Tasman Sea
Tasman Sea "The Ditch" | |
---|---|
Location | Western Pacific Ocean |
Coordinates | 40°S 160°E / 40°S 160°E |
Type | Sea |
Basin countries | Australia, New Zealand |
Max. length | 2,800 km (1,700 mi) |
Max. width | 2,200 km (1,400 mi) |
Surface area | 2,300,000 km2 (890,000 sq mi) |
Islands | Lord Howe Island, Norfolk Island |
Benches | Lord Howe Rise |
Settlements | Newcastle, Sydney, Wollongong, Hobart (Australia) Auckland, Wellington, New Plymouth, Whanganui (New Zealand) |
The Tasman Sea is a
The Tasman Sea is informally referred to in both
Climate
The south of the sea is passed over by depressions going from west to east. The northern limit of these westerly winds is near to 40°S. During the southern winter, from April to October, the northern branch of these winds from the west changes its direction toward the north and goes up against trade winds. Hence, the sea receives frequent winds from the southwest during this period. In the Australian summer (from November to March), the southern branch of the trade winds goes up against west winds and produces further wind activity in the area.[2]
Geography
The Tasman Sea is 2,250 km (1,400 mi) wide and has an area of 2,300,000 km2 (890,000 sq mi).[1] The maximum depth of the sea is 5,943 m (19,498 ft).[3] The base of the sea is made up of globigerina ooze. A small zone of pteropod ooze is found to the south of New Caledonia and to the southern extent of 30°S, siliceous ooze can be found.[4]
Extent
The International Hydrographic Organization defines the limits of the Tasman Sea as:[5]
On the West A line from Gabo Island (near Cape Howe, 37°30'S) to the northeast point of East Sister Island (148°E), thence along the 148th meridian to Flinders Island; beyond this island a line running to the eastward of the Vansittart Shoals to [Cape] Barren Island, and from Cape Barren (the easternmost point of [Cape] Barren Island) to Eddystone Point (41°S) in Tasmania, thence along the east coast to South East Cape, the southern point of Tasmania.
On the North The parallel of 30°S from the Australian coast eastward as far as a line joining the east extremities of Elizabeth Reef and South East Rock (31°47′S 159°18′E / 31.783°S 159.300°E) then to the southward along this line to the South East Rock [an outlier of Lord Howe Island].
On the Northeast From the South East Rock to the north point of
North Capein New Zealand.On the East
- In Cook Strait. A line joining the south extreme of the foul ground off Cape Palliser (Ngawi) and the Lighthouse on Cape Campbell (Te Karaka).
- In
Stewart Island (Rakiura).On the Southeast A line running from
South West Cape, Stewart Island, through the Snares (48°S, 166°30'E) to North West Cape, Auckland Island (50°30′S 166°10′E / 50.500°S 166.167°E), through this island to its southern point.On the South A line joining the southern point of Auckland Island (50°55′S 166°0′E / 50.917°S 166.000°E) to South East Cape, the southern point of Tasmania.
Ridge
The Tasman Sea's
Islands
The Tasman Sea features a number of midsea island groups, quite apart from coastal islands located near the Australian and New Zealand mainlands:
- Lord Howe Island (part of New South Wales)[7]
- Ball's Pyramid (part of New South Wales)[8]
Adjoining bodies of water
- North: Coral Sea[9]
- Northeast and East: Pacific Ocean
- East: Cook Strait
- South and southeast: Southern Ocean
- West: Bass Strait[10]
Currents
The East Australian Current that commences its flow southwards in the tropics of the Coral Sea, near the eastern coast of Australia is the most energetic circulation feature in the south western Pacific Ocean and is a primary means of heat transport from the tropics to the middle latitudes between Australia and New Zealand.[11]: 1458 The East Australian Current is a return of the westward-flowing Pacific Equatorial Current (Pacific South Equatorial Current).[12] At the juncture between the Tasman and Coral seas while the East Australian Current continues south in the western Tasman a branch flows east called the Tasman Front towards the north of New Zealand with most continuing eastward above New Zealand into the South Pacific Ocean.[12] It transpires that while predominantly the location of westerly wind stress is a factor in how far north the formation of the Tasman Front occurs, so is the presence of the New Zealand land mass, as the top of New Zealand defines the furtherest south that the Tasman Front can be split off by the westerly winds.[11]: 1457, 1467–8 A boundary current called the East Auckland Current goes down the west coast of the North Island and further south the East Cape Current, that has been diverted towards the South Island by the shapes of the Lord Howe Rise and southern east coast of the North island continues to the south.[11]: 1458 [12] The East Australian Current south of Tasmania also is diverted west in the Subtropical Front which collides with the western moving Subantarctic front of the Antarctic Circumpolar Current.[12] The East Australian Current shreds eddy's on its way south that move south-westward with some known as the Tasman Leakage making it as far westward as the Indian Ocean.[11]: 1458
Animal and plant life
A deep-sea research ship, the RV Tangaroa, explored the sea and found 500 species of fish and 1300 species of invertebrates. The tooth of a megalodon, an extinct shark, was also found by researchers.[13]
History
In 1876, the first
See also
- Axis naval activity in New Zealand waters
- List of seas
References
- ^ a b "Tasman Sea". Encyclopædia Britannica. Retrieved 3 January 2018.
- ^ Rotschi & Lemasson 1967, p. 54.
- ^ "Depth of the sea" (PDF). Retrieved 23 April 2018.
- ^ Rotschi & Lemasson 1967, p. 51.
- ^ "Limits of Oceans and Seas, 3rd edition" (PDF). International Hydrographic Organization. 1953. p. 36. Retrieved 28 December 2020.
- .
- ^ "Lord Howe Island, Tasman Sea, Australia". volcano.oregonstate.edu. Retrieved 23 April 2018.
- ^ "Ball's Pyramid". Unusual Places. 5 September 2013. Retrieved 23 April 2018.
- .
- ^ "Mysterious ocean feature found in Tasman Sea". Australian Geographic. 24 February 2012. Retrieved 23 April 2018.
- ^ hdl:1885/203237.}
- ^ .: Section 2. Tasman Sea Setting
- ^ "Tasman Sea produces freaky species". CBC News. 30 June 2003. Retrieved 23 April 2018.
- ISBN 9781927167038.
- ^ "Trans-Tasman Telegraph Cable Numbers 1 and 2". Engineering New Zealand. Retrieved 24 May 2023.
- ^ Anne Barrowclough (14 March 2010). "Kiwi becomes second person to row across the Tasman Sea". Times Online. Times Newspapers. Retrieved 22 May 2011.
Further reading
- Rotschi, H.; Lemasson, L. (1967), Oceanography of the Coral and Tasman Seas (PDF), Oceanogr Marine Biol Ann Rev, ASIN B00KJ0X6D4
- Tracking the Tasman Sea's Hidden Tide on Schmidt Ocean Institute
External links
- Media related to Tasman Sea at Wikimedia Commons