Henry Charnock (25 December 1920 – 28 November 1997) was a British meteorologist.
He is well known for his work on surface roughness and wind stress over water surfaces. The now named "Charnock's relationship" describes the aerodynamic roughness length, formula_1, over a water surface by:
formula_2
where formula_3 is the friction velocity and formula_4 is the acceleration due to gravity (typically the Standard gravity). formula_5 is Charnock's proportionality constant.
Charnock was President of the International Union of Geodesy and Geophysics (IUGG) from 1971 to 1975.
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