# प्रशान्त महासागर

Pacific Ocean
**प्रशान्त महासागर** हलिमयागु दक्ले तधंगु महासागर खः। थ्व एसिया व अमेरिकायागु दथुइ लाः। थ्व महासागरया नां ल्यातिन भासां *Mare Pacificum* बाय् "शान्त सागर"या नामं वःगु ख। थ्व नां पोर्चुगिज अन्वेषक फर्दिन्यान्द म्यागेलेन)या नामं वःगु ख। थ्व महसागर उत्तरय् आर्क्तिक महासागरं दक्षिणय् एन्तार्क्तिक महासागर तक थ्यं। थुकिया सिथय् एसिया व अस्त्रेलिया पश्चिमय् व अमेरिका पूर्वय् ला। १६९.२ मिलियन वर्ग किमि (६५.३ मिलियन  वर्ग माइल) क्षेत्रफल दूगु थ्व महासागर हलिंया दकलय् चकंगु व तःधंगु महासागर ख। थुकिया दुने पृथ्वीया ४६% लः व ३२% पृथ्वीया सतह दुथ्याः। थुकिया सतह क्षेत्र सकल बँ क्षेत्रस्वया अप्व दु। इक्वेतरं थुकियात उत्तर प्रशान्त महासागर व दक्षिण प्रशान्त महासागरय् ब्वथलातःगु दु। मेरियाना ट्रेञ्च पश्चिमी उत्तर प्रशान्तया दकलय् गाःवंगु थाय् ख व थ्व हलिंया दकलय् गाःवंगु थाय् नं ख। थुकिया गाः १०,९११ मि (३५,७९८ फित) दु

## स्वापू दूगु समुद्र

|  |  |  |  |
| --- | --- | --- | --- |
| * अराफुरा सागर
* बांडा सागर
* बेरिङ्ग सागर
* बिस्मार्क सागर
* बोहाई सागर
* बोहोल सागर (मिन्डानाओ सागर नं धाइ)
* कामोट्स समुद्र
* सेलिबेस समुद्र
 | * सेराम समुद्र
* चिलिचा समुद्र
* प्रवाल समुद्र
* पूर्वी चीन सागर
* फ्लोरेस समुद्र
* अलास्काया खाडी
* क्यालिफोर्निया खाडी (कोर्टेसया समुद्रया नामं नं म्हसीकिगु या)
 | * कार्पेन्टेरियाया खाडी
* थाइया खाडी
* हलमहेरा समुद्र
* जावा समुद्र
* कोरो सागर
* मोलक्का सागर
* फिलिपिन्स सागर
* सावु सागर
 | * जापापा समुद्र
* ओखोत्स्कया समुद्र
* सेटो अन्तर्देशीय समुद्र
* सिबुयान सागर
* सोलोमन समुद्र
* दक्षिण चीनी समुद्र
* सुलु सागर
* तसमान समुद्र
* विसायन सागर
* पिवला समुद्र
 |

## म्हसीका

The ocean encompasses a third of the Earth's surface, having an area of 179.7 million square kilometres (69.4 million sq mi and 161 million cubic mi) —significantly larger than Earth's entire landmass, with room for another Africa to spare. Extending approximately 15,500 kilometres (9,600  mi) from the Bering Sea in the Arctic to the icy margins of Antarctica's Ross Sea in the south (although the Antarctic regions of the Pacific are sometimes described as part of the circumpolar Southern Ocean), the Pacific reaches its greatest east-west width at about 5°N latitude, where it stretches approximately 19,800 kilometres (12,300 mi) from Indonesia to the coast of Colombia and Peru - halfway across the world, and more than five times the diameter of the Moon. The western limit of the ocean is often placed at the Strait of Malacca. The lowest point on earth—the Mariana Trench—lies 10,911 metres (35,797 ft) below sea level. Its average depth is 4,280 metres (14,000 ft).

किपा:Palmbeach.JPGThe shoreline at Palm Beach, New South Wales
The Pacific contains about 25,000 islands (more than the total number in the rest of the world's oceans combined), the majority of which are found south of the equator.

The Pacific Ocean is currently shrinking from plate tectonics, while the Atlantic Ocean is increasing in size.

