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Picoplankton and virioplankton abundance and community structure in Pearl River Estuary and Daya Bay, south china

Journal of Environmental Sciences 2015年第6期27卷 146-154页

作者： Zhixin Ni Xiaoping Huang Xia Zhang Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of Oceanology Chinese Academy of Sciences south china sea Environmental monitoring center South China Sea Branch of the State Oceanic Administration University of Chinese Academy of Sciences

By using flow cytometry techniques, we investigated the abundance and composition of the heterotrophic prokaryotes, virioplankton and picophytoplankton community in the Pearl River Estuary and Daya Bay in the summer of 2012. We identified two subgroups of prokaryotes, high nucleic acid（HNA） and low nucleic acid（LNA）, characterized by different nucleic acid contents. HNA abundance was significantly correlated with larger phytoplankton and Synechococcus（Syn） abundance, which suggested the important role of organic substrates released from primary producers on bacterial growth. Although LNA did not show any association with environmental variables, it was a vital component of the microbial community. In contrast to previous studies, the total virioplankton concentration had a poor relationship with nutrient availability. The positive relationship between large-sized phytoplankton abundance and the V-I population confirmed that V-I was a phytoplankton-infecting viral subgroup. Although the V-II group（bacteriophages）was dominant in the virioplankton community, it was not related with prokaryotic abundance, which indicated factors other than hosts controlling V-II abundance or the uncertainty of virus-host coupling. With respect to the picophytoplankton community,our results implied that river input exerted a strong limitation to Syn distribution in the estuary, while picoeukaryotes（Euk） were numerically less abundant and showed a quite different distribution pattern from that of Syn, and hence presented ecological properties distinct from Syn in our two studied areas.

关键词： Picoplankton Virioplankton Community composition Flow cytometry

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Assimilating temperature and salinity profiles using Ensemble Kalman Filter with an adaptive observation error and T-S constraint

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Acta Oceanologica Sinica 2016年第1期35卷 30-37页

作者： LIU Danian SHI Ping SHU Yeqiang YAO Jinglong WANG Dongxiao SUN Lu State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China South China Sea Monitoring Center South China Sea Branch State Oceanic Administration Guangzhou 510301 China

Temperature （T） and salinity （S） profiles from conductivity-temperature-depth data collected during the Northern south china sea Open Cruise from August 16 to September 13, 2008 are assimilated using Ensemble Kalman Filter （EnKF）. An adaptive observational error strategy is used to prevent filter from diverging. In the meantime, aiming at the limited improvement in some sites caused by the T and S biases in the model, a T-S constraint scheme is adopted to improve the assimilation performance, where T and S are separately updated at these locations. Validation is performed by comparing assimilated outputs with independent in situ data （satellite remote sensing sea level anomaly （SLA）, the OSCAR velocity product and shipboard ADCP）. The results show that the new EnKF assimilation scheme can significantly reduce the root mean square error （RMSE） of oceanic T and S compared with the control run and traditional EnKF. The system can also improve the simulation of circulations and SLA.

关键词： Ensemble Kalman Filter adaptive observation error T-S constraint

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Using a semi-analytical model to retrieve Secchi depth in coastal and estuarine waters

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Acta Oceanologica Sinica 2020年第8期39卷 103-112页

作者： Xianfu Liu Xuejiao Meng Xiaoyong Wang Dayong Bi Lei Chen Quansheng Lou south china sea Institute of Planning and Environmental Research State Oceanic AdministrationGuangzhou 510300China Shanwei Marine Environmental monitoring center Station State Oceanic AdministrationShanwei 516600China National Ocean Technology center State Oceanic AdministrationTianjin 300112China Environmental monitoring center of south china sea State Oceanic AdministrationGuangzhou 510300China

