Gulf of Carpentaria

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The location of the Gulf of Carpentaria.
The Gulf of Carpentaria from an 1859 Dutch map
The Gulf of Carpentaria between Bentinck Island (South Wellesley Islands) and the Australian continent
Loading ore from McArthur River zinc mine at Bing Bong Loading Facility, 2011

The Gulf of Carpentaria (14°S 139°E / 14°S 139°E / -14; 139Coordinates: 14°S 139°E / 14°S 139°E / -14; 139) is a large, shallow sea enclosed on three sides by northern Australia and bounded on the north by the Arafura Sea (the body of water that lies between Australia and New Guinea). The northern boundary is generally defined as a line from Slade Point, Queensland (the northwestern corner of Cape York Peninsula) in the northeast, to Cape Arnhem, Northern Territory (the easternmost point of Arnhem Land) in the west.

At its mouth, the Gulf is 590 km wide, and further south, 675 km. The north-south length exceeds 700 km. It covers a water area of about 300,000 km². The general depth is between 55 and 66 metres (30 and 36 fm) and does not exceed 82 metres (45 fm).[1] The tidal range in the Gulf of Carpentaria is between two and three metres.[2] In geological terms, the Gulf is young; the Sahul Shelf that underlies it was dry land as recently as the last ice age. It is believed to be the location of a major asteroid impact event in 536 A.D.[3]

European exploration[edit]

The first known European explorer to visit the region was the Dutch Willem Janszoon (whose name is also written as Jansz) in his 1606 voyage. His fellow countryman, Jan Carstenszoon (or Carstensz), visited in 1623 and named the gulf in honour of Pieter de Carpentier, at that time the Governor-General of the Dutch East Indies. Abel Tasman also explored the coast in 1644. The region was later explored and charted by Matthew Flinders in 1802 and 1803.

The first overland expedition to reach the Gulf was the Burke and Wills expedition, led by Robert O'Hara Burke and William John Wills which left Melbourne, Victoria in August 1860 and reached the Bynoe River, Queensland in February 1861.

Geography[edit]

The land bordering the Gulf is generally flat and low-lying. To the west is Arnhem Land, the Top End of the Northern Territory, and Groote Eylandt, the largest island in the Gulf. To the east is the Cape York Peninsula. The area to the south (like the Cape York Peninsula, part of Queensland) is known as the Gulf Country or simply "the Gulf."

The climate is hot and humid with two seasons per year. The dry season lasts from about April until November and is characterized by very dry southeast to east winds, generated by migratory winter high pressure systems to the south. The wet season lasts from December to March. Most of the year's rainfall is compressed into these months, and during this period, many low-lying areas are flooded. The Gulf is prone to cyclones during the period between November and April. The gulf experiences an average of three cyclones each year.[2]

In many other parts of Australia, there are dramatic climatic transitions over fairly short distances. The Great Dividing Range, which parallels the entire east and south-east coast, is responsible for the typical pattern of a well-watered coastal strip, a fairly narrow band of mountains, and then a vast, inward-draining plain that receives little rainfall. In the Gulf Country, however, there are no mountains to restrict rainfall to the coastal band and the transition from the profuse tropical growth of the seaside areas to the arid scrubs of central Australia is gradual.

In September and October the Morning Glory cloud appears in the Southern Gulf. The best vantage point to see this phenomenon is in the Burketown area shortly after dawn.

Major rivers[edit]

In the Top End the Roper River and Wilton River flow into the Gulf. The Cox River, Calvert River, Leichhardt River, McArthur River, Flinders River, Norman River and the Gilbert River drain the Gulf Country. A number of rivers flow from the Cape York Peninsula into the Gulf, including Smithburne River, Mitchell River, Alice River, Staaten River, Mission River, Wenlock River and Archer River.

Industry[edit]

Extensive areas of seagrass beds have allowed commercial shrimp operations in the Gulf.[4] Zinc, lead and silver is mined from the McArthur River zinc mine and exported via the Gulf. Another zinc mine, Century Zinc is in the gulf on the Queensland side of the border. It exports its product through the port facility at Karumba. The cattle industry is also a very import part of the regional economy in the gulf.

According to the then Chairman of the Gulf of Carpentaria's Commercial Fisherman's Organisation, Gary Ward, the number of sightings of Indonesian vessels fishing illegally in the gulf's waters increased in early 2005.[5] By 2011 the numbers of illegal fishing boat interceptions had declined significantly with the cause attributed to enforcement efforts and education programs in Indonesia.[6]

Major port plan[edit]

In 2012, a major new port located to the west of Karumba and rail connection to the North West Minerals Province was proposed by Carpentaria Rail. The advantages of a port at Karumba compared to Townsville was that it was three or four days closer to Asia via shipping routes.[7]

Physiography[edit]

The Gulf is one of the distinct physiographic sections of the larger (and surrounding) Carpentaria Basin province, which in turn is part of the larger East Australian Basins physiographic division.

References[edit]

  1. ^ http://permanent.access.gpo.gov/websites/pollux/pollux.nss.nima.mil/NAV_PUBS/SD/pub175/175sec01.pdf
  2. ^ a b David Hopley; Scott Smithers (2010). "Queensland". In Eric C.F. Bird. Encyclopedia of World's Coastal Landforms. Springer. p. 1255. ISBN 978-1-4020-8638-0. 
  3. ^ Richard A. Lovett (3 February 2010). Giant Meteorites Slammed Earth Around A.D. 500?. National Geographic News. National Geographic Society. Retrieved 3 March 2013.
  4. ^ Tomascik, Tomas; Anmarie Janice Mah, Anugerah Nontji & Mohammad Kasin Moosa (1997). The Ecology of the Indonesian Seas: Part Two. Periplus Editions. p. 829. ISBN 962-593-163-5. Retrieved 17 November 2011. 
  5. ^ Ian Townsend (18 April 2005). "Govt to step up Gulf of Carpentaria patrols". PM (radio program) (Australian Broadcasting Corporation). Retrieved 28 September 2012. 
  6. ^ Paul Sutherland (10 November 2011). "Less illegal fishing in the Gulf of Carpentaria". ABC News (Australian Broadcasting Corporation). Retrieved 28 September 2012. 
  7. ^ Nick Dalton (28 June 2013). "Port plan could see hundreds of jobs and build strong export links". The Cairns Post (News Limited). Retrieved 11 July 2013. 

External links[edit]