A fine resolution model of the eastern North Atlantic between the Azores, the Canary Islands and the Gibraltar Strait

2000 ◽  
Vol 47 (5) ◽  
pp. 875-899 ◽  
Author(s):  
John Johnson ◽  
Ian Stevens
Keyword(s):  
Canary Islands ◽  
North Atlantic ◽  
Resolution Model ◽  
Gibraltar Strait ◽  
Eastern North Atlantic ◽  
Fine Resolution

scholarly journals Sensitivity to open boundary forcing in a fine-resolution model of the Iberian shelf-slope region

1997 ◽  
Vol 15 (1) ◽  
pp. 113-123 ◽  
Author(s):  
I. G. Stevens ◽  
J. A. Johnson
Keyword(s):  
North Atlantic ◽  
Coastal Upwelling ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Wind Fields ◽  
The North ◽  
Shelf Slope ◽  
Resolution Model ◽  
Eastern North Atlantic ◽  
Fine Resolution

Abstract. A fine-resolution primitive equation numerical model is constructed for the Iberian continental shelf and slope region, with open boundaries to the north, south and west. The model is forced by climatological wind fields and relaxed at the surface to climatological temperature and salinity fields. A series of numerical experiments is conducted to investigate the influence of the open boundary conditions. The numerical results include coastal upwelling in summer and a poleward current in winter. The effects of advection of Mediterranean Water and eastern North Atlantic Central Water feature in the circulation. Qualitative comparisons are made with observations.

scholarly journals Characterization of Shallow Oceanic Precipitation using Profiling and Scanning Radar Observations at the Eastern North Atlantic ARM Observatory

2019 ◽  
Author(s):  
Katia Lamer ◽  
Bernat Puigdomènech Treserras ◽  
Zeen Zhu ◽  
Bradley Isom ◽  
Nitin Bharadwaj ◽  
...  
Keyword(s):  
North Atlantic ◽  
Evaluation Studies ◽  
Precipitation Rate ◽  
High Temporal Resolution ◽  
Similar Time ◽  
Ka Band ◽  
Resolution Model ◽  
Eastern North Atlantic ◽  
Constant Altitude ◽  
Oceanic Precipitation

Abstract. Shallow oceanic precipitation variability is documented using 2nd generation radars located at the Atmospheric Radiation Measurement (ARM) Eastern North Atlantic observatory: the Ka-band ARM zenith radar (KAZR2), the Ka-band scanning ARM cloud radar (KaSACR2) and the X-band scanning ARM precipitation radar (XSAPR2). First, the radars and measurement post-processing techniques, including sea clutter removal and calibration against collocated disdrometer and Global Precipitation Mission (GPM) observations are described. Then, we present how a combination of profiling radar and lidar observations can be used to estimate adaptive (in both time and height) parameters that relate radar reflectivity (Z) to precipitation rate (R) in the form Z = αRβ which we use to estimate precipitation rate over the domain observed by XSAPR2. Furthermore, Constant Altitude Plan Position Indicator (CAPPI) gridded XSAPR2 precipitation rate maps are also constructed. Hourly precipitation rate statistics estimated from the three radars differ; that is because KAZR2 is more sensitive to shallow virga and because XSAPR2 suffers from less attenuation that KaSACR2 and as such is best suited to characterize intermittent and mesoscale-organized precipitation. Further analysis reveals that precipitation rate statistics obtained by averaging 12 h of KAZR2 observations can be used to approximate that of a domain of 2500 km2 averaged over similar time periods. However, it was determined that KAZR2 is unsuitable to characterize domain average precipitation rate over shorter periods. But even more fundamentally, these results suggest that observations cannot produce objective domain precipitation estimate and that forward-simulators should be used to guide high temporal-resolution model evaluation studies.

