Application of the adjoint technique to processing of a standard section data set: World Ocean Circulation Experiment section S4 along 67°S in the Pacific Ocean

1995 ◽  
Vol 100 (C1) ◽  
pp. 865 ◽  
Author(s):  
D. A. Nechaev ◽  
M. I. Yaremchuk
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
World Ocean ◽  
Data Set ◽  
Section Data ◽  
The Pacific ◽  
World Ocean Circulation Experiment ◽  
The Pacific Ocean ◽  
Standard Section

scholarly journals Woce Radiocarbon IV: Pacific Ocean Results; P10, P13N, P14C, P18, P19 & S4P

Radiocarbon ◽  
2002 ◽  
Vol 44 (1) ◽  
pp. 239-392 ◽  
Author(s):  
Robert M Key ◽  
Paul D Quay ◽  
Peter Schlosser ◽  
A P McNichol ◽  
KF von Reden ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
Large Scale ◽  
World Ocean ◽  
Mass Spectrometry Analysis ◽  
Data Set ◽  
Spectrometry Analysis ◽  
The Pacific ◽  
World Ocean Circulation Experiment ◽  
The Pacific Ocean

The World Ocean Circulation Experiment, carried out between 1990 and 1997, provided the most comprehensive oceanic survey of radiocarbon to date. Approximately 10,000 samples were collected in the Pacific Ocean by U.S. investigators for both conventional large volume p counting and small volume accelerator mass spectrometry analysis techniques. Results from six cruises are presented. The data quality is as good or better than previous large-scale surveys. The 14C distribution for the entire WOCE Pacific data set is graphically described using mean vertical profiles and sections, and property-property plots.

scholarly journals WOCE AMS Radiocarbon I: Pacific Ocean Results (P6, P16 and P17)

Radiocarbon ◽  
1996 ◽  
Vol 38 (3) ◽  
pp. 425-518 ◽  
Author(s):  
Robert M. Key ◽  
Paul D. Quay ◽  
Glenn A. Jones ◽  
A. P. McNichol ◽  
K. F. Von Reden ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
World Ocean ◽  
Depth Range ◽  
Near Surface ◽  
The North ◽  
The Pacific ◽  
World Ocean Circulation Experiment ◽  
The Pacific Ocean ◽  
Similar Density

AMS radiocarbon results from the World Ocean Circulation Experiment in the Pacific Ocean show dramatic changes in the inventory and distribution of bomb-produced 14C since the time of the GEOSECS survey (8/73–6/74). Near-surface Δ14C values for the eastern portion of both the northern and southern subtropical gyres decreased by 25–50‰, with the change being greater in the north. Equatorial near-surface values have increased by ca. 25‰. Changes in the 250–750-m depth range are dramatically different between the northern and southern basins. The intermediate and mode waters of the southern basin have increased by as much as 75‰ since GEOSECS. Waters of similar density in the northern hemisphere are not exposed to the Southern Ocean circulation regime and are significantly less ventilated, showing maximum changes of ca. 50‰.

scholarly journals Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1641-1650 ◽  
Author(s):  
Yuichiro Kumamoto ◽  
Akihiko Murata ◽  
Takeshi Kawano ◽  
Shuichi Watanabe ◽  
Masao Fukasawa
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
Dissolved Inorganic Carbon ◽  
World Ocean ◽  
Temporal Changes ◽  
Turnover Time ◽  
Subtropical Region ◽  
The North ◽  
The Pacific ◽  
The Pacific Ocean

In the 2000s, radiocarbon in dissolved inorganic carbon was measured during 7 revisit cruises along the lines of the World Ocean Circulation Experiment in the Pacific Ocean. Comparison of 14C data along these lines from the 1990s and 2000s revealed decadal changes of 14C concentration in the thermocline, most of which were due to temporal changes in the bomb-produced 14C. Vertical profiles and vertical-integrated inventories of the bomb 14C in the subarctic and equatorial regions did not change appreciably. In the southern subtropical region, 14C decreased in the upper thermocline from the surface to ∼500 m depth. In contrast, 14C increased in the lower thermocline below ∼500 m depth. The opposing directions in 14C change resulted in small temporal changes in the total inventory of bomb 14C. On the other hand, the water-column inventory significantly decreased in the northwestern subtropical region due to the 14C decrease in the upper thermocline. These decadal changes in bomb 14C indicate that the turnover time of thermocline circulation in the northwestern subtropical region is faster than that in the southern subtropical region, and imply an interbasin transport of bomb 14C from the North Pacific to other basins.

