Magnetic Anomalies over British Columbia and the Adjacent Pacific Ocean

1971 ◽  
Vol 8 (3) ◽  
pp. 387-391 ◽  
Author(s):  
G. V. Haines ◽  
W. Hannaford ◽  
R. P. Riddihough
Keyword(s):  
Magnetic Field ◽  
British Columbia ◽  
Pacific Ocean ◽  
Sea Level ◽  
Magnetic Anomalies ◽  
Canadian Shield ◽  
Vertical Magnetic Field ◽  
Northeast Pacific ◽  
Broad View ◽  
Northeast Pacific Ocean

A contoured residual map of the vertical magnetic field, observed at approximately 5 km altitude above sea level, provides a broad view of the major structures of the buried Canadian Shield, the Cordilleran Region, and the northeast Pacific Ocean.

Regional Magnetic Anomalies of the Canadian Arctic

1973 ◽  
Vol 10 (2) ◽  
pp. 157-163 ◽  
Author(s):  
R. P. Riddihough ◽  
G. V. Haines ◽  
W. Hannaford
Keyword(s):  
Magnetic Field ◽  
Sea Level ◽  
Canadian Arctic ◽  
Arctic Basin ◽  
Magnetic Anomalies ◽  
Canadian Shield ◽  
The Arctic ◽  
Vertical Magnetic Field ◽  
Broad View

A contoured residual map of the vertical magnetic field, observed at an altitude of 3.5 km above sea level, provides a broad view of major tectonic patterns and relations between the Canadian Shield, the Innuitian Region, and the oceanic ridges of the Arctic Basin.

Terebellidae (Polychaeta) from the Northeast Pacific Ocean

1980 ◽  
Vol 37 (1) ◽  
pp. 20-40 ◽  
Author(s):  
Karl Banse
Keyword(s):  
British Columbia ◽  
New Species ◽  
Pacific Ocean ◽  
New Record ◽  
Type Species ◽  
New Genus ◽  
New Records ◽  
Northeast Pacific ◽  
The Antarctic ◽  
Northeast Pacific Ocean

Betapista dekkerae, new genus and new species, is described. The generic diagnoses for Laphania and Scionides are improved after inspection of the holotypes of the type species. Eupolymnia heterobranchia (syn., E. crescentis) is redescribed. Additions to the descriptions, based on study of type material, are made for Laphania boecki (new record, Northeast Pacific), Neoamphitrite robusta (syn., Scionides dux), Neoleprea californica and N. spiralis, Pista brevibrunchiata (new record, British Columbia [B.C.], Washington [WA], Japan) and P. fratrella, and Polycirrus californicus (new record, B.C., WA, syn., P. perplexus). Other additions to the descriptions are provided for Amaeana occidentalis (new record, B.C.) and Pista cristata. Two further Pista species (one from the Skagerrak) and five Polycirrus species are charcterized but not named. Other new records are Lanassa venusta venusta (B.C.), Lysilla loveni, and Neoleprea japonica (the two latter for Northeast Pacific). Lysilla pacifica, Pista fasciata, and P. fratrella are shown not to be members of the fauna of British Columbia and Washington. Presumably, neither is Polycirrus caliendrum. New observations on the types of the Antarctic Polycirrus kerguelensis and Ereutho kerguelensis are noted.Key words: Betapista n.g., Neoleprea, new records, Northeast Pacific, Pista, Polycirrus, Scionides, Terebellidae

New Pogonophora from the northeast Pacific Ocean

1969 ◽  
Vol 47 (3) ◽  
pp. 395-403 ◽  
Author(s):  
Eve C. Southward
Keyword(s):  
British Columbia ◽  
New Species ◽  
Pacific Ocean ◽  
Northeast Pacific ◽  
The Pacific ◽  
A New Species ◽  
Northeast Pacific Ocean

Five species of Pogonophora have been found in collections of benthos from depths of 200 to 2680 meters off the coast of British Columbia, Canada. They include two species already known from the Pacific, Polybrachia canadensis and Siboglinum pusillum; a new species of Lamellisabella, and a new species of Siboglinum. The fifth species is probably another new species of Siboglinum, but the specimens are not sufficiently complete for definite determination.

Bowie Seamount. A Recently Active, Flat-topped Seamount in the Northeast Pacific Ocean

1971 ◽  
Vol 8 (6) ◽  
pp. 676-687 ◽  
Author(s):  
R. H. Herzer
Keyword(s):  
Pacific Ocean ◽  
Shallow Water ◽  
Sea Level ◽  
Volcanic Activity ◽  
West Coast ◽  
Basaltic Magma ◽  
The West ◽  
Northeast Pacific ◽  
Wave Erosion ◽  
Northeast Pacific Ocean

Bowie Seamount, situated off the west coast of Canada at 53° 18′ N, 135° 39′ W, is a long northeast-trending, volcanic mountain comprising a series of intersecting ridges. These ridges may have grown from extrusions along intersecting fractures in the oceanic crust. Two terraces form the flattened summit of the volcano at approximate depths of 80 and 235 m. These are thought to be remnants of platforms produced by combined shallow-water vulcanism and wave erosion during Pleistocene and Recent times when sea level was lower than it is today. The last episode of volcanic activity on the summit occurred after the formation of the upper terrace which is probably no more than 18 000 years old. Samples dredged from the upper half of the volcano include: pillow fragments, fragments of non-pillowed flows, pillow breccias, bombs, tuffs, ash, and unsorted tephra. The rocks are mainly alkali olivine basalts, accompanied by a few intermediate rocks which are believed to have been derived by differentiation of the basaltic magma.

