Oceanologica Acta最新文献_第4页

137Cs inventory in sediment near the Rhone mouth: role played by different sources 罗纳河口附近沉积物中137Cs的含量:不同来源的作用

Oceanologica Acta Pub Date : 2003-09-01 DOI: 10.1016/S0399-1784(03)00036-7

Sabine Charmasson

{"title":"137Cs inventory in sediment near the Rhone mouth: role played by different sources","authors":"Sabine Charmasson","doi":"10.1016/S0399-1784(03)00036-7","DOIUrl":"10.1016/S0399-1784(03)00036-7","url":null,"abstract":"<div>The low tidal range of the Mediterranean Sea and the high sediment load of the Rhone induce the formation of an important submarine delta. The 137Cs inventory in sediment on a 480 km2 area near the Rhone mouth reached 19.6 TBq in 1990. The spatial distribution of both sediment accumulation rates and 137Cs concentrations in this area confirm the existence of a spatially well-delimited zone, i.e. the prodelta, where both parameters are the highest. Thus, 40% of the total amount of 137Cs stored in this 480 km2 area was found within the prodelta (30 km2) in the close vicinity of the river mouth. This attests to the efficiency of the 137Cs trapping by the prodelta sediments. A study on the part the different 137Cs sources in the Mediterranean Sea play in contributing to this inventory has been carried out. These sources are (i) direct deposition from both global fallout and the Chernobyl accident, (ii) indirect inputs arising from the erosion of surface soils of the Rhone catchment area that were also contaminated by the previous fallout, (iii) liquid effluents from the nuclear industry into the Rhone waters. Assuming that direct deposition is evenly distributed over the study area (480 km2) and that the particulate 137Cs input from the Rhone is entirely trapped in this same area, these sources account for about 50% of the inventory. These hypotheses are unlikely in a coastal area subject to various physical disturbances but they are conservative enough to assess the lower limit of the nuclear liquid releases contribution to this inventory to be 50%.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00036-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87852191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Biomass, metabolism and nutrition of zooplankton in the Gulf of Lions (NW Mediterranean) 狮子湾(地中海西北部)浮游动物的生物量、代谢和营养

Oceanologica Acta Pub Date : 2003-09-01 DOI: 10.1016/S0399-1784(03)00016-1

Raymond Gaudy , Faïçal Youssara , Frédéric Diaz , Patrick Raimbault

{"title":"Biomass, metabolism and nutrition of zooplankton in the Gulf of Lions (NW Mediterranean)","authors":"Raymond Gaudy , Faïçal Youssara , Frédéric Diaz , Patrick Raimbault","doi":"10.1016/S0399-1784(03)00016-1","DOIUrl":"10.1016/S0399-1784(03)00016-1","url":null,"abstract":"<div>Zooplankton biomass was measured at 20 stations located along five coastal–offshore transects in the Gulf of Lions (NW Mediterranean) during spring 1998 and winter 1999, using two nets equipped with 200 and 80 μm mesh. Biomass was twice as abundant in spring. It increased toward the coast and the west of the gulf and was positively correlated to chlorophyll, primary production and organic particulate matter and negatively to temperature and salinity. The enrichment effect of Rhone river input and the oligotrophic influence of the north Mediterranean current (NMC) were the main distribution factors of zooplankton biomass. Higher biomass was obtained in coastal stations with the 80 μm net, which sampled more efficiently young larval stages and nauplii. Zooplankton metabolic activity (respiration, ammonium and phosphorus excretion) was studied at the inner and outer stations of each transect. Oxygen/nitrogen (O/N) ratio was lower in spring than in winter, indicating that more protein material was used for food, to complete the energy needed for the spring enhancement of secondary production. Nitrogen and phosphorus excreted by zooplankton accounted for 31% and 10% of the primary production requirements in spring and for 32% and >100%, in winter. Grazing impact and secondary production were calculated from respiratory requirements using a K2 value of 0.4 and an assimilation rate of 0.8. Grazing impact ranged between 9% and 69% of the primary production in spring and between 6% and 83% in winter, depending on the stations. The average secondary production was 54 mg C m–2 d–1 in spring and 19 mg C m–2 d–1 in winter, which represents 11% and 12% of the primary production, respectively.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00016-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75154156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 76

