scholarly journals Bio-optical characteristics of coastal waters: Absorption spectra of phytoplankton and pigment distribution in the western North Atlantic

1992 ◽  
Vol 37 (8) ◽  
pp. 1660-1679 ◽  
Author(s):  
Nicolas Hoepffner ◽  
Shubha Sathyendranath
Keyword(s):  
Absorption Spectra ◽  
North Atlantic ◽  
Coastal Waters ◽  
Optical Characteristics ◽  
Pigment Distribution

Monthly satellite-derived phytoplankton pigment distribution for the North Atlantic Ocean basin

Eos ◽  
1986 ◽  
Vol 67 (44) ◽  
pp. 835 ◽  
Author(s):  
W. E. Esaias ◽  
G. C. Feldman ◽  
C. R. McClain ◽  
J. A. Elrod
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ocean Basin ◽  
Phytoplankton Pigment ◽  
The North ◽  
Pigment Distribution ◽  
The North Atlantic

Temperature, Salinity and Plankton in the Eastern North Atlantic and Coastal Waters of Britain, 1957.: I. The Characterisation and Distribution of Surface Waters

1963 ◽  
Vol 20 (3) ◽  
pp. 789-826 ◽  
Author(s):  
B. McK. Bary
Keyword(s):  
North Sea ◽  
North Atlantic ◽  
Coastal Waters ◽  
Water Bodies ◽  
English Channel ◽  
Oceanic Water ◽  
Climatic Fluctuations ◽  
The North ◽  
The North Sea ◽  
Eastern North Atlantic

Monthly temperature-salinity diagrams for 1957 have demonstrated that three surface oceanic "water bodies" were consistently present in the eastern North Atlantic; two are regarded as modified North Atlantic Central water which give rise to the third by mixing. As well in the oceanic areas, large and small, high or low salinity patches of water were common. Effects of seasonal climatic fluctuations differed in the several oceanic water bodies. In coastal waters, differences in properties and in seasonal and annual cycles of the properties distinguish the waters from the North Sea, English Channel and the western entrance to the Channel.The geographic distributions of the oceanic waters are consistent with "northern" and "southern" water bodies mixing to form a "transitional" water. Within this distribution there are short-term changes in boundaries and long-term (seasonal) changes in size of the water bodies.Water in the western approaches to the English Channel appeared to be influenced chiefly by the mixed, oceanic transitional water; oceanic influences in the North Sea appear to have been from northern and transitional waters.

scholarly journals Artificial light in baited pots substantially increases the catch of cod (Gadus morhua) by attracting active bait, krill (Thysanoessa inermis)

2018 ◽  
Vol 75 (6) ◽  
pp. 2257-2264 ◽  
Author(s):  
Odd-Børre Humborstad ◽  
Anne Christine Utne-Palm ◽  
Michael Breen ◽  
Svein Løkkeborg
Keyword(s):  
Light Source ◽  
North Atlantic ◽  
Coastal Waters ◽  
Gadus Morhua ◽  
Catch Rate ◽  
Light Sources ◽  
The North ◽  
Important Prey ◽  
Large Numbers ◽  
Per Se

Abstract The use of pots in the north Atlantic finfish fisheries is negligible because this fishing method typically has a low capture efficiency. Large numbers of individuals encounter baited pots, but the proportions of fish that enter the pot and become caught are low. Krill, which constitutes an important prey for cod (Gadus morhua), is attracted by light. The catching efficiency of baited cod pots with three light sources with different colours and intensities (white: 9744 mW m−2, white: 23 mW m−2, green: 8 mW m−2) were tested in coastal waters in northern Norway. Pots with the light source of highest intensity gave a 17 times higher catch rate of cod than that of control pots (with bait only). The light source of medium intensity gave about a five times higher catch rate, whereas the weakest light did not influence the catch. Cod caught in pots with light had more krill and arrowworms in their stomach and were observed feeding on these preys inside the pot. We concluded that light sources of increasing intensity attract more krill, and that cod were attracted into the pot by the dense swarms of prey and not the light per se.

Northern Range Extension of the Atlantic Mackerel, Scomber scombrus, to Black Island, Labrador

1970 ◽  
Vol 27 (3) ◽  
pp. 610-613 ◽  
Author(s):  
L. S. Parsons
Keyword(s):  
North Atlantic ◽  
Coastal Waters ◽  
Range Extension ◽  
Range Limit ◽  
Atlantic Mackerel ◽  
Scomber Scombrus ◽  
Northern Range Limit

During August 1969, 785 specimens of Scomber scombrus were captured in southern Labrador coastal waters, extending the known range in the western North Atlantic to Black Island, Labrador, more than 50 miles north of Triangle Harbour, the previously authenticated northern range limit.

