Simple determination of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) using solid-phase microextraction and gas chromatography-mass spectrometry     

Takushi?NikiEmail author  Taiki?Fujinaga  Mariyo?F.?Watanabe  Junji?Kinoshita 《Journal of Oceanography》2004,60(5):913-917

Solid-phase microextraction (SPME) is a simple, sensitive and less destructive method for the determination of dimethylsulfide (DMS) in seawater. Combined with detection by gas chromatography-mass spectrometry (GC-MS), the method had sufficient sensitivity (minimum detectable concentration of DMS was 0.05 nM), and practical levels of reproducibility (relative standard deviation ≤7%) and linearity (r ² > 0.995) over a wide concentration range (0.5 to 910 nM). The protocol developed was applied to a Sagami Bay water sample to determine concentrations of DMS and DMSP, and in situ DMSP-lyase activity.  相似文献   

太平洋波高分布及变化规律研究   总被引：4，自引：0，他引：4  

韩树宗  朱大勇  郭佩芳 《中国海洋大学学报(自然科学版)》2003,33(6):825-832

使用 Topex/ Poseidon卫星高度计 1 992年 1 0月～ 1 998年 1 2月连续 75个月 ,2 30个重复周期的有效波高资料对南北太平洋的有效波高进行了统计 ,分析了太平洋有效波高的多年平均、多年各月平均和多年各季平均的空间分布特征和时间变化规律。结果表明 ,太平洋波高分布具有明显季节变化的规律 ,与太平洋的风速分布特征具有良好的对应关系  相似文献   

Effect of strong winds on the nutritional condition of anchovy (Engraulis encrasicolus L.) larvae in the Bay of Biscay, Northeast Atlantic, as inferred from an early field application of the DNA/C index     

Bergeron  Jean-Pierre 《ICES Journal of Marine Science》2000,57(2):249-255

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Observations of the Labrador Sea eddy field   总被引：2，自引：0，他引：2  

Jonathan M. Lilly  Peter B. RhinesFriedrich Schott  Kara LavenderJohn Lazier  Uwe SendEric D’Asaro 《Progress in Oceanography》2003,59(1):75-176

This paper is an observational study of small-scale coherent eddies in the Labrador Sea, a region of dense water formation thought to be of considerable importance to the North Atlantic overturning circulation. Numerical studies of deep convection emphasize coherent eddies as a mechanism for the lateral transport of heat, yet their small size has hindered observational progress. A large part of this paper is therefore devoted to developing new methods for identifying and describing coherent eddies in two observational platforms, current meter moorings and satellite altimetry. Details of the current and water mass structure of individual eddy events, as they are swept past by an advecting flow, can then be extracted from the mooring data. A transition is seen during mid-1997, with long-lived boundary current eddies dominating the central Labrador Sea year-round after this time, and convectively formed eddies similar to those seen in deep convection modeling studies apparent prior to this time. The TOPEX / Poseidon altimeter covers the Labrador Sea with a loose “net” of observations, through which coherent eddies can seem to appear and disappear. By concentrating on locating and describing anomalous events in individual altimeter tracks, a portrait of the spatial and temporal variability of the underlying eddy field can be constructed. The altimeter results reveal an annual “pulsation” of energy and of coherent eddies originating during the late fall at a particular location in the boundary current, pinpointing the time and place of the boundary current-type eddy formation. The interannual variability seen at the mooring is reproduced, but the mooring site is found to be within a localized region of greatly enhanced eddy activity. Notably lacking in both the annual cycle and interannual variability is a clear relationship between the eddies or eddy energy and the intensity of wintertime cooling. These eddy observations, as well as hydrographic evidence, suggest an active role for boundary current dynamics in shaping the energetics and water mass properties of the interior region.  相似文献   

Geographic variability in trace element levels in Spartina alterniflora     

J.E. Drifmeyer  B. Redd 《Estuarine, Coastal and Shelf Science》1981,13(6):709-716

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Relationship between Shot-Induced Noise and Shot Interval in Seismic Refraction Experiments at Sea     

