南海东北部内潮的模态结构和传播     

刘倩  谢晓辉  尚晓东  陈桂英  汪宏 《海洋学报(英文版)》2019,38(9):12-23

The evolution of energy, energy flux and modal structure of the internal tides(ITs) in the northeastern South China Sea is examined using the measurements at two moorings along a cross-slope section from the deep continental slope to the shallow continental shelf. The energy of both diurnal and semidiurnal ITs clearly shows a～14-day spring-neap cycle, but their phases lag that of barotropic tides, indicating that ITs are not generated on the continental slope. Observations of internal tidal energy flux suggest that they may be generated at the Luzon Strait and propagate west-northwest to the continental slope in the northwestern SCS. Because the continental slope is critical-supercritical with respect to diurnal ITs, about 4.6 kJ/m~2 of the incident energy and 8.7 kW/m of energy flux of diurnal ITs are reduced from the continental slope to the continental shelf. In contrast, the semidiurnal internal tides enter the shelf because of the sub-critical topography with respect to semidiurnal ITs.From the continental slope to the shelf, the vertical structure of diurnal ITs shows significant variation, with dominant Mode 1 on the deep slope and dominant higher modes on the shelf. On the contrary, the vertical structure of the semidiurnal ITs is stable, with dominant Mode 1.  相似文献   

利用多源高度计资料提取南海低模态内潮能量     

马静怡  徐永生 《海洋与湖沼》2018,49(6):1169-1177

吕宋海峡由于剧烈变化的地形成为内潮产生的源地,内潮是海洋混合的重要原因。为了认知南海的内潮能通量分布,对南海的内潮有更好的理解,本文利用21世纪以来发射的多颗高度计卫星:J2、J1T、GFO以及EN,提取了吕宋海峡附近内潮的能通量。研究使用了调和分析和高通滤波等方法来提取第一模态内潮,主要提取K_1,K_2,M_2,N_2,O_1,P_1,Q_1和S_2八个分潮。同时结合WOA数据对能通量进行计算。结果表明,目标区域潮汐以全日分潮为主,所选区域的全日分潮中K_1所占比例最大;半日分潮中M_2分潮最强,而内潮的能通量则是M_2分潮所占最大,在吕宋海峡区域M_2能通量为6.45GW。内潮主要产生在地形变化剧烈的地方,海域的大部分地区内潮能量很小。在吕宋海峡中部,全日分潮能通量要小于南部地区,而半日分潮则有较大值。  相似文献   

利用半参数模型估计确定验潮组网的深度基准面     

蒋廷臣  杨雯彦  汪峰  安俊杰  张亚一  孙丙辰 《海洋测绘》2019,39(2):1-4

深度基准面的确定是进行海洋测量的基础,准确确定深度基准面是进行海洋测量的有效前提。提出了一种将CORS技术与验潮组网技术进行结合的新传递深度基准面的方法,实现长、短期验潮站同步验潮实现深度基准面的增强传递;提出了采用半参数模型理论来求取潮差比的计算方法;具体阐述了验潮组网通过间接平差求取短期验潮站的深度基准面的计算方法,减少了验潮测量的人力投入,计算潮差比时考虑了系统误差的影响,计算短期验潮站时考虑了观测误差对深度基准面传递的影响。  相似文献   

南极布兰斯菲尔德海峡正压潮数值模拟     

周相乾  胡松  张瑜 《极地研究》2019,31(1)

本文利用高分辨率的有限体积海洋模型(FVCOM)模拟了南极布兰斯菲尔德海峡附近海区的M_2、S_2、K_1与O_1四个主要分潮,模拟结果与验潮站资料基本符合。将模拟结果计算并利用潮汐调和常数绘制了同潮图,该海峡附近海域的潮汐类型为混合半日潮,全日潮在西南部及南极半岛附近海域较东北部南设得兰群岛附近海域比重偏大。通过分别计算4个分潮的潮能通量,发现M_2分潮潮能来自海峡东部的太平洋与威德尔海, S_2、K_1与O_1分潮潮能来自大西洋与威德尔海。在布兰斯菲尔德海峡区域4个分潮共耗散90.6 MW,其中O_1分潮耗散最大,约占到总潮能耗散的49.09%;由威德尔海潮能在进入布兰斯菲尔德海峡之前,在南极海峡区域4个分潮共耗散278.87 MW,其中S_2分潮耗散最大约占到总潮能耗散的39.09%。  相似文献   

基于验潮站组网的深度基准面确定          下载免费PDF全文

刘聚  暴景阳  许军 《海洋测绘》2015,(6):24-28

分析了短期和临时验潮站深度基准确定的不统一性。重点研究了以长期验潮站作为控制,将验潮站组网传递确定深度基准面的方法,具体阐述了最小二乘拟合求取潮差比与平差方法求取深度基准值的计算方法与原理。利用仿真实验与实例计算论证了该方法的合理与可靠性。得出的结论是:在海道测量作业海域,基于验潮站组网确定深度基准可以达到理想的精度,且获得含义统一的深度基准面。  相似文献   

验潮站零点漂移检测及修订方法的改进          下载免费PDF全文

黄辰虎  刘敏  陈英凯  李明辉  陆秀平  翟国君 《海洋测绘》2015,(2):4-8

考虑到利用中数法计算的日平均海面可能残留较多的短周期分潮影响,会给验潮站零点的漂移检测及修订引入一项潜在的系统差,进而影响到潮汐分析及水深测量水位改正等应用。提出了基于Godin法计算日平均海面的验潮站零点漂移检测及修正的改进方法。应用结果表明Godin法较中数法可明显削弱短周期分潮影响,从而可提高验潮站零点漂移检测及修订的精度。  相似文献   

