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報告摘要：We give a Poisson geometric interpretation of certain maps introduced by Knutson, Woo, and Yong in their work relating singularities of Richardson varieties and of Schubert varieties in flag varieties of a complex semisimple Lie group G. The KWY maps give rise to an atlas on the flag variety G/B of Borel subgroups of G, with one affine coordinate chart for each element in the Weyl group W of G. In each of these coordinate charts, we give explicit formulas for the quotient standard Poisson structures on G/B. The result gives a covering of G/B by Poisson CGLs.