The subduction experiment : cruise report R/V Knorr : cruise number 138 leg XV : subduction 3 mooring recovery cruise, 13-30 June 1993

Funding provided by the Office of Naval Research underContract No. N00014-90-J-1490.

Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find theirway into the upper thermocline. The subduction process and its underlying mechanisms were studied though a combination ofEulerian and Langrangian measurements of velocity, measurements of tracer distributions and hydrographic properties and modeling.An array of five surface moorings carrying meteorological and oceanographic instrumentation were deployed for a period oftwo years beginning in June 1991 as part of an Office of Naval Research (ONR) funded Subduction experiment. Three eight monthdeployments were planned. The moorings were deployed at 18°N 34°W, 18°N 22°W, 25.5°N 29°W, 33°N 22°W and 33°N 34°W.A Vector Averaging Wind Recorder (VAWR) and an Improved Meteorological Recorder (IMET) collected wind speed andwind direction, sea surface temperature, air temperature, short wave radiation, barometric pressure and relative humidity. The IMETalso measured precipitation. The moorings were heavily instrumented below the surface with Vector Measuring Current Meters(VMCM) and single point temperature recorders.Expendable bathythermograph (XBT) data were collected and meteorological observations were made while transmittingbetween mooring locations.This report describes the work that took place during R/V Knorr cruise number 138 leg XV which was the fourth scheduledSubduction mooring cruise. During this cruise the moorings previously deployed for a third and final eight month period wererecovered. This report includes a description of the moorings and instrumentation that were recovered, has information about theunderway measurements (XBT and meteorological observations) that were made including plots of the data, and presents a chronologyof the cruise events.