North Atlantic Tracer Release Experiment (NATRE)
The HRP was used to perform a survey of the potential tracer release
area to determine the best location for injection. A 10 station by 10 station
grid, 10 kilometers on a side was occupied, with the dives terminated at
2000 meters. The tracer release site was selected on the basis of the data
collected in these profiles. The station map (above) shows a cluster of
profiles done at the injection site to further quanitfy the likely dynamics
before injection. During the 24 day cruise on the R/V
Oceanus, 155 profiles were completed.
Also noteworthy during the experiment was the completion of the first
ever microstructure profiles to 4000 meters. These were done after the
survey, off the African coast near 24.5 N, 20.25 W. The HRP is well suited
to obtaining deep microstructure measurements, and completed these without
The publications resulting from this experiment are:
Montgomery,E.T., R.W.Schmitt, J.M.Toole and K.L.Polzin, 1992. Site survey
results for the North Atlantic Tracer Release Experiment. EOS, Transactions,
Americian Geophysical Union, 73(43), p 321.
Montgomery, E. T. and R. W. Schmitt,1993. Cruise Report - Oceanus 250,
leg 4. High Resolution Profiler Survey for the North Atlantic Tracer Release
Experiment: (NATRE), March 25 - April 24, 1992. Woods Hole Oceanographic
Institution Technical Report 93-39, 41 pp.
Toole, J. M., K. L. Polzin, and R. W. Schmitt, 1994. Estimates of diapycnal
mixing in the abyssal ocean. Science, 264,
Polzin, K., J. M. Toole, and R. W. Schmitt, 1995. Finescale parameterizations
of turbulent dissipation. Journal of Physical Oceanography,
25 (3), 306--328.
Polzin, K. L., 1996. Statistics of the Richardson Number: mixing
models and finestructure. Journal of Physical Oceanography,
Schmitt, R. W., 1999. Spice and the Demon. Science,
283 (5401), 498-499.
St. Laurent, L. and R. W. Schmitt, 1999. The contribution of salt fingers
to vertical mixing in the North Atlantic Tracer Release Experiment. Journal
of Physical Oceanography, 29, (7), 1404-1424.
Polzin, K. L., E. Kunze, J. M. Toole and R. W. Schmitt, 2000. The partitioning
of small-scale energy into internal waves and vortices: Implications for
horizontal mixing, Journal of Physical Oceanography, submitted.
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