scholarly journals Annual Sea Level Amplitude Analysis over the North Pacific Ocean Coast by Ensemble Empirical Mode Decomposition Method

2021 ◽  
Vol 13 (4) ◽  
pp. 730
Author(s):  
Wen-Hau Lan ◽  
Chung-Yen Kuo ◽  
Li-Ching Lin ◽  
Huan-Chin Kao
Keyword(s):  
Pacific Ocean ◽  
South China Sea ◽  
Sea Level ◽  
South China ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Ensemble Empirical Mode Decomposition ◽  
China Sea ◽  
Northeast Pacific ◽  
Northeast Pacific Ocean

Understanding spatial and temporal changes of seasonal sea level cycles is important because of direct influence on coastal systems. The annual sea level cycle is substantially larger than semi-annual cycle in most parts of the ocean. Ensemble empirical mode decomposition (EEMD) method has been widely used to study tidal component, long-term sea level rise, and decadal sea level variation. In this work, EEMD is used to analyze the observed monthly sea level anomalies and detect annual cycle characteristics. Considering that the variations of the annual sea level variation in the Northeast Pacific Ocean are poorly studied, the trend and characteristics of annual sea level amplitudes and related mechanisms in the North Pacific Ocean are investigated using long-term tide gauge records covering 1950–2016. The average annual amplitude of coastal sea level exhibits interannual-to-decadal variability within the range of 14–220 mm. The largest value of ~174 mm is observed in the west coast of South China Sea. In the other coastal regions of North Pacific Ocean, the mean annual amplitude is relatively low between 77 and 124 mm for the western coast and 84 and 87 mm for the eastern coast. The estimated trend values for annual sea level amplitudes in the western coastal areas of South China Sea and Northeast Pacific Ocean have statistically decreased over 1952–2014 with a range of −0.77 mm·yr−1 to −0.11 mm·yr−1. Our results suggested that the decreasing annual amplitude in the west coast of South China Sea is in good agreement with the annual mean wind stress associated with the Pacific Decadal Oscillation (PDO). This wind phenomenon also explains the temporal variations of annual sea level amplitude in Northeast Pacific Ocean, especially the high correlations since 1980 (R = 0.61−0.72).

First description of Metridia okhotensis Brodsky, 1950 (Crustacea: Copepoda) male, with female, fifth copepodites, and notes on distribution in British Columbia inlets

1986 ◽  
Vol 64 (7) ◽  
pp. 1555-1562
Author(s):  
Ildy Szabo ◽  
Grant A. Gardner
Keyword(s):  
British Columbia ◽  
Body Size ◽  
Pacific Ocean ◽  
Relative Length ◽  
Similar Species ◽  
Male And Female ◽  
Northeast Pacific ◽  
Zooplankton Dynamics ◽  
First Time ◽  
Northeast Pacific Ocean

The male of Metridia okhotensis (Copepoda: Calanoida) is described here for the first time. It can be separated from similar species, including M. longa, a morphologically similar species found in the Atlantic and Arctic oceans, on the basis of body size, the relative length of the first antennae, and the shape of the fifth leg. Here we describe both the fifth and sixth copepodite stages of male and female M. okhotensis, and present a tabular key to members of the genus reported from the northeast Pacific Ocean. In addition, we show that M. okhotensis is widely distributed in the protected waterways of the British Columbia coast, and at times and in some places it is numerically dominant. Particularly high numbers are found in Loughborough and Portland inlets and Douglas Channel. The size of the copepod and of its population suggest it plays an important role in the zooplankton dynamics of British Columbia nearshore waters.

Sabellidae (Polychaeta) Principally from the Northeast Pacific Ocean

1979 ◽  
Vol 36 (8) ◽  
pp. 869-882 ◽  
Author(s):  
Karl Banse
Keyword(s):  
British Columbia ◽  
New Zealand ◽  
Pacific Ocean ◽  
Key Words ◽  
New Combination ◽  
Generic Level ◽  
Diagnostic Characters ◽  
Northeast Pacific ◽  
Specific Rank ◽  
Northeast Pacific Ocean

Morphological and distributional observations are reported for 14 northeast Pacific sabellids, largely using collections from British Columbia and Washington waters, and for one species from New Zealand. For nine of these, additions to the descriptions are provided based on type material. Eudistylia Bush is revised using a new combination of diagnostic characters. Eudistylia catharinae is newly described; E. tenella Bush is regarded as a synonym of E. vancouveri (Kinberg). Diagnostic characters at the generic level, particularly those of Sabella Linnæus, are discussed. Demonax Kinberg, considered to be a subgenus of Sabella, is emended. Distylia volutacornis pacifica Berkeley and Berkeley is elevated to specific rank and referred to Demonax. Jasmineira pacifica Annenkova, Oriopsis gracilis Hartman, and an unnamed species of Sabellastarte Savigny are new additions to the polychaete fauna of British Columbia and Washington. Key words: British Columbia, Demonax, Eudistylia, northeast Pacific, Polychaeta, Sabella, Sabellidae, Washington

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