Secchi depth(SD,m)is a direct and intuitive measure of water's transparency,which is also an indicator of water quality.In 2015,a semi-analytical model was developed to derive SD from remote sensing reflectance,thus able to provide maps of water's transparency in satellite images.Here an in-situ dataset(338 stations)is used to evaluate its potential ability to monitor water quality in the coastal and estuarine waters,with measurements covering the Zhujiang(Pearl)River Estuary,the Yellow sea and the East china sea where measured SD values span a range of 0.2–21.0 m.As a preliminary validation result,according to the whole dataset,the unbiased percent difference(UPD)between estimated and measured SD is 23.3%(N=338,R^2=0.89),with about 60%of stations in the dataset having relative difference(RD)≤20%,over 80%of stations having RD≤40%.Furthermore,by excluding the field data which with relatively larger uncertainties,the semi-analytical model yielded the UPD of 17.7%(N=132,R^2=0.92)with SD range of 0.2–11.0 m.In addition,the semi-analytical model was applied to Landsat-8 images in the Zhujiang River Estuary,and retrieved high-quality mapping and reliable spatial-temporal patterns of water clarity.Taking into account the uncertainties associated with both field measurements and satellite data processing,and that there were no tuning of the semi-analytical model for these regions,these findings indicate highly robust retrieval of SD from spectral techniques for such turbid coastal and estuarine waters.The results suggest it is now possible to routinely monitor coastal water transparency or visibility at high-spatial resolutions from measurements,like Landsat-8 and Sentinel-2 and newly launched Gaofen-5.

关键词： Secchi depth water quality coastal and estuarine waters semi-analytical model remote sensing Landsat-8

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Hydrodynamic characteristics of the double-winged otter board in the deep waters of the Mauritanian sea

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Journal of Oceanology and Limnology 2018年第4期36卷 1417-1424页

作者：宿鑫卢伙胜冯波陈秋杰颜云榕 College of Fisheries Guangdong Ocean University center of south china sea Fisheries Resources monitoring and Assessment Guangdong Ocean University Guangdong Provincial Engineering and Technology Research center of Far sea Fisheries Management and Fishing of south china sea Guangdong Ocean University

In this paper, we tested the hydrodynamic characteristics of a new, double-winged otter board that consists of a forewing, a leading edge slat and a trailing edge flap. Flume experiments were conducted in a circulating flume tank by using a model with an aspect ratio(AR) of 0.85 and a horizontal planform area( S) of 0.09 m^2. The results indicated that the critical angle( α_(cr)) of the model was 44°, whereas the maximum lift coefficient( C_(Lmax)) was up to 1.715, and the door efficiency( K) was 1.122. The attack angle( α) ranged from 30° to 48° and from 10° to 46° when the lift coefficient( C_L) and door efficiency( K) were greater than 1.2 and 1.0, respectively. To compare the difference between double-winged otter board and traditional Morgere Polyvalent Ovale, same model of Morgere Polyvalent Ovale was also tested under the same experimental conditions. The critical angle( α_(cr)) and maximum of lift coefficient( C_(Lmax)) of the doublewinged otter board were 37.5% and 14.6% larger than those of the Morgere Polyvalent Ovale. Therefore, we concluded that the novel, double-winged otter board was more suitable for bottom trawling fisheries in the deep water of the Mauretania sea due to its better hydrodynamic characteristics and stability.

关键词：水动力升力系数稳定性船舶工程

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New record of Japanese snake blenny Xiphasia matsubarai(Perciformes：Blenniidae) from south china sea

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Journal of Oceanology and Limnology 2018年第4期36卷 1401-1407页

作者：易木荣招春旭宿鑫陶雅晋颜云榕 College of Fisheries Guangdong Ocean University Zhanjiang 524088 China center of south china sea Fisheries Resources monitoring and Assessment Guangdong Ocean University Zhanjiang 524088 China Guangdong Provincial Engineering and Technology Research center of Far sea Fisheries Management and Fishing of south china sea Zhanjiang 524088 China

Specimens belonging to the family Blenniidae were collected in a fishery resource investigation from the coastal waters of Xisha Islands and Hainan Island, south china sea in 2016. Combining morphological results with sequence analysis, we identified one specimen as Xiphasia matsubarai Okada & Suzuki, 1952. This represents a new record in the south china sea. In morphology, the specimen has the following traits: body elongated, eel-like or ribbon-like in shape; flanks medium flat; the head small bluntly rounded anteriorly and without a moustache; eyes is slightly smaller, on upper lateral position of head, which is about equal to 1/5 of the length of the head; body without scales, lateral line has been degraded; both sides of the upper and lower jaws with a canine; gill is opening at the top of the pectoral fin base, approximately equal to the length of eye diameter. Dorsal fin Ⅺ, 96; pectoral fin 10; anal fin Ⅱ, 95. Head and body grey-brown, including 26 dark grey-brown bands; abdomen and lower operculum yellowish grey and colour lighter; and dorsal base long with dark grey. Origin of dorsal is located over the anterior margin of pupil; black blotch on dorsal fin between 8 th and 10 th dorsal spine; anal and caudal fins dark grey, pectoral and ventral fins pale yellow. Sequence analysis of cytochrome oxidase subunit I gene( COI) strongly supports the identity of the specimen as Ⅹ. matsubarai.

