Harald Sverdrup (oceanographer)

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Harald Ulrik Sverdrup (15 November 1888 – 21 August 1957) was a Norwegian oceanographer and meteorologist. He served as director of the Scripps Institution of Oceanography and the Norwegian Polar Institute.<ref name=nbl>Template:Cite web</ref><ref>Template:Cite web</ref>

Background

He was born at Sogndal in Sogn og Fjordane, Norway. He was the son of Lutheran theologian Edvard Sverdrup (1861–1923) and Maria Vollan (1865–1891). His sister Mimi Sverdrup Lunden (1894–1955) was an educator and author. His brother Leif Sverdrup (1898–1976) was a General with the U.S. Army Corps of Engineers. His brother Einar Sverdrup (1895–1942) was CEO of Store Norske Spitsbergen Kulkompani.<ref>Template:Cite web</ref>

Sverdrup was a student at Bergen Cathedral School in 1901 before graduating in 1906 at Kongsgård School in Stavanger. He graduated cand. real. in 1914 from University of Oslo. He studied under Vilhelm Bjerknes and earned his Dr. Philos. at the University of Leipzig in 1917.<ref>Template:Cite ANB</ref>

Career

He was the scientific director of the North Polar expedition of Roald Amundsen aboard the Maud from 1918 to 1925. His measurements of bottom depths, tidal currents, and tidal elevations on the vast shelf areas off the East Siberian Sea correctly described the propagation of tides as Poincare waves. Upon his return from this long expedition exploring the shelf seas to the north of Siberia, he became the chair in meteorology at the University of Bergen.<ref>Template:Cite web</ref>

He was made director of California's Scripps Institution of Oceanography in 1936, initially for three years but the intervention of World War II meant he held the post until 1948. During 33 expeditions with the research vessel E. W. Scripps between 1938 and 1941, he produced a detailed oceanographic dataset off the coast of California. He also developed a simple theory of the general ocean circulation postulating a dynamical vorticity balance between the wind-stress curl and the meridional gradient of the Coriolis parameter, the Sverdrup balance. This balance describes wind-driven ocean gyres away from continental margins at western boundaries.<ref>Template:Cite web</ref>

After leaving Scripps, he became director of the Norwegian Polar Institute in Oslo and continued to contribute to oceanography, ocean biology, and polar research. In biological oceanography, his critical depth hypothesis (published in 1953) was a significant milestone in the explanation of spring blooms of phytoplankton.<ref name=Sverdrup>Template:Cite journal</ref>

Sverdrup was a member of both the United States National Academy of Sciences,<ref>Template:Cite web</ref> the Norwegian Academies of Science, the American Academy of Arts and Sciences,<ref>Template:Cite web</ref> and the American Philosophical Society.<ref>Template:Cite web</ref> He served as President of the International Association of Physical Oceanography and of the International Council for the Exploration of the Sea (ICES). His many publications include his magnum opus The Oceans: Their Physics, Chemistry and General Biology by Sverdrup, Martin W. Johnson and Richard H. Fleming (1942, new edition 1970) which formed the basic curriculum of oceanography for the next 40 years around the world.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

Personal life

In 1928, he married Gudrun (Vaumund) Bronn (1893–1983) and adopted her daughter Anna Margrethe.<ref name="nbl"/>

Honors

He was awarded the William Bowie Medal by the American Geophysical Union, the Alexander Agassiz Medal of the National Academy of Sciences, the Patron's Medal of the Royal Geographical Society, the Vega Medal by the Swedish Society for Anthropology and Geography and the Swedish Order of the Polar Star.<ref>Template:Cite web</ref>

Legacy

File:MS H.U. Sverdrup II in Stavanger 2012.jpg

MS H.U. Sverdrup II research vessel

The Sverdrup, a unit describing the volume of water transport in ocean currents, is named after Harald Sverdrup.<ref>Template:Cite journal</ref> 1 Sverdrup is a volume flux of one million cubic meters per second (1 Sv = 10⁶ m³ per second).<ref>Template:Cite web</ref>

The Sverdrup Gold Medal Award was named in his honor by the American Meteorological Society.<ref>Template:Cite web</ref>

The Norwegian research vessel Template:Ship is named in his honor.<ref>Template:Cite web</ref>

In 1977, the UK-APC named a series of peaks in Palmer Land, Antarctica the Sverdrup Nunataks after him.