The Vertical Distribution of Pelagic Decapods [Crustacea: Natantia] Collected on the Sond Cruise 1965 I. The Caridea

1970 ◽  
Vol 50 (4) ◽  
pp. 939-960 ◽  
Author(s):  
P. Foxton
Keyword(s):  
Vertical Distribution ◽  
Canary Islands ◽  
North Atlantic ◽  
Depth Range ◽  
Main Interest ◽  
Acoustic Characteristics ◽  
Biological Collections ◽  
Eastern North Atlantic ◽  
The Vertical Distribution ◽  
Principal Elements

This study forms a contribution to a series (Angel, 1969; Clarke, 1969; Baker, 1970; Badcock, 1970) describing the biological results of a detailed investigation of the ecology of an oceanic area located in the eastern North Atlantic, close to the island of Fuerteventura (Canary Islands). The scientific background and objectives of the investigation, conducted during September to December 1965, have been described elsewhere (Currie, Boden & Kampa, 1969). Our main interest lay in the biological composition and acoustic characteristics of sonic scattering layers, and it was therefore considered essential to sample the principal elements of the pelagic fauna within the depth range 0–1000 m in as quantitative and detailed a manner as was technically possible. The resulting biological collections represent a unique body of material, the analysis of which is directly pertinent to the vertical distribution, diurnal migration and ecological interrelationships of the mesopelagic fauna.

Unveiling a surprising diversity of the genus Diopatra Audouin & Milne Edwards, 1833 (Annelida: Onuphidae) in the Macaronesian region (eastern North Atlantic) with the description of four new species

Zootaxa ◽  
2017 ◽  
Vol 4300 (4) ◽  
pp. 505 ◽  
Author(s):  
HANNELORE PAXTON ◽  
ANDRES ARIAS
Keyword(s):  
New Species ◽  
Canary Islands ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Cape Verde ◽  
Scanning Electron Micrographs ◽  
Dichotomous Key ◽  
Eastern North Atlantic ◽  
Eastern North Atlantic Ocean ◽  
Scanning Electron

This study reviews previous records and reports on newly sampled species of the genus Diopatra from Macaronesia, a region comprising five volcanic archipelagos in the eastern North Atlantic Ocean. Of the three species previously known from the eastern North Atlantic and the Mediterranean, D. marocensis and D. micrura are newly reported from the Canary Islands, and the record of D. neapolitana from Madeira is confirmed. The earliest descriptions of Diopatra from Madeira are D. brevicirrus and D. madeirensis; the former is here considered as a nomen dubium, whilst the latter is redescribed, based on new collections from Madeira and the Canary Islands. Diopatra gallardoi, recently described from Namibia, is reported from the Canary Islands. Four new species are described: D. mariae sp. nov. and D. mellea sp. nov. with peristomial cirri (typical Diopatra), and D. budaevae sp. nov. and D. hektoeni sp. nov. (lacking peristomial cirri, previously considered as Epidiopatra); the former three species are from the Canary Islands and the fourth is from Cape Verde Islands. This brings the Diopatra fauna from the Macaronesian region to nine species. Diagnoses and full descriptions are presented for new and redescribed species and extended diagnoses for others, accompanied by detailed illustrations, including scanning electron micrographs and drawings. A dichotomous key to all recognized species is included plus a table summarizing specific diagnostic characters. 

Onuphid polychaetes associated with theCymodocea nodosameadows of La Gomera (Canary Islands, NW Africa) – new species and new records from the eastern North Atlantic

2017 ◽  
Vol 97 (5) ◽  
pp. 857-869 ◽  
Author(s):  
Andrés Arias ◽  
Jorge Núñez ◽  
Hannelore Paxton
Keyword(s):  
New Species ◽  
Canary Islands ◽  
North Atlantic ◽  
New Records ◽  
North Atlantic Ocean ◽  
Western Mediterranean ◽  
Western Mediterranean Sea ◽  
Lateral Organs ◽  
Eastern North Atlantic ◽  
La Gomera

This study recognizes six species of onuphid polychaetes associated with theCymodocea nodosameadows of the Canary Islands. Of these, three species of the genusAponuphis, A. bilineata, A. brementiandA. ornatahave been previously reported from the eastern North Atlantic, whilstA. willsieiwas only known from the western Mediterranean Sea. We describe two new species:Onuphis ericisp. nov. andKinbergonuphis sanmartinisp. nov., of which the latter represents the first discovery of the genusKinbergonuphisin the eastern North Atlantic Ocean. Furthermore, we present brief notes on their ontogeny and ecology and remarks on the presence and microstructure of lateral organs observed in one of the new species.

