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We calculate the atmospheric structure of an accretion disk around a Kerrblack hole and obtain its X-ray spectrum, which exhibits prominent atomictransitions under certain circumstances. The gravitational and Doppler(red)shifts of the C V, C VI, O VII, O VIII, and Fe I-XXVI emission lines areobservable in active galaxies. We quantify the line emissivities as a functionof radius, to identify the effects of atmospheric structure, and to determinethe usefulness of these lines for probing the disk energetics. The lineemissivities do not always scale linearly with the incident radiative energy,as in the case of Fe XXV and Fe XXVI. Our model incorporates photoionizationand thermal balance for the plasma, the hydrostatic approximation perpendicularto the plane of the disk, and general relativistic tidal forces. We includeradiative recombination rates, fluorescence yields, Compton scattering, andphotoelectric opacities for the most abundant elements.Comment: 4 pages, 1 figure, to appear in the Proc. of the 10th Marcel  Grossmann Meeting on General Relativity, World Scientific, Rio de Janeiro,  July 20-26, 200

ATOMIC X-RAY SPECTRA OF ACCRETION DISK ATMOSPHERES IN THE KERR METRIC