Albedo

noun (plural: albedos or albedoes)

/ælˈbiːdoʊ/

The fraction of incoming solar radiation that is reflected by a surface, measured on a scale from 0 (total absorption) to 1 (total reflection), with Earth's average albedo being approximately 0.30.

✍️ Usage in a UPSC answer

The retreat of Arctic sea ice lowers the planet's albedo, setting off a dangerous feedback loop in which darker ocean waters absorb more solar radiation and further accelerate global warming — a phenomenon that lends urgency to India's advocacy of climate justice at multilateral forums.

Synonyms

reflectivityreflectancereflective powerreflection coefficientwhiteness

Antonyms

absorptivityabsorptanceopacity to reflection (low reflectivity)blackness

🌱 Word Family

albedo (n), albedos (n pl), alb (n), albumen (n), albino (n), albescent (adj)

🔡 Root

Latin albus = white + -ēdō = abstract noun suffix → albēdō = whiteness

📜 Etymology

From Latin albēdō ("whiteness"), from albus ("white") + -ēdō (abstract noun suffix); first used in English in an astronomical context in 1859.

🧠 Memory Hook

Think ALBino — Latin albus means 'white'. ALBEDO measures how 'white' (reflective) a surface is: albino-white snow has high albedo and bounces sunlight back; dark asphalt has low albedo and soaks it up.

🌍 Geography 📖 Seen in: Atmosphere, Climatology & Pressure Bel...

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