Along the Pacific Ocean's irregular western margins lie many seas, the largest of which are the Celebes Sea, Coral Sea, East China Sea, Philippine Sea, Sea of Japan, South China Sea, Sulu Sea, Tasman Sea, and Yellow Sea. The Strait of Malacca joins the Pacific and the Indian Oceans on the west, and the Strait of Magellan links the Pacific with the Atlantic Ocean on the east. To the north, the Bering Strait connects the Pacific with the Arctic Ocean.

As the Pacific straddles the ± 180° meridian, the *West Pacific* (or *western Pacific*, near Asia) is actually in the Eastern Hemisphere, while the *East Pacific* (or *eastern Pacific*, near the Americas) is actually in the Western Hemisphere.

For most of Magellan's voyage from the Strait of Magellan to the Philippines, the explorer indeed found the ocean peaceful. However, the Pacific is not always peaceful. Many tropical cyclones (typhoons, the equivalent of Atlantic hurricanes), batter the islands of the Pacific. The lands around the Pacific rim are full of volcanoes and often affected by earthquakes. Tsunamis, caused by underwater earthquakes, have devastated many islands and destroyed entire towns.

## लया गुण

Storm in Pacifica, California
Sunset in Monterey County, California, U.S..
Water temperatures in the Pacific vary from freezing in the poleward areas to about 25-30 °C Celsius 84 °F Fahrenheit near the equator. Salinity also varies latitudinally. The water near the equator is less salty than that found in the mid-latitudes because of abundant equatorial precipitation throughout the year. Poleward of the temperate latitudes salinity is also low, because little evaporation of seawater takes place in these frigid areas. The Pacific Ocean is generally warmer than the Atlantic ocean.

The surface circulation of Pacific waters is generally clockwise in the Northern Hemisphere (the North Pacific Gyre) and counter-clockwise in the Southern Hemisphere. The North Equatorial Current, driven westward along latitude 15°N by the trade winds, turns north near the Philippines to become the warm Japan or Kuroshio Current.

Turning eastward at about 45°N, the Kuroshio forks and some waters move northward as the Aleutian Current, while the rest turn southward to rejoin the North Equatorial Current. The Aleutian Current branches as it approaches North America and forms the base of a counter-clockwise circulation in the Bering Sea. Its southern arm becomes the chilled slow, south-flowing California Current.

The South Equatorial Current, flowing west along the equator, swings southward east of New Guinea, turns east at about 50°S, and joins the main westerly circulation of the Southern Pacific, which includes the Earth-circling Antarctic Circumpolar Current. As it approaches the Chilean coast, the South Equatorial Current divides; one branch flows around Cape Horn and the other turns north to form the Peru or Humboldt Current.

## खनिजशास्त्र

Sunset over the Pacific Ocean as seen from the International Space Station. Anvil tops of thunderclouds are also visible.
The andesite line is the most significant regional distinction in the Pacific. It separates the deeper, mafic igneous rock of the Central Pacific Basin from the partially submerged continental areas of felsic igneous rock on its margins. The andesite line follows the western edge of the islands off California and passes south of the Aleutian arc, along the eastern edge of the Kamchatka Peninsula, the Kuril Islands, Japan, the Mariana Islands, the Solomon Islands, and New Zealand. The dissimilarity continues northeastward along the western edge of the Andes Cordillera along South America to Mexico, returning then to the islands off California. Indonesia, the Philippines, Japan, New Guinea, and New Zealand—all eastward extensions of the continental blocks of Australia and Asia—lie outside the Andesite Line.

Within the closed loop of the andesite line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Pacific basin. Here basaltic lavas gently flow out of rifts to build huge dome-shaped volcanic mountains whose eroded summits form island arcs, chains, and clusters. Outside the Andesite Line, volcanism is of the explosive type, and the Pacific Ring of Fire is the world's foremost belt of explosive volcanism. The Ring of Fire is named after the several hundred active volcanoes that sit above the various subduction zones.

The Pacific Ocean is the only ocean which is almost totally bounded by subduction zones. Only the boundary with the Antarctic plate is not a subduction zone.

