BharatNotes Albedo
noun (uncountable; technical countable)Usage in a UPSC answer
The retreat of Arctic sea ice has triggered a self-reinforcing ice-albedo feedback loop, wherein reduced reflectivity accelerates ocean warming, which in turn hastens further ice loss.
Synonyms
Antonyms
Word Family
albedic (adjective, rare), co-albedo (noun), spectral albedo (noun phrase)
Root
Latin albus = white; suffix -edo = quality or state (as in torpedo)
Etymology
From Latin albedo meaning 'whiteness', used by medieval scholars to describe the brightness of celestial bodies. The term entered optics and astronomy through Johannes Kepler and was adapted into climatology in the 20th century as the science of Earth's energy budget developed after World War II.
Memory Hook
ALBEDO = ALB (Latin for white) + EDO (I eat / quality). Think of a white surface 'eating' very little sunlight because it reflects most of it back. Snow is white → high albedo → reflects heat → stays cold.
How This Word Works in UPSC Writing
The proportion of incoming solar radiation reflected by a surface. It is central to GS1 and GS3 climate answers because it drives a powerful feedback: ice and snow have high albedo, so melting exposes darker ocean or land, which absorbs more radiation and accelerates further melting. Fresh snow reflects most of the radiation reaching it while open ocean reflects very little, and that contrast is what makes the ice-albedo feedback so consequential.
Don’t Confuse It With
Albedo is the fraction of incoming radiation reflected. Emissivity concerns how efficiently a surface radiates energy away. Insolation is the incoming solar radiation itself. Radiative forcing is the net change in the energy balance, to which albedo change is one contributor.
Hindi Meaning
एल्बिडो (elbido) or परावर्तनांक (parāvartanānk), reflectance.
Common Questions
- What is albedo?
- The proportion of incoming solar radiation that a surface reflects rather than absorbs.
- What is the ice-albedo feedback?
- Melting ice exposes darker ocean or land that absorbs more solar radiation, which warms the surface further and causes still more melting.
Tip: press Alt+S to hear pronunciation