应用实时定量PCR技术检测秦皇岛近岸海域褐潮原因种——抑食金球藻(Aureococcus anophagefferens)     

GUO Hao  LIU Yongjian  ZHANG Qi  YUAN Xiutang  ZHANG Weiwei  ZHANG Zhifeng 《海洋学报(英文版)》2015,34(2):132-136

Aureococcus anophagefferens, a small pelagophyte algae, has caused brown tide blooms in coastal waters of Qinhuangdao in recent years, presenting significant negative impacts on the shellfish mariculture industry. Under standard light microscopy, it is visually indistinguishable from other small algae in field samples due to its extremely small size. In this study, quantitative polymerase chain reaction(q PCR) based on 18 S r DNA sequences was developed and used to detect and enumerate A. anophagefferens. A linear regression(R2 = 0.91) was generated based on cycle thresholds value(Ct) versus known concentrations of A. anophagefferens. Twenty-two field samples collected in coastal waters of Qinhuangdao were subjected to DNA extraction and then analyzed using q PCR. Results showed that A. anophagefferens had a wide distribution in coastal waters along Qinhuangdao. Elevated A. anophagefferens abundance, category 3 brown tide blooms(200 000 cells/m L) occurred at Dongshan Beach and Tiger-stone Beach in August in 2013. In shellfish mariculture areas along coastal waters of Qinhuangdao, 4 stations had category 3 blooms, and 6 stations had category 2 blooms(35 000–200 000 cells/m L) in August and all stations had category 1 blooms(0 to ≤35 000 cells/m L) in October. Quantitative PCR allows for detection of A. anophagefferens cells at low levels in filed samples, which is essential to effective management and prediction of brown tide blooms.  相似文献   

2008年中国沿岸冬季寒潮激发陆架波的小波分析   总被引：1，自引：0，他引：1  

李君益  郑全安  胡建宇  范振华  朱佳  陈涛  朱本璐  徐莹 《海洋学报(英文版)》2015,34(11):22-31

This study applies the wavelet analysis to the tidal gauge records, alongshore winds, atmospheric temperature and pressure along the China coast in winter 2008. The analysis results show three events of sea level oscillations(SLOs) on the shelf induced by winter storms. The first event occurred from January 9 to 21. The SLO periods were double-peaked at 1.6–5.3 and 7.0–16.0 d with the power densities of 0.04–0.05 and 0.10–0.15 m2·d, respectively.The second event occurred from February 5 to 18. The SLO period was single-peaked at 2.3–3.5 d with power density of 0.03–0.04 m2·d. The third event occurred from February 20 to March 8. The SLO periods were doublepeaked at 1.5–4.3 and 6.1–8.2 d with the power densities of 0.08–0.11 and 0.02–0.08 m2·d, respectively. The SLOs propagated along the coast from Zhejiang in north to Guangdong in south. The phase speeds ranged about 9–29m/s from Kanmen to Pingtan, 5–11 m/s from Xiamen to Huizhou and 11–22 m/s from Huizhou to Shuidong. The dispersion relation of the SLOs shows their nature of coastal-trapped wave.  相似文献   

吕宋海峡M₂内潮的三维数值模拟     

李秉天  曹安州  吕咸青 《海洋学报(英文版)》2015,34(11):55-62

A three-dimensional isopycnic-coordinate internal tidal model is employed to investigate the generation,propagation, vertical structure and energy conversion of M2 internal tides in the Luzon Strait(LS) with mooring observations. Simulated results, especially the tidal current amplitudes, agree well with observations,demonstrating the reasonability and accuracy of the model. Results indicate that M2 internal tides mainly propagate into three directions horizontally, i.e., eastward towards the western Pacific Ocean, westward towards the Dongsha Island and southwestward towards the South China Sea Basin. In the horizontal direction, tidal current amplitudes decrease as distance increases away from the LS; in the vertical direction, they show an obvious decreasing tendency with depth. Between the double ridges of the LS, a clockwise gyre of M2 baroclinic energy flux appears, which is caused by reflections of M2 internal tides at supercritical topographies, and resonance of M2 internal tides happens along 19.5° and 21.5°N due to the heights and separation distance of the double ridges. The total energy conversion in the LS is about 14.20 GW.  相似文献   

河口往复流中潮流不对称与推移质输沙的关系   总被引：2，自引：0，他引：2  

李谊纯  董德信  陈波 《海洋科学》2015,39(6):99-103

潮流不对称现象是近岸潮波运动的基本特征之一,为了研究潮流不对称对推移质泥沙长期净输运的作用机制,首先在往复流情况下对Bagnold推移质输沙率公式(1966)由于不包含起动流速所可能导致的误差进行理论分析,进而由统计学中的"偏度"的概念出发,推导了河口潮流不对称与推移质输沙之间的定量关系。研究认为,虽然Bagnold推移质输沙率公式不包含泥沙起动流速,但是只要泥沙起动流速和最大流速的比值在一定范围内,则在理论上公式的计算误差是可以接受的。由偏度结合Bagnold公式导出了潮流不对称与推移质输沙之间的关系,表明推移质泥沙的长期净输运不仅与余流有关,而且与不同分潮组合之间、余流与分潮之间的相互作用紧密相关。该关系还给出了一个由潮流调和常数估算河口推移质输沙的简便方法。经对比,从潮流不对称出发估算推移质输沙与直接采用推移质输沙率公式结果一致。  相似文献