Question Q.14GS3GS1

Discuss the repercussions on marine ecosystem and economy resulting from the combined effects of ocean acidification, ocean warming, and oxygen loss.

Main Body

The accelerated nature of climate change and global warming had led to alarming levels of ocean acidification, warming and oxygen loss

[Diagram showing: Green house gas emissionsIncrease in global temperatureGlobal warmingReduction in dissolved oxygen]

[Second part: Increased CO2 absorption by oceanOcean acidification (H2O+CO2H2CO3, H2CO3H+HCO3-)]

This phenomenon will impact marine ecosystem and the economy that is dependent on them

Repercussions on marine ecosystem

1Coral bleaching and mass death due to rise in temperature

Rainforests of ocean death will enhance extinction rates

2Ocean currents pattern change, which may impact migration pattern

ex Inability in Atlantic meridian ocean circulation (AMOC)

3Benthic ecosystems become unstable due to rise in acidification and warm water influx

4Phytoplankton ecosystem and sea grasston will be not able to furnish heat

5Increasing frequency of Marine heat waves

ex Recenty in california Coast

Blue economy repercussions

6Fishing will be impacted as the number

of fish will be reduced

1Tourism decline as death of coastal can attract tourist

2Decay of coastal ecosystems like mangroves will impact the people dependent on them

3Coastal aqua culture and sea weed cultivation will be facing losses ex Gulf of Mannar region.

Measure needed:

2030 target - keeping 30% ocean ecosystem by 2030

Reducing green house gas (GHGs) emission by enhancing NDCs (National Determined Commitment)

Rehabilitation of corals ex Biorock technology

Marine ecosystems are sensitive and hence any small changes can have exponential impact.

249 words14 paragraphs4 bullet points

Diagram

Flow diagram showing: (1) Greenhouse gas emissions leading to increase in global temperature and global warming, causing reduction in dissolved oxygen; (2) Increased CO2 absorption by ocean leading to ocean acidification with chemical equations H2O+CO2→H2CO3 and H2CO3→H++HCO3-

Scientific approach with chemical equations
Connects multiple phenomena
Comprehensive listing of ecosystem impacts
Specific examples provided (California Coast, AMOC)
Connects ecosystem impacts to economic consequences
Provides specific solutions and targets
Mentions international frameworks (NDCs)

Open original scan

Page 30

Topper

CHAKKA SNEHITHUPSC

AIR 1392025

Subject & Paper

GS3GS1

Topic

Environmental Geography and Climate Change

Marine Ecosystem and Climate

Ocean acidification, warming, and oxygen loss

Writing Stats

249

Total words

Paragraphs

Bullets

scientific-analytical

Tone