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.