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海洋学报（英文版）
海洋学报（英文版）

潘德炉

双月刊

0253-505X

hyxbe@263.net

010-62179976

100081

北京海淀区大慧寺路8号

海洋学报（英文版）/Journal Acta Oceanologica SinicaCSCDCSTPCDSCI
正式出版
收录年代

    Seasonal influence of freshwater discharge on spatio-temporal variations in primary productivity,sea surface temperature,and euphotic zone depth in the northern Bay of Bengal

    Hafez AhmadFelix JoseMd.Simul BhuyanMd.Nazrul Islam...
    1-14页
    查看更多>>摘要：Ocean productivity is the foundation of marine food web,which continuously removes atmospheric carbon dioxide and supports life at sea and on land.Spatio-temporal variability of net primary productivity(NPP),sea surface temperature(SST),sea surface salinity(SSS),mixed layer depth(MLD),and euphotic zone depth(EZD)in the northern Bay of Bengal(BoB)during three monsoon seasons were examined in this study based on remote sensing data for the period 2005 to 2020.To compare the NPP distribution between the coastal zones and open BoB,the study area was divided into five zones(Z1-Z5).Results suggest that most productive zones Z2 and Z1 are located at the head bay area and are directly influenced by freshwater discharge together with riverine sediment and nutrient loads.Across Z1-Z5,the NPP ranges from 5 315.38 mg/(m2·d)to 346.7 mg/(m2·d)(carbon,since then the same).The highest monthly average NPP of 5 315.38 mg/(m2·d)in February and 5 039.36 mg/(m2·d)in June were observed from Z2,while the lowest monthly average of 346.72 mg/(m2·d)was observed in March from Z4,which is an oceanic zone.EZD values vary from 6-154 m for the study area,and it has an inverse correlation with NPP concentration.EZD is deeper during the summer season and shallower during the wintertime,with a corresponding increase in productivity.Throughout the year,monthly SST shows slight fluctuation for the entire study area,and statistical analysis shows a significant correlation among NPP,and EZD,overall positive between NPP and MLD,whereas no significant correlation among SSS,and SST for the northern BoB.Long-term trends in SST and productivity were significantly positive in head bay zones but negatively productive in the open ocean.The findings in this study on the distribution of NPP,SST,SSS,MLD,and EZD and their seasonal variability in five different zones of BoB can be used to further improve the management of marine resources and overall environmental condition in response to climate changes in BoB as they are of utmost relevance to the fisheries for the three bordering countries.
      原文链接:
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    The impact of typhoons on the biogeochemistry of dissolved or-ganic matter in eutrophic bays in northwestern South China Sea

    Xuan LuQibin LaoFajin ChenGuangzhe Jin...
    15-31页
    查看更多>>摘要：Highly productive estuaries facilitate intense decomposition of dissolved organic matter(DOM)as a carbon source.However,the specific impacts of typhoons on DOM decomposition in eutrophic bays remain unclear.To address this issue,we investigated the spectral characteristics of DOM before and after Typhoon Ewiniar in Zhanjiang Bay,a eutrophic semi-enclosed bay in the northwestern South China Sea.The results revealed that intense microbial decomposition of DOM occurred during the pre-typhoon period because high nutrient inputs facilitated the mobilization of DOM in the bay.However,the intrusion of external seawater induced by the typhoon diluted the nutrient levels in Zhanjiang Bay,reducing the impact of microbial decomposition on DOM during the post-typhoon period.Nevertheless,the net addition of DOM occurred in Zhanjiang Bay during the post-typhoon period,possibly because of the decomposition of particulate organic matter(POM)and desorption of particulate matter.In addition,an increase in apparent oxygen utilization,a decrease in DO saturation and the reduced level of Chla indicated that organic matter(OM)decomposition was enhanced and OM decomposition shifted to POM decomposition in Zhanjiang Bay after the typhoon.Overall,our study highlighted the shift in the intense OM decomposition from DOM to POM decomposition before and after typhoons in eutrophic bays,providing new insights into the response of typhoons to biogeochemistry.
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    Tetrabromobisphenol A and hexabromocyclododecane in sedi-ments from the Zhujiang(Pearl)River Estuary and South China Sea

