Accession Number:

ADA393065

Title:

North Brazil Current Rings Experiment: Mooring S1 Data Report, November 1998 - June 2000

Descriptive Note:

Technical rept.

Corporate Author:

WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Report Date:

2001-06-01

Pagination or Media Count:

53.0

Abstract:

Nineteen months of temperature and salinity data were recovered from North Brazil Current NBC Rings Experiment Mooring S1. The mooring, located east of Barbados at 13 deg 00N, 57 deg 53W between November 1998 and June 2000, consisted of a vertical array of five temperatureconductivity recorders, five temperature recorders, one 150 kHz acoustic Doppler current profiler ADCP, and one 260 Hz RAFOS sound source. This instrumentation was distributed over a depth interval 500-1100m coincident with the low-salinity core of Antarctic Intermediate Water. Due-to low concentration of scattering particles at 1000 m, the ADCP failed to return useful velocity data. Heading, pitch, and roll data were successfully recorded, however, and provide coarse measurement of current intensity. Four anomalously low temperature, low salinity, and inferred high-velocity events appear toward the end of the record. The temperature and salinity fluctuations observed during these events are most likely due to a combination of vertical instrument excursions due to current-induced mooring tilt and advection of anomalous NBC ring-core water past the mooring site. Anomalous conditions persist for a period of 2-3 weeks and appear, based on simultaneous surface drifter trajectories and satellite ocean color observations, to be associated with the passage of NBC Rings near Barbados.

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE