Prediction of ocean surface current velocity and application to meteorological navigation in the North Pacific

1990 ◽  
Vol 8 (1) ◽  
pp. 1-25
Author(s):  
Jing Zhenhua ◽  
Shi Maochong ◽  
Shen Jijun
Keyword(s):  
Current Velocity ◽  
North Pacific ◽  
Surface Current ◽  
Ocean Surface ◽  
The North ◽  
Ocean Surface Current ◽  
The North Pacific

Evidence of a Westward-Flowing "Subarctic Countercurrent" in the North Pacific Ocean

1976 ◽  
Vol 33 (10) ◽  
pp. 2168-2196 ◽  
Author(s):  
S. Tabata
Keyword(s):  
Current Velocity ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Surface Current ◽  
Pacific Region ◽  
Velocity Data ◽  
Vorticity Field ◽  
The North ◽  
Océanographic Survey ◽  
The North Pacific

An examination of surface current velocity data obtained from two independent ship sources suggests the presence of a narrow, weak, westward-flowing countercurrent at a latitude of approximately 50°N in the subarctic Pacific region. Oceanographic survey data collected in the region from the summers of 1958 and 1959 also indicate such a countercurrent extending zonally for more than 1000 km. The countercurrent can be explained by consideration of the wind-stress vorticity field over the region.

Valdivia, Jomon Fishermen, and the Nature of the North Pacific: Some Nautical Problems with Meggers, Evans, and Estrada's (1965) Transoceanic Contact Thesis

1978 ◽  
Vol 43 (3) ◽  
pp. 362-371 ◽  
Author(s):  
Gordon F. McEwan ◽  
D. Bruce Dickson
Keyword(s):  
North Pacific ◽  
Surface Current ◽  
Weather Conditions ◽  
The North ◽  
Alternative Routes ◽  
The North Pacific

Meggers, Evans, and Estrada's (1965) thesis, that storm-tossed Jomon fishermen drifted across the North Pacific to the coast of Ecuador and introduced pottery-making at the Valdivia site, is presented. The thesis is examined from the standpoint of the mechanics of such a voyage. The nature of the surface current patterns in the North Pacific are discussed, together with the weather conditions found along the presumed route, the types of vessels known archaeologically for the early Jomon, and the suitability of such vessels for a trans-Pacific crossing. Finally, the survival problems faced by a crew adrift in an open boat on the North Pacific are presented. It is concluded that contact between Jomon and Valdivian peoples was unlikely to have occurred in the manner suggested by Meggers, Evans, and Estrada. Several possible alternative routes and explanations are advanced.

scholarly journals Velocity Estimation of Ocean Surface Currents in along-Track InSAR System Based on Conditional Generative Adversarial Networks

2021 ◽  
Vol 13 (20) ◽  
pp. 4088
Author(s):  
He Yan ◽  
Qianru Hou ◽  
Guodong Jin ◽  
Xing Xu ◽  
Gong Zhang ◽  
...  
Keyword(s):  
Current Velocity ◽  
Surface Current ◽  
Ocean Surface ◽  
Velocity Estimation ◽  
Training Dataset ◽  
Generative Adversarial Networks ◽  
Surface Currents ◽  
Ocean Surface Currents ◽  
Ocean Surface Current ◽  
Along Track

Velocity estimation of ocean surface currents is of great significance in the fields of the fishery, shipping, sewage discharge, and military affairs. Over the last decade, along-track interferometric synthetic aperture radar (along-track InSAR) has been demonstrated to be one of the important instruments for large-area and high-resolution ocean surface current velocity estimation. The calculation method of the traditional ocean surface current velocity, as influenced by the large-scale wave orbital velocity and the Bragg wave phase velocity, cannot easily separate the current velocity, characterized by large error and low efficiency. In this paper, a novel velocity estimation method of ocean surface currents is proposed based on Conditional Generative Adversarial Networks (CGANs). The main processing steps are as follows: firstly, the known ocean surface current field diagrams and their corresponding interferometric phase diagrams are constructed as the training dataset; secondly, the estimation model of the ocean surface current field is constructed based on the pix2pix algorithm and trained by the training dataset; finally, the interferometric phase diagrams in the test dataset are input into the trained model. In the simulation experiment, processing results of the proposed method are compared with those of traditional ocean surface current velocity estimation methods, which demonstrate the efficiency and effectiveness of the novel method.

The Value of Ocean Surface Wind Information for Maritime Commerce

2011 ◽  
Vol 45 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Hauke Kite-Powell
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Surface Wind ◽  
Ocean Surface ◽  
Maritime Transportation ◽  
Wave Condition ◽  
The North ◽  
Ocean Surface Wind ◽  
The North Atlantic ◽  
The North Pacific

AbstractObservations, nowcasts, and forecasts of ocean surface wind conditions are of economic value to activities such as maritime transportation, commercial fishing, offshore energy, recreational boating, and search and rescue. In this paper, we estimate the value to the maritime shipping industry of ocean surface wind information and of wind and wave condition forecasts based on this information. Commercial ships transiting the North Pacific and North Atlantic oceans are exposed to severe wind and wave conditions associated with extratropical storms. These storms impose costs on maritime commerce by delaying and sometimes damaging vessels or causing loss of cargo. Ocean surface wind information allows ships to limit their exposure to these conditions. We estimate that average expected annual losses to container shipping (lost containers and associated damage to vessels) in the absence of good information about extratropical storm conditions would be on the order of $250 million/year in the North Pacific and $120 million/year in the North Atlantic, and we estimate average expected annual losses to bulk shipping operations from extratropical storm exposure in these regions to be on the order of $150 million/year. A significant fraction of this risk can be avoided with ocean surface vector wind observations and forecasts. Our model results suggest that the QuikSCAT information (available until November 2009) and associated forecasts enabled a reduction in annual exposure for shipping traffic in the North Atlantic and North Pacific of about 50%, with total annual net savings around $150 million. The estimate of annual benefits to shipping operations from a hypothetical improved satellite instrument is around $200 million.

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