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Coastal sea level variability in the Bohai Bay: influence of atmospheric forcing and prediction

Journal of Oceanology and limnology 2019年第2期37卷 486-497页

作者： lü xianqing WANG Daosheng YAN Bing YANG Hua Key laboratory of Engineering Sediment of the Ministry of Transport / National Engineering laboratory for Port Hydraulic Construction Technology Tianjin Research Institute for Water Transport Engineering M.O.T. Tianjin 300456 China Physical Oceanography laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao 266100 China College of Marine Science and Technology China University of Geosciences Wuhan 430074 China Shenzhen Research Institute China University of Geosciences Shenzhen 518057 China

The sea level variabilities, especially the atmosphere-driven sea level variabilities, which are diff erent in studies on diverse areas and timescales, need to be further documented in the Bohai Bay. Coastal sea level data and coincident meteorological data collected hourly at two observation stations (E1 and E2) in the Bohai Bay, which is a typical semi-enclosed coastal sea in China, are analyzed for the period from 19 August 2014 to 18 November 2014. The sub-sampled low-pass (levels (SlSls) at E1 and E2 are almost the same as each other, while the winds are not. On the whole, SlSls at E1 and E2 are dominantly influenced by the across-shore wind;in detail, the dominant wind orientation at E1 is 65° measured clockwise from north, and SlSl at E2 is significantly influenced by the sub-sampled wind (SW) at 55°. Regression of SlSl onto the corresponding SW in dominant orientation and the atmospheric pressure is used to predict SlSl, which make the frequency of occurrences when the predicted total sea level is within 0.15 m from the observed values increase to 66.03% and 58.08% at E1 and E2 from original 36.71% and 34.80% without using it, respectively. The results indicate that for the prediction of the total sea level variability in the coastal shallow waters, the SlSl influenced by the atmospheric forcing, including local wind and atmospheric pressure, can be predicted using the multivariable linear regression model.

关键词： coastal sea level atmospheric forcing Bohai Bay prediction

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Adjoint Assimilation in Marine Ecosystem Models and an Example of Application

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Journal of Ocean University of China 2005年第1期4卷 14-20页

作者： XUQing lIUYuguang lüxianqing PhysicalOceanographylaboratory OceanUniversityofChinaQingdao266003P.R.China

This paper aims at a review of the work carried out to date on the adjoint assimilation of data in marine ecosys-tem models since 1995. The structure and feature of the adjoint assimilation in marine ecosystem models are also introduced. To illustrate the application of the adjoint technique and its merits, a 4-variable ecosystem model coupled with a 3-D physical model is established for the Bohai Sea and the Yellow Sea. The chlorophyll concentration data derived from the SeaWiFS o-cean colour data are assimilated in the model with the technique. Some results are briefly presented.

关键词： model marine ecosystem adjoint assimilation cost function

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南海主要分潮振幅变化趋势再探

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海洋学报 2022年第5期44卷 62-70页

作者：于茜潘海东吕咸青中国海洋大学物理海洋学教育部重点实验室山东青岛266100 自然资源部第一海洋研究所山东青岛266061 自然资源部海洋环境科学与数值模拟重点实验室山东青岛266061 山东省海洋环境科学与数值模拟重点实验室山东青岛266061 青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室山东青岛266237

潮汐变化研究对于沿海地区海洋工程、洪涝灾害预防和海洋资源开发利用等各方面都有着非常重要的意义。之前的潮汐变化研究主要基于多年逐时验潮站观测,而验潮站数据无论是站点的个数还是站点的位置,都存在很大的局限性,这对我们研究海... 详细信息

