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Spatio-temporal variability of surface chlorophyll a in the Yellow Sea and the East China Sea based on reconstructions of satellite data of 2001-2020

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Journal of Oceanology and Limnology 2024年第2期42卷 390-407页

作者： Weichen XIE Tao WANG wensheng jiang Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China

Chlorophyll-a(Chl-a)concentration is a primary indicator for marine environmental *** spatio-temporal variations of sea surface Chl-a concentration in the Yellow Sea(YS)and the East China Sea(ECS)in 2001-2020 were investigated by reconstructing the MODIS Level 3 products with the data interpolation empirical orthogonal function(DINEOF)*** reconstructed results by interpolating the combined MODIS daily+8-day datasets were found better than those merely by interpolating daily or 8-day ***-a concentration in the YS and the ECS reached its maximum in spring,with blooms occurring,decreased in summer and autumn,and increased in late autumn and early *** performing empirical orthogonal function(EOF)decomposition of the reconstructed data fields and correlation analysis with several potential environmental factors,we found that the sea surface temperature(SST)plays a significant role in the seasonal variation of Chl a,especially during spring and *** increase of SST in spring and the upper-layer nutrients mixed up during the last winter might favor the occurrence of spring *** high sea surface temperature(SST)throughout the summer would strengthen the vertical stratification and prevent nutrients supply from deep water,resulting in low surface Chl-a *** sea surface Chl-a concentration in the YS was found decreased significantly from 2012 to 2020,which was possibly related to the Pacific Decadal Oscillation(PDO).

关键词： chlorophyll a(Chl a) data interpolation empirical orthogonal function(DINEOF) empirical orthogonal function(EOF)analysis Yellow Sea East China Sea

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基于ArcGIS Engine的风暴潮淹没适应气候变化策略辅助决策系统开发

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中国海洋大学学报（自然科学版） 2024年第2期54卷 142-153页

作者：廖琪江文胜中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室山东青岛266100

本研究构建了基于ArcGIS Engine的风暴潮淹没适应气候变化策略辅助决策系统,将风暴潮淹没适应气候变化策略研究过程流程化和简单化,并提供7个面向用户开放的决策端口,辅助决策者做出科学的风暴潮淹没适应气候变化策略选择。以青岛市风... 详细信息

本研究构建了基于ArcGIS Engine的风暴潮淹没适应气候变化策略辅助决策系统,将风暴潮淹没适应气候变化策略研究过程流程化和简单化,并提供7个面向用户开放的决策端口,辅助决策者做出科学的风暴潮淹没适应气候变化策略选择。以青岛市风暴潮淹没为例的系统应用,进一步验证了该系统能够切实提高研究过程的分析效率,为中国沿海地区的适应风暴潮灾害提供技术支持。

关键词：适应气候变化辅助决策系统 ArcGIS Engine 风暴潮淹没

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海洋悬浮物浓度的长期演变特征及机制

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中国海洋大学学报（自然科学版） 2024年第10期54卷 83-89页

作者：江文胜赵盖博边昌伟中国海洋大学海洋环境与生态教育部重点实验室山东青岛266100 中国海洋大学环境科学与工程学院山东青岛266100 中国海洋大学物理海洋教育部重点实验室山东青岛266100

受气候变化和人类活动的影响,21世纪以来全球海洋的悬浮物浓度发生了显著变化。悬浮物浓度的剧烈变化不可避免地对海洋生态环境、地貌演化和生物地球化学循环产生重大影响。随着气候变化对人类活动的环境影响研究的深入,以及卫星遥感数... 详细信息

受气候变化和人类活动的影响,21世纪以来全球海洋的悬浮物浓度发生了显著变化。悬浮物浓度的剧烈变化不可避免地对海洋生态环境、地貌演化和生物地球化学循环产生重大影响。随着气候变化对人类活动的环境影响研究的深入,以及卫星遥感数据的不断积累,悬浮物浓度的长期变化趋势及其机制已成为地球科学研究的热点。本文概括性地总结了海洋悬浮物浓度长期变化的国内外研究进展,指出了中国近海相关研究的不足之处,并对未来发展方向作出了展望。

关键词：海洋悬浮物浓度长期变化趋势主控机制

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胶州湾国家海洋公园沿岸地区土地利用预测研究

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中国海洋大学学报（自然科学版） 2024年第3期54卷 133-143页

作者：耿爱玉王宁于格江文胜王尚中国海洋大学环境科学与工程学院山东青岛266100 中国海洋大学海洋环境与生态教育部重点实验室山东青岛266100 山东省环境保护科学研究设计院有限公司山东济南250013

元胞自动机-马尔科夫耦合模型(CA-Markov模型)作为土地利用变化(LUCC)的一种研究手段,具有马尔科夫模型精确地模拟LUCC未来变化情况,同时还具有元胞自动机模型模拟复杂系统空间变化的能力。本研究运用CA-Markov模型,以分区预测为原则,... 详细信息

