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Observation and simulation of the diffuse attenuation coefficient of downwelling irradiance in the Polar Ocean

Science China Earth Sciences 2023年第7期66卷 1535-1546页

作者： Weibo WANG chunsheng jing Xiaogang GUO Ocean Dynamic Laboratory Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Physical and Geological Processes Xiamen 361005China

The three-stream radiation transfer model is used to investigate the fluctuation in the underwater diffuse attenuation coefficient of downwelling irradiance in the polar ocean with a high solar zenith angle and different direct radiation ***,the applicability of the three-stream radiation model in the polar region is validated by using 18 in situ observation data from September to October 2009 in the Beaufort *** show that in the absence of sea ice,the average relative errors between the simulation and observation values for 490 nm downwelling irradiance (E_(d)(490)) and its diffuse attenuation coefficient (K_(d)(490)) are 7.04%and 9.88%,*** the stations surrounded by sea ice,the radiation is relatively small due to ice blocking,and the average relative errors simulated by the model reach 15.89%and 15.55%,***,simulations with different chlorophyll concentrations and different proportions of direct radiation reveal that a high solar zenith angle has a greater impact on K_(d)(490) in the surface water.K_(d)(490) is less affected by the light field (affected by the solar zenith angle and the proportion of direct radiation) at depths greater than 30 m,and meets the linear relationship with the inherent optical parameters(the sum of the absorption coefficient and backscattering coefficient).The surface K_(d)(490) is still consistent with that at a depth of more than 50 meters under a high solar zenith angle,implying that the surface K_(d)(490) can also be considered as an inherent optical parameter at a high solar zenith angle (greater than 60 degrees).The relative error of obtaining surface K_(d)(490) by using the linear relationship at the 50 m layer is found to be less than 8%in the seawater with chlorophyll concentration greater than0.05 mg m^(-3).The effect of the solar zenith angle and proportion of direct radiation can be ignored when measuring the diffuse attenuation coefficient in the polar ***,the

关键词： “three-stream”radiation transfer model Diffuse attenuation coefficient Solar zenith angle Proportion of direct radiation Polar ocean

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Three-dimensional thermohaline anomaly structures of rings in the Kuroshio Extension region

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Acta Oceanologica Sinica 2020年第3期39卷 25-35页

作者： Ya’nan Ding chunsheng jing Third Institute of Oceanography Ministry of Nature ResourcesXiamen 361005China

Using AVISO satellite altimeter observations during 1993–2015 and a manual eddy detection method, a total of 276 anticyclonic rings and 242 cyclonic rings shed from the Kuroshio Extension(KE) were identified, and their three-dimensional(3D) anomaly structures were further reconstructd based on the Argo float data and the Japan Agency for Marine-Earth Science and Technology(JAMSTEC) cruise and buoy data through an interpolation method. It is found that the cyclonic(anticyclonic) rings presented consistent negative(positive) anomalies of potential temperature;meanwhile the relevant maximum anomaly center became increasingly shallow for the cyclonic rings whereas it went deeper for the anticyclonic rings as the potential temperature anomaly decreased from the west to the east. The above deepening or shoaling trend is associated with the zonal change of the depth of the main thermocline. Moreover, the composite cold ring between 140° and 150°E was found to exhibit a double-core vertical structure due to the existence of mode water with low potential vorticity. Specifically, a relatively large negative(positive) salinity anomaly and a small positive(negative) one appeared for the composite cyclonic(anticyclonic) ring at the depth above and below 600 m, respectively. The underlying driving force for the temperature and salinity anomaly of the composite rings was also attempted, which varies depending on the intensity of the background current and the temperature and salinity fields in different areas of the KE region, and the rings’ influences on the temperature and salinity could reach deeper than 1 000 m on average.

关键词： Kuroshio Extension pinched-off ring thermohaline anomaly three-dimensional structure composite eddy

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Coupling and propagating of mesoscale sea level variability between the western Pacific and the South China Sea

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Chinese Science Bulletin 2007年第12期52卷 1699-1707页

作者： LI Li jing chunsheng ZHU DaYong Department of Oceanography Xiamen University Xiamen 361005 China The Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

The coupling and propagating features of mesoscale sea level variability between the western Pacific (WP) and the South China Sea (SCS) were studied based on time series analyses of satellite altimeter measured, along-track sea surface height anomalies (SSHA) along 21°N and the slope of the northern SCS. The analyses show that mesoscale sea level fluctuations in the WP have rather limited coherent effects on the SCS, and no statistically significant propagation of mesoscale variability through the Luzon Strait was observed except in the 45-day band. Evidence suggests that the 45-day fluctuation is very much likely a character of the Kuroshio originating from its low-latitude beginning. It is also sug- gested that the westward propagating Rossby waves will deform when they encounter the dynamical barrier of the Kuroshio. The Kuroshio will then acts on the SCS in its own way. The SCS is a relatively isolated system in the sense of coupling and propagating of oceanic mesoscale waves.

