Arctic Carbon Release: What Happens to It in the Ocean?

Topic: Environment

Scientists studied how carbon from melting Arctic permafrost enters the ocean. They found that most of it stays buried on the seafloor, but some is broken down by microorganisms and released as greenhouse gases.

The Arctic's frozen ground holds a massive amount of organic carbon. As the planet warms, this carbon starts to thaw and flow into the ocean through rivers and coastal erosion.

Researchers from the Alfred Wegener Institute and MARUM - Centre for Marine Environmental Sciences at the University of Bremen wanted to know what happens to this carbon in the ocean. They collected sediment cores from off the coast of Herschel Island in Canada and analyzed them.

Their findings showed that only a small share of the carbon swept into the ocean becomes part of the active carbon cycle. Most of it stays buried on the seafloor, but some is broken down by microorganisms and released as greenhouse gases. The team also discovered that these microorganisms prefer fresh carbon from the ocean over older carbon released from permafrost.

The study's lead author, Dr. Manuel Ruben, explained that understanding where this carbon ends up is crucial for estimating how thawing permafrost could affect the climate. He noted that up to 0.02 gigatonnes of carbon are entering the sea each year, and forecasts suggest this outflow could rise by 70 to 150 percent by 2100.

Why It Matters

This research is important for India because it helps us understand how climate change affects our planet. As one of the most vulnerable countries to rising temperatures, it's essential to know how carbon release from melting permafrost contributes to global warming.

Key Facts

• The Arctic's frozen ground contains about 1,300 gigatonnes of organic carbon.
• Up to 0.02 gigatonnes of this carbon are entering the sea each year.
• Most of the carbon stays buried on the seafloor, but some is broken down by microorganisms and released as greenhouse gases.
• The team discovered that marine microorganisms prefer fresh carbon from the ocean over older carbon released from permafrost.
• Forecasts suggest the outflow of carbon could rise by 70 to 150 percent by 2100.

Key Terms

Permafrost

Frozen ground that remains frozen for two or more consecutive years.

Microorganisms

Tiny living things, such as bacteria and archaea, that break down organic matter.

Implications

This research is important for India because it helps us understand how climate change affects our planet. As one of the most vulnerable countries to rising temperatures, it's essential to know how carbon release from melting permafrost contributes to global warming.