In this paper we consider the influence of lowfre� quency oceanic acoustic noise on the fluctuations of hydrophysical fields in a marine environment. We obtained the estimates of the spectral levels of fluctua� tions of the temperature, sound velocity, electric con� ductivity, and light refractive index caused by the nat� ural noises of the ocean in the range from 0.1 to 100 Hz. Accounting for these additional fluctuations is impor� tant in the analysis of the physical nature of hydro� physical processes, development of methods of their recording and distinguishing, and creation of new marine measuring systems. Hydrothermodynamics and hydroacoustics are interrelated components of oceanology in the system of the Earth sciences (1). Hydrothermodynamic pro� cesses in the ocean are taken into account in the tradi� tional schemes of basic and applied acoustic studies in the description of the channels for the propagation of acoustic waves. The hydrodynamic structure of the ocean is considered as the background for the propa� gation of acoustic waves. In the general case, energy transfer from acoustic modes of different processes to hydrothermodynamic processes and vice versa is pos� sible (2, 3). At the same time, the problem of back� ground acoustic modulation of natural hydrophysical fields in the ocean remains open. Therefore, there are theoretical and practical interests to estimate the levels of fluctuations of the thermodynamic state parameters in the marine environment caused by underwater acoustic noises of the ocean, which determine the minimum levels of these fluctuations (4-6). Let us consider the composition of two models of the marine environment to get such estimates (1). The first model is a model of a mute (noiseless) ocean described by the equations of hydrothermody� namics for an incompressible fluid, in which acoustic fields do not exist. The second model is a model of a noisy ocean described by the wave equations of a compressible