关键词：西太平洋南海海平面可变性中尺度波浪黑潮

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Estimate of contribution of near-inertial waves to the velocity shear in the Bay of Bengal based on mooring observations from2013 to 2014

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Acta Oceanologica Sinica 2021年第11期40卷 1-10页

作者： Shanwu Zhang Yun Qiu Hangyu Chen Junqiang Shen Junpeng Zhang jing Cha Fuwen Qiu chunsheng jing Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

Near-inertial motions contribute most of the velocity shear in the upper *** the Bay of Bengal(BoB),the annual-mean energy flux from the wind to near-inertial motions in the mixed layer in 2013 is dominated by tropical cyclone(TC)***,due to the lack of long-term observations of velocity profiles,our knowledge about interior near-inertial waves(NIWs)as well as their shear features is *** this study,we quantified the contribution of NIWs to shear by integrating the wavenumber-frequency spectra estimated from velocity profiles in the upper layers(40-440 m)of the southern Bo B from April 2013 to May *** is shown that the annual-mean proportion of near-inertial shear out of the total is approximately 50%,and the high contribution is mainly due to the enhancement of the TC processes during which the near-inertial shear accounts for nearly 80%of the *** the steady monsoon seasons,the near-inertial shear is dominant to or at least comparable with the subinertial *** contribution of NIWs to the total shear is lower during the summer monsoon than during the winter monsoon owing to more active mesoscale eddies and higher subinertial shear during the summer *** Doppler shifting of the M_(2)internal tide has little effect on the main results since the proportion of shear from the tidal motions is much lower than that from the near-inertial and subinertial motions.

关键词： near-inertial waves shear monsoon tropical cyclone Bay of Bengal

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Intra-seasonal variability of the abyssal currents in COMRA's contract area in the Clarion-Clipperton Zone

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Acta Oceanologica Sinica 2022年第11期41卷 1-11页

作者： Fangfang Kuang jing Cha Junpeng Zhang Aijun Pan Hangyu Chen Xiwu Zhou chunsheng jing Xiaogang Guo Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China

In this paper,the intra-seasonal variability of the abyssal currents in the China Ocean Mineral Resources Association(COMRA)polymetallic nodule contact area,located in the western part of the Clarion and Clipperton Fraction Zone in the tropical East Pacific,is investigated using direct observations from subsurface mooring instruments as well as sea-surface height data and reanalysis *** observations were conducted from September 13,2017 to August 15,2018 in the COMRA contact area(10°N,154°W).The results were as follows:(1)At depths below 200 m,the kinetic energy of intra-seasonal variability(20-100 d)accounts for more than 40%of the overall low-frequency variability,while the ratio reaches more than 50%below 2000 m.(2)At depths below 200 m,currents show a synchronous oscillation with a characteristic time scale of 30 d,lasting from October to the following January;the energy of the 30-d oscillation increases with depth until the layer of approximately 4616 m,and the maximum velocity is approximately 10 cm/s.(3)The 30-d oscillation of deep currents is correlated with the tropical instability waves in the upper ocean.

关键词： intra-seasonal variability abyssal currents Clarion-Clipperton Zone tropical instability waves

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Responses of the Zhe-Min coastal current adjacent to Pingtan Island to the wintertime monsoon relaxation in 2006 and its mechanism

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Science China Earth Sciences 2013年第9期56卷 386-396页

作者： PAN AiJun WAN XiaoFang GUO XiaoGang jing chunsheng The Third Institute of Oceanography Ocean Dynamics Laboratory

In conjunction with synchronous remotely sensed winds and sea surface temperature （SST）, the spatiotemporal features of the Zhe-Min coastal current （ZMCC）, especially responses of the ZMCC adjacent to Pingtan Island （PT） to the wintertime mon- soon relaxation in 2006 and corresponding mechanism are investigated based on the field observations. In situ data are ac- quired from Conductivity-Temperature-Depth （CTD） cruise and Bottom-Mounted Moorings （BMM）, which are conducted during a comprehensive survey for the Chinese Offshore Investigation and Assessment Project in winter 2006. It is revealed that the ZMCC is well mixed vertically in winter 2006. The ZMCC （〈14℃） recedes during the relaxation of the wintertime monsoon and is accompanied by the enhanced northward shift of the warm, saline Taiwan Strait Mixed Water （TSMW, higher than 14~C and is constituted by the Taiwan Strait Warm Water and the Kuroshio Branch Water）. And greatly enhanced south- ward intrusion of the ZMCC can be detected when the wintertime monsoon restores. Correspondingly, the thermal interface bounded by the ZMCC and the TSMW moves in the northwest/southeast direction, leading to periodic warm/cold reversals of the near-seabed temperature adjacent to the PT. By EOF （Empirical Orthogonal Function） analysis of the large-scale wind fields and wavelet power spectrum analysis of the water level, ocean current and the near-seabed temperature, responses of the ZMCC off the PT to wintertime monsoon relaxation are suggested to be attributed mainly to the southward propagating coast- ally trapped waves triggered by the impeding atmospheric fronts. As a result, ocean current and near-seabed temperature demonstrate significant quasi-5 d and quasi-10 d subtidal oscillations. By contrast, the onshore/offshore water accumulation resulted from Ekman advection driven by the local winds has minor contributions.

关键词： Zhe-Min coastal current Taiwan Strait mixed water coastally trapped wave wintertime monsoon sea surface temper-ature water level near-seabed temperature

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黑潮延伸体区域脱落涡旋的时空特征分析

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海洋学报 2019年第5期41卷 47-58页

作者：丁雅楠靖春生邱云自然资源部第三海洋研究所福建厦门361005

本文利用1993-2015年AVISO卫星高度计融合数据,统计分析了从黑潮延伸体流轴脱落涡旋的空间分布特征、运动属性以及季节、年际和类年代际变化。研究结果表明,23年间共追踪到242个气旋涡,276个反气旋涡,脱落的涡旋主要分布在沙茨基海隆以... 详细信息

本文利用1993-2015年AVISO卫星高度计融合数据,统计分析了从黑潮延伸体流轴脱落涡旋的空间分布特征、运动属性以及季节、年际和类年代际变化。研究结果表明,23年间共追踪到242个气旋涡,276个反气旋涡,脱落的涡旋主要分布在沙茨基海隆以西区域。从脱落涡旋的源地空间分布来看,气旋涡的形成区域有两个高值区,一个位于黑潮延伸体流轴稳定弯曲处,即144°～146°E之间的上游区域;另一个位于沙茨基海隆西侧156°E处。而反气旋涡的形成区域也有两个高值区,一个位于沙茨基海隆以西的下游区域,另一个位于148°E处。这些在上游和下游脱落的涡旋大多向西移动,其中有88%的涡旋再次被流轴吸收。脱落涡旋的数量显示出了明显的年际和类年代际变化。在流轴的上下游区域,类年代际和年际变化分别占主导地位。并且在上游区域,脱落涡旋的类年代际变化与黑潮延伸体的强度呈负相关。在季节变化上,夏季脱落形成的涡旋最多,冬季最少。

关键词：黑潮延伸体脱落涡旋时空特征季节变化年际和类年代际变化

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ASSESSMENT THE APPLICABILITY OF HOLLOW CORE ROCKBOLTS IN DEEP TUNNELS AT JP-HYDROPOWER STATION

ASSESSMENT THE APPLICABILITY OF HOLLOW CORE ROCKBOLTS IN DEE...

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2009 International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"

作者： Weijiang Chu,chunsheng Zhang,jing Hou East China Investigation and Design Institute Under CHECC Hangzhou city

