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        "description": "The wave calculation linearizes idealized horizontal flow around a specified zonal background with a constant Coriolis gradient. Latitude-dependent shear, forcing and depth corrections need additional approximations; some extensions in the original remain incomplete. Weather illustrations are not causal proof or held-out forecast skill. The source’s collective and individually named contributors retain their distinct roles.",
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      "statement": "# Rossby and collaborators: how planetary waves move through the westerlies\n\nThe1939paper relates large-scale pressure-pattern motion to changes of zonal circulation using absolute-vorticity conservation and an explicitly simplified latitude-dependent rotating-fluid calculation.\n\nAs an air column moves north or south,the Earth's contribution to its spin changes. In the paper's idealizedmodel,thecolumn's relative spin compensates,and that constraint makes a wavypattern move at a speed depending on wavelength and background wind. A pattern can standstill even while airpasses throughit. Rossby links this mechanism to contemporaryweathercharts while distinguishing forced geographical patterns fromfreewaves. The originalbyline saysRossbyandcollaborators: H.C.Willett led synopticcharts withJ.Holmboe/J.Namias; L.Page ledstatisticalwork withR.Allen. Their named work is retained without assuming identical roles.\n\n## Scientific scope\n\nThe wave calculation linearizes idealized horizontal flow around a specified zonal background with a constant Coriolis gradient. Latitude-dependent shear, forcing and depth corrections need additional approximations; some extensions in the original remain incomplete. Weather illustrations are not causal proof or held-out forecast skill. The source’s collective and individually named contributors retain their distinct roles.\n\n## People and systems\n\nCarl-Gustaf Rossby\n\n\n\n## Original sources\n\n- [Rossby and collaborators:Relation between zonal circulation and centers of action(1939),original38–55](https://empslocal.ex.ac.uk/people/staff/gv219/classics.d/Rossby_collab39.pdf)\n- [YaleJMR1939repositorymetadata and expanded recommended citation](https://elischolar.library.yale.edu/journal_of_marine_research/544/)\n",
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