How to plot a profile of temperature and potential density with depth.

Hello, as part of my project I'm trying to plot multiple x variables (temp, salinity, pdensity etc.) on one y variable (depth). I'm new to matlab and haven't had much luck so far. I can get all my data looking good using subplot however it would save space and look more effective to have multiple variables on one graph.

An additional problem is because I am not defining the axis myself I am using someone elses data with predefined axis to make these graphs.

thanks in advance.

     subplot(1,4,1)
    plot(chl,z,'g')
    axis([0 1.5 -100 0])
    xlabel({'Chlorophyll concn.','(mg m^{-3})'},'fontsize',14)
    ylabel('z (m)','fontsize',14)
    set(gca,'FontSize',12)
    set(findall(gca, 'Type', 'Line'),'LineWidth',3.5);

    subplot(1,4,2)
    plot(NO3,z,'b')
    axis([0 8 -100 0])
    xlabel({'Nitrate concn.','(mmol m^{-3})'},'fontsize',14)
    ylabel('z (m)','fontsize',14)
    set(gca,'FontSize',12)
    set(findall(gca, 'Type', 'Line'),'LineWidth',3.5);
    set(gca,'XTick',0:2:10);

subplot(1,4,3)
plot(temp,z,'r')
axis([9 15 -100 0])
xlabel({'Temperature','(\circC)'},'fontsize',14)
ylabel('z (m)','fontsize',14)
set(gca,'FontSize',12)
set(findall(gca, 'Type', 'Line'),'LineWidth',3.5);

subplot(1,4,4)
plot(pden,z,'k')
axis([1.0252e+03 1.0264e+03 -100 0])
xlabel({'Potential density','(\rho\theta)'},'fontsize',14)
ylabel('z (m)','fontsize',14)
set(gca,'FontSize',12)
set(findall(gca, 'Type', 'Line'),'LineWidth',3.5);
set(gca,'XTick',1025.2:0.6:1026.4);
  end