Abstract
It is a pleasure and an honor to present the citation to John M. Wahr for the Charles A. Whitten Medal, which is an award for outstanding achievement in research on the form and dynamics of the Earth. John has made fundamental advances in many areas of dynamics, including time‐variable gravity, Earth rotation, Earth and ocean tides, interaction of the atmosphere and ocean with the Earth, postglacial deformation, and nutation. He has published papers in geodesy, geodynamics, seismology, geomagnetism, hydrology, cryospheric sciences, oceanography, atmospheric sciences, planetary sciences, and even general relativity.John is a major intellectual leader in much of geophysics with a heavy emphasis on global‐scale problems involving the fluid envelope. John broke new ground with his work in the application of geodetic data to geophysical problems, including global tides, barometric response of the oceans, and Earth rotation. His unique contributions came from developing the theory, and modeling Earth tides, nutations, and various other types of rotational and deformational motion. Both the Earth tide model and the nutation model served as the adopted international standards for almost 20 years. His cutting‐edge work on time‐variable gravity has enabled him to blaze a new trail for interdisciplinary geodesy.
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