    Chuyue LongWeiyan YangJiaxun LuYuanyue Cheng...
    32-37页
    查看更多>>摘要：Marine sediments collected from the Zhujiang(Pearl)River Estuary(ZRE)and South China Sea(SCS)were utilized to study the occurrence and spatial distribution of tetrabromobisphenol A(TBBPA)and hexabromocyclododecane(HBCDD).The levels of TBBPA and HBCDD in sediments ranged from not detected(nd)to 6.14 ng/g dry weight(dw)and nd to 0.42 ng/g dw.TBBPA concentrations in marine sediments were substantially higher than HBCDD.The concentrations of TBBPA and HBCDD in the ZRE sediments were significantly greater than those in the SCS.α-HBCDD(48.7％)and γ-HBCDD(46.2％)were the two main diastereoisomers of HBCDD in sediments from the ZRE,with minor contribution ofβ-HBCDD(5.1％).HBCDD were only found in one sample from the northern SCS.The enantiomeric fraction of α-HBCDD in sediments from the ZRE was obviously greater than 0.5,indicating an accumulation of(+)-α-HBCDD.The enantiomers of HBCDD were not measured in sediments from the SCS.This work highlighted the environmental behaviors of TBBPA and HBCDD in marine sediments.
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    Distribution and sources of sedimentary organic matter in differ-ent aquaculture areas of northeastern Zhanjiang Bay using stable carbon and nitrogen isotopes

    Fengxia ZhouShuangling WangHan FangJiani He...
    38-48页
    查看更多>>摘要：Zhanjiang Bay is a major aquaculture area in China with many types of mariculture products(such as oysters,fish,and shrimp).The culture area and shrimp output in Zhanjiang Bay are ranked first in China.We investigated the total organic carbon(TOC),total nitrogen(TN),TOC/TN ratio,and stable isotopes(δ13C and δ15N)of the fish and shrimp feed,fish and shrimp feces,and sedimentary organic matter(SOM)in and around different aquaculture areas of northeastern Zhanjiang Bay to study the impact of aquaculture activities on SOM.The average TOC contents of fish and shrimp feed were 39.20％±0.91％and 39.29％±0.21％,respectively.The average TOC content in the surface sediments of the oyster culture area,the mixed(fish and shrimp)culture area,and the cage fish farm area were 0.66％,0.88％±0.10％,and 0.58％±0.19％,respectively,which may indicate that mixed culture had a greater impact on SOM.The relatively high TOC and TN contents and relatively low TOC/TN ratios,and 815N values in the upper layer of the core sediment in the mixed culture area could also support the significant influence of mixed culture.The average δ13C and δ15N values of fish and shrimp feed were-20.6‰±2.2‰ and 1.8‰±1.2‰,respectively,which were different from the isotopic values of SOM in the study area.813C and δ15N values for SOM in different aquaculture areas were different from those of nearby reference stations,probably reflecting the influence of aquaculture.The δ13C and δ15N values in the oyster culture area(-25.9‰ and 6.0‰,respectively)seemed to have reduced δ13C and enriched δ15N relative to those of the reference station(-24.6‰ and 5.8‰,respectively).This may reflect the influence of organic matter on oyster culture.The δ15N value of the station in the mixed culture area(7.1‰±0.4‰)seemed to be relatively enriched in δ15N relative to that of the reference station(6.6‰).Sedimentation and the subsequent degradation of organic matter from mixed cultures may have contributed to this phenomenon.The surface sediment at the cage fish farm area seemed to be affected by fish feces and primary production based on the indication of δ13C and 815N values.The sediment core at the mixed culture region(NS6)had lower TOC/TN ratios and more positive δ13C and 815N values than the sediment core at the oyster culture area,suggesting a higher proportionate contribution of marine organic matter in the mixed culture area.In summary,oyster culture,mixed culture,and cage fish culture in northeastern Zhanjiang Bay had a certain degree of impact on SOM,and mixed culture had more significant influences on SOM based on the high TOC contents and the significant vertical variations of TOC/TN ratio and δ15N value in the sediment of this area.This study provides new insights into the impact of aquaculture activities on SOM content.
      原文链接:
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    A numerical model study on the spatial and temporal variabilit-ies of dissolved oxygen in Qinzhou Bay of the northern Beibu Gulf

