An equatorial thermal wind equation: Applications to Jupiter
| Autor: | Philip Marcus, Joshua Tollefson, Michael H. Wong, Imke de Pater |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Equator Galileo Probe Astronomy and Astrophysics Thermal wind Geophysics 01 natural sciences Jovian Physics::Geophysics Latitude Rossby number Jupiter Space and Planetary Science Wind shear Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Icarus. 324:198-223 |
| ISSN: | 0019-1035 |
| DOI: | 10.1016/j.icarus.2018.09.037 |
| Popis: | To relate the vertical wind shear to horizontal temperature gradients at and near the equator, we derive an “Equatorial Thermal Wind Equation” (EQTWE) using a minimum set of assumptions that are easily satisfied for the atmospheres of all the giant planets and Earth. Similar to the textbook Thermal Wind Equation (TWE), the EQTWE requires a small Rossby number, but the relevant Rossby number for the EQTWE depends on the velocity and length scales of the equatorial flows, and on the Coriolis parameter at the north pole (which is large), rather than the Coriolis parameter at the equator (which goes to zero). Unlike the TWE, the EQTWE is valid only for the east-west component of the wind. We apply the EQTWE to the Jovian wind measured by the Galileo probe Doppler wind experiment at jovicentric latitude 6.53°N (7.46°N jovigraphic), which is valid because the EQTWE is accurate at latitudes θ |
| Databáze: | OpenAIRE |
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