Calculation of the Absorption Loss Profile and Average in Seawater

The absorption loss of the depth direction in the sea  is calculated by various equations.

The following CSV files should be prepared before calculating.

Depth (m) ,Temperature (deg C), Salinity (ppt)

But the file name is arbitrary, and the column number is not limited.

At first input frequency(kHz) , PH and propagation range (km) into the column.

Push the upload / calculate button after choosing your CSV file next.

The following calculation result is output on a screen with a CSV( D , T , S, Absorption Loss ) file.

The mean value of the absorption loss is displayed at the end of the file.


The  CSV file of absorption is used by EXCEL or other graphical software by copy and paste. The sample files are prepared.

Please input a necessary value into the following columns.

Frequency (kHz)

PH    ( Input "8.1" when there are not data. )

Please choose which equation you useH(You must confirm a range of validity of each equations before calculating.)

Schulkin & Marsh
Fisher & Simmons
Francois & Garrison
Ainslie & McColm

Please choose a your CSV (D,T,S) fileF

Please describe reference site ( when you use the result of the calculation by this site.