gsw 3.0.2

python gsw
==========

[](http://badge.fury.io/py/gsw)
[](https://travis-ci.org/ocefpaf/python-gsw)
[](https://crate.io/packages/gsw/)


Python implementation of the Thermodynamic Equation Of Seawater - 2010 (TEOS-10)
--------------------------------------------------------------------------------

For more information go to:
http://www.teos-10.org/


gsw vs. csiro
-------------

This table shows some function names in the gibbs library and the corresponding function names in the csiro library.

| **Variable** | **SeaWater (EOS 80)** | **Gibbs SeaWater (GSW TEOS 10)** |
|:---------------------------------------------------:|:-----------------------------------------------:|:-----------------------------------------------------:|
| Absolute Salinity | NA | gsw.SA_from_SP(SP,p,long,lat) |
| Conservative Temperature | NA | gsw.CT_from_t(SA,t,p) |
| density (i.e. in situ density) | sw.dens(SP,t,p) | gsw.rho_CT(SA,CT,p), or gsw.rho(SA,t,p) |
| potential density | sw.pden(SP,t,p,pr) | gsw.rho_CT(SA,CT,pr) |
| potential temperature | sw.ptmp(SP,t,p,pr) | gsw.pt_from_t(SA,t,p,pr) |
| $\sigma_0$, using $\theta_o$ = sw.ptmp(SP,t,p,0) | sw.dens(SP, $\theta_o$, 0) -1000 kg m$^{-3}$ | gsw.sigma0_CT(SA,CT) |
| $\sigma_2$, using $\theta_2$ = sw.ptmp(SP,t,p,2000) | sw.dens(SP,$\theta_2$, 2000) -1000 kg m$^{-3}$ | gsw.sigma2_CT(SA,CT) |
| $\sigma_4$, using $\theta_4$ = sw.ptmp(SP,t,p,2000) | sw.dens(SP,$\theta_4$, 4000) -1000 kg m$^{-3}$ | gsw.sigma2_CT(SA,CT) |
| specific volume anomaly | sw.svan(SP,t,p) | gsw.specvol_anom_CT(SA,CT,p) |
| dynamic height anomaly | -sw.gpan(SP,t,p) | gsw.geo_strf_dyn_height(SA,CT,p,delta_p,interp_style) |
| geostrophic velocity | sw.gvel(ga,lat,long) | gsw.geostrophic_velocity(geo_str,long,lat,p) |
| N$^2$ | sw.bfrq(SP,t,p,lat) | gsw.Nsquared(SA,CT,p,lat) |
| pressure from height (SW uses depth, not height) | sw.pres(-z,lat) | gsw.p_from_z(z,lat) |
| height from pressure (SW outputs depth, not height) | z = -sw.dpth(p,lat) | gsw.z_from_p(p,lat) |
| in situ temperature from pt | sw.temp(SP,pt,p,pr) | gsw.pt_from_t(SA,pt,pr,p) |
| sound speed | sw.svel(SP,t,p) | gsw.sound_speed(SA,t,p) |
| isobaric heat capacity | sw.cp(SP,t,p) | gsw.cp(SA,t,p) |
| adiabatic lapse rate* | sw.adtg(SP,t,p) | gsw.adiabatic_lapse_rate(SA,t,p) |
| SP from cndr, (PSS 78) | sw.salt(cndr,t,p) | gsw.SP_from_cndr(cndr,t,p) |
| cndr from SP, (PSS 78) | sw.cndr(SP,t,p) | gsw.cndr_from_SP(SP,t,p) |
| distance | sw.dist(lat,long,units) | gsw.distance(long,lat,p) |
| gravitational acceleration | sw.g(lat,z) | gsw.grav(lat,p) |
| Coriolis parameter | sw.f(lat) | gsw.f(lat) |

Note that the SW and GSW functions output the adiabatic lapse rate in different units, being K (dbar)$^{-1}$ and K Pa$^{-1}$
respectively.


Authors
-------
* Bjørn Ådlandsvik
* Eric Firing
* Filipe Fernandes

Thanks
------

* Bjørn Ådlandsvik - Testing unit and several bug fixes.
* Eric Firing - Support for masked arrays, re-write of _delta_SA.
* Trevor J. McDougall (and all of SCOR/IAPSO WG127) for making available the Matlab version of this software.

Acknowledgments
---------------

* SCOR/IAPSO WG127.


version 3.0.2
==============
* New repository with TEOS10 code (version 3 only).