On formation of the intermediate water in the Northern Pacific Ocean

1962 ◽  
Vol 51 (1) ◽  
pp. 108-119 ◽  
Author(s):  
Takashi Ichiye
Keyword(s):  
Pacific Ocean ◽  
Intermediate Water ◽  
Northern Pacific

Population genetics, phylogeography, and systematics of the thornyhead rockfishes (Sebastolobus) along the deep continental slopes of the North Pacific Ocean

2000 ◽  
Vol 57 (8) ◽  
pp. 1701-1717 ◽  
Author(s):  
Carol A Stepien ◽  
Alison K Dillon ◽  
Amy K Patterson
Keyword(s):  
Pacific Ocean ◽  
Phylogenetic Trees ◽  
Sequence Data ◽  
North Pacific Ocean ◽  
Geographic Distance ◽  
The North ◽  
Continental Slopes ◽  
Genetic Patterns ◽  
Northern Pacific ◽  
Shortspine Thornyhead

Population genetic, phylogeographic, and systematic relationships are elucidated among the three species comprising the thornyhead rockfish genus Sebastolobus (Teleostei: Scorpaenidae). Genetic variation among sampling sites representing their extensive ranges along the deep continental slopes of the northern Pacific Ocean is compared using sequence data from the left domain of the mtDNA control region. Comparisons are made among the shortspine thornyhead (S. alascanus) (from seven locations), the longspine thornyhead (S. altivelis) (from five sites), which are sympatric in the northeast, and the broadbanded thornyhead (S. macrochir) (a single site) from the northwest. Phylogenetic trees rooted to Sebastes show that S. macrochir is the sister taxon of S. alascanus and S. altivelis. Intraspecific genetic variability is appreciable, with most individuals having unique haplotypes. Gene flow is substantial among some locations and others diverged significantly. Genetic divergences among sampling sites for S. alascanus indicate an isolation by geographic distance pattern. Genetic divergences for S. altivelis are unrelated to the hypothesis of isolation by geographic distance and appear to be more consistent with the hypothesis of larval retention in currents and gyres. Differences in geographic genetic patterns between the species are attributed to life history differences in their relative mobilities as juveniles and adults.

scholarly journals Cloud representation in general-circulation models over the northern Pacific Ocean: A EUROCS intercomparison study

2004 ◽  
Vol 130 (604) ◽  
pp. 3245-3267 ◽  
Author(s):  
A.P. Siebesma ◽  
C. Jakob ◽  
G. Lenderink ◽  
R.A.J. Neggers ◽  
J. Teixeira ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
General Circulation ◽  
General Circulation Models ◽  
Northern Pacific ◽  
Intercomparison Study

scholarly journals N<sub>2</sub> fixation in eddies of the eastern tropical South Pacific Ocean

2016 ◽  
Vol 13 (10) ◽  
pp. 2889-2899 ◽  
Author(s):  
Carolin R. Löscher ◽  
Annie Bourbonnais ◽  
Julien Dekaezemacker ◽  
Chawalit N. Charoenpong ◽  
Mark A. Altabet ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
N2 Fixation ◽  
South Pacific ◽  
Open Ocean ◽  
Cyclonic Eddy ◽  
Geochemical Data ◽  
Intermediate Water ◽  
N Loss ◽  
Mode Water ◽  
South Pacific Ocean

Abstract. Mesoscale eddies play a major role in controlling ocean biogeochemistry. By impacting nutrient availability and water column ventilation, they are of critical importance for oceanic primary production. In the eastern tropical South Pacific Ocean off Peru, where a large and persistent oxygen-deficient zone is present, mesoscale processes have been reported to occur frequently. However, investigations into their biological activity are mostly based on model simulations, and direct measurements of carbon and dinitrogen (N2) fixation are scarce.We examined an open-ocean cyclonic eddy and two anticyclonic mode water eddies: a coastal one and an open-ocean one in the waters off Peru along a section at 16° S in austral summer 2012. Molecular data and bioassay incubations point towards a difference between the active diazotrophic communities present in the cyclonic eddy and the anticyclonic mode water eddies.In the cyclonic eddy, highest rates of N2 fixation were measured in surface waters but no N2 fixation signal was detected at intermediate water depths. In contrast, both anticyclonic mode water eddies showed pronounced maxima in N2 fixation below the euphotic zone as evidenced by rate measurements and geochemical data. N2 fixation and carbon (C) fixation were higher in the young coastal mode water eddy compared to the older offshore mode water eddy. A co-occurrence between N2 fixation and biogenic N2, an indicator for N loss, indicated a link between N loss and N2 fixation in the mode water eddies, which was not observed for the cyclonic eddy. The comparison of two consecutive surveys of the coastal mode water eddy in November 2012 and December 2012 also revealed a reduction in N2 and C fixation at intermediate depths along with a reduction in chlorophyll by half, mirroring an aging effect in this eddy. Our data indicate an important role for anticyclonic mode water eddies in stimulating N2 fixation and thus supplying N offshore.

