Perpetual Ocean by NASA [video](youtu.be)
youtu.be
Perpetual Ocean by NASA [video]
http://youtu.be/WEe1bVjORN4
13 comments
This has a remarkable similarity to Starry Night.
anyone knows if the data is available in a format that could be used to make a WebGL viewer out of it? would be nice to be able to spin the globe around.
Great video! Here's a nooby question though, why don't the oceans settle down? Is it to do with the moon? And does this mean oceans on planets without moons are perfectly calm?
The moon does have a effect on Earth's oceans, but the biggest reason why oceans are active, is the variation of temperature both in the atmosphere and in the water(This also creates a variation on pressure). The difference on air pressures, will create wind, which in turn create waves.
Ocean currents exist because different places on Earth are at a different temperature, and therefore the water will feel a pressure force to go elsewhere.
This is quite a generalization, but meteorology is a complex science, and there is much to dig in.
Ocean currents exist because different places on Earth are at a different temperature, and therefore the water will feel a pressure force to go elsewhere.
This is quite a generalization, but meteorology is a complex science, and there is much to dig in.
Sure, but you didn't completely answer his question: the reason the oceans don't settle down is because the sun continuously drives these temperature gradients.
Some currents, like the Equatorial Counter Current (NECC) (which runs West to East just North of the equator) are actually wind-driven surface currents.
Yes it's about the wind (geostrophic currents) and temperature, but mainly because the earth doesn't stop rotating! The resultant forces are different depending on the latitude and depth. Note the dramatic differences on either side of the equator.
The most famous of these uneven forces is of course the Coriolis effect.
The most famous of these uneven forces is of course the Coriolis effect.
It'd be neat to see a version of this similar to the Windmap posted earlier.
http://hint.fm/wind/
http://hint.fm/wind/
This is very detailed, how do they make these measurements? I assume it is based on measurement but interpolated using simulation of some kind.
It's a visualization of the data produced by the ECCO2 project (http://ecco2.org/), which feeds all available measurements of temperature, current, etc. into an MITgcm fluid-circulation simulation model (http://mitgcm.org/), which then estimates the most likely circulation.
Lots and lots of physical measurements. One large scale example is the Global Drifter Program. The US contribution is largely funded by NOAA.
http://www.aoml.noaa.gov/phod/dac/index.php
The array is usually maintained at above 1000 discrete instruments deployed by various cargo ships, and research vessels globally. These measure ocean currents centered at 15m depth, which helps eliminate bias from surface currents driven by winds. These drifters also measure surface temperature some with sea level air pressure.
http://www.aoml.noaa.gov/phod/dac/index.php
The array is usually maintained at above 1000 discrete instruments deployed by various cargo ships, and research vessels globally. These measure ocean currents centered at 15m depth, which helps eliminate bias from surface currents driven by winds. These drifters also measure surface temperature some with sea level air pressure.