Oceanographic measurements obtained in the northeastern Greenland Sea-Fram Strait region were studied in order to characterize internal wave activity in the marginal ice zone (MIZ) of the Arctic Ocean. Experiments were performed with an array of four horizontally separated current meters and a CTD instrument in 1984 as part of the Marginal Ice Zone Experiment. Spectra of horizontal and vertical motion show that within the frequency range from the inertial frequency to 3 cph the MIZ internal wave field is similar in spectral shape and energy content to the wave field found beneath Arctic pack ice. Above 3 cph the MIZ spectra contain more energy than expected based upon both beneath-ice measurements and the Garrett-Munk model spectra. Elevated energy levels at high frequencies are shown to be caused by intermittent increases in internal wave activity occurring on time scales from 2 to 12 hours. Phase differences between pairs of time series, computed during the passage of several packets of internal waves, are used to estimate horizontal wave number vectors. A comparison of the calculated wave number vectors to a dispersion relation derived from a simple normal mode model of internal waves suggests that the wave packets may be adequately described as being comprised of lowest-mode, horizontally propagating internal waves. The interaction of ice-bottom topography with a sharp, elevated pycnocline is explored as a possible source of the intermittent increases in wave activity. Spectra of vertical displacement and velocity computed from time series of both temperature and density are presented in order to show the influence of intrusive activity in the MIZ. Differences in both spectral shape and energy content, found at frequencies below 2.5 cph, emphasize the need for careful interpretation of temperature-based measurements of vertical motion obtained over long periods of time in the MIZ. ¿ American Geophysical Union 1990