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Weather ship
A weather ship was a ship stationed in the ocean as a platform for surface and upper air meteorological observations for use in weather forecasting. They were primarily located in the north Atlantic and north Pacific oceans, reporting via radio. In addition to their weather reporting function, these vessels aided in search and rescue operations, supported transatlantic flights,〔〔 acted as research platforms for oceanographers, monitored marine pollution, and aided weather forecasting both by weather forecasters and within computerized atmospheric models. Research vessels remain heavily used in oceanography, including physical oceanography and the integration of meteorological and climatological data in Earth system science.
The idea of a stationary weather ship was proposed as early as 1921 by Météo-France to help support shipping and the coming of transatlantic aviation. They were used during World War II but had no means of defense, which led to the loss of several ships and many lives. On the whole, the establishment of weather ships proved to be so useful during World War II for Europe and North America that the International Civil Aviation Organization (ICAO) established a global network of weather ships in 1948, with 13 to be supplied by Canada, the United States, and Europe. This number was eventually negotiated down to nine. The agreement of the use of weather ships by the international community ended in 1985.
Weather ship observations proved to be helpful in wind and wave studies, as commercial shipping tended to avoid weather systems for safety reasons, whereas the weather ships did not. They were also helpful in monitoring storms at sea, such as tropical cyclones. Beginning in the 1970s, their role was largely superseded by weather buoys because of the ships' significant cost. The removal of a weather ship became a negative factor in forecasts leading up to the Great Storm of 1987. The last weather ship was ''Polarfront'', known as weather station M ("Mike"), which was removed from operation on January 1, 2010. Weather observations from ships continue from a fleet of voluntary merchant vessels in routine commercial operation.
== Function ==
The primary purpose of an ocean weather vessel was to take surface and upper air weather measurements, and report them via radio at the synoptic hours of 0000, 0600, 1200, and 1800 Universal Coordinated Time (UTC). Weather ships also reported observations from merchant vessels, which were reported by radio back to their country of origin using a code based on the square in the ocean within which the ship was located. The vessels were involved in search and rescue operations involving aircraft and other ships. The vessels themselves had search radar and could activate a homing beacon to guide lost aircraft towards the ships' known locations. Each ship's homing beacon used a distinctly different frequency. In addition, the ships provided a platform where scientific and oceanographic research could be conducted. The role of aircraft support gradually changed after 1975, as jet aircraft began using polar routes.〔 By 1982, the ocean weather vessel role had changed too, and the ships were used to support short range weather forecasting, in numerical weather prediction computer programs which forecast weather conditions several days ahead, for climatological studies, marine forecasting, and oceanography, as well as monitoring pollution out at sea. At the same time, the transmission of the weather data using Morse code was replaced by a system using telex-over-radio.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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