Endless Loop: Earth's Water Cycle

  • Released Friday, October 9, 2009

For circulating energy, for distributing essential chemistry, and as a fundamental requirement for most biological processes, water defines Earth's dynamic identity. The more than seventy percent of our planet covered by water is in many ways the reason life has survived and thrived for so long.

A simple trip to the ocean's edge highlights how water constantly moves. But water sloshing back in forth in ocean basins only begins to describe the complex processes of its circulation on Earth.

NASA takes the water cycle as not merely an academic exercise but as a vital area for exploration. Satellites can examine aspects of the global water cycle that in situ measurements and observations can only dream about seeing. The TRMM spacecraft is the world's most advanced precipitation measuring system to date, gathering vital information about tropical precipitation and other features every day. Other sensors, like the AMSR and AIRS instruments on the AQUA spacecraft take profiles of the planet's atmosphere, examine water vapor concentrations and distribution, among other things.

A number of instruments look at water at or below the surface. MODIS makes sea surface temperature measurements that provide essential information about how oceans work and how they're changing over time. GRACE keeps track of elusive, yet massive, quantities of water both underground and in the oceans by making precise gravitational measurements. And the planned Aquarius mission, scheduled for launch in just a few years, will make unprecedented measurements of ocean salinity, a vital characteristic for describing a wide variety of phenomena, from life to physical processes that govern global circulation patterns.

Precipitation leads to run-off, flowing down to rivers, lakes, and oceans; evaporation and transpiration send water back into the sky.

Precipitation leads to run-off, flowing down to rivers, lakes, and oceans; evaporation and transpiration send water back into the sky.

(01:13 / Audio) Narrated, with music. In this schematic animation we break down the water cycle's complex processes into tangible pieces.

(06:30 / Audio) Narrated, with music. Water plays a fundamental role in the regulation of climate on Earth. Here we take a closer look at its route, its process, and its essential character.

(00:19 / No Audio) As ocean temperatures fluctuate and circulate, water evaporates at different rates. Sea surface temperature plays a big role in the water cycle.

(00:19 / No Audio) Rain falls on Earth everyday. This visualization shows measurable quantities of precipitation falling on Earth, red zones indicating heavier concentrations.

(00:19 / No Audio) This visualization shows how water circulates above the surface of the planet in the form of water vapor.

(00:19 / No Audio) Data gathered from space shows a strong day-night signal, with sunlight pulling water up into the sky.



Credits

Please give credit for this item to:
NASA's Goddard Space Flight Center Scientific Visualization Studio

Release date

This page was originally published on Friday, October 9, 2009.
This page was last updated on Wednesday, May 3, 2023 at 1:54 PM EDT.