潮汐变化研究对于沿海地区海洋工程、洪涝灾害预防和海洋资源开发利用等各方面都有着非常重要的意义。之前的潮汐变化研究主要基于多年逐时验潮站观测,而验潮站数据无论是站点的个数还是站点的位置,都存在很大的局限性,这对我们研究海盆尺度的潮汐变化规律形成了一定程度的阻碍。前人基于25年的T/P-Jason卫星高度计数据发现南海中央深海海盆主要分潮振幅存在异常大的趋势,这是由于中尺度海洋运动对潮汐调和分析干扰导致的虚假结果。本文首次使用了XTRACK软件处理过的长达27年的T/P-Jason卫星高度计观测来研究整个南海的主要分潮振幅的长期趋势。经过X-TRACK处理后的卫星观测数据在整个南海的准确性和完整性都有了显著的提升。同时,我们使用了权重最小二乘法来消除长周期采样导致的潮汐混淆的影响。我们发现在南海大部分海域,4大主要分潮的振幅都存在显著的变化趋势。振幅和迟角变化的极值主要分布在吕宋海峡西部、马六甲海峡和台湾海峡等水深和岸线变化剧烈的近海海域,振幅最大的上升趋势可达2.75 mm/a,振幅最大的下降趋势可达-2.16 mm/a。南海主要分潮振幅的长期趋势与河流径流以及人类活动密切相关。

关键词：南海潮汐长期趋势 X-TRACK 卫星高度计 S_TIDE

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南海潮汐主要分潮振幅变化趋势研究

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海洋学报 2021年第6期43卷 26-34页

作者：潘海东王雨哲吕咸青中国海洋大学物理海洋学教育部重点实验室山东青岛266100

潮汐变化研究对于海洋工程、沿海地区洪涝灾害预防、海上交通等各个方面都有着重要的意义。由于验潮站都集中在近海,所以之前潮汐变化研究主要集中在近海海域。相比之下,深海地区由于长期高频水位观测的缺乏导致相关的潮汐变化研究非常... 详细信息

潮汐变化研究对于海洋工程、沿海地区洪涝灾害预防、海上交通等各个方面都有着重要的意义。由于验潮站都集中在近海,所以之前潮汐变化研究主要集中在近海海域。相比之下,深海地区由于长期高频水位观测的缺乏导致相关的潮汐变化研究非常少。基于近海验潮站数据和深海卫星高度计数据,本文首次用非平稳潮汐调和分析工具包S_TIDE提取了南海4大主要分潮(M_(2)、S_(2)、K_(1)、O_(1))振幅的长期趋势。研究发现在南海大部分地区,4大主要分潮的振幅都是比较稳定的,不存在显著的上升趋势或下降趋势。在南海少部分地区4大主要分潮的振幅存在显著的趋势,最大的上升趋势可达2.91 mm/a,最大的下降趋势可达3.50 mm/a。该海域潮汐的长期趋势可能与内潮海表面信号的变化有关。卫星观测到的潮汐既包含正压潮,也包含内潮海表面信号。南海作为全球内潮活动最活跃的海域之一,其内潮海表面信号是非常显著的。而内潮对海洋层化的变化是非常敏感的,海洋层化的变化会影响内潮的生成、传播和耗散以及内潮在海表的显示,最终引起该海域潮汐振幅的长期趋势。

关键词：南海潮汐长期趋势卫星高度计 S_TIDE 内潮

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伴随同化技术在渤、黄海生态模式中的应用：控制变量的选取与孪生实验

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高技术通讯 2006年第1期16卷 78-83页

作者：徐青刘玉光程永存吕咸青中国海洋大学物理海洋实验室青岛266003 解放军理工大学气象学院南京211101

在渤、黄海海域建立了物理海洋模型与NPZD生态模型的耦合模型，就伴随同化技术应用中如何从众多模型参数中选择控制变量的难题做了深入研究。研究发现，对于渤、黄海海区的NPZD模型，除了用传统的方法选取控制变量之外，代价函数关于模... 详细信息

在渤、黄海海域建立了物理海洋模型与NPZD生态模型的耦合模型，就伴随同化技术应用中如何从众多模型参数中选择控制变量的难题做了深入研究。研究发现，对于渤、黄海海区的NPZD模型，除了用传统的方法选取控制变量之外，代价函数关于模型参数的梯度信息也可以作为选取控制变量的标准之一，这从另一个角度解决了如何确定控制变量的问题。另外，通过孪生实验验证了在渤、黄海NPZD生态模式中使用伴随同化技术同化水色遥感数据的可行性，这为以后将水色卫星遥感数据同化到海洋生态模型中奠定了基础。

