Profiling Floats for Ocean Data Collection

Tender description

Framework Agreement for supply of profiling floats for ocean data collection, covering the following lots: Lot 1: Standard Argo with Iridium Communications Lot 2: Iridium Floats with Bio-Geochemical Sensors Lot 1: Standard Argo with Iridium Communications The floats must carry proven temperature, salinity and pressure sensors that meet the following standards. The temperatures are accurate to ±0.002°C and pressures are accurate to ±2.4dbar. For salinity, the data delivered in real time are sometimes affected by sensor drift, for many floats this drift is small and the uncorrected salinities are accurate to ±0.01 psu. (At a later stage, salinities are checked by comparing older floats with newly deployed instruments and ship-based data, where salinity drifts may be corrected for.) The data must be transmitted with at least the following resolution 0.001 °C in temperature, 0.001 in salinity and 0.1 dbar in pressure. Lot 2: Iridium Floats with Bio-Geochemical Sensors Bio-geochemical floats must be capable of meeting the core (standard) Argo requirements, therefore the floats must carry a proven temperature, salinity and pressure sensor that meets the following standards. The temperatures are accurate to ±0.002°C and pressures are accurate to ±2.4dbar. For salinity, the data delivered in real time are sometimes affected by sensor drift, for many floats this drift is small and the uncorrected salinities are accurate to ±0.01 psu. (At a later stage, salinities are checked by comparing older floats with newly deployed instruments and ship-based data, where salinity drift may be corrected for.) The data must be transmitted with at least the following resolution 0.001 °C in temperature, 0.001 in salinity and 0.1 dbar in pressure.