Accession Number : ADA130423

Title :   Chemical Sound Absorption in Sea Water: Low-Frequency Relaxation Mechanism.

Descriptive Note : Technical rept.,

Corporate Author : MAR INC EAST LYME CT

Personal Author(s) : Mellen,Robert H

PDF Url : ADA130423

Report Date : Apr 1983

Pagination or Media Count : 71

Abstract : Resonator measurements measurements indicate that the principal B(OH)-3 absorption mechanism in sea water is an exchange between the B(OH)3/B(OH)-4 and HCO-3/CO3-2 equilibria in which coupling to the Ca2+ ion-pairing equilibria provides most of the molal volume change. If either Ca or CO2 are omitted, B(OH)3 absorption is an order of magnitude too low. T-jump measurements indicate a two-step B(OH)3 ionization process in H2O. In sea water, both relaxations occur and are coupled. Present theory shows that pH and absorption may have different relaxation frequencies as experimental data indicates. The empirical pH-dependent absorption formula derived from ocean measurements gives predictions that are consistent with the exchange relaxation model.

Descriptors :   *Acoustic absorption, *Sea water, *Chemical oceanography, Sound transmission, Low frequencies, Relaxation, Boric acid, Chemical equilibrium, Ph factor, Absorption, Models, Acoustic resonators, Acoustic measurement

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE