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Modeling Seasonal Variations of Subsurface Chlorophyll Maximum in South China Sea

Journal of Ocean University of China 2014年第4期13卷 561-571页

作者： GONG Xiang SHI Jie GAO Huiwang key laboratory of marine environment and ecology Ocean University of China

In the South China Sea(SCS), the subsurface chlorophyll maximum(SCM) is frequently observed while the mechanisms of SCM occurrence have not been well understood. In this study, a 1-D physical-biochemical coupled model was used to study the seasonal variations of vertical profiles of chlorophyll-a(Chl-a) in the SCS. Three parameters(i.e., SCM layer(SCML) depth, thickness, and intensity) were defined to characterize the vertical distribution of Chl-a in SCML and were obtained by fitting the vertical profile of Chl-a in the subsurface layer using a Gaussian function. The seasonal variations of SCMs are reproduced reasonably well compared to the observations. The annual averages of SCML depth, thickness, and intensity are 75 ± 10 m, 31 ± 6.7 m, and 0.37 ± 0.11 mg m-3, respectively. A thick, close to surface SCML together with a higher intensity occurs during the northeastern monsoon. Both the SCML thickness and intensity are sensitive to the changes of surface wind speed in winter and summer, but the surface wind speed exerts a minor influence on the SCML depth; for example, double strengthening of the southwestern monsoon in summer can lead to the thickening of SCML by 46%, the intensity decreasing by 30%, and the shoaling by 6%. This is because part of nutrients are pumped from the upper nutricline to the surface mixed layer by strong vertical mixing. Increasing initial nutrient concentrations by two times will increase the intensity of SCML by over 80% in winter and spring. The sensitivity analysis indicates that light attenuation is critical to the three parameters of SCM. Decreasing background light attenuation by 20% extends the euphotic zone, makes SCML deeper(~20%) and thicker(12% – 41%), and increases the intensity by over 16%. Overall, the depth of SCML is mainly controlled by light attenuation, and the SCML thickness and intensity are closely associated with wind and initial nitrate concentration in the SCS.

关键词： South China Sea subsurface chlorophyll maximum seasonal variation numerical modeling

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Amplicon-Based Illumina Sequencing and Quantitative PCR Reveals Nanoplankton Diversity and Biomass in Surface Water of Qinhuangdao Coastal Area, China

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Journal of Ocean University of China 2019年第4期18卷 962-976页

作者： QIAO Ling YU Jie LI Ying GUO Haobing ZHEN Yu ZHANG Lingling MI Tiezhu BAO Zhenmin XU Xiaochun key laboratory of marine environment and ecology Ministry of Education Qingdao 266100 China laboratory for marine ecology and environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China key laboratory of marine Genetics and Breeding (Ocean University of China) Ministry of Education Qingdao 266003 China laboratory for marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China School of Applied Technology Qingdao University Qingdao 266100 China

Aureococcus anophagefferens caused brown tides for three consecutive years from 2009 to 2011 in the coastal waters of Qinhuangdao, China, with numerous, widespread ecological and economic impact on ecosystems. To understand the population dy- namics of nanoplankton during the brown tides, sequences of the V9 region of the 18S rDNA gene, used as a marker, were analyzed by Illumina sequencing to assess nanoplankton biomass, and real-time fluorescence quantitative PCR was performed to analyze spa- tial variation in the 18S rDNA copy concentrations of nanoplankton off the Qinhuangdao coast in July, 2011. The results showed that A. anophagefferens and Minutocellus polymorphus were the dominant species in the local phytoplankton community during the brown tide in July 2011. The highest 18S rDNA copy concentrations of A. anophagefferens and M. polymorphus were detected at stations SHG and FN, respectively. The central area most strongly affected by the brown tide migrated southward from 2011 to 2013. Redundancy analysis (RDA) showed that the decreasing NOx concentration might provide suitable nutrient conditions for the A. anophagefferens outbreak. During the brown tide caused by A. anophagefferens, other phytoplankton, such as diatoms, cryptophytes, chlorophytes, dinoflagellates and other flagellates, could co-occur with it. For zooplankton, due to less selective feeding behavior, Amoebozoa was the most abundant zooplankton at station SHG, while Ciliophora was the most abundant zooplankton at other sta- tions for its more selective feeding.

