We have decided to squeeze the injection in while we have some good weather. The weather promises to deteriorate starting Wednewday morning, so we have about 36 hours between the time we arrive on site tomorrow around dinner time and Wednesday around breakfast. The injection must go flawlessly for us to get all the tracer injected in this time. We will increase the flow rate and turn the sled around quickly between the two casts that it will take if nothing breaks. So the schedule is something like the attached. Please note that the positions will be revised slightly as satellite data come in---tomorrow by noon.

We will do the remainder of the CTD line and floats after the injection. We will deploy the last 2 shearmeters and sets of RAFOS floats during sampling of the tracer patch, after the CTDs are done.

Three RAFOS floats, ready for launch. The glass tubes can withstand pressures to about 20 atmospheres, or about 2000 meters depth in the ocean. There is a device at the far end which is compressible and gives the floats about the same compressibility as seawater so that the floats move up and down roughly with the water they are following. This device is dropped when the time comes for the float to surface. The scrolled scale inside the glass tube is used during ballasting. The electronics in the metallic enclosure near the end enable the floats to record sound arrival times and the pressure and temperature of the water as they travel, and also enable these data to be transmitted to land via a satellite connection when the float is on the surface.

Our plan when we get back is to finish the CTD/XBT line and float release between 60 S and 58 S. We will have to forgo sampling any farther south due to the unanticipated trip to Punta Arenas and back, but the essential goals of the cruise can still be met: to deploy the sound sources (done), the RAFOS floats (half-done) and our tracer (still to be done). We also have some special floats to deploy, which will be described later, and we would like to document the vertical distribution of the tracer shortly after release. Our CTD/XBT data and the satellite altimetry should tell us where, relative to the fronts and mean sea surface elevation, we will have placed the floats and the tracer.