Migratory patterns, vertical distributions and diets of Abralia veranyi and Abraliopsis morisii (Cephalopoda: Enoploteuthidae) in the eastern North Atlantic

2019 ◽  
Vol 86 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Airam Guerra-Marrero ◽  
Vicente Hernández-García ◽  
Airam Sarmiento-Lezcano ◽  
David Jiménez-Alvarado ◽  
Angelo Santana-del Pino ◽  
...  
Keyword(s):  
Canary Islands ◽  
North Atlantic ◽  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Mantle Length ◽  
Migration Patterns ◽  
Ontogenetic Shifts ◽  
Vertical Distributions ◽  
Migratory Patterns ◽  
Eastern North Atlantic

Abstract Abralia veranyi and Abraliopsis morisii were the most abundant cephalopods caught during epipelagic and mesopelagic surveys off the Canary Islands and accounted for 26% and 35% of the cephalopod catch, respectively. Diel vertical migration patterns were observed in both species. At night, A. veranyi was recorded at depths as shallow as 38–90 m, whereas Abraliopsis morisii occurred at depths of 98–219 m. As individuals grow in mantle length, their diet changes substantially. Abraliopsis morisii showed ontogenetic shifts at 22.9 mm and 35.3 mm dorsal mantle length (DML), while A. veranyi showed ontogenetic shifts at 20.5 mm and 30.9 mm DML. Prior to the first ontogenic shift, both species fed mainly on copepods and mysids. After this shift they fed on larger prey, such as decapods and fish; the diets of larger individuals also contained cephalopods.

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.

A longitudinal study of humpback whales in Irish waters

2015 ◽  
Vol 96 (4) ◽  
pp. 877-883 ◽  
Author(s):  
Conor Ryan ◽  
Pádraig Whooley ◽  
Simon D. Berrow ◽  
Colin Barnes ◽  
Nick Massett ◽  
...  
Keyword(s):  
Longitudinal Study ◽  
North Atlantic ◽  
Spatial Scales ◽  
Humpback Whales ◽  
Migratory Species ◽  
The Public ◽  
Photo Identification ◽  
The North ◽  
Breeding Grounds ◽  
Eastern North Atlantic

Knowledge on the ecology of humpback whales in the eastern North Atlantic is lacking by comparison with most other ocean basins. Humpback whales were historically over-exploited in the region and are still found in low relative abundances. This, coupled with their large range makes them difficult to study. With the aim of informing more effective conservation measures in Ireland, the Irish Whale and Dolphin Group began recording sightings and images suitable for photo-identification of humpback whales from Irish waters in 1999. Validated records submitted by members of the public and data from dedicated surveys were analysed to form a longitudinal study of individually recognizable humpback whales. The distribution, relative abundance and seasonality of humpback whale sighting records are presented, revealing discrete important areas for humpback whales in Irish coastal waters. An annual easterly movement of humpback whales along the southern coast of Ireland is documented, mirroring that of their preferred prey: herring and sprat. Photo-identification images were compared with others collected throughout the North Atlantic (N = 8016), resulting in matches of two individuals between Ireland and Iceland, Norway and the Netherlands but no matches to known breeding grounds (Cape Verde and West Indies). This study demonstrates that combining public records with dedicated survey data is an effective approach to studying low-density, threatened migratory species over temporal and spatial scales that are relevant to conservation and management.

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