关键词： Aureococcus anophagefferens Minutocellus polymorphus 18S rDNA gene Illumina sequencing brown tide

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Trait-based approach revealed the seasonal variation of mesozooplankton functional groups in the South Yellow Sea

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marine Life Science & Technology 2023年第1期5卷 126-140页

作者： Zhishuang Zhang Hongju Chen Yixuan Li Ruping Ge Guangxing Liu Shaukat Ali Yunyun Zhuang key laboratory of marine environment and ecology Ministry of EducationOcean University of ChinaQingdao266100China marine ecology and environmental Science laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao266200China Department of environmental Sciences Karakoram International UniversityGilgit15100Pakistan

Functional traits determine the fitness of organisms and mirror their ecological *** trait-based approaches provide ecological insights,it is underexploited for marine zooplankton,particularly with respect to seasonal ***,based on four major functional traits,including body length,feeding type,trophic group,and reproduction mode,we quantified the seasonal variations of mesozooplankton functional groups in the South Yellow Sea(SYS)in the spring,summer,and autumn of *** seasonal dynamics were identified for all traits but patterns varied among *** zooplankton(47.7–88.6%),omnivores–herbivores(81.3–97.6%),and free spawners(54.8–92.5%)dominated in three seasons,while ambush feeders and current feeders dominated in spring(45.7%),and autumn(73.4%),*** analysis of the functional traits showed that the mesozooplankton in the SYS can be classified into eight functional *** biogeographic and seasonal variations of functional groups can be partially explained by environmental *** 1,represented by omnivores–herbivores,was the most dominant functional group,the abundance of which peaked in spring and was positively correlated with chlorophyll a concentration,indicating its close association with phytoplankton *** contribution of giant,active ambush carnivores,passive ambush carnivore jellyfish,current omnivores–detritivores,and parthenogenetic cladocerans increased with sea surface *** proportion of giant,active ambush carnivores and active ambush omnivore–carnivore copepods decreased with salinity in *** study presents a new perspective for understanding the dynamics of zooplankton and paves the way for further research on the functional diversity of zooplankton in the SYS.

关键词： Zooplankton Southern Yellow Sea Functional trait Functional group Seasonal variation

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Effective adsorption of sulfamethoxazole, bisphenol A and methyl orange on nanoporous carbon derived from metal-organic frameworks

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Journal of environmental Sciences 2018年第1期30卷 250-259页

作者： Xiaona Li Hui Yuan Xie Quan Shuo Chen Shijie You key laboratory of Industrial ecology and environmental Engineering (ministry of education) School of Environmental Science and TechnologyDalian University of Technology State key laboratory of Urban Water Resource and environment School of Environment Harbin Institute of Technology

Nanoporous carbons（NPCs） derived from metal–organic frameworks（MOFs） are attracting increasing attention in many areas by virtue of their high specific surface area, large pore volume and unique porosity. The present work reports the preparation of an NPC with high surface area（1731 m^2/g） and pore volume（1.68 cm^3/g） by direct carbonization of MOF-5. We examined the adsorption of three typical contaminants from aqueous solutions, i.e., sulfamethoxazole（SMX）,bisphenol A（BPA） and methyl orange（MO）, by using the as-prepared NPC. The results demonstrated that NPC could adsorb the contaminants effectively, with adsorption capacity（qm） of 625 mg/g（SMX）, 757 mg/g（BPA） and 872 mg/g（MO）, respectively. These values were approximately 1.0-3.2 times higher than those obtained for single-walled carbon nanotubes（SWCNTs） and commercial powder active carbon（PAC） under the same conditions. With its high surface area and unique meso/macropore structure, the enhanced adsorption of NPC most likely originates from the cooperative interaction of a pore-filling mechanism, electrostatic interaction,and hydrogen bonding. In particular, the p H value has a crucial impact on adsorption, suggesting the significant contribution of electrostatic interaction between NPC and the contaminants. This study provides a proof-of-concept demonstration of MOF-derived nanoporous carbons as effective adsorbents of contaminants for water treatment.

关键词： Nanoporous carbon MOFs Adsorption Sulfamethoxazole Bisphenol A Methyl orange

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Plant-and microbe-assisted biochar amendment technology for petroleum hydrocarbon remediation in saline-sodic soils: A review

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Pedosphere 2022年第1期32卷 211-221页

作者： Kudakwashe MEKI Qiang LIU Shuai WU Yanfei YUAN Institute of Coastal environmental Pollution Control Key Laboratory of Marine Environment and EcologyMinistry of EducationInstitute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China

