Janus Helmholtz sources at 400 and 250 Hz, while E will be a erato transceiver (WRC). All those moorings will have various other instrumentation, including upward looking ADCP on S1, E, and S2, currentmeters, temperature and salinity sensors, and sound sources for the rafos-type vcm floats. The nominal separation of the moorings vary from 300 to 600 km.
Lagrangian instrumentation
A wide variety of instrumentation will include:
― 24 mixed layer drifters with 150m or 200m long thermistor chains and wind measurements (MARISONDE).
― 5 SVP surface drifters, either with salinity and air pressure or with acoustic wind measurements and air pressure (possible contribution of Meteo France). These drifters follow closely the current at 15m.
― 5 CARIOCA drifters. These drifters, drogued at 15 m, measure the wind magnitude, air temperature, as well as surface water CO2 partial pressure and fluorescence.
― 10 SURDRIFT surface floats anchored at 300 or 400m. The current-following capability of the floats is generally quite good, but maybe not at the 1 cm/s level wished for. The deep drogues have been known to last for 3 to 6 months.
― 15 PROVOR floats at 400m (or at a deeper level). PROVOR is the French designed autonomous profiling float, with profiles taken every 10 days. Most of these will be equipped with temperature and salinity.
― 20 MARVOR floats at 400 m. The floats are acoustically tracked, and report their location as they surface periodically. These floats, known to live up to 5 years, will mostly be deployed in September 2000 with some deployed in January 2001.
― 10 Rafos floats at 400 m (surfacing after one year in the water) deployed in September 2000.
― 35 VCM RAFOS floats at two depths in the upper 500 meters for a 9 months to one year mission. These floats record the vertical velocity of the flow past the float, as well as temperature and pressure.
Analysis of satellite data
In addition, space-related data and analyses will be provided to the experiment (altimetric products; scatterometer winds, if available; surface temperature; radiative fluxes; and ocean color).
Oceanographic cruises
Several cruises are planned. A preliminary survey will be carried in the fall 2000, at the time of mooring deployments. About 60 CTD stations, with L-ADCP, complemented by an XBT survey). This cruise will release several of the provor and vcm floats, and conduct the SF6 tracer release. Three cruises are proposed in 2001, each with two ships: in January-February 2001 (winter conditions, pre-subduction, pre-bloom), in April 2001 (subduction-bloom) and at the end of summer - fall 2001 (pre-conditioning of the winter export of dissolved organic matter).
During the first leg of the three cruises in 2001 (roughly 20 days), a meso-scale hydrographic survey will be carried (resolution 55 km).
The second part of the cruises (on the order of 20 days) will include repeated Towyo profiles (CTD/fluorescence profiles to 800 meters) together with more specific biological - production surveys by R. V. 1. This will include JGOFS time series lasting