## Landmasses

The Pacific is ringed by many volcanoes and oceanic trenches
The largest landmass entirely within the Pacific Ocean is the island of New Guinea— the second largest island in the world. Almost all of the smaller islands of the Pacific lie between 30°N and 30°S, extending from Southeast Asia to Easter Island; the rest of the Pacific Basin is almost entirely submerged.

The great triangle of Polynesia, connecting Hawaii, Easter Island, and New Zealand, encompasses the island arcs and clusters of the Cook Islands, Marquesas, Samoa, Society, Tokelau, Tonga, Tuamotu, Tuvalu and the Wallis and Futuna islands.

North of the equator and west of the International Date Line are the numerous small islands of Micronesia, including the Caroline Islands, the Marshall Islands and the Mariana Islands.

In the southwestern corner of the Pacific lie the islands of Melanesia, dominated by New Guinea. Other important island groups of Melanesia include the Bismarck Archipelago, Fiji, New Caledonia, the Solomon Islands and Vanuatu.

Islands in the Pacific Ocean are of four basic types: continental islands, high islands, coral reefs, and uplifted coral platforms. Continental islands lie outside the Andesite Line and include New Guinea, the islands of New Zealand, and the Philippines. These islands are structurally associated with nearby continents. High islands are of volcanic origin, and many contain active volcanoes. Among these are Bougainville, Hawaii, and the Solomon Islands.

The third and fourth types of islands are both the result of coralline island building. Coral reefs are low-lying structures that have built up on basaltic lava flows under the ocean's surface. One of the most dramatic is the Great Barrier Reef off northeastern Australia. A second island type formed of coral is the uplifted coral platform, which is usually slightly larger than the low coral islands. Examples include Banaba (formerly Ocean Island) and Makatea in the Tuamotu group of French Polynesia.

## इतिहास व अर्थतन्त्र

Further information: ओसेनिया
Maris Pacifici by Ortelius (1589). Probably the first printed map that shows the Pacific Ocean.
Bathyscaphe Trieste, before her record dive to the bottom of the Marianas Trench, 23 January 1960.
Important human migrations occurred in the Pacific in prehistoric times, most notably those of the Austronesians (specifically, the Polynesians), from the Asian edge of the ocean to Tahiti and then to Hawaii, New Zealand, and Easter Island.

The ocean was sighted by Europeans early in the 16th century, first by the Spanish explorer Vasco Núñez de Balboa (1513), who crossed the Isthmus of Panama, and then by Ferdinand Magellan, who sailed the Pacific during his circumnavigation (1519-1522). In 1564, conquistadors crossed the ocean from Mexico led by Miguel López de Legazpi who sailed to the Philippines and Mariana Islands. For the remainder of the 16th century, Spanish influence was paramount, with ships sailing from Spain to the Philippines, New Guinea, and the Solomon Islands; the Manila Galleons linked Manila and Acapulco.

During the 17th century, the Dutch, sailing around southern Africa, dominated discovery and trade; Abel Janszoon Tasman discovering Tasmania and New Zealand in 1642. The 18th century marked a burst of exploration by the Russians in Alaska and the Aleutian Islands, the French in Polynesia, and the British in the three voyages of James Cook (to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest).

Growing imperialism during the 19th century resulted in the occupation of much of Oceania by Great Britain and France, followed by the United States. Significant contributions to oceanographic knowledge were made by the voyages of HMS *Beagle* in the 1830s, with Charles Darwin aboard; HMS *Challenger* during the 1870s; the USS *Tuscarora* (1873-76); and the German Gazelle (1874-76). Although the United States conquered the Philippines in 1898, Japan controlled the western Pacific by 1914 and occupied many other islands during World War II. By the end of the war, the U.S. Pacific Fleet was the virtual master of the ocean.

Seventeen independent states are located in the Pacific: Australia, Fiji, Japan, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, the Philippines, Samoa, Solomon Islands, Republic of China (Taiwan), Tonga, Tuvalu, and Vanuatu. Eleven of these nations have achieved full independence since 1960. The Northern Mariana Islands are self-governing with external affairs handled by the United States, and Cook Islands and Niue are in similar relationships with New Zealand. Also within the Pacific is the U.S. state of Hawaii and several island territories and possessions of Australia, Chile, Ecuador, France, Japan, New Zealand, the United Kingdom, and the United States.