关键词：西沙群岛鱼生物学生活习性

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Revisiting the seasonal wave height variability in the south china sea with merged satellite altimetry observations

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Acta Oceanologica Sinica 2017年第11期36卷 38-50页

作者： SU Hui WEI Chunlei JIANG Shaocai LI Peiliang ZHAI Fangguo Central Marine Environmental monitoring Station of Xiamen East China Sea BranchState Oceanic Administration Beihai Marine Environmental monitoring center South China Sea BranchState Oceanic Administration College of Oceanic and Atmospheric Sciences Ocean University of China

The seasonal variability of the significant wave height（SWH） in the south china sea（SCS） is investigated using the most up-to-date gridded daily altimeter data for the period of September 2009 to August 2015. The results indicate that the SWH shows a uniform seasonal variation in the whole SCS, with its maxima occurring in December/January and minima in May. Throughout the year, the SWH in the SCS is the largest around Luzon Strait（LS） and then gradually decreases southward across the basin. The surface wind speed has a similar seasonal variation, but with different spatial distributions in most months of the year. Further analysis indicates that the observed SWH variations are dominated by swell. The wind sea height, however, is much smaller. It is the the largest in two regions southwest of Taiwan Island and southeast of Vietnam Coast during the northeasterly monsoon, while the largest in the central/southern SCS during the southwesterly monsoon. The extreme wave condition also experiences a significant seasonal variation. In most regions of the northern and central SCS, the maxima of the 99 th percentile SWH that are larger than the SWH theoretically calculated with the wind speed for the fully developed seas mainly appear in August–November, closely related to strong tropical cyclone activities.Compared with previous studies, it is also implied that the wave climate in the Pacific Ocean plays an important role in the wave climate variations in the SCS.

关键词： significant wave height seasonal variability south china sea satellite observations

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Fluxes of riverine nutrient to the Zhujiang River Estuary and its potential eutrophication effect

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Acta Oceanologica Sinica 2022年第6期41卷 88-98页

作者： Li Zhang Yumin Yang Weihong He Jie Xu Ruihuan Li Marine Environmental Testing center South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Innovation Academy of south china sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Guangdong Environmental monitoring center Guangzhou 510308China College of Marine Science University of Chinese Academy of SciencesQingdao 266404China

The Zhujiang River Estuary is becoming eutrophic due to the impact of anthropogenic activities in the past decades.To understand nutrient dynamics and fluxes to the Lingdingyang water via four outlets(Humen,Jiaomen,Hongqimen and Hengmen),we investigated the spatial distribution and seasonal variation of dissolved nutrients in the Zhujiang River Estuary,based on fourteen cruises conducted from March 2015 to October 2017,covering both wet(April to September)and dry(October to March next year)seasons.Our results showed that riverine fluxes of dissolved inorganic nitrogen(DIN)and dissolved silicate(DSi)into the Lingdingyang water through four outlets varied seasonally due to the influence of river discharge,with the highest in spring and the lowest in winter.However,riverine flux of phosphate exhibited little significant seasonal variability.Riverine nutrients into the Lingdingyang water most resulted through Humen Outlet.The estuarine export fluxes of DIN out of the Zhujiang River Estuary derived from a box model were higher than fluxes of riverine nutrients in May,likely due to the influence of local sewage,while lower than riverine flux in August.The export fluxes of phosphate were higher than the fluxes of riverine phosphate in May and August.In contrast,large amounts of DSi were buried in the estuary in May and August.Although excess DIN was delivered into the Zhujiang River Estuary,eutrophication effect was not as severe as expected in the Zhujiang River Estuary,since the light limitation restricted the utilization of nutrients by phytoplankton.

关键词： riverine nutrient flux Lingdingyang Zhujiang River Estuary eutrophication

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Community structure and biodiversity of free-living marine nematodes in the northern south china sea

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Acta Oceanologica Sinica 2015年第6期34卷 77-85页

作者： LIU Xiaoshou XU Man ZHANG Jinghuai LIU Dan LI Xiao Institute of Evolution & Marine Biodiversity Ocean University of China College of Marine Life Sciences Ocean University of China south china sea Environmental monitoring center State Oceanic Administration

