Time Line for HRP development and use

         1984   HRP development started

February 1986  Frontal Air Sea Interaction Experiment (FASINEX) cruise-
               first actual use of the HRP for science in a study of
               frontal mixing conductued on R/V Endevor cruise 141.

Jul-Dec  1989  Major overhaul of HRP - software conversion to a more
               flexible operating system and exhaustive testing

March    1990  Warm Ring Inertial Critical Layer Experiment (WRINCLE) cruise-
               a study of mixing dynamics in a Gulf Stream Warm Core
               Ring conducted from the R/V Oceanus on cruise 218.

Jul-Aug  1990  An acoustic altimeter was intgrated into the HRP to 
               allow safe approaches to within 10 meters of the

Sept.    1990  Deep water test of altimeter function with HRP on
               R/V Oceanus cruise 223

February 1991  Mixing near Abrupt Topography Experiment (TOPO) cruise- 
               a study of turbulent mixing processes associated with
               an isolated seamount conducted on the R/V New Horizon.

Sept.    1991  Design and implementation of an optical link to the 
               shadowgraph, to be used with the HRP.

March    1992  Site Survey for the North Atlantic Tracer Release
               Experiment (NATRE)  - examined features of ocean mixing
               in a region of "meddy" formation confucted on the 
               R/V Oceanus cruise 250.

May      1993  Enahnced altimeter function to allow more reliability 
               especially over rough and sloping bottom topography.

Nov-Dec  1994  Circulation in the Romanche Fracture Zone (CIRFZ) cruise  -
               Quantified the deep mixing features of flow through
               a fracture zone in the Mid-Atlantic Ridge.  This cruise
               was conducted on a French ship, the R/V le Noroit.

February 1996  Brazil Basin Tracer Release Experiment 1 (BBTRE1) cruise-
               Studied features of the abyssal mixing occurring in the 
               Brazil Basin while aboard the R/V Seward Johnson.
               SF6 tracer was deployed by J.Ledwell's group on this cruise.

March    1997  Brazil Basin Tracer Release Experiment 2 (BBTRE2) cruise-
               Continued the work of the previous cruise, concentrating 
               on how topography effects mixing.  Tracer deployed the previous 
               year was sampled to determine its rate of spreading during this 
               cruise on the R/V Seward Johnson.

May      1998  Topographic Waves over Irregularly Sloping Topography (TWIST)-
               Observed the mixing dynamics over ridges and valleys 
               perpendicular to the continental slope of the Eastern US, 
               while aboard the R/V Oceanus.