Soil degradation through salinization and pollution by toxic compounds such as petroleum hydrocarbons(PHCs) in the coastal wetlands has become a significant threat to ecosystem health, biodiversity, and food security. However, traditional remediation technologies can generate secondary pollutants, incur high operating costs, and consume significant quantities of energy. Bioremediation, using plants, biochar, and microbes, is an innovative and cost-effective option to remediate contaminated soils. Biochar, as a plant/microbe growth enhancer, is a promising green approach for the sustainable phytoremediation of PHCs in salinized soils. This review therefore summarizes the effect of plant-and microbe-assisted biochar amendment technology for the remediation of PHCs and salinization. Plant-microbe interactions mediated rhizodegradation despite increasing hydrocarbon sorption. Overall, microbial respiration is more active in biochar amendments, due to faster biodegradation of PHCs and improved soil properties. The use of biochar, plants, and microbes is recommended,as it offers a practical and sustainable option, both ecologically and economically, for the remediation of PHCs and excess salinity. Further development of new green technologies is to be encouraged.

关键词： bioremediation microbial community petrochemical pollution phytoremediation salinity

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Preservation of Lipid Molecular Fossils in the Sediments from an Oil-Gas Releasing Zone in the South China Sea

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Journal of Ocean University of China 2018年第6期17卷 1336-1342页

作者： QIU Hong ZOU Li ZHANG Minsheng ZHU Chaoqi JIA Yonggang College of environmental Science and Engineering Ocean University of China education key laboratory for marine environment and ecology Ocean University of China

In order to explore the standing stock and preservation of organic carbon, different forms of compound specific lipids were analyzed, based on a 1.8 m sediment core collected in the northern continental shelf of South China Sea in May, 2016. In the core sediments, 21 species of fatty acids, 6 species of alcohols, 8 species of sterols and phytol were detected. Fatty acids were dominated components with the percent of 67%–91% in the total lipids, in which saturated fatty acid C16:0 accounted for about 50%. The contents of lipid species generally decreased from the sediments at surface to those deep, except alcohols waving in a certain range at the same time. Fatty acids primarily existed in free form, followed by base hydrolytic form, and then acid hydrolytic form. Free alcohols were obviously dominated, while base and acid hydrolytic forms contributed small comparably. Phytol gave a significant priority to base hydrolytic form, while acid hydrolytic form could be neglected. Similar to phytol, sterols mostly presented in base hydrolytic form, and then in free form. The compositions of lipids and their forms suggested that organic carbon basically originated from primary production in upper waters in studying area, and were well preserved in the sediments.

关键词： lipids sediments preservation South China Sea

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Two Kinds of Waves Causing the Resuspension of Deep-Sea Sediments:Excitation and Internal Solitary Waves

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Journal of Ocean University of China 2023年第2期22卷 429-440页

作者： REN Yupeng TIAN Hao CHEN Zhiyuan XU Guohui LIU Lejun LI Yibing key laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China Shandong Provincial key laboratory of marine environment and Geological Engineering Ocean University of ChinaQingdao 266100China key laboratory of marine environment and ecology Ministry of EducationOcean University of ChinaQingdao 266100China First Institute of Oceanography MNRQingdao 266061China

The resuspension of marine sediments plays a key role in the biogeochemical cycle and marine ecology *** solitary waves are considered to be important driving forces of the resuspension of bottom *** this paper,the movement of turbidity currents,the generation and the effects on the bottom bed of internal solitary waves and excitation waves are studied by flume tests and numerical simulations,and the sediment resuspension are *** results show that the excitation wave can lead to the resuspension of the bottom sediments under all the conditions,while the internal solitary wave can lead to the resuspension of the sediment only under some special conditions,such as high amplitude or large underwater *** the experimental conditions,the change in the near-bottom velocity caused by the excitation wave is close to three times that of the internal solitary wave.

关键词： deep-sea sediment resuspension internal solitary wave turbidity current excitation wave

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Assessing Mismatches Between Ecosystem Structure and Function in Jiaozhou Bay by Coordination Degree Algorithm

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Journal of Ocean University of China 2017年第2期16卷 249-261页

作者： CHEN Xiaoyan GAO Huiwang CHEN Zhenhua YAO Xiaohong SUN Peng Guangxi laboratory on the Study of Coral Reefs in the South China Sea Guangxi University of China key laboratory of marine environment and ecology Ministry of Education of China First Institute of Oceanography State Oceanic Administration