元胞自动机-马尔科夫耦合模型(CA-Markov模型)作为土地利用变化(LUCC)的一种研究手段,具有马尔科夫模型精确地模拟LUCC未来变化情况,同时还具有元胞自动机模型模拟复杂系统空间变化的能力。本研究运用CA-Markov模型,以分区预测为原则,对胶州湾国家海洋公园沿岸地区过去十年的土地利用构成及变化进行分析,同时对研究区未来三十年的土地利用变化进行中期预测和长期预测。结果表明:胶州湾国家海洋公园沿岸地区建设用地面积在过去十年增大,而在未来三十年将不断减小;模型的预测精度将随预测时长的增加而下降,需要根据其他因素对模拟结果进行一定程度的修正;未来土地利用方式的转变将为国家级海洋公园的生态保护和海洋生态文明建设起到积极推动作用。

关键词：土地利用预测分析 CA-Markov模型胶州湾国家海洋公园分区预测

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Analysis of a simplification strategy in a nonhydrostatic model for surface and internal wave problems

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Acta Oceanologica Sinica 2023年第2期42卷 29-43页

作者： Jinghua Zhang wensheng jiang Xueqing Zhang Key Laboratory of Marine Environment and Ecology of Ministry of Education Ocean University of ChinaQingdao266100China Tianjin Research Institute for Water Transport Engineering Ministry of TransportTianjin300456China Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology Ocean University of ChinaQingdao266100China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao266237China

This paper examines the simplification strategy of retaining only the nonhydrostatic effect of local acceleration in a three-dimensional fully nonhydrostatic model regarding the submesoscale wave phenomenon in the *** scale analysis of the vertical component of the Reynold-averaged Navier-Stokes(RANS)equation was performed,confirming the rationalization of this ***,the simplification was implemented in a RANS equation-based nonhydrostatic model NHWAVE(nonhydrostatic WAVE)to make a simplified nonhydrostatic *** examples were taken to test its performance,including surface sinusoidal waves propagating on an idealized East China Sea topography,tidally induced internal lee waves and small-scale solitary *** results show that in a considerably wide range of nonlinear strengths,the simplified nonhydrostatic model can obtain similar results as those in the fully nonhydrostatic model,even for smaller-scale solitary *** influences the applicability of the *** stronger the nonlinearity is,the worse the simplified model describes the nonhydrostatic *** general,the simplified nonhydrostatic model can simulate surface waves better than internal *** of computational efficiency in the simplified nonhydrostatic model is reasonable,reducing the central processing unit time duration in the fully nonhydrostatic model by 16.4%–20.6%.The specially designed algorithm based on the simplified nonhydrostatic equation can remarkably reduce the computational time.

关键词： simplification of nonhydrostatic model submesoscale wave internal lee wave

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Adjoint Method-Based Algorithm for Calculating the Relative Dispersion Ratio in a Hydrodynamic System

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Journal of Ocean University of China 2021年第4期20卷 790-802页

作者： JI Fei jiang wensheng GUO Xinyu State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Marine Environment and Ecology(Ministry of Education of China)Ocean University of China Qingdao 266100China Center for Marine Environmental Studies Ehime UniversityMatsuyama 790-8577Japan

Relative dispersion ratio(RDR)can be used to quantify the deviation behavior of a water parcel’s trajectory caused by a disturbance in a hydrodynamic *** can be calculated by using a standard method for determining relative dispersion(RD),which accounts for the growth of the deviation of a cluster of particles from a specific initial ***,the standard method for computing RD is time *** involves numerous computations on tracing many water *** this study,a new method based on the adjoint method is proposed to acquire a series of RDR fields in one round of *** this method,the continuous variation in the RDR corresponding to a time series of the disturbance time t can be *** consistency and efficiency of the new method are compared with those of the standard method by applying it to a double-gyre flow and an unsteady Arnold-Beltrami-Childress flow *** show that the two methods have good consistency in a finite time *** new method has a notable speedup for evaluating the RDR at multiple t.

关键词： relative dispersion particle tracking adjoint method computational efficiency

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Improved Numerical Computing Method for the 3D Tidally Induced Lagrangian Residual Current and Its Application in a Model Bay with a Longitudinal Topography

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Journal of Ocean University of China 2019年第6期18卷 1235-1246页

作者： CUI Yanxing jiang wensheng ZHANG Jinghua Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and TechnologyQingdao 266100China Department of mathematics Changzhi UniversityChangzhi 046000China

An improved method for computing the three-dimensional(3 D)first-order Lagrangian residual velocity(uL)is *** method computes tidal body force using the harmonic constants of the zeroth-order tidal *** with using the tidal-averaging method to compute the tidal body force,the proposed method filters out the clutter other than the single-frequency tidal input from the open boundary and obtains uL that is more consistent with the analytic *** on the new method,uL is calculated for a wide bay with a longitudinal *** strength and pattern of uL are mostly determined by the parts of the tidal body force related to the vertical mixing of the Stokes’drift and the Coriolis effect,with a minor contribution from the advection *** geometrical shape of the bay can influence uL through the topographic *** magnitude of uL increases with the increases in tidal energy input and vertical eddy viscosity and decreases in terms of the bottom friction coefficient.

