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[[Berkas:WOA05Estimated GLODAPchange delin annual mean sea surface pH AYoolfrom 1770s-1990s (GLODAP).png|jmpl|ka|300px|Perkiraan perubahan [[pH]] air laut yang disebabkan oleh [[karbon dioksida]] yang dihasilkan manusia, sejak tahun 1700-an sampai 1990-an. Data dari [[Global Ocean Data Analysis Project]] dan [[World Ocean Atlas]].]]
 
'''Peningkatan keasaman air laut''' adalah peristiwa berkurangnya [[pH]] [[lautan]] yang berada di bumi, yang disebabkan oleh penyerapan [[karbon dioksida]] dari atmosfer (pH berkurang = keasaman meningkat).<ref name=cald03>{{Cite journal |last=Caldeira |first=K. |coauthors=Wickett, M. E. |year=2003 |title=Anthropogenic carbon and ocean pH |url=http://pangea.stanford.edu/research/Oceans/GES205/Caldeira_Science_Anthropogenic%20Carbon%20and%20ocean%20pH.pdf |journal=[[Nature (journal)|Nature]] |volume=425 |issue=6956 |pages=365–365 |doi=10.1038/425365a |pmid=14508477 |bibcode=2001AGUFMOS11C0385C |ref=harv}}</ref> Diperkirakan 30-40% karbon dioksida yang dilepaskan oleh manusia ke atmosfer larut ke perairan.<ref name=millero95>{{Cite journal |last=Millero|first=Frank J. |year=1995 |title=Thermodynamics of the carbon dioxide system in the oceans |url=http://www.sciencedirect.com/science/article/pii/001670379400354O | archiveurl = | archivedate = | journal=Geochimica et Cosmochimica Acta |volume=59 |issue=4 |pages=661–677 |doi= 10.1016/0016-7037(94)00354-O|pmid= |bibcode= 1995GeCoA..59..661M |ref=harv}}</ref><ref name=Feely04>{{cite journal |last=Feely |first=R. A. |coauthors=''et al.'' |title=Impact of Anthropogenic CO<sub>2</sub> on the CaCO<sub>3</sub> System in the Oceans |journal=Science |volume=305 |year=2004 |month=July |pages=362–366 |url=http://www.sciencemag.org/content/305/5682/362.abstract |bibcode = 2004Sci...305..362F |doi = 10.1126/science.1097329 |pmid=15256664 |issue=5682 |ref=harv}}</ref> Untuk mempertahankan [[kesetimbangan kimia]], sebagian akan bereaksi dengan air membentuk [[asam karbonat]]. Sebagian dari molekul asam karbonat akan beraksi dengan molekul air membentuk ion [[bikarbonat]] dan ion [[hydroniumhidronium]], sehingga meningkatkan [[keasaman]] laut. Antara tahun 1751 hingga 1994, pH permukaan laut diperkirakan menurun dari 8.25 menjadi 8.14,<ref name=jacob05>{{cite journal | last=Jacobson | first=M. Z. | year=2005 | title=Studying ocean acidification with conservative, stable numerical schemes for nonequilibrium air-ocean exchange and ocean equilibrium chemistry | journal=[[Journal of Geophysical Research]] – Atmospheres | volume=110 | doi=10.1029/2004JD005220 | url=http://www.agu.org/journals/ABS/2005/2004JD005220.shtml | pages=D07302 | bibcode=2005JGRD..11007302J | ref=harv}}</ref> yang merupakan peningkatan konsentrasi ion hydroniumhidronium sebanyak 30% di lautan.<ref name="pmid18536730">{{Cite journal |author=Hall-Spencer, J. M. |coauthors=Rodolfo-Metalpa, R.; Martin, S.; ''et al.'' |title=Volcanic carbon dioxide vents show ecosystem effects of ocean acidification |journal=[[Nature (journal)|Nature]] |volume=454 |issue=7200 |pages=96–9 |year=2008 |month=July |pmid=18536730 |doi=10.1038/nature07051 |bibcode=2008Natur.454...96H |ref=harv}}</ref><ref name="scor-int">[http://www.scor-int.org/OBO2009/A&O_Report.pdf Report of the Ocean Acidification and Oxygen Working Group, International Council for Science's Scientific Committee on Ocean Research (SCOR) Biological Observatories Workshop]</ref>
 