Jinping Second Stage Hydropower Station(JP-II) is located at Yalongjing River in Liangshan Yi Autonomous Region,Sichuan *** sluice gate is situated at Maomaotan in the west of Jinping Mountain and the plant at Dahuigou in the *** four hydropower tunnel,each of approximately 16.7 km in length running parallel to each other and crossing the Jinping Mountain,an alpine karst zone,will connect the sluice gate and the plant *** tour hydropower tunnels are designated 1 to 4,*** 1 and 3 will be made by Drill & Blast method(D&B) and tunnels 2 and 4 will be mainly constructed by TBM and partially by Drill and Blast *** average overburden is 1500～2000 m,the maximum overburden is *** TBM bore diameter has been defined as 12.4m,while the D&B diameter is *** two transportation tunnels lay parallel to hydropower tunnels which construction works started in November 2003 and breakthrough on 8 August *** transportation tunnels will not only serve as traffic and transport access to both JP-Ⅰand JP-Ⅱ2 hydropower projects,but also be the exploratory adit, test adit and construction adit to the hydropower tunnel of JP-Ⅱ.The construction works of hydropower tunnel 2 and 4 start in December 2006,and TBM tunnel,hydropower tunnel 1 and 3,start in October 2008. The tunnels are characterized by long alignment,high overburden,high ground water pressure and complex geological ***,proper and effective methods should be taken for solving the key technical problems such as high rock stresses leading to rock burst and squeezing,possible adverse ground conditions in large fault *** has been emphasized during the design and in the contract that proper excavation methods and treatment are essential factors for safe,economical and high-speed construction of the hydropower tunnels. During the construction of transportation tunnel,conventional grout bolts used as systematic support pattern,and swellex bolts used as temporary

关键词： deep tunnel marble rock mass strength brittle failure hollow core bolts excavation response

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“海翼号”水下滑翔机盐度数据的热滞后效应偏差订正方法探讨

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应用海洋学学报 2022年第1期41卷 156-165页

作者：杨得厚靖春生黄奖自然资源部第三海洋研究所福建厦门361005

水下滑翔机可以高效地观测海水的温度、盐度和压强等海洋参数,但由于热滞后效应,盐度数据,特别是在温度梯度较大的温跃层,会出现一定程度的偏差。本研究选取了3种目前常用的盐度热滞后订正方法,对带泵的“海翼号”水下滑翔机,于2019年8... 详细信息

水下滑翔机可以高效地观测海水的温度、盐度和压强等海洋参数,但由于热滞后效应,盐度数据,特别是在温度梯度较大的温跃层,会出现一定程度的偏差。本研究选取了3种目前常用的盐度热滞后订正方法,对带泵的“海翼号”水下滑翔机,于2019年8月在中北太平洋所观测的盐度数据因热滞后效应引起的偏差进行订正处理,与船载911型温盐深测量仪(Instrument for Measuring Conductivity Temperature and Depth,CTD)观测盐度进行对比,在比较了3种方法对滑翔机盐度订正前后下降和上升剖面偏差的减少程度、订正后剖面与船载CTD观测剖面的偏差大小和下降上升温盐曲线(T-S曲线)的一致程度后,得出了水下滑翔机盐度订正的最优方法,即在订正电导池中实际温度的前提下,采用计算机图形分割方法,最小化滑翔机机载CTD测得的下降和上升两个剖面T-S曲线围成面积所确定的目标函数,来确定合适的热滞后修正振幅和时间常数,从而修正下降和上升两个剖面之间盐度偏差。

关键词：海洋水文学水下滑翔机 CTD 盐度热滞后效应

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利用双平行激光器法获取深海底栖生物大小及其误差分析

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地球科学进展 2022年第8期37卷 863-870页

作者：王维波何雪宝靖春生林辉自然资源部第三海洋研究所海洋动力学研究室福建厦门361005 福建省海洋物理和地质过程重点实验室福建厦门361005 自然资源部第三海洋研究所海洋生物多样性研究室福建厦门361005 自然资源部第三海洋研究所海洋生态环境预警监测研究室福建厦门361005

摄像拖体是深海底栖生物调查中一个有力的新技术,具有调查范围广、持续时间长、原位无破坏等特点。已有研究较少关注自动化识别和误差分析。选取中国大洋协会第50航次太平洋摄像拖体观测图像,构建了深海生物个体形态测量方法,并对摄像... 详细信息

摄像拖体是深海底栖生物调查中一个有力的新技术,具有调查范围广、持续时间长、原位无破坏等特点。已有研究较少关注自动化识别和误差分析。选取中国大洋协会第50航次太平洋摄像拖体观测图像,构建了深海生物个体形态测量方法,并对摄像拖体进行误差分析。该系统成功获取了太平洋深处12幅海参形态大小信息,观察到长达70.8 cm的绿色巨型海参。通过分析系统误差、安装误差以及观测误差发现激光器彼此不平行对观测结果影响最大。摄像托体摆动是观测中常见的误差来源,其订正方法依据理论分析获得。自动化识别和系统地分析摄像托体误差来源有利于合理得制定深海生物调查技术标准,推动深海底栖生物大范围普查。

关键词：深海底栖生物双平行激光器测量误差分析

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