    Gaolei ChengShiqiu PengBin YangDongliang Lu...
    49-59页
    查看更多>>摘要：Oxygen facilitates the breakdown of the organic material to provide energy for life.The concentration of dissolved oxygen(DO)in the water must exceed a certain threshold to support the normal metabolism of marine organisms.Located in the northern Beibu Gulf,Qinzhou Bay receives abundant freshwater and nutrients from several rivers which significantly influence the level of the dissolved oxygen.However,the spatial-temporal variations of DO as well as the associated driving mechanisms have been rarely studied through field observations.In this study,a three-dimensional coupled physical-biogeochemical model is used to investigate the spatial and seasonal variations of the DO and the associated driving mechanisms in Qinzhou Bay.The validation against observations indicates that the model can capture the seasonal and inter-annual variability of the DO concentration with the range of 5-10 mg/L.Sensitivity experiments show that the river discharges,winds and tides play crucial roles in the seasonal variability of the DO by changing the vertical mixing and stratification of the water column and the circulation pattern.In winter,the tide and wind forces have strong effects on the DO distribution by enhancing the vertical mixing,especially near the bay mouth.In summer,the river discharges play a dominant role in the DO distribution by inhibiting the vertical water exchange and delivering more nutrients to the Bay,which increases the DO depletion and results in lower DO on the bottom of the estuary salt wedge.These findings can contribute to the preservation and management of the coastal environment in the northern Beibu Gulf.
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    Isotope constraints on seasonal dynamics of nitrogen in Zhanji-ang Bay,a typical mariculture bay in South China

    Chunqing ChenQibin LaoFajin ChenGuangzhe Jin...
    60-70页
    查看更多>>摘要：Eutrophication in coastal waters has been increasing remarkably,severely impacting the water quality in mariculture bays.In this study,we conducted multiple isotopic measurements on suspended particulate nitrogen(δ15N-PN)and dissolved nitrate(δ15N-NO3-and δ18O-NO3-)in Zhanjiang Bay,a typical mariculture bay with a high level of eutrophication in South China,to investigate the changes in nitrogen sources and their cycling between the rainy and dry seasons.During the rainy season,the study found no significant relation between δ15N-PN and δ15N-NO3-due to the impact of heavy rainfall and terrestrial erosion.In the upper bay,a slight nitrate loss and slightly higher δ15N-NO3-and δ18O-NO3-values were observed,attributed to intense physical sediment-water interactions.Despite some fluctuations,nitrate concentrations in the lower bay mainly aligned with the theoretical mixing line during the rainy season,suggesting that nitrate was primarily influenced by terrestrial erosion and that nitrate isotopes resembled the source.Consequently,the isotopic values of nitrate can be used for source apportionment in the rainy season.The results indicated that soil nitrogen(36％)and manure and sewage(33％)were the predominant nitrogen sources contributing to nitrogen loads during this period.In contrast,the dry season saw a deficient ammonium concentration(＜0.2 μmol/L)in the bay,due to nearly complete consumption by phytoplankton during the red tide period.Additionally,the significant loss of nitrate and simultaneous increase in the stable isotopes of dissolved and particulate nitrogen suggest a strong coupling of assimilation and mineralization during the dry season.More active biogeochemical processes during the dry season may be related to decreased runoff and increased water retention time.Overall,our study illustrated the major seasonal nitrogen sources and their dynamics in Zhanjiang Bay,providing valuable insights for formulating effective policies to mitigate eutrophication in mariculture bays.
      原文链接:
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    Effect of dissolved organic nitrogen on the bloom of Proro-centrum donghaiense and Karenia spp.in the East China Sea coastal waters

    Xiaoru CuiGuangming ZhenJing ZhaoKeqiang Li...
    71-85页
    查看更多>>摘要：Understanding the mechanism of harmful algal bloom formation is vital for effectively preventing algal bloom outbreaks in coastal environments.Karenia spp.blooms in the East China Sea show a significant correlation with nutrient regimes.However,the impact of key components of nutrients,especially dissolved organic nitrogen(DON),on the blooms of Karenia spp.is not clear.Quantitative research is still lacking.In this study,the cruise observations,field mesocosm-flask culture experiments,and a multinitrogen-tri-phytoplankton-detritus model(NTPD)are combined to reveal the quantitative influence of nutrient regimes on the shift of Prorocentrum donghaiense and Karenia spp.in the East China Sea.It has a synchronism rhythm of diatom-P.donghaiense-Karenia spp.-diatom loop in the field culture experiment,which is consistent with the results of the cruise observation.The results showed that the processes of terrigenous DON(TeDON)and dissolved inorganic nitrogen(DIN:NO3--N,NH4+-N)absorption promoted P.donghaiense to become the dominant algae in the community;whereas the processes of DON from P.donghaiense absorption promoted Karenia spp.to become the dominant algae in ambient DIN exhaustion.In addition,the three-dimensional fluorescence components of humus C,tyrosine and fulvic acid can indicate the processes of growth and extinction of P.donghaiense and Karenia spp.,respectively.This study infers that P.donghaiense and Karenia spp.regime shift mechanism associated with the nutrient regime in coastal waters,which provides a scientific basis for the environmental management of coastal ecosystem health.
      原文链接:
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    Tracing nitrate sources in one of the world's largest eutrophic-ated bays(Hangzhou Bay):insights from nitrogen and oxygen isotopes