Peningkatan keasaman air aut diperkirakan memiliki beragam konsekuensi, seperti penurunan laju metabolisme [[cumi-cumi jumbo]] (''Dosidicus gigas''),<ref name=Rosa>{{cite journal |last=Rosa |first=R. |last2=Seibel |first2=B. |title=Synergistic effects of climate-related variables suggest future physiological impairment in a top oceanic predator |journal=P.n.a.s. |volume=105 |year=2008 |month= |pages=20776–20780 |url=http://www.pnas.org/content/105/52/20776.short |bibcode = 2008PNAS..10520776R |doi = 10.1073/pnas.0806886105 |issue=52 |ref=harv |access-date=2013-12-01 |archive-date=2014-12-06 |archive-url=https://web.archive.org/web/20141206113108/http://www.pnas.org/content/105/52/20776.short |dead-url=yes }}</ref> penurunan sistem imunitas kerang biru,<ref name=Bibby>{{cite journal |last=Bibby |first=R. |coauthors=''et al.'' |title=Effects of ocean acidification on the immune response of the blue mussel Mytilus edulis |journal=Aquatic Biology |volume=2 |year=2008 |month= |pages=67–74 |url=http://www.int-res.com/abstracts/ab/v2/n1/p67-74/ |doi=10.3354/ab00037 |ref=harv }}</ref> dan [[pemutihan koral]].
 
== Reaksi kimia ==
Reaksi kimia lain juga terjadi sehingga kadar ion karbonat di lautan yang tersedia akan berkurang. Hal ini akan menyulitkan bagi hewan laut yang membutuhkan ion karbonat bagi pertumbuhan hidupnya seperti [[koral]] untuk proses kalsifikasi tubuhnya, dan beberapa jenis [[plankton]]. Struktur yang mengandung ion karbonat pun akan cepat rapuh karena larut oleh asam.<ref name=orr05>{{Cite journal |last=Orr |first=James C. |coauthors=''et al.'' |year=2005 |title=Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms |url=http://www.ipsl.jussieu.fr/~jomce/acidification/paper/Orr_OnlineNature04095.pdf |archiveurl=https://web.archive.org/web/20080625100559/http://www.ipsl.jussieu.fr/~jomce/acidification/paper/Orr_OnlineNature04095.pdf |archivedate=2008-06-25 |journal=[[Nature (journal)|Nature]] |volume=437 |issue=7059 |pages=681–686 |doi=10.1038/nature04095 |pmid=16193043 |bibcode=2005Natur.437..681O |ref=harv |access-date=2013-12-01 |dead-url=no }}</ref> Peningkatan keasaman lautan akan memicu gangguan pada [[rantai makanan]] yang ada pada dan terhubung dengan lautan.<ref>{{cite news|url=http://www.nytimes.com/2009/01/31/science/earth/31ocean.html|title=Rising Acidity Is Threatening Food Web of Oceans, Science Panel Says|author=Cornelia Dean|publisher=New York Times|date=January 30, 2009}}</ref><ref>{{cite journal|author= Robert E. Service |title= Rising Acidity Brings and Ocean Of Trouble |journal=Science|pages= 146–148 |volume= 337 |date= 13 July 2012|bibcode = 2012Sci...337..146S|doi= 10.1126/science.337.6091.146|pmid= 22798578|issue= 6091|ref= harv }}</ref> Sebanyak 105 [[akademi ilmu pengetahuan]] telah mengeluarkan rekomendasi untuk mengurangi emisi karbon dioksida global sebanyak setidaknya 50% dari tingkat emisi tahun 1990.<ref name="iap statement">{{Cite web | author=IAP | title=Interacademy Panel (IAP) Member Academies Statement on Ocean Acidification | date=June 2009 | url=http://www.interacademies.net/10878/13951.aspx | ref=harv | postscript={{inconsistent citations}} | access-date=2013-12-01 | archive-date=2013-08-06 | archive-url=https://web.archive.org/web/20130806073912/http://www.interacademies.net/10878/13951.aspx | dead-url=yes }}, Secretariat: TWAS (the Academy of Sciences for the Developing World), Trieste, Italy.</ref>▼
 
