As we approach their hut, following the pink flags.

  The ride in a Mattrack is very bumpy.

  Lars and Sean trying to fix the anemometer.  The tank on the rear is for fuel for the generator.

  Linnea supervising Lars and Sean trying to fix the anemometer.

  With the sun dimly visible to the North.  The pole on the right is for the ozone inlet.

  The ozone inlet.

  Ozone and weather instruments inside the hut.

  The mast, to which the sonic anemometer and another ozone sensor will be mounted, for flux measurements.

  With the anemometer installed.  As you can tell, it is an excellent isolated location for measurements.

  A faint halo was visible around the sun.

  It was not that cold, but my breath was condensing.

  Approaching McMurdo on the way back.

  McMurdo.  The building on the far left is where we launch our balloons.