|-||buoyancy or float|
|vai sami||sea water|
|masima mai le sami||sea salt|
What is an Argo Float?
Argo Floats are robots that float at different depths in the sea collecting information. Every 10 days they float to the surface and send their data to a satellite.
An Argo Float is a steel float weighing about 25kg, with instruments inside. An Argo float is able to do three things:
An Argo Float:
- is able to change its buoyancy so it floats at different depths
- is able to take measurements of sea water
- is able to send information to a satellite.
Argo Float buoyancy
By changing its own buoyancy, an Argo Float is able to float at different depths. Every 10 days the Argo Float returns to the surface to send information to satellites. This information is called a 'profile'.
How do Argo Floats measure the ocean?
A fun and quirky YouTube video animation that explains what an Argo float is, how it operates and how the data helps us understand ocean circulation and climate.
While the Argo Float is underwater it measures three things about the ocean:
An Argo Float measures:
- salinity (amount of salt in the water) measures in parts per thousand
- temperature in degrees Centigrade (°C)
- pressure in decibars (db)
Note that 1decibar (db) of pressure is equal to about 1 metre of depth. So 1,000db is about 1,000m below the sea surface.
Argo information to satellites
While the Argo Float is on the sea surface it sends its information to a satellite.
- temperature and depth
- salinity and depth
Regular Argo Floats
Regular Argo Floats are designed to be strong enough to descend to 2,000m below the surface of the sea. At a depth below 2,600m they will crush and be destroyed.
Deep Argo Floats
Deep Argo Floats are designed to go down to depths as far as 5,000m. Deep Argo floats are glass spheres not metal cylinders.
tētē buoyancy or float vai tahi sea water moana ocean masima sea salt - pressure
Cook Islands Māori keywords
hili buoyancy or float vala tahi sea water moana ocean masima tahi sea salt peehi, fofota pressure