: <big>{{CO2}} (g) + H<sub>2</sub>O (l) {{eqm}} {{CO2}} (aq) + H<sub>2</sub>O (l) {{eqm}} H<sub>2</sub>CO<sub>3</sub> (aq) {{eqm}} HCO<sub>3</sub><sup>−</sup> (aq) + H<sup>+</sup> (aq) {{eqm}} CO<sub>3</sub><sup>2−</sup> (aq) + 2 H<sup>+</sup> (aq)</big>
 
▲[[Reaksi kimia]] lain juga terjadi sehingga kadar ion karbonat di lautan yang tersedia akan berkurang. Hal ini akan menyulitkan bagi hewan laut yang membutuhkan ion karbonat bagi pertumbuhan hidupnya seperti [[koral]] untuk proses kalsifikasi tubuhnya, dan beberapa jenis [[plankton]]. Struktur yang mengandung ion karbonat pun akan cepat rapuh karena larut oleh asam.<ref name=orr05>{{Cite journal |last=Orr |first=James C. |coauthors=''et al.'' |year=2005 |title=Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms |url=http://www.ipsl.jussieu.fr/~jomce/acidification/paper/Orr_OnlineNature04095.pdf |archiveurl=https://web.archive.org/web/20080625100559/http://www.ipsl.jussieu.fr/~jomce/acidification/paper/Orr_OnlineNature04095.pdf |archivedate=2008-06-25 |journal=[[Nature (journal)|Nature]] |volume=437 |issue=7059 |pages=681–686 |doi=10.1038/nature04095 |pmid=16193043 |bibcode=2005Natur.437..681O |ref=harv |access-date=2013-12-01 |dead-url=no }}</ref> Peningkatan keasaman lautan akan memicu gangguan pada [[rantai makanan]] yang ada pada dan terhubung dengan lautan.<ref>{{cite news|url=http://www.nytimes.com/2009/01/31/science/earth/31ocean.html|title=Rising Acidity Is Threatening Food Web of Oceans, Science Panel Says|author=Cornelia Dean|publisher=New York Times|date=January 30, 2009}}</ref><ref>{{cite journal|author= Robert E. Service |title= Rising Acidity Brings and Ocean Of Trouble |journal=Science|pages= 146–148 |volume= 337 |date= 13 July 2012|bibcode = 2012Sci...337..146S|doi= 10.1126/science.337.6091.146|pmid= 22798578|issue= 6091|ref= harv }}</ref> Sebanyak 105 [[akademi ilmu pengetahuan]] telah mengeluarkan rekomendasi untuk mengurangi emisi karbon dioksida global sebanyak setidaknya 50% dari tingkat emisi tahun 1990.<ref name="iap statement">{{Cite web | author=IAP | title=Interacademy Panel (IAP) Member Academies Statement on Ocean Acidification | date=June 2009 | url=http://www.interacademies.net/10878/13951.aspx | ref=harv | postscript={{inconsistent citations}} | access-date=2013-12-01 | archive-date=2013-08-06 | archive-url=https://web.archive.org/web/20130806073912/http://www.interacademies.net/10878/13951.aspx | dead-url=yes }}, Secretariat: TWAS (the Academy of Sciences for the Developing World), Trieste, Italy.</ref>
 
Peningkatan keasaman air laut telah terjadi sebelumnya dalam [[sejarah bumi]], seperti peristiwa ''[[Paleocene-Eocene Thermal Maximum]]'' (PETM),<ref name=Zachos2005>{{cite journal | author = Zachos, J.C. | coauthors = Röhl, U.; Schellenberg, S.A.; Sluijs, A.; Hodell, D.A.; Kelly, D.C.; Thomas, E.; Nicolo, M.; Raffi, I.; Lourens, L. J.; McCarren, H.; Kroon, D. | title = Rapid acidification of the ocean during the Paleocene-Eocene thermal maximum | year = 2005 | journal = Science | volume = 308 | pages = 1611–1615 | doi = 10.1126/science.1109004 | issue = 5728 | pmid = 15947184 | ref = harv }}</ref> yang terjadi setidaknya 56 juta tahun yang lalu dan menyebabkan pelarutan struktur karbonat hewan laut hingga membentuk sedimen di basin lautan di seluruh dunia.
