Ocean Circulation Group
USF College of Marine Science
















The nowcast/forecast system and other analyses/data are research products under development. No warranty is made, expressed or implied, regarding accuracy, or regarding the suitability for any particular application. All rights reserved University of South Florida, Ocean Circulation Group. Copyright University of South Florida 2010

Tropical Instability Wave Experiment

Project Information :

The Tropical Instability Wave Expreiment (TIWE) is a multi- institutional, multi-investigator program aimed at furthering our understanding of planetary waves, resulting from surface current instability near the equator, which affect the upper ocean balances of mass, momentum, and heat. The Tropical Instability Wave Experiment (TIWE) consists of several elements, one of which was an array of five subsurface moored acoustic Doppler current profilers (ADCPs), centered on the equator at 140°E.

Field Program :
The TIWE field program consisted of several elements, including : 1) an array of subsurface acoustic Doppler current profiliers (ADCPs) centered on the equator at 140°W, 2) an array of subsurface moored mechanical profilers for currents, temperature, and salinity centered upon 2°N, 140°W, 3) shipboard hydrographic measurements to map out the property fields associated with these waves and 4) a remote sensing component mapping surface expressions by satellite. The field work associated with this project was initiated in May 1990 and lasted for approximately one year. The University of South Florida (USF), College of Marine Science contribution to this field program is the deployment of five subsurface moored acoustic Doppler current profilers (ADCPs), centered on the equator at 140°E in a diamond shaped array.

Buoy positions and mooring diagrams of USF TIWE
TIWE buoy positions TIWE mooring diagram

View Contour plots of data from TIWE filtered to remove oscillations with time scales shorter than 10 days
1°N, 140°W (TIW5)
0°, 142°W (TIW1) 0°, 140°W (TIW4) 0°, 138°W (TIW3)
1°S, 140°W (TIW2)

University of South Florida