scholarly journals NEMURO—a lower trophic level model for the North Pacific marine ecosystem

2007 ◽  
Vol 202 (1-2) ◽  
pp. 12-25 ◽  
Author(s):  
Michio J. Kishi ◽  
Makoto Kashiwai ◽  
Daniel M. Ware ◽  
Bernard A. Megrey ◽  
David L. Eslinger ◽  
...  
Keyword(s):  
Trophic Level ◽  
North Pacific ◽  
Marine Ecosystem ◽  
Lower Trophic Level ◽  
The North ◽  
Level Model ◽  
The North Pacific

Increased Stratification and Decreased Lower Trophic Level Productivity in the Oyashio Region of the North Pacific: A 30-Year Retrospective Study

2004 ◽  
Vol 60 (1) ◽  
pp. 149-162 ◽  
Author(s):  
Sanae Chiba ◽  
Tsuneo Ono ◽  
Kazuaki Tadokoro ◽  
Takashi Midorikawa ◽  
Toshiro Saino
Keyword(s):  
Retrospective Study ◽  
Trophic Level ◽  
North Pacific ◽  
Oyashio Region ◽  
Lower Trophic Level ◽  
The North ◽  
The North Pacific

scholarly journals Response of lower trophic level ecosystems to decadal scale variation of climate system in the North Pacific Ocean

2018 ◽  
Vol 27 (1) ◽  
pp. 43-57
Author(s):  
Maki Noguchi-Aita ◽  
Sanae Chiba ◽  
Kazuaki Tadokoro
Keyword(s):  
Pacific Ocean ◽  
Trophic Level ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Climate System ◽  
Lower Trophic Level ◽  
The North ◽  
Decadal Scale ◽  
The North Pacific ◽  
Scale Variation

scholarly journals Quantifying the influence of CO<sub>2</sub> seasonality on future ocean acidification

2015 ◽  
Vol 12 (8) ◽  
pp. 5907-5940
Author(s):  
T. P. Sasse ◽  
B. I. McNeil ◽  
R. J. Matear ◽  
A. Lenton
Keyword(s):  
Ocean Acidification ◽  
North Pacific ◽  
Dissolved Inorganic Carbon ◽  
Marine Ecosystem ◽  
Global Ocean ◽  
Saturation State ◽  
The North ◽  
Data Limitations ◽  
The Future ◽  
The North Pacific

Abstract. Ocean acidification is a predictable consequence of rising atmospheric carbon dioxide (CO2), and is highly likely to impact the entire marine ecosystem – from plankton at the base to fish at the top. Factors which are expected to be impacted include reproductive health, organism growth and species composition and distribution. Predicting when critical threshold values will be reached is crucial for projecting the future health of marine ecosystems and for marine resources planning and management. The impacts of ocean acidification will be first felt at the seasonal scale, however our understanding how seasonal variability will influence rates of future ocean acidification remains poorly constrained due to current model and data limitations. To address this issue, we first quantified the seasonal cycle of aragonite saturation state utilizing new data-based estimates of global ocean surface dissolved inorganic carbon and alkalinity. This seasonality was then combined with earth system model projections under different emissions scenarios (RCPs 2.6, 4.5 and 8.5) to provide new insights into future aragonite under-saturation onset. Under a high emissions scenario (RCP 8.5), our results suggest accounting for seasonality will bring forward the initial onset of month-long under-saturation by 17 years compared to annual-mean estimates, with differences extending up to 35 ± 17 years in the North Pacific due to strong regional seasonality. Our results also show large-scale under-saturation once atmospheric CO2 reaches 486 ppm in the North Pacific and 511 ppm in the Southern Ocean independent of emission scenario. Our results suggest that accounting for seasonality is critical to projecting the future impacts of ocean acidification on the marine environment.

A Global Eddy-Resolving Coupled Physical-Biological Model: Physical Influences on a Marine Ecosystem in the North Pacific

SIMULATION ◽  
2006 ◽  
Vol 82 (7) ◽  
pp. 467-474 ◽  
Author(s):  
Yoshikazu Sasai ◽  
Akio Ishida ◽  
Hideharu Sasaki ◽  
Shintaro Kawahara ◽  
Hitoshi Uehara ◽  
...  
Keyword(s):  
North Pacific ◽  
Marine Ecosystem ◽  
Biological Model ◽  
The North ◽  
The North Pacific

Trophic relationships of albatrosses associated with squid and large-mesh drift-net fisheries in the North Pacific Ocean

1997 ◽  
Vol 75 (4) ◽  
pp. 549-562 ◽  
Author(s):  
Patrick Gould ◽  
Peggy Ostrom ◽  
William Walker
Keyword(s):  
Pacific Ocean ◽  
Trophic Level ◽  
North Pacific ◽  
Marine Mammals ◽  
North Pacific Ocean ◽  
Transitional Zone ◽  
Trophic Relationships ◽  
Commercial Fishing ◽  
The North ◽  
The North Pacific

The diets of Laysan (Diomedea immutabilis) and black-footed albatrosses (D. nigripes) killed in squid and large-mesh drift nets in the transitional zone of the North Pacific Ocean were investigated by examining the contents of the digestive tracts and determining δ13C and δ15N values in breast-muscle tissue. The results show that (i) the combined prey of the two species of albatross consists of over 46 species of marine organisms including coelenterates, arthropods, mollusks, fish, and marine mammals; (ii) both species supplement their traditional diets with food made available by commercial fishing operations (e.g., net-caught squid and offal); (iii) while obtained from drift nets, diets of nonbreeding Laysan and black-footed albatrosses are dominated by neon flying squid (Ommastrephes bartrami); (iv) in the absence of drift-net-related food, Laysan albatrosses feed most heavily on fish and black-footed albatrosses feed most heavily on squid; and (v) based on δ15N values, nonbreeding adult Laysan albatrosses from the transitional zone of the North Pacific Ocean and Laysan albatross nestlings fed by adults from Midway Island in the subtropical Pacific feed at one trophic level and one-third of a trophic level lower than black-footed albatrosses, respectively.

scholarly journals PICES’ role in integrating marine ecosystem research in the North Pacific

2005 ◽  
Vol 300 ◽  
pp. 257-259 ◽  
Author(s):  
PA Livingston
Keyword(s):  
North Pacific ◽  
Marine Ecosystem ◽  
Ecosystem Research ◽  
The North ◽  
The North Pacific

scholarly journals Marine Ecosystem Variations Over the North Pacific and Their Linkage to Large-Scale Climate Variability and Change

2020 ◽  
Vol 7 ◽  
Author(s):  
Emi Yati ◽  
Shoshiro Minobe ◽  
Nathan Mantua ◽  
Shin-ichi Ito ◽  
Emanuele Di Lorenzo
Keyword(s):  
Climate Variability ◽  
North Pacific ◽  
Large Scale ◽  
Marine Ecosystem ◽  
Climate Variability And Change ◽  
The North ◽  
The North Pacific

scholarly journals Quantifying the influence of CO<sub>2</sub> seasonality on future aragonite undersaturation onset

2015 ◽  
Vol 12 (20) ◽  
pp. 6017-6031 ◽  
Author(s):  
T. P. Sasse ◽  
B. I. McNeil ◽  
R. J. Matear ◽  
A. Lenton
Keyword(s):  
Ocean Acidification ◽  
North Pacific ◽  
Dissolved Inorganic Carbon ◽  
Marine Ecosystem ◽  
Global Ocean ◽  
Saturation State ◽  
The North ◽  
Data Limitations ◽  
The Future ◽  
The North Pacific

Abstract. Ocean acidification is a predictable consequence of rising atmospheric carbon dioxide (CO2), and is highly likely to impact the entire marine ecosystem – from plankton at the base of the food chain to fish at the top. Factors which are expected to be impacted include reproductive health, organism growth and species composition and distribution. Predicting when critical threshold values will be reached is crucial for projecting the future health of marine ecosystems and for marine resources planning and management. The impacts of ocean acidification will be first felt at the seasonal scale, however our understanding how seasonal variability will influence rates of future ocean acidification remains poorly constrained due to current model and data limitations. To address this issue, we first quantified the seasonal cycle of aragonite saturation state utilizing new data-based estimates of global ocean-surface dissolved inorganic carbon and alkalinity. This seasonality was then combined with earth system model projections under different emissions scenarios (representative concentration pathways; RCPs 2.6, 4.5 and 8.5) to provide new insights into future aragonite undersaturation onset. Under a high emissions scenario (RCP 8.5), our results suggest accounting for seasonality will bring forward the initial onset of month-long undersaturation by 17 ± 10 years compared to annual-mean estimates, with differences extending up to 35 ± 16 years in the North Pacific due to strong regional seasonality. This earlier onset will result in large-scale undersaturation once atmospheric CO2 reaches 496 ppm in the North Pacific and 511 ppm in the Southern Ocean, independent of emission scenario. This work suggests accounting for seasonality is critical to projecting the future impacts of ocean acidification on the marine environment.

scholarly journals Water mass characteristics in the Makassar Strait and Flores Sea in August-September 2015

2021 ◽  
Vol 944 (1) ◽  
pp. 012054
Author(s):  
L L Silaban ◽  
A S Atmadipoera ◽  
M T Hartanto ◽  
Herlisman
Keyword(s):  
North Pacific ◽  
Thermohaline Circulation ◽  
Water Mass ◽  
Regional Climate ◽  
Marine Ecosystem ◽  
Northern Region ◽  
Circulation System ◽  
The North ◽  
Distribution Parameters ◽  
The North Pacific

Abstract Makassar Strait is one of the main entrance points for Indonesian Throughflow (ITF), which carries water from the North Pacific through Flores Sea. ITF has a crucial role as a branch of the thermohaline circulation system in controlling the Indonesian marine ecosystem as well as regional climate variability. This research aims to describe the structure and stratification of water mass and the distribution parameters of chemical physics in the area of Makassar Strait up to Flores Sea at the month of August-September 2015 as much as 8 casts of data CTD is obtained from the result of expedition STOKAS BRKP-KKP using research vessel Baruna Jaya VIII. Research results indicate that the origin of the water mass from the North Pacific is still dominant in the thermocline layer (NPSW) also in the intermediate (NPIW). On average the depth of mixed water layers 60m (± 12.59) with temperature variation between 25.62 – 27.65 C, the average depth of thermocline 130m (±43.65) with temperatures between 18.29 °C – 21.88 °C. Temperature, pH, and dissolved oxygen distribution tends to be higher in the northern region. Fluorescence distribution in the south is higher than the northern region due to inputs from the Makassar upwelling.

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