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💡 Rivers within the sea
The same winds that sweep the sky drag the ocean’s surface into great looping currents that carry warmth around the planet — keeping some European ports ice-free in winter.
What are ocean currents and gyres?
- Ocean currents are the continuous movement of large masses of ocean water, driven by planetary winds dragging the surface, plus temperature, salinity, the Earth’s rotation and land distribution.
- The Earth’s rotation deflects these masses into large circular patterns called gyres — clockwise in the Northern Hemisphere, anticlockwise in the Southern (Fig. 13.10a).
- Currents move heat from the equator to the poles, reducing temperature differences; the North Atlantic Drift (from the Gulf Stream) keeps European ports ice-free and carries nutrients that support ecosystems.
⏸▶ Pause and Ponder
- 2. The cool mountain breeze lowers temperature and adds moisture, helping crops and keeping the soil healthy.
- 3. As warm equatorial surface water travels to the poles it releases heat, warming those regions and moderating their climate.
🏛 India’s Scientific Contributions
Scientists at the Indian Institute of Tropical Meteorology (IITM), Pune run advanced computer models that couple the energy flows between atmosphere, oceans, land and ice to simulate the Indian monsoon. Using data from satellites, ocean buoys and even Antarctic stations, they improve seasonal forecasts and study how global warming may change monsoon rainfall across India.
