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Our Seas: Human-Induced Change Could Affect as Much as Half of World’s Oceans

19th August 2020
In addition to the GreenNews.ie story below according to the BBC News an ocean-sieving expedition revealed 12 to 21 million tonnes of plastic fragments are suspended in the Atlantic ocean noting Plastics can take 'hundreds of years to degrade'. The expedition Afloat adds was carried out by the RRS Discovery operated by the UK's Natural Environment Research Council fleet will include the state-of-the-art polar research ship RRS Sir David Attenborough which was launched on Merseyside. In addition to the GreenNews.ie story below according to the BBC News an ocean-sieving expedition revealed 12 to 21 million tonnes of plastic fragments are suspended in the Atlantic ocean noting Plastics can take 'hundreds of years to degrade'. The expedition Afloat adds was carried out by the RRS Discovery operated by the UK's Natural Environment Research Council fleet will include the state-of-the-art polar research ship RRS Sir David Attenborough which was launched on Merseyside. Photo: BBC News-facebook

Oceans given human-induced change, writes GreenNews.ie, may have been affected as much as half of the Atlantic, Pacific and Indian Oceans, a new study has revealed.

A new article in Nature Climate Change predicted through climate modelling that 20 to 55 per cent of the Atlantic, Pacific and Indian basins would have an “emergent anthropogenic signal” in 2020 and that figure would climb to between 40 and 65 per cent by the middle of this century.

The current model projects that the percentage will fall between 55 and 80 per cent in 2080.

Oceanic change (Atlantic see: BBC News) as a result of the climate crisis affects both temperature and salinity, which results in “widespread and irreversible impacts”, according to the authors of the study.

While the most pronounced change is found in the upper ocean, research has indicated that changes in water masses at depth have been identified and “will probably strengthen in the future”, they added.

The first indications of global ocean heat content change was identified in the early 2000s and studies have continued to investigate trends ever since.

Anthropogenic change remains undetected in “vast regions of the World Ocean”, according to the study, but the authors note that the lack of recorded change could be due to poor observational coverage.

Further maintenance and augmentation of an ocean observing system capable of detecting and monitoring persistent anthropogenic changes therefore is needed in order to monitor the ocean, the study concluded.

For more on the effects of a changing ocean click here and scroll down. 

Published in Marine Science
Jehan Ashmore

About The Author

Jehan Ashmore

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Jehan Ashmore is a marine correspondent, researcher and photographer, specialising in Irish ports, shipping and the ferry sector serving the UK and directly to mainland Europe. Jehan also occasionally writes a column, 'Maritime' Dalkey for the (Dalkey Community Council Newsletter) in addition to contributing to UK marine periodicals. 

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Marine Science Perhaps it is the work of the Irish research vessel RV Celtic Explorer out in the Atlantic Ocean that best highlights the essential nature of marine research, development and sustainable management, through which Ireland is developing a strong and well-deserved reputation as an emerging centre of excellence. From Wavebob Ocean energy technology to aquaculture to weather buoys and oil exploration these pages document the work of Irish marine science and how Irish scientists have secured prominent roles in many European and international marine science bodies.

 

At A Glance – Ocean Facts

  • 71% of the earth’s surface is covered by the ocean
  • The ocean is responsible for the water cycle, which affects our weather
  • The ocean absorbs 30% of the carbon dioxide added to the atmosphere by human activity
  • The real map of Ireland has a seabed territory ten times the size of its land area
  • The ocean is the support system of our planet.
  • Over half of the oxygen we breathe was produced in the ocean
  • The global market for seaweed is valued at approximately €5.4 billion
  • · Coral reefs are among the oldest ecosystems in the world — at 230 million years
  • 1.9 million people live within 5km of the coast in Ireland
  • Ocean waters hold nearly 20 million tons of gold. If we could mine all of the gold from the ocean, we would have enough to give every person on earth 9lbs of the precious metal!
  • Aquaculture is the fastest growing food sector in the world – Ireland is ranked 7th largest aquaculture producer in the EU
  • The Atlantic Ocean is the second largest ocean in the world, covering 20% of the earth’s surface. Out of all the oceans, the Atlantic Ocean is the saltiest
  • The Pacific Ocean is the largest ocean in the world. It’s bigger than all the continents put together
  • Ireland is surrounded by some of the most productive fishing grounds in Europe, with Irish commercial fish landings worth around €200 million annually
  • 97% of the earth’s water is in the ocean
  • The ocean provides the greatest amount of the world’s protein consumed by humans
  • Plastic affects 700 species in the oceans from plankton to whales.
  • Only 10% of the oceans have been explored.
  • 8 million tonnes of plastic enter the ocean each year, equal to dumping a garbage truck of plastic into the ocean every minute.
  • 12 humans have walked on the moon but only 3 humans have been to the deepest part of the ocean.

(Ref: Marine Institute)

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