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North Pacific Gyre

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drastic shrinkage from the surface to about 200 m below. At the surface, the boundary that separates the westward and eastward flows from south of 20⁰N to about 25–30⁰N at 200 m. The "C-shape" in the western region of the Subtropical Gyre, including the Subtropical Countercurrent, generally does not exist below 200 m. At about 1000–1500 m, the Subtropical Gyre is located entirely in the western region of the North Pacific near the Kuroshio Current and Kuroshio Extension. In the subtropical regions, flow is weak where influences from the Subtropical Gyre are minimal. Differences in steric heights over distances of 1000  km are on the order of 1  cm, rather than the differences of 10  cm within the area of the North Pacific Subtropical Gyre.
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Subpolar Gyre from the Subtropical Gyre. In the central and eastern Pacific at roughly 32⁰N is the Subtropical Frontal Zone. Sometimes referred to as the Subtropical Convergence Zone, this frontal zone serves as the boundary between the west flowing North Equatorial Current from the North Pacific Current. With increasing depth in the North Pacific Subtropical Gyre, it gets smaller in the western region near Japan and it also loses strength. The Subtropical Gyre does not exist below 1500 m below the surface with the exception of the Kuroshio Current and Extension regions.
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same 2018 study found that, while microplastics dominate the area by count, 92% of the mass of the patch consists of larger objects which have not yet fragmented into microplastics. Some of the plastic in the patch is over 50 years old, and includes items (and fragments of items) such as "plastic lighters, toothbrushes, water bottles, pens, baby bottles, cell phones, plastic bags, and
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at roughly 20–25⁰N, then finally the "C" wraps back towards the west forming the North Equatorial Current just south of 20⁰N. It is common for subtropical gyres to have this "C-shape" surface flow. The Subtropical Countercurrent is a shallow area of this "C"; at only about 250 dbar under the surface,
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project claimed that the patch covers 1.6 million square kilometres (620,000 square miles) consisting of 45,000–129,000 metric tons (50,000–142,000 short tons) of plastic as of 2018. Its goal is to remove half of the plastic pollution by 2027 using floating barriers anchored to the seabed. The
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is the narrow, strong westward boundary current of the subtropical circulation. This current influences the water column all the way to the bottom. The Kuroshio current flows in a northerly direction, then eventually flows further from the westward boundary where it then takes an eastward direction
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The North Pacific Subtropical Gyre diminishes spatially with increasing depth. Similar to all subtropical gyre systems, the North Pacific Subtropical Gyre shrinks towards its most energetic surface flows, in a northwestern direction between the Kuroshio Current and the Kuroshio Extension. This is
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Narrow east-west frontal zones that cross the Pacific are less than 100  km wide. The Subarctic Frontal Zone or Subarctic Boundary, about 42⁰N, is fixed in the North Pacific Current. The Subarctic Frontal Zone, slightly south of the maximum westerly wind speeds, separates the North Pacific
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In the western region of the North Pacific, the surface of the Subtropical Gyre generally has a "C-shape". The Kuroshio current and Kuroshio Extension roughly from the outside of this "C-shape" where it then turns westwards into recirculation, where it then flows south parallel to the Kuroshio
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is located just north of the Subtropical Gyre and flows in an easterly direction. Also, known as the West Wind Drift or the Subarctic Current, the North Pacific Current also includes the westward flow of the southern boundary of the North Pacific Subpolar Gyre. The
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in the North Pacific and the fact that it is mostly blocked by land in the north, also help facilitate this circulation. As depth increases, these gyres in the North Pacific grow smaller and weaker, and the
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Research indicates that the patch is rapidly accumulating. The patch is believed to have increased "10-fold each decade" since 1945. The gyre contains approximately six pounds of plastic for every pound of
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Despite the common public perception of the patch existing as giant islands of floating garbage, its low density (4 particles per cubic metre (3.1/cu yd)) prevents detection by
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make up the two major gyre systems in the mid-latitudes of the Northern Pacific Ocean. This two-gyre circulation in the North Pacific is driven by the
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this means its circulation is in a clockwise direction around its high pressure at the center. This circulation is also associated with equatorward
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See the relevant sections below for specific references concerning the discovery and history of the patch. A general overview is provided in
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Lebreton, Laurent; Royer, Sarah-Jeanne; Peytavin, Axel; Strietman, Wouter Jan; Smeding-Zuurendonk, Ingeborg; Egger, Matthias (2022-09-01).
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borders the North Pacific Subtropical Gyre on the south and flows in a westerly direction. The westward flow within the elongated tropical
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Lebreton, L.; Slat, B.; Ferrari, F.; Sainte-Rose, B.; Aitken, J.; Marthouse, R.; Hajbane, S.; Cunsolo, S.; Schwarz, A. (22 March 2018).
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Dautel, Susan L. (2007). "Transoceanic Trash: International and United States Strategies for the Great Pacific Garbage Patch".
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Reid, J. L. (1997). "On the Total Geostrophic Circulation of the Pacific Ocean: Flow Patterns, Tracers, and Transports".