The exploitation of the Pacific's mineral wealth is hampered by the ocean's great depths. In shallow waters of the continental shelves off the coasts of Australia and New Zealand, petroleum and natural gas are extracted, and pearls are harvested along the coasts of Australia, Japan, Papua New Guinea, Nicaragua, Panama, and the Philippines, although in sharply declining volume in some cases. The Pacific's greatest asset is its fish. The shoreline waters of the continents and the more temperate islands yield herring, salmon, sardines, snapper, swordfish, and tuna, as well as shellfish.

In 1986, the member nations of the South Pacific Forum declared the area a nuclear-free zone in an effort to halt nuclear testing and prevent the dumping of nuclear waste there.

## Environmental Issues

Marine pollution is a generic term for the harmful entry into the ocean of chemicals or particles. The biggest culprit are rivers that empty into the Ocean, and with it the many chemicals used as fertilizers in agriculture as well as waste from livestock and humans. The excess of oxygen depleting chemicals in the water leads to hypoxia and the creation of a dead zone (ecology).

स्वयादिसँ: North Pacific Gyre
स्वयादिसँ: Ship pollution
## मू बन्दरगाह

|  |  |
| --- | --- |
| * अकापुल्को, मेक्सिको
* एन्कोरेज, अलास्का, संयुक्त राज्य अमेरिका
* एन्टोफागास्ता, चिली
* अरिका, चिली
* अकल्याण्ड, न्युजिल्याण्ड
* बैंकक, थाइल्याण्ड
* बटांगास, फिलिपिन्स
* पोर्टोभिएजो, इक्वेडर
* ब्रिस्बेन, क्वीन्सल्याण्ड, अष्ट्रेलिया
* बुएनाभेन्चुरा, कोलम्बिया
* बुसान, दक्षिण कोरिया
* काबो सान लुकास, मेक्सिको
* कल्लाओ, पेरु
* सेबु शहर, फिलिपिन्स
* चोंगजिन, उत्तर कोरिया
* डालियान, चीन]
* एन्सेनाडा, मेक्सिको
* एसमेराल्डास, इक्वेडर
* ग्वायाकिल, इक्वेडर
* हङकङ, जनवादी गणराज्य चीन
* होनोलुलु, हवाई, संयुक्त राज्य अमेरिका
* इन्चियन, दक्षिण कोरिया
* इक्विक, चिली
* काओसिउङ, गणतन्त्र चीन (ताइवान)
* किटिमत, ब्रिटिश कोलम्बिया, कनाडा
* कीलुङ, गणतन्त्र चीन (ताइवान)
* क्लाङ्ग, मलेशिया
* कोबे, जापान
* लेम चाबाङ, थाइल्याण्ड
* लङ्ग बीच, क्यालिफोर्निया, संयुक्त राज्य अमेरिका
* लस एन्जलस, क्यालिफोर्निया, संयुक्त राज्य अमेरिका
 | * मान्ता, इक्वेडर
* मान्जानिलो, मेक्सिको
* माजाटलान, मेक्सिको
* मेलबर्न, भिक्टोरिया, अष्ट्रेलिया
* मेट्रो मनिला, फिलिपिन्स
* नाम्पो, उत्तर कोरिया
* न्युक्यासल, न्यू साउथ वेल्स, अष्ट्रेलिया
* ओकल्याण्ड, क्यालिफोर्निया, संयुक्त राज्य अमेरिका
* पानामा सिटी, पानामा
* पोर्टल्याण्ड, ओरेगन, संयुक्त राज्य अमेरिका
* राजकुमार रुपर्ट, ब्रिटिश कोलम्बिया, कनाडा
* प्यूर्टो मोन्ट, चिली
* पुएर्टो भल्लार्टा, मेक्सिको
* किङ्दाओ, जनवादी गणराज्य चीन
* सान एन्टोनियो, चिली
* सैन डिएगो, क्यालिफोर्निया, संयुक्त राज्य अमेरिका
* स्यान फ्रान्सिस्को, क्यालिफोर्निया, संयुक्त राज्य अमेरिका
* सियाटल, वाशिंगटन, संयुक्त राज्य अमेरिका
* सांघाई, जनवादी गणराज्य चीन
* शेन्जेन, जनवादी गणराज्य चीन
* सिंगापुर
* सोङ्गख्ला, थाइल्याण्ड
* सिड्नी, न्यू साउथ वेल्स, अष्ट्रेलिया
* टाकोमा, वाशिंगटन, संयुक्त राज्य अमेरिका
* ताइचुङ, गणराज्य चीन (ताइवान) २.
* तालकाहुआनो, चिली
* तौरंगा, न्युजिल्याण्ड
* तियानजिन, जनवादी गणराज्य चीन
* तिजुआना, मेक्सिको
* वालपाराइसो, चिली
* भ्यान्कुभर, ब्रिटिश कोलम्बिया, क्यानाडा
* भिक्टोरिया, ब्रिटिश कोलम्बिया, क्यानाडा
* भ्लादिभोस्तोक, रुस
* सियामेन, जनवादी गणराज्य चीन
* यान्ताई, जनवादी गणराज्य चीन
* योकोहामा, जापान
 |

