Numerical modelling of the Caspian Sea tides Igor Medvedev1, 2, Evgueni Kulikov1, Isaac Fine3 1Shirhov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia 2Fedorov Institute of Applied Geophysics, Moscow, Russia 5 3Institute of Ocean Sciences, Sidney, B.C., Canada Correspondence to: Igor Medvedev (
[email protected]) Abstract. The Caspian Sea is the largest enclosed basin on Earth and a unique subject for the analysis of tidal dynamics. Tides in the basin are produced directly by the tide-generating forces. Using the Princeton Ocean Model (POM), we examine details of the spatial and temporal features 10 of the tidal dynamics in the Caspian Sea. We present tidal charts of the amplitudes and phase lags of the major tidal constituents, together with maps of the form factor, tidal range, and tidal current speed. Semidiurnal tides in the Caspian Sea are determined by a Taylor amphidromic system with counterclockwise rotation. The largest M2 amplitude is 6 cm and is located in Turkmen Bay. For the diurnal constituents, the Absheron Peninsula separates two individual amphidromes with 15 counterclockwise rotation in the north and in the south. The maximum K1 amplitudes (up to 0.7– 0.8 cm) are located in: 1) the southeastern part of the basin; 2) Türkmenbaşy Gulf; 3) Mangyshlak Bay; and 4) Kizlyar Bay. As a result, the semidiurnal tides prevail over diurnal tides in the Caspian Sea. The maximum tidal range, of up to 21 cm, has been found in Turkmen Bay. The strongest tidal currents have been located in the straits to the north and south of Ogurja Ada, where speeds 20 reach 22 cm/s and 19 cm/s, respectively.