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We show that the use of Doppler shifts of Zeeman sensitive spectral lines toobserve wavesn in sunspots is subject to measurement specific phase shiftsarising from, (i) altered height range of spectral line formation and thepropagating character of p mode waves in penumbrae, and (ii) Zeeman broadeningand splitting. We also show that these phase shifts depend on wave frequencies,strengths and line of sight inclination of magnetic field, and the polarizationstate used for Doppler measurements. We discuss how these phase shifts couldcontribute to local helioseismic measurements of 'surface effects' in sunspotseismology.Comment: 12 pages, 4 figures, Accepted for publication in the Astrophysical  Journal Letter

Radiative Transfer Effects on Doppler Measurements as Sources of Surface Effects in Sunspot Seismology