Herber  R.  Weigel  W.  Wong  H. K. 《Marine Geophysical Researches》1997,19(3):257-265

Seismic noise induced by the seismic source during continuous profiling reduces the signal-to-noise ratio and hence the data quality. This noise is largely dependent on the shot interval. In this paper, the noise amplitude of refraction seismic records from a special experiment is analysed as a function of the shot interval. An empirical exponential relationship between mean peak noise amplitude and shot interval is deduced. By increasing the shot interval, the induced noise can be minimized on all successive records. This results in an improvement of the data, predominantly the signal-to-noise ratio. Because the seismic signal and the shot-induced noise have nearly the same spectra, the chance of improving the signal-to-noise ratio by stacking is significantly reduced.  相似文献   

Recent changes in the winter distribution and movements of northern Atlantic cod (Gadus morhua Linnaeus, 1758) on the Newfoundland-Labrador Shelf     

Kulka  David W.; Wroblewski  J. S.; Narayanan  Savi 《ICES Journal of Marine Science》1995,52(6):889-902

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Seasonal and interannual variations in the East Sakhalin current revealed by TOPEX/POSEIDON altimeter data     

Naoto Ebuchi 《Journal of Oceanography》2006,62(2):171-183

Seasonal and interannual variations in the East Sakhalin Current (ESC) are investigated using ten-year records of the sea level anomaly (SLA) observed by the TOPEX/POSEIDON (T/P) altimeter. The T/P SLA clearly documents seasonal and interannual variations in the ESC along the east coast of Sakhalin Island, although sea ice masks the region from January to April. Estimates of surface current velocity anomaly derived from T/P SLA are in good agreement with drifting buoy observations. The ESC is strong in winter, with a typical current velocity of 30–40 cm s⁻¹ in December, and almost disappears in summer. Southward flow of the ESC is confined to the shelf and slope region and consists of two velocity cores. These features of the ESC are consistent with short-term observations reported in previous studies. Analysis of the ten-year records of T/P SLA confirms that the structure of the ESC is maintained each winter and the seasonal cycle is repeated every year, although the strength of the ESC shows large interannual variations. Seasonal and interannual variations in the ESC are discussed in relation to wind-driven circulation in the Sea of Okhotsk, using wind stress and wind stress curl fields derived from European Centre for Medium Range Weather Forecasts (ECMWF) reanalysis data and a scatterometer-derived wind product. Seasonal and interannual variations of the anticyclonic eddy in the Kuril Basin are also revealed using T/P SLA.  相似文献   

大亚湾水域两种拟菱形藻的形态学鉴定及毒素分析   总被引：2，自引：0，他引：2  

邢小丽  杨军霞  康燕玉  高亚辉  梁君荣  林旭吟 《台湾海峡》2007,26(4):576-582

对2005年分离自广东大亚湾的两种潜在产毒拟菱形藻进行了形态学观察和毒性分析.通过透射电子显微镜(TEM)观察确认藻种为细弱拟菱形藻(Pseudo-nitzschia cuspidata)和多纹拟菱形藻(P.multistriata).采用高效液相色谱法(HPLC)对这两种藻的常规培养样进行软骨藻酸毒素检测,结果均未检测到软骨藻酸.鉴于以上两种拟菱形藻存在着潜在产毒特性,不同培养条件的诱导实验尚需继续.  相似文献   

陀螺经纬仪的读数方法比较研究   总被引：2，自引：0，他引：2  

万朋  李宗春  李广云  张冠宇  牟爱国 《海洋测绘》2005,25(5):75-78

介绍了陀螺定向测量中三种不同的数据采集方法，分析了各种方法的优缺点。作者认为传感器采集数据自动化程度高，精度高，特别是运用位置敏感探测器（PSD）采样数据量大，具有一定的抗干扰能力，但在运用传感器采样时必须注意克服非线性误差。  相似文献