A quantitative study on the community structure and biodiversity of free-living marine nematodes and their relationship with environmental factors in the northern south china sea were carried out based on the samples collected at five stations in the deep sea （from 313 to 1 600 m） and one station in shallowwaters （87 m） during the cruise in September, 2010. Results showed that the abundance of marine nematodes ranged from 224 to 1 996 ind./（10 cm2）. A total of 69 free-living marine nematode genera, belonging to 26 families and three orders, were identified. The most dominant genera were Sabatieria, Linhystera, Aegialoalaimus and Daptonema according to SIMPER analysis. Results of CLUSTER analysis revealed four types of marine nematode community （or station groups） in the sampling area. In terms of trophic structure, non-selective deposit feeders （1B） and selective deposit feeders （1A） were the dominant trophic types with highest genera numbers and abundances, which implied that organic detritus was the main food source of marine nematodes in the northern south china sea. The percentage of male nematode was low, ranging from 2.22% to 17.81%, while those of juvenile individuals ranged from 36.99% to 82.09%. For genera level diversity of marine nematodes, Shannon-Wiener diversity indices （H＇） ranged from 3.76 to 4.57 and had highly significant negative correlation with water depth. In general, diversity indices H＇ at the five stations in deep sea （over 200 m） were lower than that at the station in shallow waters （87 m）. BIOENV analysis showed that the most important environmental factor controlling marine nematode communities was water denth.

关键词： free-living marine nematodes community structure biodiversity deep sea northern south china sea

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Two new species of the genus Nassarius(Gastropoda:Nassariidae) from the south china sea

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Acta Oceanologica Sinica 2021年第9期40卷 90-93页

作者： Suping Zhang Shuqian Zhang Haitao Li Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China south china sea Environmental monitoring center Ministry of Natural ResourcesGuangzhou 510300China center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Two species of Nassarius Duméril, 1805 from the south china sea are described and illustrated. The specimens are in the Nassariidae collection of the Marine Biological Museum of Chinese Academy of Sciences, Qingdao.Nassarius concavus sp. nov., from the sandy bottom at a depth of 180 m, resembles Nassarius glabrus Zhang and Zhang, 2014 in general shell morphology, but differs from the latter in having a smaller, more slender adult shell without axial ribs on the upper teleoconch whorls. Nassarius nanshaensis sp. nov., from the Nansha Islands at a depth of 56–147 m, is similar to Nassarius maxiutongi Zhang, Zhang and Li, 2019 in the shell sculpture, but differs in having a more slender shell with a higher spire, and fewer cusps on the rachidian tooth(9–11 vs. 13–17).

关键词： Gastropoda Nassarius new species south china sea Nansha Islands

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Regulation of Water Masses to Hypoxia Zones in the Changjiang Estuary

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Journal of Ocean University of china 2023年第4期22卷 993-1002页

作者： YANG Xingxing FAN Haimei ZHANG Hui CHEN Sisi YANG Ying JI Huanhong JIANG Xiaoshan DENG Bangping JIA Junhe Donghai Ecological center of the Ministry of Natural Resources Shanghai 201206China Key Laboratory of Marine Ecological monitoring and Restoration Technologies Ministry of Natural Resources(MNR)Shanghai 201206China East china sea Forecast and Disaster Reduction center of the Ministry of Natural Resources Shanghai 200136China

The regulating ways of different water masses affecting the locations and intensities of hypoxia zones were studied based on the time-space continuum data from August 2011 to 2013–2017.The 6-year distribution of the hypoxic area in the Changjiang Estuary(CE)and its adjacent waters show that the hypoxic area can be divided into two segments.The southern segment is out of the south branch of the CE,whereas the northern segment is in the junction zone between the south Yellow sea and the CE.The two segments were divided along the 31.5°–32°N latitude line.The northern and southern segments were dominated by the East china sea shelf water(ECSSW)and Kuroshio subsurface water(KSW),respectively.When the KSW(salinity>34)intrusion reached the east of 123°E and south of 31°N,hypoxia zones mainly occurred in the southern segment covered by the Changjiang Diluted Water(CDW),meanwhile the Yellow sea cold water mass may emerge in the northeastern area.When the KSW intensely invaded westward to the region between 122°and 122.5°E and northward to 31.5°N or further north,hypoxia zones appeared in the northern segment.The strength of the KSW with low dissolved oxygen concentration is the basic driving factor for the hypoxia occurrence in the CE.Moreover,the stratification is crucial for the southern segment,whereas the organic matter decomposition is dominated for the northern segment,even with severe hypoxia across the sea surface in the study area.

关键词： Changjiang Estuary(CE) hypoxia Kuroshio subsurface water(KSW) East china sea shelf water(ECSSW) water masses

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