The oceans cover roughly 71% of Earth's surface. They store heat, exchange gases with the atmosphere, support extraordinary biodiversity and connect distant parts of our planet.
1. What Is Oceanography?
Oceanography is the scientific study of the oceans. It includes physical oceanography, marine chemistry, marine geology and biological oceanography. Researchers combine field observations, instruments, satellites and computer models to understand the sea.
2. How Do Ocean Currents Work?
Ocean currents move water across the planet. Surface currents are strongly influenced by winds and Earth's rotation. Deep-ocean circulation is also influenced by differences in water density associated with temperature and salinity.
These movements redistribute heat and nutrients, influencing regional climates and marine ecosystems.
3. Life Beneath the Waves
Marine habitats range from sunlit coral reefs and coastal wetlands to the dark deep sea. Plankton, fish, corals, marine mammals and many other organisms form complex food webs.
Ocean ecosystems face pressures including warming, acidification, pollution, habitat damage and overfishing. Monitoring and conservation help inform better management.
4. Why Are Oceans Important for Climate?
Oceans absorb and redistribute a substantial amount of excess heat associated with global warming. They also exchange carbon dioxide with the atmosphere. These processes affect climate, sea level and the chemistry of seawater.
5. How Do Scientists Explore the Ocean?
- Satellites observe sea-surface conditions over large areas.
- Buoys and floats measure temperature, salinity and currents.
- Research vessels collect samples and map the seafloor.
- Underwater vehicles explore environments that are difficult to reach.