系缆式剖面测量平台的试验及分析   总被引：3，自引：2，他引：1  

李墨  李永军 《海洋技术学报》2008,27(2):1-4

文章围绕测量平台的基本运动能力,介绍了一些平台固有特性的试验和理论分析,明确了这些特性对平台驱动力和阻力的作用,供有关人员参考交流。  相似文献   

两型国产CTD海上比测试验结果分析          下载免费PDF全文

雷发美  商少平  贺志刚  戴昊 《应用海洋学学报》2020,39(1):136-143

基于目前国内海洋仪器的现状,为了对国产温盐深剖面仪(Conductivity-Temperature-Depth profiler,CTD)的性能和实际使用情况有个量化的结果,在我国南海东北部海域对国内较为成熟且具备产品化条件的两型国产CTD开展第三方独立检验与验证。比测过程中,采用同架捆绑,同步下放的方法进行测量。数据处理时,采用一种简便的移相相关法,对国产CTD的压力(P)、温度(T)、电导率(C)、盐度(S)与标准CTD进行对比分析。试验结果表明两者数据曲线趋势一致,线形基本吻合,参试的国产CTD基本上达到自身产品标称精度,但低于标准CTD精度。本次比测结果有利于促进技术成果的完善与固化,有利于进一步提高设备的可靠性、稳定性和批量一致性,为国产海洋环境监测设备的规模化应用和推广提供数据支撑。  相似文献   

珠峰地区大气边界层结构的一次观测研究   总被引：5，自引：15，他引：5  

孙方林  马耀明  马伟强  李茂善 《高原气象》2006,25(6):1014-1019

利用2005年8月31日~9月5日中国科学院珠穆朗玛峰综合观测研究站的LAP3000风廓线仪的观测资料,分析了该地区气温日变化和大气边界层风廓线结构。结果表明,该地区1500 m以下大气边界层主要受高原山地地形及珠峰地区冰川环境的影响,冰川风可能是引起观测期间下午强风天气的主要原因;1500 m以上高空受西风气流影响程度增大,但东南风仍占有一定比例。  相似文献   

THE ANALYSIS OF THE RELATIONSHIP BETWEEN PULSE OF LLJ AND HEAVY RAIN USING WIND PROFILER DATA   总被引：1，自引：1，他引：1  

刘淑媛  郑永光  陶祖钰 《热带气象学报(英文版)》2003,9(2):158-163

1 INTRODUCTION With the principle of Doppler effect, the wind-profiler acquires high-resolution vertical wind profiles every few minutes and every few dozens of meters[1, 2]. In contrast, data obtained with conventional soundings do not reflect the true conditions right over the sounding site, for the balloons are going with the wind in upper levels. The National Oceanic and Atmospheric Administration, U.S.A., made a final assessment of the wind-profiler networks deployed in central …  相似文献   

Acoustic Doppler current profiler surveys along the Yangtze River     

Zhongyuan Chen  Dechao Chen  Kaiqin Xu  Yiwen Zhao  Taoyuan Wei  Jing Chen  Luqian Li  Masataka Watanabe 《Geomorphology》2007,85(3-4):155

An acoustic Doppler current profiler is used to characterize the river velocity against the morphology of the Yangtze River from Chonqing to the sea. High flow velocities occur in the Three Gorges section and lower velocities in the middle and lower reaches of the river. This is largely due to the change in river pattern from a high gradient deeply-cut valley to a flat fluvial plain. Flow velocities fluctuate in the middle Yangtze due to the presence of meander bends of different length. There are numerous smaller velocity fluctuations in the lower Yangtze channel that reflect multichannel pattern with numerous sand bars and a river morphology affected by bedrock outcrops. Water depths of 40–100 m occur in the Three Gorges valley but decrease to 15–40 m in the middle and lower Yangtze. At the Gezhou Reservoir, 30 km downstream of the Three Gorges damsite velocity drops to low (< 1.0 m s^− 1) 20 km reach. A second low velocity (< 0.5 m s^− 1) zone, about 20 km in length, is located in the lower Yangtze near the coast probably due to the tidal influence. The results from this research will serve as a datum for evaluating changes to the river once the Three Gorges dam is completed in 2009.  相似文献   

