Oceanography: Currents, Tides, and Ocean Resources
TOPIC CLASSIFICATION
Subject: Geography - Oceanography
Sub-topic: Ocean Currents, Tides, Ocean Resources, Marine Ecology
Mains GS Paper-I: Physical geography - oceans, currents, tides, and resource distribution.
EXAMINER REASONING
Oceanography is a foundational physical geography topic. Prelims tests: names of major currents (Gulf Stream, Kuroshio, Labrador, Humboldt/Peru), causes of tides (spring vs. neap), ocean resources (polymetallic nodules, gas hydrates), and UNCLOS zones (EEZ, continental shelf). Mains demands: (a) role of ocean currents in global climate (thermohaline circulation, ENSO), (b) tidal energy potential in India, (c) ocean resources and the Blue Economy, (d) IOD and monsoon linkage. The Indian Ocean focus distinguishes Indian UPSC from generic oceanography.
Core Concept
Ocean Currents - Causes and Types:
| Factor | Effect |
|---|---|
| Wind belts | Trade winds → equatorial currents; westerlies → N. Atlantic/N. Pacific drift |
| Coriolis force | Deflects currents to the right (NH) / left (SH) - gyre circulation |
| Temperature/Salinity | Thermohaline circulation (deep water formation in polar regions) |
| Continental deflection | Currents redirected by landmasses |
| Earth's rotation | Western boundary currents (Gulf Stream, Kuroshio) are faster, deeper, narrower |
This note is temporarily free
UPSC Margin is open for 3 months. All notes, full-length mock tests, and daily current affairs are free during this window.
Monthly
₹299
per month
Yearly
₹1,999
per year
No account? Create one free