A healthy ecosystem depends on the coordination of ecosystem structure and *** coordination among ecosystem components,however,is seldom taken into account in current ecosystem health assessments(EHA).Neglect of such coordination may lead to large degrees of uncertainty in EHA and fail to support ecosystem *** propose an approach to quantify the level of dynamic mismatching between ecosystem structure and function and the impact on ecosystem health by incorporating the ecosystem coordination index into *** coordination degree is calculated using variation coefficient of six proxies for ecosystem structure and *** ecosystem at Jiaozhou Bay,as a microcosm of China's coast,has been documented to fluctuate from healthy to unhealthy status over the past three *** results indicate that there is a 3%-17% lower health level than that calculated by common methods used in the literature,indicating that the health of Jiaozhou Bay has become worse than *** change contributes 20%-52% to ecosystem mismatches and is the most uncoordinated ***-related declines account for approximately one-fourth of the total ecological *** scenarios that aim to resolve ecosystem mismatches could increase efficiency by about 50% compared to restoration scenarios that do not consider *** study investigates ecological declines in a coastal bay due to 30 years of rapid economic *** doing so,this study provides novel insights and enhances our understanding of the reasons for failure in ecological restoration.

关键词： ecosystem coordination index ecosystem health assessment ecosystem restoration Jiaozhou Bay

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Development of a real-time PCR assay(SYBR Green I) for rapid identification and quantification of scyphomedusae Aurelia sp.1 planulae

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Chinese Journal of Oceanology and Limnology 2015年第4期33卷 974-987页

作者：王建艳甄毓米铁柱于志刚王国善 College of marine Life Sciences Ocean University of China College of environmental Science and Engineering Ocean University of China key laboratory of marine environment and ecology Ministry of Education Ocean University of China College of Chemistry and Chemical Engineering Ocean University of China key laboratory of marine Chemistry Theory and Technology Ministry of Education Ocean University of China

The complicated life cycle ofAurelia spp., comprising benthic asexually-reproducing polyps and sexually-reproducing medusae, makes it hard for researchers to identify and track them, especially for early stage individuals, such as planulae. To solve this problem, we developed a real-time PCR assay （SYBR Green I） to identify planulae in both cultured and natural seawater samples. Species-specific primers targeting Aurelia sp.1 mitochondrial 16S rDNA （mr 16S rDNA） regions were designed. Using a calibration curve constructed with plasmids containing the Aurelia sp. 1 mt 16S rDNA fragment and a standard curve for planulae, the absolute number of mt 16S rDNA copies per planula was determined and from that the total number ofplanulae per sample was estimated. For the field samples, a 100-fold dilution of the sample DNA combined with a final concentration of 0.2 μg/μL BSA in the PCR reaction mixture was used to remove real- time PCR inhibitors. Samples collected in Jiaozhou Bay from July to September 2012 were subsequently analyzed using this assay. Peak Aurelia sp.1 planula abundance occurred in July 2012 at stations near Hongdao Island and Qingdao offshore; abundances were very low in August and September. The real-time PCR assay （SYBR Green I） developed here negates the need for traditional microscopic identification, which is laborious and time-consuming, and can detect and quantify jellyfish planulae in field plankton samples rapidly and specifically.

关键词： Aurelia sp. 1 16S rDNA planulae real-time PCR jellyfish blooms

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Evaluating the Effect of Subsurface Structures on Freshwater Lenses in Coral Reefs

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Journal of Ocean University of China 2024年第6期23卷 1551-1560页

作者： ZHANG Zhenchao WANG Han GUO Xiujun key laboratory of marine environmental Science and ecology Ministry of EducationQingdao 266100China Ocean University of China Sanya Oceanographic InstitutionSanya 572000China Shandong Provincial key laboratory of marine environment and Geological Engineering Qingdao 266100China

Freshwater groundwater lenses(FGLs)serve as an important water resource for remote coral atoll islands,and different hydrogeological data of the islands determine the growth and decay of the *** study conducted a three-dimensional(3D)numerical model using hydrogeological data from a reclaimed island to evaluate the effects of different locations and sizes of subsurface structures on the formation and macroscale stability of the *** results revealed that freshwater formation begins earlier than the base model when the subsurface structures are *** underground structures in Pleistocene aquifers leads to a significant increase in freshwater volume with the enlargement of the structure's *** these structures are built within Holocene aquifers,as the burial site moves from the edge towards the center of the area,the maximum freshwater volume decreases slightly,with the largest difference being approximately 4×10^(5) m^(3).When the structure constructed in the Holocene aquifer and its central axis does not coincide with the center of the simulated area,the maximum thickness of the FGLs will be shifted from the center of the simulated area to 20-25 m on the side of the *** constructed in the Pleistocene aquifer,the thickness of the FGLs *** study provides methodology for planning and management of reclaimed lands for water sustainability in the future in coastal areas.

关键词： freshwater lens numerical simulation Yongshu Island subsurface structures formation process steady-state water volume

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