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词汇 Thermal wind
分类 英语词汇 英语翻译词典
释义

Thermal wind

英语百科

Thermal wind

Jet streams (shown in pink) are well-known examples of thermal wind. They arise from the horizontal temperature gradient from the warm tropics to cold polar regions.
The vertical variation of geostrophic wind in a barotropic atmosphere (a) and in a baroclinic atmosphere (b). The blue portion of the surface denotes a cold region while the orange portion denotes a warm region. Temperature difference is restricted to the boundary in (a) and extends through the region in (b). The dotted lines enclose isobaric surfaces which remain at constant slope with increasing height in (a) and increase in slope with height in (b). This causes thermal wind to occur only in a baroclinic atmosphere.
In (a), cold advection is occurring, so the thermal wind causes the geostrophic wind to rotate counterclockwise (for the northern hemisphere) with height. In (b), warm advection is occurring, so the geostrophic wind rotates clockwise with height.

Thermal wind is the vertical shear in the geostrophic wind caused by a horizontal temperature gradient. The name is a misnomer; it is not a wind itself but rather a wind shear.
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