Ocean Deoxygenation Quiz

Approximately what percentage of dissolved oxygen has the ocean lost globally since the 1950s?

• Around 2%

• Around 5%

• Around 10%

• Around 15%

What is one of the main reasons for oxygen loss in the ocean?

• Decrease in marine life

• Ocean warming

• Increase in ocean salinity

• Reduction in carbon dioxide levels

Which areas of the ocean are mainly affected by deoxygenation?

• Open ocean regions

• Deep sea trenches

• Coastal waters

• Polar ice caps

What are the ocean coastal areas with less oxygen called?

• Oxygen minimum zones

• Dead zones

• Red tides

• Anoxic zones

What is the depth range where most oxygen loss occurs in the ocean?

• 0-100 m

• 0-500 m

• 0-1 km

• 0-2 km

Which report provided a warning about ocean warming and deoxygenation?

• IPCC Special Report on the Ocean and Cryosphere

• IUCN report on ocean deoxygenation

• Paris Agreement

• EU policies on ocean conservation

What is the projected additional loss of oxygen in the ocean by 2100?

• 0.5-1%

• 1-7%

• 5-10%

• 10-15%

What is the global ocean heat content increase in the 0-700 m depth range?

• 0.5 W/m²

• 0.9 W/m²

• 1.2 W/m²

• 1.5 W/m²

What is the rate of increase in global sea surface temperature per year?

• 0.0014 °C/year

• 0.0104 °C/year

• 0.014 °C/year

• 0.104 °C/year

Which of the following is a solution proposed to address ocean deoxygenation?

• Increasing global ocean heat content

• Reducing greenhouse gas emissions

• Expanding coastal urbanization

• Decreasing marine biodiversity