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comprises the eastern boundary of the North Pacific Subtropical Gyre and flows south along the coast of California. Here
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applied Ekman transport while including pressure gradient forces to develop a theory for Sverdrup transport.
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Karl, David M. (1999). "A Sea of Change: Biogeochemical Variability in the North Pacific Subtropical Gyre".
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Significant ocean currents involved in the circulation of the North Pacific Subtropical and Subpolar gyres
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Hasunuma, K.; Yoshida, K. (1978). "Splitting of the subtropical gyre in the western North Pacific".
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into the North Pacific. This eastward flowing current is then called the Kuroshio Extension. The
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Evans-Pughe, Christine (February 2017). "Can we engineer our way towards cleaner oceans?".
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Frias, J.; Nash, Roisin (2019). "Microplastics: Finding a consensus on the definition".
673: This article incorporates text from this source, which is available under the 628: 587: 541: 504: 375: 298:. A similar patch of floating plastic debris is found in the Atlantic Ocean, called the 1698: 1581: 1431: 1385: 1380: 917: 904: 863: 852: 653: 615: 610: 553: 395: 387: 212: 166: 104: 64: 595: 1561: 1471: 1304: 1279: 1234: 1229: 1173: 957: 909: 891: 844: 836: 772: 743: 658: 640: 557: 452: 427: 283: 268: 856: 832: 399: 1632: 1481: 1476: 1461: 1441: 1436: 1426: 1309: 1274: 1269: 1249: 1214: 1199: 921: 899: 883: 828: 648: 632: 591: 545: 508: 379: 322: 224:
The patch is created in the gyre of the North Pacific Subtropical Convergence Zone.
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Talley, Lynne D.; Pickard, George L.; Emery, William J.; Swift, James H. (2011).
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to the west. It is the site of an unusually intense collection of human-created
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drives the eastern boundary current and an undercurrent that flows poleward.
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Like all subtropical gyre systems, the North Pacific Subtropical Gyre is an
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particles, in the central North Pacific Ocean. It is located roughly from
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at the center of the Subtropical Gyre will migrate poleward and westward.
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Current. From here the "C-shape" then flows eastward comprising the
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circulation is also included in the North Equatorial current. The
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Ecosystems and Human Health: Toxicology and Environmental Hazards
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Interactions of Land, Ocean and Humans: A Global Perspective
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10.1175/1520-0485(1975)005<0450:fotdti>2.0.co;2
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The Oceans: Their Physics, Chemistry, and General Biology
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The North Pacific Subtropical Gyre and the much smaller
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circulation is a simpler closed, anticyclonic gyre.
424:Descriptive Physical Oceanography: An Introduction 216:Great Pacific garbage patch in August 2015 (model) 189: 472:Sverdrup, H. U.; Johnson; Fleming, R. H. (1942). 1721: 691:Golden Gate University Environmental Law Journal 527: 313:Ecosystem of the North Pacific Subtropical Gyre 1121: 1135: 762: 116:Subtropical circulation in the North Pacific 934: 1128: 1114: 1005:"Huge Garbage Patch Found in Atlantic Too" 16:Major circulating system of ocean currents 903: 804: 652: 512: 476:. New York: Prentice-Hall. pp. M. W. 1040:"Plastic rubbish blights Atlantic Ocean" 742:(3rd ed.). CRC Press. p. 116. 219: 211: 110: 43:. This gyre covers most of the northern 18: 1068: 1722: 1002: 984:from the original on 12 September 2015 688: 1109: 951: 763:Albeck-Ripka, Livia (22 March 2018). 737: 719:from the original on 15 February 2020 486: 1037: 783:from the original on 11 January 2020 573: 569: 567: 417: 415: 413: 411: 409: 361: 1046:from the original on 27 August 2017 1038:Gill, Victoria (24 February 2010). 1003:Lovett, Richard A. (2 March 2010). 449:Introductory Dynamical Oceanography 13: 1062: 14: 1746: 1087: 564: 447:Pond, S.; Pickard, G. L. (1983). 406: 1703: 1692: 668: 493:Journal of Physical Oceanography 204:This section is an excerpt from 198: 35:(NPSG), located in the northern 1031: 996: 970: 928: 833:10.1016/j.marpolbul.2018.11.022 756: 701: 190:Circulation dependence on depth 956:. CRC Press. pp. 147–48. 681: 521: 480: 465: 440: 355: 33:North Pacific Subtropical Gyre 1: 596:10.1016/s0079-6611(97)00012-8 348: 980:. 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(1975). 451:. Pergamon Press. 343:AndrĂ©s de Urdaneta 226: 218: 65:California Current 63:to the north, the 29:North Pacific Gyre 25: 1717: 1716: 1710:Oceans portal 1616: 1615: 1562:Indian Ocean Gyre 1541: 1540: 284:The Ocean Cleanup 282:Researchers from 269:satellite imagery 171:coastal upwelling 134:Ekman downwelling 67:to the east, the 1742: 1708: 1707: 1697: 1696: 1633:Boundary current 1552: 1551: 1507:South Equatorial 1492:North Korea Cold 1487:North Equatorial 1401:South Equatorial 1391:North Madagascar 1330:West Spitsbergen 1320:South Equatorial 1300:North Equatorial 1154: 1153: 1130: 1123: 1116: 1107: 1106: 1083: 1056: 1055: 1053: 1051: 1035: 1029: 1028: 1026: 1024: 1015:. 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Index


Pacific Ocean
oceanic gyres
Pacific Ocean
equator
50° N latitude
ocean currents
North Pacific Current
California Current
North Equatorial Current
Kuroshio Current
marine debris
Great Pacific Garbage Patch
North Pacific Subpolar Gyre
trade
westerly winds
thermohaline circulation
high pressure
anticyclone
Northern Hemisphere
Sverdrup
Ekman downwelling
geostrophic flow
Harald Sverdrup
Kuroshio Current
North Pacific Current
North Equatorial Current
cyclonic
California Current System
coastal upwelling

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