Seasonal and interannual variations (1996–2000) of the coastal waters east of the Rhone river mouth as indicated by the SORCOM series 由SORCOM系列显示的罗纳河口以东沿海水域的季节和年际变化(1996-2000年)

Oceanologica Acta Pub Date : 2003-09-01 DOI: 10.1016/S0399-1784(03)00037-9

Walid A.N Younes , Nathaniel Bensoussan , Jean-Claude Romano , Denise Arlhac , Michel-Guy Lafont

{"title":"Seasonal and interannual variations (1996–2000) of the coastal waters east of the Rhone river mouth as indicated by the SORCOM series","authors":"Walid A.N Younes , Nathaniel Bensoussan , Jean-Claude Romano , Denise Arlhac , Michel-Guy Lafont","doi":"10.1016/S0399-1784(03)00037-9","DOIUrl":"10.1016/S0399-1784(03)00037-9","url":null,"abstract":"<div>Between 1996 and 2000, 79 cruises have been achieved following always the same transect between Marseilles and the Rhone river’s mouth. While cruising, salinity, temperature and fluorescence of surface waters (1.5 m) were recorded every minute, in association with precise GPS position. The whole set of data (i.e. 128 measured points per cruise) constitutes the Sorcom series whose synthetic results are presented here. Despite the high spatial and temporal variability encountered between two successive cruises, the regularity and duration of the sampling strategy permitted to define coherent spatial zonation and temporal evolutions. In the Cape Couronne vicinity the dynamic of the eastern extension of the dilution plume clearly changes. Westward, waters are frequently under its influence, but more sporadically to the east, with a less pronounced gradient. In few cases, salinity lowering has been measured up to the gulf of Marseilles. In these two areas, which can be divided in two sub zones, seasonal evolutions are different. In the eastern area (Cape Couronne–Marseilles), the classical rhythm prevailing over marine waters is observed but with earlier phytoplanktonic bloom than usually reported. In the western part, and as getting closer to the Rhone river mouth, a weaker seasonal variability is observed for the phytoplanktonic biomass then salinity and temperature differences remain high. The better knowledge of the eastern dilution plume is of important socio-economical concern due to the numerous population living on this coast and the presence of pollutants in the river waters.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00037-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81593324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Seasonal and inter-annual variability of bacterioplankton biomass at station Kerfix, off Kerguelen Islands, Antarctica 南极洲Kerguelen群岛外Kerfix站浮游细菌生物量的季节和年际变化

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00031-8

Daniel Delille

{"title":"Seasonal and inter-annual variability of bacterioplankton biomass at station Kerfix, off Kerguelen Islands, Antarctica","authors":"Daniel Delille","doi":"10.1016/S0399-1784(03)00031-8","DOIUrl":"10.1016/S0399-1784(03)00031-8","url":null,"abstract":"<div>Between January 1992 and March 1995, the research project Kerfix undertook the first regular non-coastal multiyear acquisition of parameters related to the carbon cycle in the Southern Ocean at a time series station located at 50°40’S-68°25’E, 110 km southwest of the Kerguelen Islands. I present here a general overview of the bacteriological data collected during this survey. Bacterioplankton biomass at Kerfix station was always significantly lower than in the direct vicinity of the Kerguelen Islands. Bacterial abundance decreased from surface to deepest layers (from 106 cells ml–1 in surface layer to 5.0 × 104 cells ml–1 at 1500 m). In contrast, mean cell volume (0.1 μm3) and proportion of free-living bacteria (80%) were relatively constant through the entire water column. The results suggest that a relatively low seasonal and inter-annual variability affect the total bacterial abundance, the mean cell volume and the percentage of free-living cells. The bacterial biomass is at least equivalent to that of phytoplankton in the surface layers. If integrated over the whole water column it reaches values higher than 1 g C m–2 , which are higher than the corresponding values of phototrophic biomass.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00031-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56209303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

