How deep do Argo floats go?
The core floats go as deep as 2000 m and the Deep Argo Mission floats go all the way down to 6000 m.
What kind of data are Argo floats collecting from the Southern ocean?
Argo is an international program that calls for the deployment of 3,000 free drifting profiling floats, distributed over the global oceans, which will measure the temperature and salinity in the upper 2,000m of the ocean providing 100,000 T/S profiles and reference velocity measurements per year.
What do Argo floats measure in the world’s ocean currents?
The cylindrical, free-floating devices that stand five feet tall measure temperature and salinity in the ocean. Approximately every 10 days, an Argo float dives about 1.2 miles deep, drifts with the ocean currents, and then surfaces to transmit data in real-time via satellite.
How often do the Argo floats profile?
Argo floats measure both temperature and salinity in the upper 2000 m of the ocean every 10 days. On deployment, the float sinks to a park depth (e.g. 1000 m) and drifts with the ocean currents for 9 days.
How do Argo floats change their depth in the ocean?
External bladder – Roughly the size of a large grapefruit, this bladder is the mechanism by which Argo floats control their buoyancy or depth in the ocean.
What three ocean properties do most Argo floats measure?
Argo is an international program that uses profiling floats to observe temperature, salinity, currents, and, recently, bio-optical properties in the Earth’s oceans; it has been operational since the early 2000s.
Do Argo floats profile the ocean?
What does an Argo float do? The standard Argo float mission is a 10-day cycle, with most of the float’s time spent drifting along with deep ocean currents, followed by taking a series of measurements as it moves back up (profiles) to the ocean surface.
What does Argo measure?
Argo is an international program that measures water properties across the world’s ocean using a fleet of robotic instruments that drift with the ocean currents and move up and down between the surface and a mid-water level. Each instrument (float) spends almost all its life below the surface.
How do profiling floats measure deep ocean currents?
The floats sink to about two kilome- ters below the surface and as they rise, they measure temper- ature and salinity. When they reach the surface again, which is every 10 days or so, they relay conductivity, temperature, and depth measurements and their location via the Argo satellites.
How did Argo make exploring the ocean easier?
Argo provides continuous observations of ocean temperature and salinity versus pressure, from the sea surface to 2000 dbar. The successful installation of the Argo array and its innovative data management system arose opportunistically from the combination of great scientific need and technological innovation.
How do Argo floats change buoyancy?
The battery power available is the main limitation on a float’s operational lifetime. External bladder – Roughly the size of a large grapefruit, this bladder is the mechanism by which Argo floats control their buoyancy or depth in the ocean.
How is mixed-layer depth (MLD) calculated in the Southern Ocean?
Learn more. [1] Argo float profiles of temperature, salinity, and pressure are used to derive the mixed-layer depth (MLD) in the Southern Ocean. MLD is determined from individual profiles using both potential density and potential temperature criteria, and a monthly climatology is derived from individual MLDs using an objective mapping method.
How many Argo float profiles are there in the Southern Ocean?
A monthly climatology of the Southern Ocean (30S-65S, 0-360E) mixed-layer depth (MLD) derived from about 42,000 Argo float profiles obtained from the Global Ocean Data Assimilation Experiment. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors.
What is the Argo float profile used to determine the MLD?
[25] Argo float profiles of temperature, salinity and pressure are used to determine MLDs in the Southern Ocean (30°S–65°S, 0°E–360°E). Here the MLD is determined from individual profiles based on density (Δ ρ = 0.03 kg m −3) and temperature (∣Δ T ∣ = 0.2°C) difference criteria.
How deep can the Argo water column go?
[24] As shown in Figures 6 and 7, only one Argo profile gives a MLD exceeding 400 m in the Atlantic Ocean, and no deep mixed layers are found between 180° and 200°E during our study period. The water column in these regions is strongly stabilized mainly by temperature ( Figures 8a and 8c ).