Optical characteristics of coastal waters and atmosphere near the south coast of the crimea at the end of summer 2008

2010 ◽  
Vol 20 (3) ◽  
pp. 207-230
Author(s):  
V. I. Man’kovskii ◽  
G. A. Tolkachenko ◽  
E. B. Shibanov ◽  
O. V. Martynov ◽  
E. N. Korchemkina ◽  
...  
Keyword(s):  
Coastal Waters ◽  
South Coast ◽  
Optical Characteristics ◽  
The South ◽  
The Crimea

scholarly journals The harbour porpoise (Phocoena phocoena) in the North Atlantic: Variability in habitat use, trophic ecology and contaminant exposure

2003 ◽  
Vol 5 ◽  
pp. 223 ◽  
Author(s):  
Arne Bjørge
Keyword(s):  
Habitat Use ◽  
North Atlantic ◽  
Coastal Waters ◽  
Trophic Ecology ◽  
Point Sources ◽  
Phocoena Phocoena ◽  
Cetacean Species ◽  
Contaminant Exposure ◽  
The North ◽  
Management Plans

Harbour porpoises inhabit coastal waters, in habitats that are characterized by high diversity and complexity in terms of their bathymetry, substrate, fish communities and point sources of contaminants. The complexity in these habitats influences both the habitat use and feeding ecology of porpoises. Congregations of porpoises feeding primarily on one species are observed in some areas and seasons, while wide movements and diets composed of several species are observed in other areas. Due to these observations, this paper suggests that caution is needed when extrapolatingknowledge from one area to another with regard to porpoise habitat use, exposure to contaminants, and interactions with fisheries. Management plans should be site specific and based on local knowledge incorporating porpoise population structure, habitat use, and multiple environmental factors in order to ensure appropriate conservation of this abundant but still vulnerable small cetacean species.

scholarly journals Inversion of the volume scattering function and spectral absorption in coastal waters with biogeochemical implications

2013 ◽  
Vol 10 (6) ◽  
pp. 9003-9041
Author(s):  
X. Zhang ◽  
Y. Huot ◽  
D. J. Gray ◽  
A. Weidemann ◽  
W. J. Rhea
Keyword(s):  
Absorption Spectra ◽  
Coastal Waters ◽  
Chlorophyll Concentration ◽  
Hplc Method ◽  
Scattering Coefficient ◽  
Spectral Absorption ◽  
Volume Scattering ◽  
Total Scattering ◽  
Inherent Optical Properties ◽  
Complete Set

Abstract. In the aquatic environment, particles can be broadly separated into phytoplankton (PHY), non-algal particle (NAP) and dissolved (or very small particle, VSP) fractions. Typically, absorption spectra are inverted to quantify these fractions, but volume scattering functions (VSFs) can also be used. Both absorption spectra and VSFs were used to calculate particle fractions for an experiment in Chesapeake Bay. A complete set of water inherent optical properties was measured using a suite of commercial instruments and a prototype Multispectral Volume Scattering Meter (MVSM); the chlorophyll concentration, [Chl] was determined using the HPLC method. The total scattering coefficient (measured by an ac-s) and the VSF (at a few backward angles, measured by a HydroScat 6 and an ECO-VSF) agreed with the LISST and MVSM data within 5%, thus indicating inter-instrument consistency. The size distribution and scattering parameters for PHY, NAP and VSP were inverted from measured VSFs. For the absorption inversion, the "dissolved" absorption spectra were measured for filtrate passing through a 0.2 μm filter, whereas [Chl] and NAP absorption spectra were inverted from the particulate fraction. Even though the total scattering coefficient showed no correlation with [Chl], estimates of [Chl] from the VSF-inversion agreed well with the HPLC measurements (r = 0.68, mean relative error s = −20%). The scattering associated with NAP and VSP both correlated well with the NAP and "dissolved" absorption coefficients, respectively. While NAP dominated forward, and hence total, scattering, our results also suggest that the scattering by VSP was far from negligible and dominated backscattering.

scholarly journals Effects of a sewage plume on the biology, optical characteristics, and particle size distributions of coastal waters

1997 ◽  
Vol 102 (C11) ◽  
pp. 25061-25071 ◽  
Author(s):  
A. A. Petrenko ◽  
B. H. Jones ◽  
T. D. Dickey ◽  
M. LeHaitre ◽  
C. Moore
Keyword(s):  
Particle Size ◽  
Coastal Waters ◽  
Optical Characteristics ◽  
Size Distributions ◽  
Particle Size Distributions
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