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	地衡風	渦位度逆問題解析	サーマルウィンド
分野	気象学	気象学	気象学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1857	1985	1920s
提唱者	Buys Ballot, Coriolis	Haynes, McIntyre, Hoskins	Jacobbian insights from geostrophic flow
種類	Wind balance principle	Diagnostic inversion method	Wind-temperature relationship
原典	Holton, J. R. (2004). An Introduction to Dynamic Meteorology (4th ed.). Academic Press.	Haynes, P., & McIntyre, M. E. (1987). On the evolution of vorticity and potential vorticity in the atmosphere. Journal of the Atmospheric Sciences, 44(5), 828-841.	Holton, J. R. (2004). An Introduction to Dynamic Meteorology (4th ed.). Academic Press.
別名	Geostrophic wind, Geostrophic balance, Geostrophic approximation	PV inversion, Potential vorticity, PV thinking	Thermal wind, Vertical wind shear, Barotropic
関連	3	3	3
概要	Geostrophic wind balance is a fundamental concept in meteorology that describes the balance between the pressure gradient force and the Coriolis force in large-scale atmospheric flow. When this balance is achieved, wind blows parallel to isobars without acceleration—a condition observed in the free atmosphere away from the equator and surface boundary layer.	Potential vorticity (PV) inversion is a diagnostic technique that reconstructs atmospheric wind and pressure fields from the spatial distribution of potential vorticity. This method assumes that, in a geostrophically balanced atmosphere, the PV field uniquely determines the balanced circulation around anomalies.	The thermal wind relationship is a fundamental meteorological principle that links vertical wind shear to horizontal temperature gradients. It states that wind speed increases with height in the direction of warming—a direct consequence of hydrostatic and geostrophic balance combined with the ideal gas law.