acid oceans in some regions acidification a \hundred times greater\
Last Updated : GMT 06:49:16
Arab Today, arab today
Arab Today, arab today
Last Updated : GMT 06:49:16
Arab Today, arab today

Acid oceans: in some regions acidification a 'hundred times greater'

Arab Today, arab today

Arab Today, arab today Acid oceans: in some regions acidification a 'hundred times greater'

Honolulu - Arabstoday

Emissions of carbon over the last two centuries have raised the acidity of the oceans to the highest levels in 21,000 years and likely beyond, according to a new study in Nature Climate Change. The change threatens a number of marine species, including coral reefs and molluscs. The oceans play a massive role in the carbon cycle, sequestering a significant amount of the carbon released naturally. But for the past couple centuries human activities, such as burning fossil fuels and deforestation, have substantially increased the amount of carbon emitted into the atmosphere, forcing the oceans to sequester more. Currently, the oceans sequester about one third of all carbon emissions, however this influx of carbon is not benign: the carbon lowers the sea waters pH levels (a rise in acidity). "In some regions, the man-made rate of change in ocean acidity since the Industrial Revolution is hundred times greater than the natural rate of change between the Last Glacial Maximum and pre-industrial times," explains lead author Tobias Friedrich at the International Pacific Research Center, University of Hawaii at Manoa, Honolulu, Hawaii. The researchers used computer models to estimate the the abundance of a calcium carbonate known as aragonite in sea water—a commonly used proxy for acidification—from the Last Glacier Maximum (21,000 years ago) to today. According to the authors, it's not just the level of acidity that is worrisome, but the speed at which it is happening. "When Earth started to warm 17,000 years ago, terminating the last glacial period, atmospheric CO2 levels rose from 190 parts per million (ppm) to 280 ppm over 6,000 years. Marine ecosystems had ample time to adjust. Now, for a similar rise in CO2 concentration to the present level of 392 ppm, the adjustment time is reduced to only 100–200 years," Friedrich says. Species that produce shells and plates out of calcium carbonate are at risk from acidification, since acidity lowers the amount of available calcium carbonate. Carbonate ion concentrations are currently at their lowest rate in nearly a million years endangering shell fish, types of algae, foraminifera, pteropods, and corals. According to a recent report by 2100, 70 percent of cold water corals will be exposed to high acidification levels. As the most biodiverse ecosystem in the oceans, many species stand to lose out if coral reefs vanish. "Our results suggest that severe reductions are likely to occur in coral reef diversity, structural complexity and resilience by the middle of this century," says co-author Professor Axel Timmermann, also with the International Pacific Research Center in Hawaii. Currently the only long-term solution to ocean acidification is to cut global carbon emissions.

arabstoday
arabstoday

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

acid oceans in some regions acidification a \hundred times greater\ acid oceans in some regions acidification a \hundred times greater\

 



Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

acid oceans in some regions acidification a \hundred times greater\ acid oceans in some regions acidification a \hundred times greater\

 



GMT 16:47 2017 Wednesday ,29 March

Asala feels more nostalgic for Syria

GMT 06:41 2014 Monday ,01 September

July 22 - August 22

GMT 02:17 2017 Monday ,23 October

Feb20/Mar20

GMT 12:58 2014 Tuesday ,03 June

NuBo to launch Hair Growth Factor

GMT 11:39 2011 Saturday ,24 September

New York city ballet“Ocean’s Kingdom”

GMT 02:07 2017 Sunday ,24 September

May22nd-June21st

GMT 02:06 2017 Thursday ,28 September

August24th-September23rd

GMT 22:08 2017 Sunday ,19 November

Bahraini women’s empowerment discussed

GMT 15:32 2017 Tuesday ,28 February

Gumtree bans donkey sales in S.Africa over skin trade

GMT 20:48 2018 Friday ,14 September

Volkswagen to end production of the Beetle next year

GMT 13:36 2015 Thursday ,19 March

Sabkhas ideal source of energy

GMT 08:31 2014 Friday ,16 May

Interior design living room

GMT 10:01 2014 Friday ,06 June

February 18 - March 19

GMT 13:11 2015 Wednesday ,18 March

Britain moving 'from austerity to prosperity'
Arab Today, arab today
 
 Arab Today Facebook,arab today facebook  Arab Today Twitter,arab today twitter Arab Today Rss,arab today rss  Arab Today Youtube,arab today youtube  Arab Today Youtube,arab today youtube

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

arabstoday arabstoday arabstoday arabstoday
arabstoday arabstoday arabstoday
arabstoday
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
arabstoday, Arabstoday, Arabstoday