关键词： Lagrangian residual current tidal body force numerical method dynamics

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Analytical Solution for 3D Tidal Flow with Vertically Varying Eddy Viscosity

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Journal of Ocean University of China 2019年第4期18卷 771-783页

作者： CHEN Yang jiang wensheng FENG Shizuo Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao 266100 China Laboratory of Marine Environment and Ecology Ocean University of China Qingdao 266100 China

In this study, a 3D idealized model of tidal flow, in which the tidal elevation and velocities are solved analytically, is developed. The horizontal eddy viscosity is neglected, and the vertical eddy viscosity used in the study is assumed to be independent of time and only varies as a parabolic function in the vertical direction. The analytical solution is obtained in a narrow rectangular bay, with the topography varying only across the bay. The model results are compared with the field observations in the Xiangshan Bay. The results show that the influence of varying vertical eddy viscosity mainly has two aspects. On one hand, it amplifies the magni- tude of the tidal elevation, particularly the amplitude near the head of the bay. On the other hand, it adjusts the axial velocity profile, resulting in an obvious frictional effect. Furthermore, the tidal elevation and velocities are more sensitive to the magnitude of the eddy viscosity near the bottom than the structure in the upper water layer.

关键词： vertically varying eddy viscosity tidal flow analytical solution three dimensional

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A Lagrangian mean theory on coastal sea circulation with inter-tidal transports ***

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Acta Oceanologica Sinica 2008年第6期27卷 1-16页

作者： FENG Shizuo JULian jiang wensheng Key Laboratory of Physical Oceanography of Ministry of Education Institute of Physical Oceanography Ocean University ofChina Qingdao 266100 China

A brief review is made on the theory of the Lagrangian residual circulation and inter-tidal transports in a convectively weakly nonlinear system. In the review the emphasis is put on the systematical development of the theory and its weakness of convectively weakly nonlinear approximation. The fundamentals of a Lagrangian tidally-averaged theory on circulation with inter-tidal transport processes have been proposed for a general nonlinear coastal/estuarine system. The Lagrangian residual velocity is strictly de- fined, and it has been verified to be able to embody the velocity field of circulation. A new concept of the concentration for inter- tidal transport processes is presented. The concentration describing the inter-tidal transport processes should be a ＂Lagrangian inter-tidal concentration＂ defined and named, but not the Eulcrian tidally-averaged concentration used traditionally. The circulation described here contains a set of infinite temporal-spatial fields of velocity/concentration, each of which corresponds to a specific value of tidal phases varying continuously over one tidal cycle. When the convectively weakly nonlinear condition（ with a smaller order of eddy diffusion and sources） is approximately satisfied, a set of infinite temporal-spatial fields of velocity/concentration can be reduced to a single one.. the mass transport velocity/the Eulerian tidally averaged concentration as exhibited traditionally.

关键词： nonlinear shallow waters tide-dominating system coastal water circulation Lagrangian residual velocity Lagrangian inter-tidal concentration

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基于神经网络的风暴潮增水对海岸带城市排水的影响分析--以青岛市为例

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中国海洋大学学报（自然科学版） 2024年第8期54卷 113-122页

作者：王尚于格江文胜耿爱玉贾渃淇张文袖中国海洋大学环境科学与工程学院山东青岛266100 中国海洋大学海洋环境与生态教育部重点实验室山东青岛266100

本文以青岛市为研究区域,以0509台风风暴潮增水水位数据为基础,基于BP(Back propagation)神经网络,考虑地形地势特性中易涝因子,并结合水文分析提取入海排水口的空间分布,对青岛市沿海岸排水受风暴潮影响的区域进行预测,并进一步结合青... 详细信息

本文以青岛市为研究区域,以0509台风风暴潮增水水位数据为基础,基于BP(Back propagation)神经网络,考虑地形地势特性中易涝因子,并结合水文分析提取入海排水口的空间分布,对青岛市沿海岸排水受风暴潮影响的区域进行预测,并进一步结合青岛市沿海岸,系统探讨气候变化背景下风暴潮增水对青岛市沿海岸排水的影响。结果表明:除风暴潮增水直接侵袭至陆地内侧区域,青岛大江口湾岸段、浮山湾岸段、汇泉湾岸段、青岛湾岸段、胶州湾东南侧岸段海泊河沿岸等区域在各类情景下排水受风暴潮增水影响较大。

关键词：风暴潮增水排水神经网络气候变化

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