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function rho = densjmd95(s,t,p); |
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|
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% |
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% DENSJMD95 Density of sea water |
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%========================================================================= |
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% |
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% USAGE: dens = densjmd95(S,Theta,P) |
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% |
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% DESCRIPTION: |
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% Density of Sea Water using Jackett and McDougall 1995 (JAOT 12) |
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% polynomial (modified UNESCO polynomial). |
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% |
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% INPUT: (all must have same dimensions) |
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% S = salinity [psu (PSS-78)] |
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% Theta = potential temperature [degree C (IPTS-68)] |
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% P = pressure [dbar] |
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% (P may have dims 1x1, mx1, 1xn or mxn for S(mxn) ) |
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% |
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% OUTPUT: |
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% dens = density [kg/m^3] |
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% |
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% AUTHOR: Martin Losch 2002-08-09 (mlosch@mit.edu) |
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% |
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% check value |
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% S = 35.5 PSU |
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% Theta = 3 degC |
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% P = 3000 dbar |
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% rho = 1041.83267 kg/m^3 |
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|
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|
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% Jackett and McDougall, 1995, JAOT 12(4), pp. 381-388 |
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|
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% created by mlosch on 2002-08-09 |
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% $Header: $ |
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% $Name: $ |
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|
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%---------------------- |
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% CHECK INPUT ARGUMENTS |
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%---------------------- |
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if nargin ~=3 |
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error('densjmd95.m: Must pass 3 parameters') |
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end |
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if ndims(s) > 2 |
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dims = size(s); |
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dimt = size(t); |
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dimp = size(p); |
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if length(dims) ~= length(dimt) | length(dims) ~= length(dimp) ... |
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length(dimt) ~= length(dimp) |
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error(['for more than two dimensions, S, Theta, and P must have the' ... |
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' same number of dimensions']) |
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else |
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for k=length(dims) |
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if dims(k)~=dimt(k) | dims(k)~=dimp(k) | dimt(k)~=dimp(k) |
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error(['for more than two dimensions, S, Theta, and P must have' ... |
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' the same dimensions']) |
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end |
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end |
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end |
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else |
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% CHECK S,T,P dimensions and verify consistent |
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[ms,ns] = size(s); |
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[mt,nt] = size(t); |
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[mp,np] = size(p); |
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|
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% CHECK THAT S & T HAVE SAME SHAPE |
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if (ms~=mt) | (ns~=nt) |
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error('check_stp: S & T must have same dimensions') |
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end %if |
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|
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% CHECK OPTIONAL SHAPES FOR P |
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if mp==1 & np==1 % P is a scalar. Fill to size of S |
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p = p(1)*ones(ms,ns); |
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elseif np==ns & mp==1 % P is row vector with same cols as S |
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p = p( ones(1,ms), : ); % Copy down each column. |
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elseif mp==ms & np==1 % P is column vector |
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p = p( :, ones(1,ns) ); % Copy across each row |
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elseif mp==ms & np==ns % P is a matrix size(S) |
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% shape ok |
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else |
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error('check_stp: P has wrong dimensions') |
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end %if |
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[mp,np] = size(p); |
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% IF ALL ROW VECTORS ARE PASSED THEN LET US PRESERVE SHAPE ON RETURN. |
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Transpose = 0; |
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if mp == 1 % row vector |
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p = p(:); |
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t = t(:); |
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s = s(:); |
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Transpose = 1; |
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end |
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%***check_stp |
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end |
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|
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% convert pressure to bar |
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p = .1*p; |
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|
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% coefficients nonlinear equation of state in pressure coordinates for |
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% 1. density of fresh water at p = 0 |
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eosJMDCFw(1) = 999.842594; |
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eosJMDCFw(2) = 6.793952e-02; |
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eosJMDCFw(3) = - 9.095290e-03; |
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eosJMDCFw(4) = 1.001685e-04; |
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eosJMDCFw(5) = - 1.120083e-06; |
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eosJMDCFw(6) = 6.536332e-09; |
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% 2. density of sea water at p = 0 |
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eosJMDCSw(1) = 8.244930e-01; |
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eosJMDCSw(2) = - 4.089900e-03; |
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eosJMDCSw(3) = 7.643800e-05 ; |
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eosJMDCSw(4) = - 8.246700e-07; |
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eosJMDCSw(5) = 5.387500e-09; |
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eosJMDCSw(6) = - 5.724660e-03; |
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eosJMDCSw(7) = 1.022700e-04; |
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eosJMDCSw(8) = - 1.654600e-06; |
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eosJMDCSw(9) = 4.831400e-04; |
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|
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t2 = t.*t; |
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t3 = t2.*t; |
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t4 = t3.*t; |
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|
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is = find(s(:) < 0 ); |
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if ~isempty(is) |
