现有用户业务需求的基础上,实现中国气象局三组数据广播资源的整合,大幅提高卫星数据广播的信息速率、时效性和可靠性。满足广大用户对日益增长的气象信息种类和数量的需求,使新增加的风云三号气象卫星数据产品、雷达数     

GFE（L）1型二次测风雷达典型故障分析与维修

怀化GFE（L）1型二次测风雷达从2007年1月使用至今,出现过各种各样的故障.为提高雷达维护维修能力,充分发挥雷达性能,延长雷达使用寿命,该文归纳总结了7a来雷达维护维修经验,分析了该站6种常见典型故障,给出排除方法,供同行参考.     

毕节CINRAD/CD天气雷达一次天线俯仰失控的分析与处理

该文根据毕节CINRAD/CD天气雷达一次天线俯仰失控,导致体扫功能丧失的故障现象,结合伺服系统的信号流程,对此次故障的诊断、处理过程作了详细介绍,并就伺服系统角码显示的故障处理总结一些经验,为同型号雷达机务保障人员提供一些借鉴和参考.     

利用卫星测高技术确定浙江海域大地水准面

利用多颗卫星的测高数据,经共线平均及交叉点平差,建立浙江深海海域2.5′×2.5′格网分辨率的平均海面高模型,在扣除海面地形影响后得到海域的大地水准面起伏,并与EGM2008所得计算结果进行对比;利用移去-恢复技术及SVR方法,联合验潮站GPS/水准数据与EGM2008大地水准面模型,计算浙江近岸海域大地水准面起伏;最终建立浙江海域2.5′×2.5′格网分辨率的大地水准面模型。