!-----------------------------
      ! Water tank shared variables
      !-----------------------------

      REAL(8) ::  v_w            !: volume of water in the tank       [m3]
      REAL(8) ::  ms_w           !: mass of salt in the water         [kg NaCl]
      REAL(8) ::  dms_i          !: change of mass of salt in the ice [kg NaCl]
      REAL(8) ::  s_w            !: salinity of the water in the tank [g/kg]
      REAL(8) ::  a_tank         !: area of the tank                  [m2]

      LOGICAL ::  ln_tank

      COMMON/wat_tank_var/v_w, ms_w, dms_i, s_w, a_tank