Vitiaz Strait

Hydrography

The 1200 m deep Vitiaz Strait "was a focus of attention by Australian and USA oceanographers on voyages in 1985, 1986, 1988, 1991 and 1992 as part of the Western Equatorial Pacific Ocean Circulation Study, WEPOCS".

The New Guinea Coastal Undercurrent transports "high-salinity, low-tritium, high-oxygen, low-nutrient water from the Solomon Sea northwestward along the north coast of Papua New Guinea through the Vitiaz Strait".

However, the surface layer current running through the strait, the New Guinea Coastal Current, experiences a seasonal reversal. In boreal summer (northern hemisphere summer) characterized by the south-easterly monsoon, the westward current dominates; during boreal winter (northern hemisphere winter) under the influence of the northwesterly monsoonal winds, the eastward flow dominates.

European encounters

Abel Tasman sighted Umboi Island in the Vitiaz Strait in 1643 but failed to realise that the Strait separated the island from the coast of New Guinea. William Dampier charted the passage now named Dampier Strait between Umboi Island and New Britain in 1700 Dampier had established that the land mass he named New Britain was an island. As he sailed northwesterly through the passage, Dampier charted and named various islands which lay between the Dampier and Vitiaz Straits: Sir George Rook's Island (later Rooke Island, now Umboi Island), Long Island (Arop Island) and Crown Island.

World War II

During the New Guinea Campaign (1942-1945), control of the Vitiaz Strait took on strategic military importance. The Japanese landed two battalions at Lae and Salamaua on the Huon Gulf on 8 March 1942 giving them control of the Dampier and Vitiaz Straits. Japanese forces lost control of the Vitiaz and Dampier Straits after the capture of Finschhafen by Australian troops and the later landing of American forces on New Britain (December 1943). General Douglas MacArthur announced that Rooke Island (now called Umboi Island) had been occupied on Saturday 12 February 1944 by American forces who met no opposition. Allied control was made secure by landings in the Admiralty Islands on 29 February 1944.

Notes

References

1. George R. Cresswell 2000 'Coastal currents of northern Papua New Guinea, and the Sepik River outflow' ''Marine Freshwater Research'' 51 pp 553–64 at p 553
2. Walter Zenk, Gerold Siedler, Akio Ishida, Jürgen Holfort, Yuji Kashino, Yoshifumi Kuroda, Toru Miyama, Thomas J. Müller 2005 'Pathways and variability of the Antarctic Intermediate Water in the western equatorial Pacific Ocean' ''Progress in Oceanography'' 67 pp 245–281 at p 247, see map at Fig.2(a) p 248
3. "R. W. de M.-Maclay, 'Mikluho-Maklai, Nicholai Nicholaievich (1846 - 1888)', "Australian Dictionary of Biography"".
4. George R. Cresswell 2000 'Coastal currents of northern Papua New Guinea, and the Sepik River outflow' ''Marine Freshwater Research'' 51 pp553–64 at 553
5. M. Tsuchiya, R. Lukas, R. A. Fine, E. Firing, E. Lindstrom, 1989 'Source waters of the Pacific Equatorial Undercurrent.' ''Progress in Oceanography'' 23, pp 101–47 at p 101
6. Yoshifui Kuroda 2000 Variability of Currents off the Northern Coast of New Guinea ''Journal of Oceanography'' 56 pp 103-116 at p 107
7. [[Matthew Spriggs]] (1997) ''The island Melanesians'' p 242 drawing on Andrew Sharp (1968) ''The Voyages of Abel Janszoon Tasman''
8. [[Matthew Spriggs]] (1997) ''The island Melanesians'' p 242-3 citing William Dampier (1906 ed. John Masefield) ''Dampier's voyages'' Vol II pp 522-45
9. William Dampier, ''A Continuation of a Voyage to New Holland'' [http://www.gutenberg.org/files/15685/15685-h/15685-h.htm#ch4 Ch. 4 New Britain Discovered]
10. 'New Guinea campaign' in I. C. B. Dear and M. R. D. Foot (eds) (2001) ''The Oxford Companion to World War II''
11. John Coates 'New Guinea Campaign' in Peter Dennis, Jeffrey Grey, Ewan Morris, Robin Prior and Jean Bou (eds) (2009) ''The Oxford Companion Australian Military History''
12. 'U.S. Troops Seize Vitiaz Strait Isle' ''New York Times'' 15 Feb 1944 p 6
13. Frank Dexter 'Rooke Island Occupied' ''The Argus'' (Melbourne, Victoria) Wed 16 Feb 1944 p 16
14. John Coates 'New Guinea Campaign' in Peter Dennis, Jeffrey Grey, Ewan Morris, Robin Prior and Jean Bou (eds) (2009) ''The Oxford Companion Australian Military History''