关键词：伴随同化控制变量敏感性分析生态模型孪生实验

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海洋生态模型中的伴随同化方法

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海洋通报 2005年第6期24卷 58-64页

作者：徐青刘玉光程永存吕咸青中国海洋大学物理海洋重点实验室解放军理工大学气象学院江苏南京211101

伴随同化方法(简称“伴随法”)在1995年被首次应用于海洋生态模型,此后,它在海洋生态模型的研究中得到了广泛的应用。在本文中,作者详细阐述了海洋生态模型中伴随法的结构和特点,具体介绍了伴随法在海洋生态模型应用中的研究进展;并且... 详细信息

伴随同化方法(简称“伴随法”)在1995年被首次应用于海洋生态模型,此后,它在海洋生态模型的研究中得到了广泛的应用。在本文中,作者详细阐述了海洋生态模型中伴随法的结构和特点,具体介绍了伴随法在海洋生态模型应用中的研究进展;并且以渤、黄海NPZD生态数值模式为例,展示了伴随法的优越性。

关键词：海洋生态模型伴随法同化

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Sea Surface Temperature Simulation of Tropical and North Pacific Basins Using a Hybrid Coordinate Ocean Model (HYCOM)

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Marine Science Bulletin 2008年第1期10卷 1-14页

作者：高松吕咸青王海棠国家海洋局北海预报中心山东青岛266033 中国海洋大学物理海洋实验室山东青岛266003 青岛环海海洋工程勘察研究院山东青岛266033

A Hybrid Coordinate Ocean Model （HYCOM） is used to simulate the sea surface temperature of the Tropical and North Pacific. Based on the different combinations of two air-Sea flux data sets （COADS and ECMWF） and two bulk parameter formulas （non-constant and constant）, four numerical experiments are carried out. The following conclusions can be deduced from the numerical results. （1） The numerical results using non-constant bulk parameter formula are much better than those using constant one. In the Pacific area from 40°N to 20°S, the annual average SST obtained from the experiment using non-constant bulk parameter formula is 0.21 ℃ higher than that from the satellite-based SST climatology （the pathfinder data）. However, the difference is 0.63 ℃ for the experiment when the using constant one. （2） HYCOM successfully simulates the monthly variation of climatological SST in tropical and north Pacific basins and monthly spatial variation of Western Pacific Warm Pool. Especially in the Pacific area from 40°N to 20°S, the difference of the seasonal averaged SST between pathfinder data and the result of experiment 2 （using COADS data set and non-constant bulk parameter formula） is only about 0.02 ℃. （3）The simulation results using different Air-Sea flux data are different and the difference is very large in some regions. In the northwest of the model region, the annual average SST obtained from experiment 2 （using COADS data set） is 1℃ higher than that obtained from experiment 4 （using ECMWF data set）. Contrarily, the result of experiment 4 is 1 ℃ larger than that of experiment 2 in the southeast of the model region. The largest difference is about 4 ℃ occurred near the area of 58°N, 140°E and the Bohai sea.

关键词： ocean model: air-sea flux sea surface temperature (SST)

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Alcoholism Detection by Wavelet Energy Entropy and linear Regression Classifier

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Computer Modeling in Engineering & Sciences 2021年第4期127卷 325-343页

作者： xianqing Chen Yan Yan School of Electronic Science and Engineering Nanjing UniversityNanjing210093China Department of Electrical Engineering College of EngineeringZhejiang Normal UniversityJinhua321004China Educational Information Center Liming Vocational UniversityQuanzhou362000China

Alcoholism is an unhealthy lifestyle associated with alcohol *** only does drinking for a long time leads to poor mental health and loss of self-control,but alcohol seeps into the bloodstream and shortens the lifespan of the body’s internal *** often think of alcohol as an everyday drink and see it as a way to reduce stress in their lives because they cannot see the damage in their bodies and they believe it does not affect their physical *** their drinking increases,they become dependent on alcohol and it affects their daily ***,it is important to recognize the dangers of alcohol abuse and to stop drinking as soon as *** assist physicians in the diagnosis of patients with alcoholism,we provide a novel alcohol detection system by extracting image features of wavelet energy entropy from magnetic resonance imaging(MRI)combined with a linear regression *** with the latest method,the 10-fold cross-validation experiment showed excellent results,including sensitivity 91.54±1.47%,specificity 93.66±1.34%,Precision 93.45±1.27%,accuracy 92.61±0.81%,F1 score 92.48±0.83%and MCC 85.26±1.62%.

