# Difference between revisions of "Turner angle"

From Glossary of Meteorology

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== Turner angle == | == Turner angle == | ||

− | <div class="definition"><div class="short_definition">A [[parameter]] used to define the local [[stability]] of an inviscid [[water]] column to double-diffusive [[convection]].</div><br/><div class="paragraph">It is defined as <div class="display-formula"><blockquote>[[File:ams2001glos-Te48.gif|link=|center|ams2001glos-Te48]]</blockquote></div> where tan<sup>−1</sup> is the four-quadrant arctangent | + | <div class="definition"><div class="short_definition">A [[parameter]] used to define the local [[stability]] of an inviscid [[water]] column to double-diffusive [[convection]].</div><br/><div class="paragraph">It is defined as <div class="display-formula"><blockquote>[[File:ams2001glos-Te48.gif|link=|center|ams2001glos-Te48]]</blockquote></div> where tan<sup>−1</sup> is the four-quadrant arctangent; ''α'' is the [[coefficient of thermal expansion]]; ''β'' is the equivalent coefficient for the addition of [[salinity]], sometimes referred to as the "coefficient of saline contraction;" ''T'' is [[temperature]]; and ''S'' is [[salinity]]. If −45° < Tu < 45°, the column is [[static stability|statically stable]]. If −90° > Tu or Tu > 90°, the column is statically unstable to Rayleigh–Taylor [[instability]]. If −90° < Tu < −45°, the column is unstable to [[diffusive convection]]. If 45° < Tu < 90°, the column is unstable to [[salt fingering]].</div><br/> </div> |

− | ''Term edited | + | ''Term edited 8 March 2021'' |

{{TermIndex}} | {{TermIndex}} |

## Latest revision as of 06:25, 8 March 2021

## Turner angle

A parameter used to define the local stability of an inviscid water column to double-diffusive convection.

It is defined as where tan

^{−1}is the four-quadrant arctangent;*α*is the coefficient of thermal expansion;*β*is the equivalent coefficient for the addition of salinity, sometimes referred to as the "coefficient of saline contraction;"*T*is temperature; and*S*is salinity. If −45° < Tu < 45°, the column is statically stable. If −90° > Tu or Tu > 90°, the column is statically unstable to Rayleigh–Taylor instability. If −90° < Tu < −45°, the column is unstable to diffusive convection. If 45° < Tu < 90°, the column is unstable to salt fingering.*Term edited 8 March 2021*