云的垂直速度特征分析及人工影响天气作业措施探讨     

袁野  王成章  张苏 《气象科学》2007,27(5):502-509

利用2002年5—7月肥西风廓线仪资料结合常规地面观测资料,对出现各种云时的垂直速度特征进行了分析,在此基础上提出了人工影响天气作业的一些具体措施,希望对云的研究和人工影响天气作业提供帮助。  相似文献   

珠峰地区雨季对流层大气的特征分析   总被引：3，自引：1，他引：3  

陈学龙  马耀明  孙方林  李茂善  王树舟 《高原气象》2007,26(6):1280-1286

利用2007年7月中国科学院珠穆朗玛峰综合观测站的边界层塔、无线电探空和风温廓线仪观测资料,分析了珠穆朗玛峰地区雨季低层大气风温湿等特征.珠峰地区雨季近地层风速、风向、温度等有明显的日变化.近地层风的日变化有两个很明显的阶段,00:00～14:30受谷风的影响而刮偏北风,14:30～24:00受冰川风的影响以偏南风为主.白天的冰川风比夜间的谷风要强些.中午13:30在600m以下存在强水平风速垂直切变,这可能是珠峰地区发生降雨的重要原因之一.低空急流在夏季比较常见.对流层平均降温率为0.685K/100m.低层大气的相对湿度一般有两个峰值高度,最大值在4000m以下,第二峰值高度不固定,到16000m以后相对湿度超不过10%.各层大气的风速风向差别较大.  相似文献   

深圳LAP-3000型风廓线雷达系统及应用   总被引：1，自引：0，他引：1  

陈元昭王小勇  王明洁胡娟 李辉 《广西气象》2007,28(3):73-76

介绍风廓线雷达的历史、LAP-3000型风廓线雷达的基本原理以及深圳市LAP-3000型风廓线雷达的数据存贮格式、风廓线雷达产品的显示等内容;并给出了几种典型风场在风廓线上的反映及对一次冷空气过程的分析。  相似文献   

国内外CTD校准实验室及校准技术研究的现状和展望     

于厚隆  贾肇基 《海洋技术学报》2000,19(1):32-41

本文在叙述ＣＴＤ剖面仪和传感器校准方法的基础上,介绍了当前国内外ＣＴＤ校准技术研究和校准设备的现状。提出了我国应加强ＣＴＤ传感器动态校准的研究,同时,应研制精度慢温盐水盐力罐,用于在实验室内研究建立ＣＴＤ传感器数学模型的方法。  相似文献   

Analysis of the Microphysical Properties of a Stratiform Rain Event Using an L-Band Profiler Radar   总被引：2，自引：0，他引：2       下载免费PDF全文

RUAN Zheng  MING Hu  MA Jianli  GE Runsheng  BIAN Lingen 《Acta Meteorologica Sinica》2014,28(2):268-280

This paper investigates spatial and temporal distributions of the microphysical properties of precipitating stratiform clouds based on Doppler spectra of rain particles observed by an L-band profiler radar.The retrieval of raindrop size distributions（RSDs） is accomplished through eliminating vertical air motion and isolating the terminal fall velocity of raindrops in the observed Doppler velocity spectrum.The microphysical properties of raindrops in a broad stratiform region with weak convective cells are studied using data collected from a 1320-MHz wind profiler radar in Huayin,Shaanxi Province on 14 May 2009.RSDs and gamma function parameters are retrieved at altitudes between 700 and 3000 m above the surface,below a melting layer.It is found that the altitude of the maximum number of raindrops was closely related to the surface rain rate.The maximum number of large drops was observed at lower altitudes earlier in the precipitation event but at higher altitudes in later periods,suggesting decreases in the numbers of large and medium size raindrops.These decreases may have been caused by the breakup of larger drops and evaporation of smaller drops as they fell.The number of medium size drops decreased with increasing altitude.The relationship between reflectivity and liquid water content during this precipitation event was Z = 1.69×10~4M~（1.5）,and the relationship between reflectivity and rain intensity was Z = 256I~（1.4）.  相似文献