The straits of Gibraltar and Kara Gates: a comparison of internal tides 直布罗陀海峡和卡拉盖茨:内部潮汐的比较

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00023-9

Eugene G Morozov , Gregorio Parrilla-Barrera , Manuel G Velarde , Anatoly D Scherbinin

引用次数: 31

Density currents in the two-layer flow: an example of Dardanelles outflow 两层流中的密度流:达达尼尔海峡流出的一个例子

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00015-X

Şükrü T Beşiktepe

引用次数: 41

Plankton communities of the South Atlantic anticyclonic gyre 南大西洋反气旋环流的浮游生物群落

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00014-8

Sergey A Piontkovski , M.R Landry , Zosim Z Finenko , Alexander V Kovalev , Robert Williams , Christopher P Gallienne , Alexey V Mishonov , Valery A Skryabin , Yuri N Tokarev , Viktor N Nikolsky

{"title":"Plankton communities of the South Atlantic anticyclonic gyre","authors":"Sergey A Piontkovski , M.R Landry , Zosim Z Finenko , Alexander V Kovalev , Robert Williams , Christopher P Gallienne , Alexey V Mishonov , Valery A Skryabin , Yuri N Tokarev , Viktor N Nikolsky","doi":"10.1016/S0399-1784(03)00014-8","DOIUrl":"10.1016/S0399-1784(03)00014-8","url":null,"abstract":"<div>Data collected during cruises of the Former Soviet Union (in 1963–1989) and the British Atlantic meridional transect program (in 1995–1999) were used to analyse macroscale patterns in phyto- and zooplankton biomass, size structure, species diversity, chlorophyll a, and plankton bioluminescence in the macroscale anticyclonic gyre of the South Atlantic Ocean. The spatial pattern of bioluminescence intensity was in good agreement with that of remotely sensed (CZCS) chlorophyll a, phosphate, salinity, and copepod species diversity index distributions especially in terms of geographic inclinations of the isolines, both associated with the north-westward pattern off the South equatorial current. Among the 416 copepod species recorded in samples, 51 species were noted throughout the whole gyre. On the other hand, there were a number of species found only in one of the currents. The mesozooplankton biomass size spectra (calculated in carbon units), exhibited a fairly stable slope of the curve from the eastern periphery of the gyre to its centre. The British Atlantic meridional transect program meridional transect through the western part of the gyre showed mesozooplankton size spectra in greater detail between the equator and 50° S. Although the spectra change slowly along the transect as far as 36° S, there is a general trend toward increasing slopes from the equatorial region to the oligotrophic central gyre. The calculated phyto-to-zooplankton ratio indicated that for the tropical anticyclonic gyres, the mesozooplankton carbon biomass could be represented as the exponential function of the phytoplankton carbon.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00014-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73263499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 40

Structure of the artificial hard substrate assemblages in ports in Thermaikos Gulf (North Aegean Sea) 北爱琴海Thermaikos湾港口人工硬基质组合结构研究

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00040-9

Panagiotis Karalis, Chryssanthi Antoniadou, Chariton Chintiroglou

{"title":"Structure of the artificial hard substrate assemblages in ports in Thermaikos Gulf (North Aegean Sea)","authors":"Panagiotis Karalis, Chryssanthi Antoniadou, Chariton Chintiroglou","doi":"10.1016/S0399-1784(03)00040-9","DOIUrl":"10.1016/S0399-1784(03)00040-9","url":null,"abstract":"<div>The present study describes the hard substrate assemblages established on the concrete blocks of three ports placed in gradually longer distances from the main source of pollution in Thermaikos Gulf. The samplings were performed on a seasonal basis for a 2-year period. The data analysis indicates a clear separation of the assemblages from each port. Evenness and Shannon–Weaver diversity indices were calculated and their values were found to be quite high. This fact, combined with the seasonal pattern that these assemblages hold, reveals stability and a good adaptation of their faunistic components to local environmental conditions. A change due to the construction of a new block functioning as a surge barrier was detectable at the station of N. Michaniona. Once again, biomonitoring proves to be essential in order to obtain useful information about the water conditions. Emphasis was laid on the taxa of Polychaeta by analyzing their numerical abundance and their feeding guilds separately. The results were very similar, a fact that supports the opinion that a specific taxonomic group can be used for the description and the monitoring in many different cases.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00040-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56209321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Variability in benthic oxygen fluxes during the winter-spring transition in coastal sediments: an estimation by in situ micro-electrodes and laboratory mini-electrodes 沿海沉积物冬春过渡期间底栖动物氧通量的变异性:原位微电极和实验室微型电极的估计

