Over 90% of the excess heat trapped in Earth's system by greenhouse gas emissions since the 1970s has been absorbed by the oceans. This massive heat uptake, largely stored in the upper 700 meters, has driven a ~0.11°C increase in ocean temperatures per decade over the past 50 years.

 Over 90% of the excess heat trapped in Earth's system by greenhouse gas emissions since the 1970s has been absorbed by the oceans. This massive heat uptake, largely stored in the upper 700 meters, has driven a ~0.11°C increase in ocean temperatures per decade over the past 50 years. 

Key details about this phenomenon include:-
Heat Distribution: -
Beyond the surface, deeper ocean layers from 700 meters down to the floor have absorbed roughly 30% of this excess heat.
Impact on Sea Levels: -
The absorbed heat causes water to expand (thermal expansion), which, along with melting ice, contributes significantly to rising sea levels.
Consequences: -
This warming leads to increased marine heatwaves, coral bleaching, reduced oxygen levels, and altered marine ecosystems.
Climate Buffer: -
The ocean acts as a crucial, yet temporary, heat sink, buffering the atmosphere from more extreme temperature .
This immense, long-term heat storage has profound, lasting effects on both marine biodiversity and coastal human populations. 
Three decades of ocean warming impacts on marine ecosystems
Over the past 50 years, the ocean has absorbed ∼90% of the atmospheric heat due to the increase in greenhouse gases concentrations.

MJF Lion ER YK Sharma 

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