Effects of sheens associated with offshore oil and gas development on the feather microstructure of pelagic seabirds     

Patrick D. O’Hara  Lora A. Morandin 《Marine pollution bulletin》2010,60(5):672-678

Operational discharges of hydrocarbons from maritime activities can have major cumulative impacts on marine ecosystems. Small quantities of oil (i.e., 10 ml) results in often lethally reduced thermoregulation in seabirds. Thin sheens of oil and drilling fluids form around offshore petroleum production structures from currently permissible operational discharges of hydrocarbons. Methodology was developed to measure feather microstructure impacts (amalgamation index or AI) associated with sheen exposure. We collected feather samples from two common North Atlantic species of seabirds; Common Murres (Uria aalge) and Dovekies (Alle alle). Impacts were compared after feather exposure to crude oil and synthetic lubricant sheens of varying thicknesses. Feather weight and microstructure changed significantly for both species after exposure to thin sheens of crude oil and synthetic drilling fluids. Thus, seabirds may be impacted by thin sheens forming around offshore petroleum production facilities from discharged produced water containing currently admissible concentrations of hydrocarbons.  相似文献   

Seasonal variation in the importance of pelagic fish in the diet of piscivorous fish in the Moray Firth, NE Scotland: a response to variation in prey abundance?   总被引：5，自引：2，他引：3  

Greenstreet  Simon P.R.; McMillan  Julie A.; Armstrong  Eric 《ICES Journal of Marine Science》1998,55(1):121-133

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Can One-Run-Fixed-Arrhenius Kerogen Analysis Provide Comparable Organofacies Results to Detailed Palynological Analysis? A Case Study from a Prospective Mississippian Source Rock Reservoir (Bowland Shale,UK)     

Newport  Sarah M.  Hennissen  Jan A. I.  Armstrong  James P.  Taylor  Kevin G.  Newport  Leo P.  Hough  Edward 《Natural Resources Research》2020,29(3):2011-2031

Natural Resources Research - Organofacies analysis, a fundamental component within source rock appraisal based on the study of kerogen within a source rock, is typically produced from microscopy...  相似文献   

Jupiter at five microns     

K.R. Armstrong  R.B. Minton  G.H. Rieke  F.J. Low 《Icarus》1976,29(2):287-298

Maps of Jupiter at 5 um provide detailed information about the complex of emission features at this wavelength. Previous indications of a correlation between infrared sources and visual features are confirmed with a few significant exceptions. The behavior of Jupiter at 5 um is compared with that of other bodies in the outer solar system. Recent observations indicate emission features on Jupiter at other infrared wavelengths.  相似文献   

Magnetic resonance imaging of the Lake Agassiz–Lake Winnipeg transition     

F. R. Rack  B. J. Balcom  R. P. MacGregor  R. L. Armstrong 《Journal of Paleolimnology》1998,19(3):255-264

As part of the Geologic Survey of Canada (GSC) Lake Winnipeg Study, we have successfully imaged the Lake Agassiz to Lake Winnipeg transition in Section 4 of Core Namao 94-900-122a (i.e., from 313 cm to 465 cm), using a newly-developed magnetic resonance imaging (MRI) technique called SPRITE (Single-Point, Ramped Imaging with T₁ Enhancement). Whole core, gamma-ray attenuation measurements have been used to calculate the bulk porosity of the sediment at 1 cm intervals for comparison with the SPRITE images. Image contrast and image intensities observed in the SPRITE images of Section 4 are related to local porosity and magnetic susceptibility variations. In general, regions of the core with low signal intensity contain high porosity and low magnetic susceptibility. The best contrast between sediment layers is observed from regions of the core with high magnetic susceptibility. High signal intensity is observed from regions with low porosity and/or high magnetic susceptibility.  相似文献   

    

Margaret Armstrong 《Mathematical Geology》1987,19(8):785-787

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An assessment of the acoustic survey technique, RoxAnn, as a means of mapping seabed habitat   总被引：1，自引：3，他引：1  

Greenstreet  Simon P. R.; Tuck  Ian D.; Grewar  Gavin N.; Armstrong  Eric; Reid  David G.; Wright  Peter J. 《ICES Journal of Marine Science》1997,54(5):939-959

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Stock-related effects in the recruitment of North Sea haddock and whiting     

Cook  R. M.; Armstrong  D. W. 《ICES Journal of Marine Science》1986,42(3):272-280

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An application of the annual egg production method to estimate the spawning biomass of cod (Gadus morhua L.), plaice (Pleuronectes platessa L.) and sole (Solea solea L.) in the Irish Sea   总被引：1，自引：0，他引：1  

Armstrong  M. J.; Connolly  P.; Nash  R. D. M.; Pawson  M. G.; Alesworth  E.; Coulahan  P. J.; Dickey-Collas  M.; Milligan  S. P.; O'Neill  M. F.; Witthames  P. R.; Woolner  L. 《ICES Journal of Marine Science》2001,58(1):183-203

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Effects of Roof-Edge Roughness on Air Temperature and Pollutant Concentration in Urban Canyons     

Amir A. Aliabadi  E. Scott Krayenhoff  Negin Nazarian  Lup Wai Chew  Peter R. Armstrong  Afshin Afshari  Leslie K. Norford 《Boundary-Layer Meteorology》2017,164(2):249-279

The influence of roof-edge roughness elements on airflow, heat transfer, and street-level pollutant transport inside and above a two-dimensional urban canyon is analyzed using an urban energy balance model coupled to a large-eddy simulation model. Simulations are performed for cold (early morning) and hot (mid afternoon) periods during the hottest month of the year (August) for the climate of Abu Dhabi, United Arab Emirates. The analysis suggests that early in the morning, and when the tallest roughness elements are implemented, the temperature above the street level increases on average by 0.5 K, while the pollutant concentration decreases by 2% of the street-level concentration. For the same conditions in mid afternoon, the temperature decreases conservatively by 1 K, while the pollutant concentration increases by 7% of the street-level concentration. As a passive or active architectural solution, the roof roughness element shows promise for improving thermal comfort and air quality in the canyon for specific times, but this should be further verified experimentally. The results also warrant a closer look at the effects of mid-range roughness elements in the urban morphology on atmospheric dynamics so as to improve parametrizations in mesoscale modelling.  相似文献