## स्वयादिसँ

* War of the Pacific
* Asia-Pacific Economic Cooperation
* Pacific-Antarctic Ridge
* Pacific Coast
* Pacific hurricane
* Pacific Islands
* Pacific Rim
* Pacific Time Zone
* Pacific War

## लिधँसा

## स्वयादिसँ

*Based on public domain text from US Naval Oceanographer*
* Barkley, Richard A. (1968). *Oceanographic Atlas of the Pacific Ocean*. Honolulu: University of Hawaii Press.
* (1985) *Blue Horizons: Paradise Isles of the Pacific*. Washington, D.C.: National Geographic Society. ISBN 0-87044-544-8.
* Cameron, Ian (1987). *Lost Paradise: The Exploration of the Pacific*. Topsfield, Mass.: Salem House. ISBN 0-88162-275-3.
* Couper, A. D. (ed.) (1989). *Development and Social Change in the Pacific Islands*. London: Routledge. ISBN 0-415-00917-0.
* Gilbert, John (1971). *Charting the Vast Pacific*. London: Aldus. ISBN 0-490-00226-9.
* Lower, J. Arthur (1978). *Ocean of Destiny: A Concise History of the North Pacific, 1500-1978*. Vancouver: University of British Columbia Press. ISBN 0-7748-0101-8.
* Napier, W., Gilbert, J., and Holland, J. (1973). *Pacific Voyages*. Garden City, N.Y.: Doubleday. ISBN 0-385-04335-X.
* Oliver, Douglas L. (1989). *The Pacific Islands*, 3rd ed., Honolulu: University of Hawaii Press. ISBN 0-8248-1233-6.
* Ridgell, Reilly (1988). *Pacific Nations and Territories: The Islands of Micronesia, Melanesia, and Polynesia*, 2nd ed., Honolulu: Bess Press. ISBN 0-935848-50-9.
* Soule, Gardner (1970). *The Greatest Depths: Probing the Seas to 20,000 Feet and Below*. Philadelphia: Macrae Smith. ISBN 0-8255-8350-0.
* Spate, O. H. K. (1988). *Paradise Found and Lost*. Minneapolis: University of Minnesota Press. ISBN 0-8166-1715-5.
* Terrell, John (1986). *Prehistory in the Pacific Islands: A Study of Variation in Language, Customs, and Human Biology*. Cambridge: Cambridge University Press. ISBN 0-521-30604-3.

## पिनेया स्वापूत

माला दिसं प्रशान्त महासागर
विकिस्नरी, सितिंगु खंग्वसफूय्।

* LA Times special Altered Oceans
* EPIC Pacific Ocean Data Collection Viewable on-line collection of observational data
* NOAA In-situ Ocean Data Viewer Plot and download ocean observations
* NOAA Ocean Surface Current Analyses - Realtime (OSCAR) Near-realtime Pacific Ocean Surface Currents derived from satellite altimeter and scatterometer data
* NOAA PMEL Argo profiling floats Realtime Pacific Ocean data
* NOAA TAO El Niño data Realtime Pacific Ocean El Niño buoy data