title: Matplotlib scatter intensity
body: <p>I have created a global contour for d18O with a specified range and colorbar.</p>
  
  <pre><code>lon = np.arange(-180.0,180.0,1)
  lat = np.arange(-90.0,90.0,1)
  m1 = Basemap(projection='mill',llcrnrlat=-90,urcrnrlat=90,
               llcrnrlon=-180,urcrnrlon=180,resolution='c')
  x,y = m1(*np.meshgrid(lon, lat))
  colors=[-5.6,-4.4,-3.6,-3.2,-2.8,-2.4,-2.0,-1.7,-1.4,-1.1,-.8,-.5,
          -.2,.2,.4,.6,.8,1.0,1.3,1.6,2.0,2.4,2.8]
  
  m1.contourf(x, y, d18o_fal,colors) #d18o_fal is a 360x180 matrix of d18O values.
  m1.drawcoastlines()
  m1.fillcontinents()
  m1.drawmapboundary()
  plt.title(Fall+' Calculated Surface $\delta^{18}$O Seawater')
  cbar = plt.colorbar(orientation='horizontal', extend='both')
  cbar.ax.set_xlabel('O18/O16 permilli')
  plt.show()
  </code></pre>
  
  <p>I am trying to plot a scatterplot of the arctic with the color intensity equal to the intensity of d18O (Figure a). The points are from long, lat, and d18o.</p>
  
  <p>Much like this:
  <a href="http://imgur.com/uExeiYB" rel="nofollow">http://imgur.com/uExeiYB</a>
  (Figure 1A)</p>
  
  <p>Sorry I can't post pictures yet!</p>