The distribution of total and electrochemically available copper in the northwestern atlantic ocean     

Douglas L. Huizenga  Dana R. Kester 《Marine Chemistry》1983,13(4):281-291

Copper in a series of samples from the northwestern Atlantic has been determined by anodic stripping voltammetry (ASV) and atomic absorption spectrometry after preconcentration by cobalt—APDC coprecipitation. Samples from a transect across the continental shelf directly off the New York Bight showed a linear relationship between total copper and salinity (31–34‰) and less than 5% of the total copper was detectable by ASV. A slope water station showed less than 9% of the total copper to be ASV detectable in the upper 780m, below which the ASV detectable copper increased to 70% at 3000 m. The Sargasso Sea profiles showed less than 7% ASV detectable copper in the upper 150 m; the fraction of the total copper detected by ASV increased to about 80% of the total copper at greater depths. The reduced availability of copper to the ASV measurement in coastal waters and open ocean surface waters appears to be related to recent contact with waters where biological productivity occurs.  相似文献   

A probabilistic approach for dispersion of oil at sea     

M.H. Fallah  R.M. Stark 《Ocean Engineering》1976,3(3):145-156

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Preservation of enzymic activity in marine plankton by low-temperature freezing     

S.I. Ahmed  R.A. Kenner  F.D. King 《Marine Chemistry》1976,4(2):133-139

The measurement of enzymic activity in plankton communities is useful in the study of marine ecosystems. Such measurements can lead to a clearer understanding of the biological transformations in plankton communities at a particular time. However, the assays are somewhat time-consuming. To facilitate analysis of large numbers of samples, we have developed a method of quick-freezing of whole cells and of cell-free extracts of the diatom, Skeletonema costatum, followed by storage at ?60°C for up to one week. No loss in either the electron transport system (ETS) or the glutamate dehydrogenase (GDH) activity occurs. Similar conditions of storage can be used for the preservation of ETS activity in the marine copepod Calanus pacificus. Also, no measurable loss in either the GDH or the ETS activity is detectable after the quick-frozen whole cells of S. costatum have been kept frozen for over a year.  相似文献   

Some Methods of Binding Prawn Diets and Their Effects on Growth and Assimilation     

Forster  J. R. M. 《ICES Journal of Marine Science》1972,34(2):200-216

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The hydrogen sulphide boundary in the Black Sea in the 1920s and 1980s     

A. A. Bezborodov  V. N. Eremeev 《Physical Oceanography》1991,2(5):407-410

Maps of the boundary topography for anaerobic waters in the Black Sea are plotted for the summers of the 1920s and 1980s. The mean depths of the H₂S boundary for this period are determined. It is shown that the variation in the distribution and average location of the hydrogen sulphide zone has remained constant for the last 60 years.Translated by Mikhail M. Trufanov.  相似文献   

The Indonesian straits incident : Transit or archipelagic sea lanes passage?     

Donald R. Rothwell 《Marine Policy》1990,14(6)

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Maximum likelihood estimates of mortality rates from single-release tagging studies   总被引：4，自引：0，他引：4  

Farebrother  R. W. 《ICES Journal of Marine Science》1988,44(3):229-234

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The application of isotopic and biogeochemical markers to the study of the biochemistry of organic matter in a macrotidal estuary, the Loire, France   总被引：1，自引：0，他引：1  

A. Saliot  J. Tronczynski  P. Scribe  R. Letolle 《Estuarine, Coastal and Shelf Science》1988,27(6)

The biogeochemistry of organic matter in a macrotidal estuary, the Loire, France, has been studied for two years during different seasons. Both particulate matter and sediment have been sampled in the riverine zone, in the maximum turbidity zone and in the ocean near the river mouth. Two techniques have been used: carbon isotopic ratio determination and analysis of lipid-marker signatures in the n-alkane, n-alkene and fatty acid series. For the period corresponding to the output of the maximum turbidity zone in the ocean, the complete change of organic matter, continental in nature in the inner estuary, pure marine in the outer estuary is well illustrated by the decrease of δ¹³C values and of carbon preference index of n-alkanes. Input sources of organic matter by continental plants, plankton and micro-organisms are discussed from biogeochemical-marker analyses data along with the processes of accumulation of particles and their evolution with the season. Some criteria for evidencing the nature of various organic-matter pools are assessed and compared in different chemical-marker series as follows: high molecular weight n-alkanes and fatty acids, perylene for continental imprints, polyunsaturated 18-, 20- and 22-carbon fatty acids, n-C₁₇, n-alkenes and squalene for algae imprints, branched iso and anteiso fatty acids, Δ11-C_18:1 for microbial imprints.  相似文献   

Spectral-temporal structure of variations in the atmospheric total ozone in central Eurasia     

K. N. Visheratin  N. E. Kamenogradskii  F. V. Kashin  V. K. Semenov  V. P. Sinyakov  L. I. Sorokina 《Izvestiya Atmospheric and Oceanic Physics》2006,42(2):184-202

The results of long-term (1980–2003) systematic measurements of the total ozone content at the Issyk Kul station (42.6° N, 77.0° E; 1650 m above sea level) are presented. The statistical characteristics and spectral structure of variations in the total ozone and the main tendencies of its temporal variability are determined. It is found that the total ozone content decreased in 1980–2003 at an average rate of (?1.29±0.08) DU/yr. The results of Fourier and wavelet analyses have shown that only oscillations with periods of 12, 27–29, and 102–105 months are rather stable and can be represented as harmonic oscillations. Oscillations with periods shorter than six months have the character of periodically arising pulsations. Among these, oscillations with periods of 27–29 and 34–37 days can be distinguished. It is noted that the spectral-temporal structure of variations in the total ozone content obtained from ground-based measurements at the Issyk Kul station is in good agreement with the corresponding structure obtained from TOMS satellite measurements.  相似文献   

The estimation of gillnet selection curves for Atlantic herring (Clupea harengus L.) using length/girth relations     

Clarke  D. R.; King  P. E. 《ICES Journal of Marine Science》1986,43(1):77-82

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