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00013-6

Bruno Lansard , Christophe Rabouille , Delphine Massias

{"title":"Variability in benthic oxygen fluxes during the winter-spring transition in coastal sediments: an estimation by in situ micro-electrodes and laboratory mini-electrodes","authors":"Bruno Lansard , Christophe Rabouille , Delphine Massias","doi":"10.1016/S0399-1784(03)00013-6","DOIUrl":"10.1016/S0399-1784(03)00013-6","url":null,"abstract":"<div>Two expeditions were achieved at the winter-spring transition in the Golfe de Fos (Mediterranean Sea) at a site situated at 21 m depth. An in situ autonomous oxygen profiler and laboratory oxygen mini-electrodes were used to measure the oxygen distribution in the sediments and calculate the diffusive oxygen fluxes. Clearer waters during the second expedition promoted a rapid shift from a net heterotrophic environment to a photosynthesis-dominated sediment. The diffusive exchange fluxes of oxygen through the sediment-water interface varied from an average consumption of 5.3 mmol m–2d–1 (February) to a net production of 12 mmol m–2 d–1 (March). At both periods, a large spatial heterogeneity was recorded by the different electrodes, with a larger difference between oxygen profiles when photosynthesis was active. This is probably indicative of a coupling between photosynthesis and respiration in hot spots located close to the photosynthetic organisms. The comparison between in situ micro-electrode profiles and laboratory mini-electrode measurements revealed a good agreement when respiration was dominant, but photosynthetic activity was not detected by the laboratory mini-electrode profiles.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00013-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83438744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Evaluation of large-scale unsupervised classification of New Caledonia reef ecosystems using Landsat 7 ETM+ imagery 基于Landsat 7 ETM+影像的新喀里多尼亚珊瑚礁生态系统大尺度无监督分类评价

Oceanologica Acta Pub Date : 2003-06-01 DOI: 10.1016/S0399-1784(03)00012-4

Guénolé Bouvet , Jocelyne Ferraris , Serge Andréfouët

{"title":"Evaluation of large-scale unsupervised classification of New Caledonia reef ecosystems using Landsat 7 ETM+ imagery","authors":"Guénolé Bouvet , Jocelyne Ferraris , Serge Andréfouët","doi":"10.1016/S0399-1784(03)00012-4","DOIUrl":"10.1016/S0399-1784(03)00012-4","url":null,"abstract":"<div>The capacity of the Landsat 7 Enhanced Thematic Mapper Plus sensor to classify the shallow benthic ecosytems of New Caledonia (South Pacific) is tested using a novel unsupervised classification method. The classes are defined by using a set of multiple spectral decision rules based on the image spectral bands. A general model is applied to the entire Southwest lagoon (5500 km2) and tested on three representative sites: a section of the barrier reef, a cay reef flat rich in corals, and a cay reef flat rich in algae and seagrass beds. In the latter one, the classification results are compared with a locally optimized model, with aerial color photographs and extensive ground-truthed observations. Results show that a reconnaissance of the main benthic habitats in shallow areas (<5 m depth) is possible, at a geomorphological scale for coral reef structure and at a habitat scale for seagrass beds. However, results directly issued from the model must be cautiously interpreted according to empirical spatial rules, especially to avoid confusion between coral slopes and shallow dense seagrass.</div>","PeriodicalId":100980,"journal":{"name":"Oceanologica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0399-1784(03)00012-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73355100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 34