How does the ocean work?
The ocean works as a set of interconnected physical, chemical, and geological systems — currents that move heat, chemistry that cycles carbon and oxygen, depth zones defined by light and pressure, and a dynamic seafloor — that together support marine life and help regulate Earth's climate.
Why does understanding how the ocean works matter?
Because the ocean drives weather, stores vast amounts of heat and carbon, and supports nearly all life on Earth. Understanding its systems helps scientists forecast change and helps communities prepare for it.
Each of these systems has its own story.
Ocean circulation moves water and heat through wind-driven currents and a deep global conveyor. The ocean's cycles — carbon, water, and the biological carbon pump — move matter and energy through the sea. Ocean chemistry determines whether marine life can thrive. The ocean zones stack from the sunlit surface to the crushing hadal trenches, while the seafloor and below, the ocean-atmosphere connection, coastal shorelines, and the frozen ocean each add another moving part.
These systems are connected, and that is what makes them matter. The same currents that warm coastlines also drive weather; the same chemistry that feeds phytoplankton also buffers the climate. WHOI scientists and engineers study these processes together — with research vessels, moorings, and vehicles like HOV Alvin and ROV Jason — turning observations into the knowledge people need to navigate a changing ocean.
Understanding how the ocean works is foundational to understanding life on this planet and to the discipline of oceanography. Get to know the big systems of the ocean: its cycles, circulation, zones, and connection to the atmosphere. Learn about ocean chemistry, life and landscapes on the seafloor, plate movements, shorelines, and icy regions.
More topics like this
AMOC—The Atlantic Ocean’s conveyor belt
The ocean's conveyor-like global circulation influences today's climate system.
Biogeochemistry
Biogeochemistry studies the cycles of crucial elements, such as carbon and nitrogen, and their interactions with other substances and organisms as they move through Earth's atmosphere, hydrosphere, biosphere, and lithosphere.
Biological carbon pump
Every day, microscopic phytoplankton pull carbon dioxide from surface waters and send it sinking into the deep sea—where the ocean's biological carbon pump can lock it away for hundreds to thousands of years, quietly shaping Earth's climate.
Changing shorelines & erosion
Waves, currents, wind, storms, and tides form complex interactions over time to cause erosion along some stretches of shoreline and growth in others.
Hydrothermal vents
In the sunless deep, hydrothermal vents gush superheated, mineral-rich fluid from the seafloor, building towering mineral chimneys. Around them thrives one of Earth's strangest ecosystems—tubeworms, shrimp, and microbes that live on chemistry instead of sunlight, powered by the planet's inner heat.
Sunlit zone
The upper layer of the ocean is known as the sunlit, or euphotic, zone. Because water strongly absorbs light, sunlight penetrates only to depths of about 200 meters (656 feet).
Arctic ocean circulation
The complex ocean circulation system in the Arctic — which impacts the entire food web — is in a delicate balance.
Carbon cycle
Carbon is the building block of life on Earth and has a powerful impact on the planet’s climate.
Cycles
Oceanic cycles — chemical, physical, and biological — are related to cyclic processes in the Earth's atmosphere, such as the seasons, El Niño events, and long-term climate changes.
Glaciers & ice sheets
Glaciers are large ice masses created by snowfall that has transformed into ice and compressed over the course of many years. An ice sheet is a mass of glacial land ice extending more than 20,000 square miles.
Mid-ocean ridges
The mid-ocean ridge occurs along boundaries where plates are spreading apart.
Twilight zone
The ocean twilight zone is a layer of water that stretches around the globe. It lies 200 to 1,000 meters below the ocean surface, just beyond the reach of sunlight.
Currents, gyres, & eddies
At the surface and beneath, currents, gyres and eddies physically shape the coasts and ocean bottom.
Frozen ocean
The polar regions are experiencing unprecedented environmental changes that have significant potential impacts on global climate, ecosystems, and society.
Groundwater
Groundwater is water that exists underground in the spaces between grains of sand or gravel or in the cracks and fractures in solid rock—part of the global water cycle.
Midnight zone
The midnight zone, or bathypelagic, extends to about 4,000 meters (about 13,100 feet), which reaches the ocean floor in many places is in perpetual darkness.
Natural oil seeps
As much as one half of the oil that enters the coastal environment comes from natural seeps of oil and natural gas.
Ocean acidification
Ocean acidification is a reduction in the pH of the ocean over an extended period of time, caused primarily by an increase of carbon dioxide from the atmosphere.
Oxygen dead zones
Dead zones occur when the water lacks oxygen. Like us, marine animals require oxygen to breathe, and when oxygen levels drop too low they can suffocate.
El Niño
El Niño is a warming of surface waters in the eastern tropical Pacific Ocean, while La Niña is a cooling event.
Oceanus Magazine
[ ALL ]In-depth research on How the ocean works
Exploring Atlantic seeps
Answers from the abyss
A hadal zone mystery solved
A scientist’s quest to find Earth’s oldest ice
It’s the most ocean-friendly map ever created. Why haven’t more people seen it?
Luxury cruises with a side of climate science
Tiny drifters, massive impact
Three ocean robots that plunge into active volcanoes
Tracking the hidden currents of Cape Cod Bay
How an MIT-WHOI student used Google Earth to uncover a river–coral reef connection
The Ocean (Re)Imagined
