Organic geochemical study of the Upper Kimmeridge Clay of the Dorset type area     

Paul Farrimond  Paul Comet  Geoffrey Eglinton  Richard P. Evershed  Michael A. Hall  David W. Park  Anthony M.K. Wardroper 《Marine and Petroleum Geology》1984,1(4):340-354

Results are presented from an organic geochemical investigation of a suite of rock samples taken from the Upper Kimmeridge Clay near Kimmeridge, Dorset. All samples contain immature organic matter of marine origin, although one horizon, the Whitestone Band, contains an additional secondary input of partially biodegraded mature hydrocarbons, due to an oil seepage of unknown origin. With the exception of increased relative abundances of 4-methylsteroidal hydrocarbons in the more organic-rich samples, the immature molecular distributions are very similar, suggesting a consistent source of organic matter. The results are in agreement with the palaeoenvironmental model proposed by Tyson et al. (1979) for the deposition of the Kimmeridge Clay, where the different lithologies are controlled by a fluctuating oxic/anoxic boundary, with only the organic-poor mudstones being deposited in relatively oxygenated waters.  相似文献   

Micropaleontological,mineralogical, and geochemical record in late quaternary cores from abyssal Grenada Basin     

Barun K. Sen Gupta  Michel Pujos  J.- C. Pons  James J. Galluzzo  Paul Aharon  M. Parra 《Geo-Marine Letters》1991,11(1):2-8

Clay mineralogy and trace-element geochemistry of two abyssal cores indicate that the primary source of surface-current-transported detrital material in the southern Grenada Basin changed from a continental, South American terrane to a volcanic, Lesser Antillean terrane at the end of the Pleistocene. The record of benthic foraminiferal assemblages demonstrates that the Caribbean Bottom Water (CBW) was relatively oxygen poor and less corrosive in late Pleistocene glacial times than in interglacial times. The change in the properties of CBW in the Holocene was related to a renewed influx of North Atlantic Deep Water in the Caribbean.  相似文献   

Station Papa Time Series: Insights into Ecosystem Dynamics     

Paul J. Harrison 《Journal of Oceanography》2002,58(2):259-264

The Northeast Pacific has one of the longest time series of any open ocean station, primarily as a result of the weathership station at Station P from the 1950s to 1981. This review summarizes our understanding of the plankton ecosystem for this station and examines interannual variability for the primary producers. The weathership era characterized a period of high temporal sampling resolution with a limited number of parameters being measured. In contrast, the post-weathership period focussed on seasonal sampling (usually three times per year), but a wider range of parameters were measured and sediment traps were deployed to estimate carbon and opal flux rates. The mixed layer depth is shallow compared to the Atlantic Ocean, ranging from 40 to 120 m in late summer and winter respectively. Nitrate, silicate and phosphate are saturating year round with only a few exceptions in the 1970s. Winter and summer Si:N ratios are the same (1.5:1). Ammonium and urea are 0.5 uM in winter and near detection limits (∼0.1 uM) in late summer. Iron is limiting (∼0.05 nM) in late spring and summer for the growth of large diatoms, but iron is co-limiting with irradiance in winter. Chlorophyll and primary productivity are low and show little seasonal variation (about 2 times). Summer chl is about 20 mg m⁻² while primary productivity ranges from 400–850 mg C m⁻²d⁻¹. The f-ratio of 0.25 does not vary with seasons and indicates that primary productivity is fueled by regenerated nitrogen (e.g. NH₄ and urea). Small cells (<5 um) are normally abundant and they utilize regenerated nitrogen produced by the micrograzers; they do not appear to be Fe-limited, but rather controlled by the micrograzers. Shipboard carboy experiments indicate that large diatoms become dominant when iron is added. Therefore top down control is exerted by the micrograzers on the small cells, while there is bottom up control of the large phytoplankton due to low Fe concentrations. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Estimating high resolution trawl fishing effort from satellite-based vessel monitoring system data   总被引：6，自引：0，他引：6  

Mills  Craig M.; Townsend  Sunny E.; Jennings  Simon; Eastwood  Paul D.; Houghton  Carla A. 《ICES Journal of Marine Science》2007,64(2):248-255