关键词： Alcohol detection wavelet energy entropy linear regression classifier cross-validation computer-aided diagnosis

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Plane wave fitting of the internal tidal sea-surface height signatures extracted from the TOPEX/Poseidon altimeter data along satellite tracks

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Acta Oceanologica Sinica 2012年第4期31卷 31-45页

作者： CHEN Haibo lV xianqing WANG Bin laboratory of Physical Oceanography Ocean University of ChinaQingdao 266100China

The sea-surface height （SSH） signatures of internal tides extracted from the TOPEX/Poseidon （T/P） altimeter data along satellite tracks are fitted with superposition of several plane waves which have different wavenumber vectors. The key problem of plane wave fitting with iterative method is how to determine the initial value of wavenumber of each plane wave. The previous solving method is to analyze the internal tidal SSH signatures along each track with wavenumber spectrum. But it is found that the problem cannot be solved completely with the wavenumber spectrum analysis method only. The method based on the combination of wavenumber spectrum analysis method and the exhaustive method is proposed to determine the initial values of wavenumbers for iteration. Numerical results indicate that the proposed method is not only reasonable and feasible but also better than the previous method. The proposed method is an improvement of the previous one, which is beneficial to improving the precision of plane wave fitting of the T/P internal tidal SSH signatures and deepening the understanding of the internal tides in ocean.

关键词： plane wave fitting internal tides TOPEX/Poseidon altimeter data

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Provenance of Conglomerate and Sandstone from Early Permian Shoushangou Formation in Xi Ujimqin,Inner Mongolia:Implications for Understanding Paleo-Asian Ocean Subduction

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 10-31页

作者： ZHANG Yingli GUO xianqing MA Shouxian MNR Key laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China Chinese Academy of Geological Sciences Beijing 100037China

During the late Carboniferous to Early Permian,a rift was formed by post-collisional extension after ocean closure or an island arc-related basin formed by Paleo-Asian Ocean(PAO)subduction in the Xi Ujimqin ***,the closure time of the PAO is still under ***,to identify the origin of the PAO,the geochemistry and U-Pb age of zircons were analyzed for the extra-large deep marine,polymict clastic boulders and sandstones in the Shoushangou Formation within the *** analyses revealed magmatic activity and tectonic *** conglomerates include megaclasts of granite(298.8±9.1 Ma)and granodiorite porphyry(297.1±3.1 Ma),which were deposited by muddy debris *** of this study demonstrated that the boulders of granitoids have the geochemistry of typical I-type granite,characterized by low Zr+Nb+Ce+Y and low Ga/Al *** granitoid boulders were formed in island arc setting,indicating the presence of arc magmatism in the area that is composed of the late Carboniferous to Early Permian subduction-related granitoid in southern Xi *** diagrams for determining sedimentary provenance using major and trace elements indicate that Shoushangou sediments originated from continental island arc-related felsic *** zircon U-Pb age cluster of 330–280 Ma was obtained,indicating input from granite,ophiolite,Xilin Gol complex,and Carboniferous sources to the *** basin was geographically developed behind the arc during the Early Permian period because the outcropped intrusive rocks in the late Carboniferous to Early Permian form a volcanic *** comprehensive analyses of source areas suggest that Shoushangou sediments developed in a backarc basin in response to the northward subduction of the *** backarc basin and intrusive rocks,in addition to previously published late Carboniferous to Early Permian magmatic rocks of arc unit in Xilin Gol,confirm the presence of an Early Permian trencharc-basin system in the region,r

关键词： provenance analysis backarc basin Shoushangou Formation Early Permian Central Asian Orogenic Belt

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