From adrian@postoffice.utas.edu.au Tue Mar 1 02:04:26 1994 Received: from tasman.cc.utas.edu.au for adrian@postoffice.utas.edu.au by www.ccl.net (8.6.4/930601.1506) id BAA07227; Tue, 1 Mar 1994 01:21:27 -0500 Received: from localhost (adrian@localhost) by tasman.cc.utas.edu.au (8.6.4/8.6.4) id RAA06622 for CHEMISTRY@ccl.net; Tue, 1 Mar 1994 17:21:22 +1100 Date: Tue, 1 Mar 1994 17:21:22 +1100 From: Adrian Lewis Message-Id: <199403010621.RAA06622@tasman.cc.utas.edu.au> To: CHEMISTRY@ccl.net Subject: Salinity/Conductivity/Density of natural waters Dear list, To change the subject away from quantum computations- Does anyone out there know of any GENERAL equations which will convert between values for water conductivity, density, and salinity? I want to get out salinities in particular. I have a set of equations which convert conductivities to densities, but the one equation I know that converts density to salinity only works at 20C and gives erroneous answers at low salinities. This equation is - Salinity = 1315.7895*density(at 20C) - 1313.4211 I need an equation that will give accurate salinities in the range 2ppt to well over 50ppt (up to 300ppt if possible). It would be good if the equation was temperature dependent, but it isn't an absolute requirement. Depth dependence is not needed. An equation for going directly from conductivity to salinity would also be nice. I am well aware of the equations for the Practical Salinity Scale (1978). These equations have a small problem in that they only work up to 45ppt. They also have a BIG PROBLEM in that they are all given in terms of the conductivity ratios. As all the data I've seen is given as absolute conductivities these equations are useless. Thanks in advance, adrian