calc_absorption¶
-
echopype.utils.uwa.
calc_absorption
(frequency, distance=1000, temperature=27, salinity=35, pressure=10, pH=8.1, formula_source='AM')¶ Calculate sea absorption in dB/m
Parameters: - frequency : int or numpy array
frequency in Hz
- distance : num
distance in m (FG formula only)
- temperature : num
temperature in deg C
- salinity : num
salinity in ppt
- pressure : num
pressure in dbars
- pH : num
pH of water
- formula_source : str
Source of formula used for calculating sound speed. Default is to use Ainlie and McColm (1998) (
formula_source='AM'
). Another option is to the formula supplied by AZFP (formula_source='AZFP'
). Another option is to use Francois and Garrison (1982) supplied byarlpy
(formula_source='FG'
).
Returns: - Sea absorption [dB/m]