scholarly journals The political biogeography of migratory marine predators

2019 ◽  
Author(s):  
Autumn-Lynn Harrison
Keyword(s):  
Pacific Ocean ◽  
The Political ◽  
Migratory Species ◽  
Data Set ◽  
Leatherback Turtles ◽  
Annual Cycles ◽  
Marine Predators ◽  
The Pacific ◽  
The Pacific Ocean ◽  
International Strategies

We synthesized a large tracking data set from the Tagging of Pacific Predators to show how the movements and migratory phenology of 1,648 individuals representing 14 species—from leatherback turtles to white sharks—relate to the geopolitical boundaries of the Pacific Ocean throughout species’ annual cycles. Cumulatively, these species visited 86% of Pacific Ocean countries and some spent three-quarters of their annual cycles in the high seas. With our results, we offer answers to questions posed when designing international strategies for managing migratory species.

scholarly journals Large-Volume WOCE Radiocarbon Sampling in the Pacific Ocean

Radiocarbon ◽  
1996 ◽  
Vol 38 (3) ◽  
pp. 519-561 ◽  
Author(s):  
Minze Stuiver ◽  
H. G. Östlund ◽  
Robert M. Key ◽  
Paula J. Reimer
Keyword(s):  
Pacific Ocean ◽  
Large Volume ◽  
University Of Washington ◽  
Data Set ◽  
Comprehensive Data ◽  
The Pacific ◽  
The Pacific Ocean ◽  
University Of Miami ◽  
The University

At the University of Miami Tritium Laboratory and the University of Washington Quaternary Isotope Laboratory, more than 1000 large-volume Pacific Ocean radiocarbon samples were measured for the WOCE program. Here we present a comprehensive data set, and a brief discussion of our findings.

scholarly journals Biogeochemistry of the North Atlantic during oceanic anoxic event 2: role of changes in ocean circulation and phosphorus input

2014 ◽  
Vol 11 (4) ◽  
pp. 977-993 ◽  
Author(s):  
I. Ruvalcaba Baroni ◽  
R. P. M. Topper ◽  
N. A. G. M. van Helmond ◽  
H. Brinkhuis ◽  
C. P. Slomp
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
North Atlantic ◽  
Primary Productivity ◽  
Low Oxygen ◽  
Deep Basin ◽  
The North ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The North Atlantic

Abstract. The geological record provides evidence for the periodic occurrence of water column anoxia and formation of organic-rich deposits in the North Atlantic Ocean during the mid-Cretaceous (hereafter called the proto-North Atlantic). Both changes in primary productivity and oceanic circulation likely played a role in the development of the low-oxygen conditions. Several studies suggest that an increased input of phosphorus from land initiated oceanic anoxic events (OAEs). Other proposed mechanisms invoke a vigorous upwelling system and an ocean circulation pattern that acted as a trap for nutrients from the Pacific Ocean. Here, we use a detailed biogeochemical box model for the proto-North Atlantic to analyse under what conditions anoxia could have developed during OAE2 (94 Ma). The model explicitly describes the coupled water, carbon, oxygen and phosphorus cycles for the deep basin and continental shelves. In our simulations, we assume the vigorous water circulation from a recent regional ocean model study. Our model results for pre-OAE2 and OAE2 conditions are compared to sediment records of organic carbon and proxies for photic zone euxinia and bottom water redox conditions (e.g. isorenieratane, carbon/phosphorus ratios). Our results show that a strongly elevated input of phosphorus from rivers and the Pacific Ocean relative to pre-OAE2 conditions is a requirement for the widespread development of low oxygen in the proto-North Atlantic during OAE2. Moreover, anoxia in the proto-North Atlantic is shown to be greatly influenced by the oxygen concentration of Pacific bottom waters. In our model, primary productivity increased significantly upon the transition from pre-OAE2 to OAE2 conditions. Our model captures the regional trends in anoxia as deduced from observations, with euxinia spreading to the northern and eastern shelves but with the most intense euxinia occurring along the southern coast. However, anoxia in the central deep basin is difficult to achieve in the model. This suggests that the ocean circulation used in the model may be too vigorous and/or that anoxia in the proto-North Atlantic was less widespread than previously thought.

scholarly journals Can seafloor voltage cables be used to study large-scale circulation? An investigation in the Pacific Ocean

Ocean Science ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 383-392
Author(s):  
Jakub Velímský ◽  
Neesha R. Schnepf ◽  
Manoj C. Nair ◽  
Natalie P. Thomas
Keyword(s):  
Pacific Ocean ◽  
Flow Velocity ◽  
Ocean Circulation ◽  
Large Scale ◽  
Eastern Pacific ◽  
Low Flow ◽  
Large Scale Circulation ◽  
Numerical Predictions ◽  
The Pacific ◽  
The Pacific Ocean

Abstract. Marine electromagnetic (EM) signals largely depend on three factors: flow velocity, Earth's main magnetic field, and seawater's electrical conductivity (which depends on the local temperature and salinity). Because of this, there has been recent interest in using marine EM signals to monitor and study ocean circulation. Our study utilizes voltage data from retired seafloor telecommunication cables in the Pacific Ocean to examine whether such cables could be used to monitor circulation velocity or transport on large oceanic scales. We process the cable data to isolate the seasonal and monthly variations and then evaluate the correlation between the processed data and numerical predictions of the electric field induced by an estimate of ocean circulation. We find that the correlation between cable voltage data and numerical predictions strongly depends on both the strength and coherence of the model velocities flowing across the cable, the local EM environment, as well as the length of the cable. The cable within the Kuroshio Current had good correlation between data and predictions, whereas two of the cables in the Eastern Pacific Gyre – a region with both low flow speeds and interfering velocity directions across the cable – did not have any clear correlation between data and predictions. Meanwhile, a third cable also located in the Eastern Pacific Gyre showed good correlation between data and predictions – although the cable is very long and the speeds were low, it was located in a region of coherent flow velocity across the cable. While much improvement is needed before utilizing seafloor voltage cables to study and monitor oceanic circulation across wide regions, we believe that with additional work, the answer to the question of whether or not seafloor voltage cables can be used to study large-scale circulation may eventually be yes.

scholarly journals CONTINENTAL FRAMING AND OUTDOOR SEAS THE PACIFIC OCEAN AS A PLANETARY LANDSCAPE GEOSYSTEM IN THE DEVELOPMENT OF THE WORLD OCEAN

2021 ◽  
Author(s):  
В.Т. Старожилов
Keyword(s):  
Pacific Ocean ◽  
Landscape Structure ◽  
World Ocean ◽  
Marginal Seas ◽  
Basic Model ◽  
The Pacific ◽  
The World ◽  
Model Foundation ◽  
Practical Development ◽  
The Pacific Ocean