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Ice-rafted volcanic ash in the South Atlantic sector of the Southern Ocean during the last 100,000 years     

David G Smith  Michael T Ledbetter  Paul F Ciesielski 《Marine Geology》1983,53(4):291-312

Eucampia antarctica (Castr.) Mangin abundance curves for two piston cores from the western Agulhas Basin (southeast Atlantic sector of the Southern Ocean) were used to place volcanic glass shard and ice-rafted debris abundance curves into a stratigraphic framework for the last 100,000 years. A direct correlation is shown between increased abundance of E. antarctica, tephra and ice-rafted debris; low abundances are often characterized by calcareous sediment in the northern core. Peaks in abundance of E. antarctica have been interpreted as an indication of glacial periods and the increased ice-rafted debris and tephra during glacial periods is evidence for an ice-rafted origin for the tephra.Microprobe geochemical analysis of volcanic glass shards provides no single distinct source for the ash. The geochemical data is consistent, but not definitive, with a primary source in the Scotia Arc and a minor source from Bouvet Island. Between core correlations of geochemically “fingerprinted” dispersed tephra zones were not successful due to variability of glass shard geochemistry and limited sample size.  相似文献   

The daily fecundity reduction method: a new procedure for estimating adult fish biomass     

Lo  N. Chyan-huei; Hunter  John R.; Moser  H. Geoffrey; Smith  Paul E.; Methot  Richard D. 《ICES Journal of Marine Science》1992,49(2):209-215

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Influence of wavelength on the parameterization of drag coefficient and surface roughness     

Paul A. Hwang 《Journal of Oceanography》2004,60(5):835-841

Surface waves are the roughness element of the ocean surface, the air-sea interaction processes are influenced by the wave conditions. The dynamic influence of surface waves decays exponentially with distance from the air-water interface. The relevant length scale characterizing the decay rate is the wavelength. The parameterization of drag coefficient and surface roughness can be significantly improved by using wavelength as the reference length scale of atmospheric measurements. The wavelength scaling of drag coefficient and dynamic roughness also receives support from theoretical studies of wind and wave coupling.  相似文献   

Movements and survival of sonically tagged farmed Atlantic salmon released in Cobscook Bay, Maine, USA     

Whoriskey  Frederick G.; Brooking  Paul; Doucette  Gino; Tinker  Stephen; Carr  Jonathan W. 《ICES Journal of Marine Science》2006,63(7):1218-1223

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Environmental models for predicting oceanic dolphin habitat in the Northeast Atlantic   总被引：1，自引：0，他引：1  

Hastie  Gordon D.; Swift  Rene J.; Slesser  George; Thompson  Paul M.; Turrell  William R. 《ICES Journal of Marine Science》2005,62(4):760-770

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Reference and current Trophic Level Index of New Zealand lakes: benchmarks to inform lake management and assessment     

Jonathan M. Abell  Paul van Dam-Bates  Deniz Özkundakci  David P. Hamilton 《新西兰海洋与淡水研究杂志》2020,54(4):636-657

ABSTRACT

Knowledge of trophic status is fundamental to understanding the condition and function of lake ecosystems. We developed regression models to predict chlorophyll a concentrations (chl a) in New Zealand lakes for reference and current states, based on an existing dataset of total nitrogen (TN) and total phosphorus (TP) concentrations for 1031 lakes. Models were then developed to predict Secchi depth based on chl a and a sediment resuspension term applicable to shallow lakes. Estimates of all four Trophic Level Index (TLI) variables (chl a, TN, TP and Secchi depth) were analysed to estimate reference and current state TLI for the nationally representative sample of 1031 lakes. There was a trend of eutrophication between reference and current states, with systematic differences among lake geomorphic types. Mean chl a increased 3.5-fold (2.42?mg?m^?3 vs. 8.32?mg?m^?3) and mean Secchi depth decreased (indicating lower clarity) by approximately one-third (9.62?m vs. 6.48?m) between reference and current states. On average, TLI increased by 0.67, with the TLI increase >1 in approximately one-third (31%) of lakes. This study informs the status of lake ecosystems in NZ and provides benchmarks to guide management and assessment.  相似文献