# Fisher & Simmons (1977 table IV) gives 0.52 dB/km for 35 PSU, 5 degC, 500 atm
# (4990 dbar of water)a and 10 kHz
alpha <- swSoundAbsorption(35, 4, 4990, 10e3)
# reproduce part of Fig 8 of Francois and Garrison (1982 Fig 8)
f <- 1e3 * 10^(seq(-1, 3, 0.1)) # in KHz
plot(f / 1000, 1e3 * swSoundAbsorption(f, 35, 10, 0, formulation = "fr"),
xlab = " Freq [kHz]", ylab = " dB/km", type = "l", log = "xy"
)
lines(f / 1000, 1e3 * swSoundAbsorption(f, 0, 10, 0, formulation = "fr"), lty = "dashed")
legend("topleft", lty = c("solid", "dashed"), legend = c("S=35", "S=0"))
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