Констатируется, что континентальное обрамление и окраинные моря Тихого океана как планетарная ландшафтная геосистема в освоении Мирового океана и выделенные как Тихоокеанский ландшафтный пояс (https://doi.org/10.18411/a-2017-089) как основа - модель научного и практического освоения геосистемы океан- континент ранее не рассматривалась. В настоящее время в связи с освоением переходной зоны Азиатского континента к океану появилась необходимость рассмотреть возможности применения ландшафтного подхода в практиках освоения геосистем этой зоны. Работа, представляет собой продолжение комплексных исследований в целом сформировавшейся ландшафтной школы профессора В.Т. Старожилова (doi:10.24411/1728-323Х-2020-13079, doi:10.18411/lj-05-2020-26). Отмечается, что комплексное изучение ландшафтной структуры обрамления Тихого океана, имеет базовое значение при природопользовании Мирового океана. Именно ландшафтный пояс, включающий Сихотэ-Алинскую, Нижнеамурскую, Камчатско-Курильскую, Сахалинскую и другие ландшафтные области и сопряженные с ними окраинные моря, представляет собой часть единой с Тихим океаном структуры природы и представляются как основа для выполнения задач науки и практики освоения территорий континентального обрамления Тихого океана, окраинных морей и использования материалов в освоении Мирового океана. Он, как планетарная ландшафтная структура, является базовой моделью «фундаментом» для построения гармонизированных с природой и связанных с океаном экологических, сельскохозяйственных и других отраслевых моделей освоения этой обширной тихоокеанской зоны. Отмечается, что в свою очередь применение компьютерной технологии векторно-слоевого ландшафтного метода создают платформу для разработки планов и проектов освоения. Он также является платформой для обучения студентов. Приводятся данные о картографической обеспеченности пояса современными векторно-слоевыми цифровыми материалами. It is stated that the continental framing and marginal seas of the Pacific Ocean as a planetary landscape geosystem in the development of the World Ocean and identified as the Pacific landscape belt (https://doi.org/10.18411/a-2017-089) as a basis - a model of scientific and practical development of the geosystem ocean-continent has not been previously considered. Currently, in connection with the development of the transition zone of the Asian continent to the ocean, it is necessary to consider the possibilities of applying the landscape approach in the practice of developing the geosystems of this zone. The work is a continuation of the comprehensive studies of the generally formed landscape school of Professor V.T. Starozhilov (doi: 10.24411 / 1728-323X-2020-13079, doi: 10.18411 / lj-05-2020-26). It is noted that a comprehensive study of the landscape structure of the Pacific Ocean framing is of fundamental importance in the use of natural resources in the World Ocean. It is the landscape belt, including the Sikhote-Alin, Nizhneamur, Kamchatka-Kuril, Sakhalin and other landscape areas and the marginal seas associated with them, that is a part of the structure of nature united with the Pacific Ocean and is presented as the basis for fulfilling the tasks of science and practice of developing territories of the continental framing The Pacific Ocean, marginal seas and the use of materials in the development of the World Ocean. It, as a planetary landscape structure, is the basic model "foundation" for building harmonized with nature and related to the ocean ecological, agricultural and other sectoral models for the development of this vast Pacific zone. It is noted that, in turn, the use of computer technology of the vector-layer landscape method creates a platform for the development of plans and development projects. It is also a platform for student learning. The data on the cartographic provision of the belt with modern vector-layer digital materials are presented.

scholarly journals Континентальное обрамление и окраинные моря Тихого океана как планетарная ландшафтная геосистема в освоении мирового океана

2021 ◽  
Vol 70 (2) ◽  
pp. 138-144
Author(s):  
В.Т. Старожилов
Keyword(s):  
Pacific Ocean ◽  
Landscape Structure ◽  
World Ocean ◽  
Marginal Seas ◽  
Basic Model ◽  
The Pacific ◽  
The World ◽  
Model Foundation ◽  
Practical Development ◽  
The Pacific Ocean

It is stated that the continental framing and marginal seas of the Pacific Ocean as a planetary landscape geosystem in the development of the World Ocean and identified as the Pacific landscape belt (https://doi.org/10.18411/a-2017-089) as a basis - a model of scientific and practical development of the geosystem ocean-continent has not been previously considered. Currently, in connection with the development of the transition zone of the Asian continent to the ocean, it is necessary to consider the possibilities of applying the landscape approach in the practice of developing the geosystems of this zone. The work is a continuation of the comprehensive studies of the generally formed landscape school of Professor V.T. Starozhilov (doi: 10.24411 / 1728-323X-2020-13079, doi: 10.18411 / lj-05-2020-26). It is noted that a comprehensive study of the landscape structure of the Pacific Ocean framing is of fundamental importance in the use of natural resources in the World Ocean. It is the landscape belt, including the Sikhote-Alin, Nizhneamur, Kamchatka-Kuril, Sakhalin and other landscape areas and the marginal seas associated with them, that is a part of the structure of nature united with the Pacific Ocean and is presented as the basis for fulfilling the tasks of science and practice of developing territories of the continental framing The Pacific Ocean, marginal seas and the use of materials in the development of the World Ocean. It, as a planetary landscape structure, is the basic model "foundation" for building harmonized with nature and related to the ocean ecological, agricultural and other sectoral models for the development of this vast Pacific zone. It is noted that, in turn, the use of computer technology of the vector-layer landscape method creates a platform for the development of plans and development projects. It is also a platform for student learning. The data on the cartographic provision of the belt with modern vector-layer digital materials are presented.

Sign in / Sign up

Export Citation Format

Share Document