First Derivatives of Entropy
First Derivatives of Entropy
gsw_entropy_first_derivatives(SA, CT)
SA |
Absolute Salinity [ g/kg ] |
CT |
Conservative Temperature [ degC ] |
The present R function works with a wrapper to a C function contained within the GSW-C system (Version 3.05-4 dated 2017-08-07, available at https://github.com/TEOS-10/GSW-C, as git commit '5b4d959e54031f9e972f3e863f63e67fa4f5bfec'), which stems from the GSW-Fortran system (https://github.com/TEOS-10/GSW-Fortran) which in turn stems from the GSW-Matlab system (https://github.com/TEOS-10/GSW-Matlab). Consult http://www.teos-10.org to learn more about these software systems, their authorships, and the science behind it all.
a list containing eta_SA [ (J/(kg*degC) / (g/kg) ],
the derivative of entropy wrt Absolute Salinity, and eta_CT [ (J/(kg*degC^2) ],
the derivative of entropy wrt Conservative Temperature.
Other things related to entropy: gsw_CT_from_entropy,
gsw_entropy_from_pt,
gsw_entropy_from_t,
gsw_entropy_ice,
gsw_pt_from_entropy
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
CT <- c(28.8099, 28.4392, 22.7862, 10.2262, 6.8272, 4.3236)
d <- gsw_entropy_first_derivatives(SA, CT)
expect_equal(d$eta_SA, c(-0.263286800711655, -0.263977276574528, -0.255367497912925,
-0.238066586439561, -0.234438260606436, -0.232820684341694))
expect_equal(d$eta_CT, c(13.221031210083824, 13.236911191313675, 13.489004628681361,
14.086599016583795, 14.257729576432077, 14.386429945649411))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.