  We used modified Arrhenius approximations to analyze the known temperature
dependences (TDs) of water microstructure parameters and its dynamic
characteristics. The analysis of activation energies showed a significant
difference in the molecular dynamics (MD) of water in the ranges from 273 to
298 K and from 300 to 373 K. The features of MD in the first range were
associated with the metastable ice-like phase of water, in which hexagonal
clusters with tetrahedral hydrogen bonds (HBs) predominate. Based on the ratios
of the signs and values of the activation energies of HBs fluctuations and the
parameters of the microstructure, it was assumed that fluctuations of HBs
dipoles play a key role in the mechanism of resonant activation by thermal
energy of consistent reactions of deformation, rupture and formation of
tetrahedral HBs in water clusters. The synergism of these reactions and the
interaction of the charges of the vacant acceptor and donor tetrahedral
orbitals of the oxygen atom trigger at 298 K an explosive transition of the
metastable ice like phase of water into the argon like phase. The synergetics
of water dynamics above 298 K is adequately characterized by the product
diffusion on viscosity, from which TDs follow the activation energies of
reactions that determine the form of the Stokes Einstein relation in the
temperature ranges below and above the 298 K point.