Associations between seabirds and water-masses in the northern Pacific Ocean in summer

1989 ◽  
Vol 103 (1) ◽  
pp. 1-11 ◽  
Author(s):  
T. R. Wahl ◽  
D. G. Ainley ◽  
A. H. Benedict ◽  
A. R. DeGange
Keyword(s):  
Pacific Ocean ◽  
Water Masses ◽  
Northern Pacific

Gonadal histology and serum vitellogenin levels of bigeye tuna Thunnus obesus from the Northern Pacific Ocean––absence of endocrine disruption bio-indicators

2003 ◽  
Vol 46 (4) ◽  
pp. 459-465 ◽  
Author(s):  
Shinya Hashimoto ◽  
Ryo Kurihara ◽  
Carlos Augusto Strüssmann ◽  
Tsugiko Yamasaki ◽  
Kiyoshi Soyano ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Endocrine Disruption ◽  
Bigeye Tuna ◽  
Thunnus Obesus ◽  
Gonadal Histology ◽  
Northern Pacific

Dissolved Inorganic Radiocarbon in the Northwest Pacific Continental Margin

Radiocarbon ◽  
2016 ◽  
Vol 58 (3) ◽  
pp. 517-529 ◽  
Author(s):  
Tiantian Ge ◽  
Xuchen Wang ◽  
Jing Zhang ◽  
Chunle Luo ◽  
Yuejun Xue
Keyword(s):  
Pacific Ocean ◽  
Dissolved Inorganic Carbon ◽  
Kuroshio Current ◽  
Northwest Pacific ◽  
Intermediate Water ◽  
High Concentration ◽  
Northwest Pacific Ocean ◽  
Modified Method ◽  
The Northwest Pacific Ocean ◽  
Shelf Region

AbstractThis article presents a modified method for extraction of dissolved inorganic carbon (DIC) from seawater for radiocarbon measurement by accelerator mass spectrometry (AMS). Standard tests indicate that the extraction efficiencies of DIC are >96%, and the respective precisions of Δ14C-DIC and δ13C-DIC analyses are 6‰ and 0.1‰ or better. Using the method, we report Δ14C-DIC profiles collected from the shelf and slope in the East China Sea (ECS) of the northwest Pacific Ocean. Both the DIC concentration and Δ14C-DIC in the shelf and slope regions seem primarily affected by the Kuroshio Current. It is estimated that 54–65% of the bottom water in the shelf region could be from the intrusion of Kuroshio intermediate water, which carries a high concentration and low Δ14C values of DIC, and which influenced the DIC and its 14C signature on the shelf. Compared with the Δ14C-DIC profiles at other sites in the northwest Pacific reported previously, it appears that the Δ14C-DIC distributions are mainly controlled by the major oceanic currents in the region, and large variations in Δ14C-DIC occurred mostly in the upper 800 m of the water column. The similarity of Δ14C-DIC at depth suggests that the deep-water circulation patterns have been relatively stable in the northwest Pacific Ocean in the last 20 yr.

scholarly journals Observations of the Intermediate Water Exchange Between the South China Sea and the Pacific Ocean Deduced From Transient Tracer Measurements

2018 ◽  
Vol 123 (10) ◽  
pp. 7495-7510 ◽  
Author(s):  
Hengxiang Deng ◽  
Peng Huang ◽  
Toste Tanhua ◽  
Tim Stöven ◽  
Hongwei Ke ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
South China Sea ◽  
South China ◽  
Water Exchange ◽  
The South China Sea ◽  
Intermediate Water ◽  
China Sea ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Transient Tracer

A new species of the mesopelagic isopod genus Xenuraega Tattersall, 1909 (Crustacea: Isopoda: Aegidae) from Japan, the second species in the genus

Zootaxa ◽  
2019 ◽  
Vol 4683 (3) ◽  
pp. 431-438
Author(s):  
MICHITAKA SHIMOMURA ◽  
NIEL L. BRUCE
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
North Atlantic ◽  
Type Locality ◽  
Single Specimen ◽  
Southern Japan ◽  
Kagoshima Prefecture ◽  
Northern Pacific ◽  
A New Species

Xenuraega bythionekta sp. nov., is described from a single specimen taken off southern Japan. It is the second species of Xenuraega Tattersall, 1909, and extends the known range of the genus from North Atlantic to the northern Pacific Ocean. The species is characterized by the posteriorly narrowed pleotelson, and both uropodal rami being elongate and provided with a mass of long plumose setae. Xenuraega bythionekta sp. nov. is known only from the type locality, Kagoshima Prefecture, southern Japan at a depth of 1178–1179 m. 

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