Abstract
The following article presents the results of the adjustment (by means of the classical least squares method) of 3-year series of gravimetric Earth tides observations recorded in Observatory at Jozefoslaw (Józefosław - Poland) using LaCoste&Romberg model ET-26 gravimeter. The set of atmospheric data (pressure, temperature and humidity) has been taken into account in the analysis. Several models of ocean's tides were compared to find out how large the indirect effect in Jozefoslaw is. Hydrological observations were made parallel to the gravity storage (soil moisture, water table changes, and rainfalls) to specify its influence to the gravity. Joint adjustment allowed us to determine reliable and precise model of gravimetric Earth tides for Jozefoslaw, which is an indispensable element for every geodynamical observatory. From 3-year data series we were able to obtain parameters (amplitude factor and phase shift) for 31 tidal components. The accuracy of single observation after adjustment (4.2 nm/s^2) and the drift (-4.5 nm/s^2 per month) are acceptable for this type of equipment. It is worth indicating that these observations are one of the most accurate that have ever been carried out in Poland.