integrating to get the total volumetric transport in Sv

I'm a little lost on how to integrate the Sverdrup transport to get the total volumetric transport. the answer should be

The zonal wind stress contribution to the total Sverdrup transport: -22.5 Sv (negative sign means southward)

meridional wind stress contribution to the total Sverdrup transport: -3.4 Sv

Both zonal and meridional wind stress contribution: -25.9 Sv.

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% sverdrup.m

% Reads and plots wind stress data in the subtropical North Atlantic Ocean.

% The wind stress data are defined at 2-degree intervals in longitude and

% latitude. Originally coded by Raymond G. Najjar 2004

% Modified by PRB in 2005, 2007

clear

% Read in monthly wind stress (dyne cm^2) fields at 25N and 27N in the Atlantic

load taux25n.txt

load tauy25n.txt

load taux27n.txt

load tauy27n.txt

% Compute annual averages and convert to N m^-2. (dyne is a cgs unit for force = g*cm s^-2)

tx25 = mean(taux25n)*0.1;

ty25 = mean(tauy25n)*0.1;

tx27 = mean(taux27n)*0.1;

ty27 = mean(tauy27n)*0.1;

% The wind stress data extend from 81W to 15W; that's from the east coast of Florida

% to the northwest coast of Africa.

% Plot the stresses as a function of distance in km from Florida.

imax = size(tx25,2);

i = 1:imax;

xkm = (i-1)*222*cos(26.*pi/180);

yo = i*0;

% Part I: The integrated Ekman and Sverdrup transports

% Computing Ekman Transport

omega = (7.29).*10.^-5;

f = 2.*omega.*sin((26./180).*3.14);

tx26 = (tx25+tx27);

ty26 = (ty25+ty27);

Mx26 = (ty26./f);

My26 = (-tx26./f);

% Computing wind stress curl and Sverdrup Transport

dx = 111.*cos((26./180).*3.14);

dy = 111.*1000;

a = 6.4.*10.^6;

B = (1./a).*2.*omega.*cos(26);

for i =1:imax-1

curl(i+1) = (1./B).*((ty26(i)-ty26(i))/(2.*dx) - (tx27(i)-tx25(i))/(2.*dy));

end

figure(1)

subplot (2,1,1)

plot(xkm,tx25,'-b',xkm,ty25,'-r',xkm,tx27,'-.b',xkm,ty27,'-.r',xkm,yo,'k')

legend('\tau_x at 25\circN','\tau_y at 25\circN','\tau_x at 27\circN','\tau_y at 27\circN')

title('Annual Mean Wind Stress at 25\circN and 27\circN in the Atlantic')

xlabel('distance east of Florida (km)')

ylabel('stress (N m^-^2)')

subplot (2,1,2)

plot(xkm,My26,'-.k',xkm,curl,'k')

title('Ekman and Sverdrup mass transports at 26°N');

xlabel('distance east of Florida (km)');

ylabel('transport (kg/ms)');