    Zhi YangJianfang ChenHaiyan JinHongliang Li...
    86-95页
    查看更多>>摘要：Eutrophication caused by inputs of excess nitrogen(N)has become a serious environmental problem in Hangzhou Bay(China),but the sources of this nitrogen are not well understood.In this study,the August 2019 distributions of salinity,nutrients[nitrate(NO3-),nitrite,ammonium,and phosphate],and the stable isotopic composition of NO3-(δ15N and δ18O)were used to investigate sources of dissolved inorganic nitrogen(DIN)to Hangzhou Bay.Spatial distributions of nitrate,salinity,and nitrate δ18O indicate that the Qiantang River,the Changjiang River,and nearshore coastal waters may all contribute nitrate to the bay.Based on the isotopic compositions of nitrate in these potential source waters and conservative mixing of nitrate in our study area,we suggest that the NO3-in Hangzhou Bay was likely derived mainly from soils,synthetic N fertilizer,and manure and sewage.End-member modeling indicates that in the upper half of the bay,the Qiantang River was a very important DIN source,possibly contributing more than 50％of DIN in the bay head area.In the lower half of the bay,DIN was sourced mainly from strongly intruding coastal water.DIN coming directly from the Changjiang River made a relatively small contribution to Hangzhou Bay DIN in August 2019.
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    Salinity fronts shape spatial patterns in zooplankton distribution in Hangzhou Bay

    Yepeng XuYiqi WangLin ZhanYijun Ou...
    96-106页
    查看更多>>摘要：Ocean fronts play important roles in nutrient transport and in the shaping ecological patterns.Frontal zones in small bays are typically small in scale,have a complex structure,and they are spatially and temporally variable,but there are limited data on how biological communities respond to this variation.Hangzhou Bay,a medium-sized estuary in China,is an ideal place in which to study the response of plankton to small-scale ocean fronts,because three water masses(Qiantang River Diluted Water,Changjiang River Diluted Water,and the East China Sea current)converge here and form dynamic salinity fronts throughout the year.We investigate zooplankton communities,and temperature,salinity and chlorophyll a(Chl a)in Hangzhou Bay in June(wet period)and December(dry period)of 2022 and examine the dominant environmental factors that affect zooplankton community spatial variability.We then match the spatial distributions of zooplankton communities with those of salinity fronts.Salinity is the most important explanatory variable to affect zooplankton community spatial variability during both wet and dry periods,in that it contributes＞60％of the variability in community structure.Furthermore,the spatial distributions of zooplankton match well with salinity fronts.During December,with weaker Qiantang River Diluted Water and a stronger secondary Changjiang River Plume,zooplankton communities occur in moderate salinity(MS,salinity range 15.6±2.2)and high salinity(HS,22.4±1.7)regions,and their ecological boundaries closely match the Qiantang River Diluted Water front.In June,different zooplankton communities occur in low salinity(LS,3.9±1.0),MS(11.7±3.6)and HS(21.3±1.9)regions.Although the LS region occurs abnormally in the central bay rather than its apex because of the anomalous influence of rising and falling tides during the sampling period,the ecological boundaries still match salinity interfaces.Low-salinity or brackish-water zooplankter taxa are relatively more abundant in LS or MS regions,and the biomass and abundance of zooplankton is higher in the MS region.
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    Coastal hypoxia response to the coupling of catastrophic flood,extreme marine heatwave and typhoon:a case study off the Changjiang River Estuary in summer 2020

    Xiao MaQicheng MengDewang LiYuanli Zhu...
    107-118页
    查看更多>>摘要：Massive bodies of low-oxygen bottom waters are found in coastal areas worldwide,which are detrimental to coastal ecosystems.In summer 2020,the response of coastal hypoxia to extreme weather events,including a catastrophic flooding,an extreme marine heatwave,and Typhoon Bavi,is investigated based on multiple satellite,four cruises,and mooring observations.The extensive fan-shaped hypoxia zone presents significant northward extension during July-September 2020,and is estimated as large as 13 000 km2 with rather low oxygen minimum(0.42 mg/L)during its peak in 28-30 August.This severe hypoxia is attributed to the persistent strong stratification,which is indicated by flood-induced larger amount of riverine freshwater input and subsequent marine heatwave off the Changjiang River Estuary.Moreover,the Typhoon Bavi has limited effect on the marine heatwave and coastal hypoxia in summer 2020.
      原文链接:
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