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warning('found negative salinity values, reset them to NaN'); |
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s(is) = NaN; |
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end |
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s3o2 = s.*sqrt(s); |
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|
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% density of freshwater at the surface |
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rho = eosJMDCFw(1) ... |
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+ eosJMDCFw(2)*t ... |
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+ eosJMDCFw(3)*t2 ... |
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+ eosJMDCFw(4)*t3 ... |
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+ eosJMDCFw(5)*t4 ... |
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+ eosJMDCFw(6)*t4.*t; |
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% density of sea water at the surface |
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rho = rho ... |
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+ s.*( ... |
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eosJMDCSw(1) ... |
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+ eosJMDCSw(2)*t ... |
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+ eosJMDCSw(3)*t2 ... |
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+ eosJMDCSw(4)*t3 ... |
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+ eosJMDCSw(5)*t4 ... |
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) ... |
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+ s3o2.*( ... |
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eosJMDCSw(6) ... |
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+ eosJMDCSw(7)*t ... |
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+ eosJMDCSw(8)*t2 ... |
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) ... |
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+ eosJMDCSw(9)*s.*s; |
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|
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rho = rho./(1 - p./bulkmodjmd95(s,t,p)); |
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|
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if ndims(s) < 3 & Transpose |
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rho = rho'; |
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end %if |
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|
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return |
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|
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function bulkmod = bulkmodjmd95(s,t,p) |
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%function bulkmod = bulkmodjmd95(s,t,p) |
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|
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dummy = 0; |
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% coefficients in pressure coordinates for |
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% 3. secant bulk modulus K of fresh water at p = 0 |
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eosJMDCKFw(1) = 1.965933e+04; |
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eosJMDCKFw(2) = 1.444304e+02; |
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eosJMDCKFw(3) = - 1.706103e+00; |
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eosJMDCKFw(4) = 9.648704e-03; |
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eosJMDCKFw(5) = - 4.190253e-05; |
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% 4. secant bulk modulus K of sea water at p = 0 |
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eosJMDCKSw(1) = 5.284855e+01; |
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eosJMDCKSw(2) = - 3.101089e-01; |
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eosJMDCKSw(3) = 6.283263e-03; |
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eosJMDCKSw(4) = - 5.084188e-05; |
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eosJMDCKSw(5) = 3.886640e-01; |
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eosJMDCKSw(6) = 9.085835e-03; |
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eosJMDCKSw(7) = - 4.619924e-04; |
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% 5. secant bulk modulus K of sea water at p |
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eosJMDCKP( 1) = 3.186519e+00; |
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eosJMDCKP( 2) = 2.212276e-02; |
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eosJMDCKP( 3) = - 2.984642e-04; |
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eosJMDCKP( 4) = 1.956415e-06; |
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eosJMDCKP( 5) = 6.704388e-03; |
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eosJMDCKP( 6) = - 1.847318e-04; |
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eosJMDCKP( 7) = 2.059331e-07; |
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eosJMDCKP( 8) = 1.480266e-04; |
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eosJMDCKP( 9) = 2.102898e-04; |
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eosJMDCKP(10) = - 1.202016e-05; |
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eosJMDCKP(11) = 1.394680e-07; |
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eosJMDCKP(12) = - 2.040237e-06; |
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eosJMDCKP(13) = 6.128773e-08; |
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eosJMDCKP(14) = 6.207323e-10; |
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|
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t2 = t.*t; |
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t3 = t2.*t; |
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t4 = t3.*t; |
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|
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is = find(s(:) < 0 ); |
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if ~isempty(is) |
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warning('found negative salinity values, reset them to NaN'); |
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s(is) = NaN; |
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end |
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s3o2 = s.*sqrt(s); |
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%p = pressure(i,j,k,bi,bj)*SItoBar |
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p2 = p.*p; |
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% secant bulk modulus of fresh water at the surface |
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bulkmod = eosJMDCKFw(1) ... |
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+ eosJMDCKFw(2)*t ... |
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+ eosJMDCKFw(3)*t2 ... |
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+ eosJMDCKFw(4)*t3 ... |
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+ eosJMDCKFw(5)*t4; |
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% secant bulk modulus of sea water at the surface |
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bulkmod = bulkmod ... |
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+ s.*( eosJMDCKSw(1) ... |
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+ eosJMDCKSw(2)*t ... |
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+ eosJMDCKSw(3)*t2 ... |
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+ eosJMDCKSw(4)*t3 ... |
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) ... |
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+ s3o2.*( eosJMDCKSw(5) ... |
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+ eosJMDCKSw(6)*t ... |
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+ eosJMDCKSw(7)*t2 ... |
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); |
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% secant bulk modulus of sea water at pressure p |
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bulkmod = bulkmod ... |
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+ p.*( eosJMDCKP(1) ... |
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+ eosJMDCKP(2)*t ... |
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+ eosJMDCKP(3)*t2 ... |
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+ eosJMDCKP(4)*t3 ... |
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) ... |
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+ p.*s.*( eosJMDCKP(5) ... |
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+ eosJMDCKP(6)*t ... |
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+ eosJMDCKP(7)*t2 ... |
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) ... |
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+ p.*s3o2*eosJMDCKP(8) ... |
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+ p2.*( eosJMDCKP(9) ... |
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+ eosJMDCKP(10)*t ... |
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+ eosJMDCKP(11)*t2 ... |
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) ... |
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+ p2.*s.*( eosJMDCKP(12) ... |
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+ eosJMDCKP(13)*t ... |
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+ eosJMDCKP(14)*t2 ... |
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); |
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|
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return |
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