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* {{Cite book
|year=2011
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* Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC) (2008). [https://web.archive.org/web/20080722034317/http://www.acecrc.org.au/uploaded/117/797619_20pa02_acidification_0805.pdf Position analysis: CO<sub>2</sub> emissions and climate change: Ocean impacts and adaptation issues.] ISSN: 1835–7911. Hobart, Tasmania.
* {{Cite journal|last=Cicerone|first=R.|coauthors=J. Orr, P. Brewer ''et al.''|year=2004|title=The Ocean in a High {{chem|CO|2}} World|url=http://www.ipsl.jussieu.fr/~jomce/pubs/Cicerone_etal_2004_EOS.pdf|journal=[[Eos (journal)|Eos, Transactions, American Geophysical Union]]|publisher=[[American Geophysical Union]]|volume=85|issue=37|pages=351–353|doi=10.1029/2004EO370007|bibcode=2004EOSTr..85R.351C|ref=harv|access-date=2013-12-01|archive-date=2007-03-05|archive-url=https://web.archive.org/web/20070305235225/http://www.ipsl.jussieu.fr/~jomce/pubs/Cicerone_etal_2004_EOS.pdf|dead-url=yes}}
* {{Cite journal|last=Doney|first=S. C. |year=2006|title=The Dangers of Ocean Acidification|url=https://archive.org/details/sim_scientific-american_2006-03_294_3/page/58|journal=[[Scientific American]] |issn=0036-8733|volume=294|issue=3|pages=58–65 |doi=10.1038/scientificamerican0306-58|pmid=16502612|ref=harv}}, ([http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=00057536-E87F-13F5-A75F83414B7FFE9F Article preview only]).
* {{Cite journal|last=Feely|first=R. A.|coauthors=Sabine, Christopher L.; Lee, Kitack; Berelson, Will; Kleypas, Joanie; Fabry, Victoria J.; Millero, Frank J.|year=2004|title=Impact of Anthropogenic {{chem|CO|2}} on the {{chem|CaCO|3}} System in the Oceans|url=http://www.sciencemag.org/cgi/content/abstract/sci;305/5682/362|journal=[[Science (journal)|Science]] |volume=305|issue=5682|pages=362–366|doi=10.1126/science.1097329|pmid=15256664|bibcode = 2004Sci...305..362F|ref=harv }}
* {{Cite journal | last1=Harrould-Kolieb | first1=E. | last2=Savitz | first2=J. | year=2008 | url=http://na.oceana.org/en/news-media/publications/reports/acid-test-can-we-save-our-oceans-from-co2 | title=Acid Test: Can We Save Our Oceans From CO<sub>2</sub>? | journal=Oceana | ref=harv | access-date=2013-12-01 | archive-date=2011-10-09 | archive-url=https://web.archive.org/web/20111009114644/http://na.oceana.org/en/news-media/publications/reports/acid-test-can-we-save-our-oceans-from-co2 | dead-url=yes }}
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* [http://www.nytimes.com/2012/05/01/science/new-studies-of-permian-extinction-shed-light-on-the-great-dying.html Life in the Sea Found Its Fate in a Paroxysm of Extinction] April 30, 2012
* [http://i2i.loven.gu.se/AcidOcean/AcidOcean.htm Ocean acidification virtual lab] {{Webarchive|url=https://web.archive.org/web/20131007234411/http://i2i.loven.gu.se/AcidOcean/AcidOcean.htm |date=2013-10-07 }}
* [http://dels.nas.edu/Materials/Booklets/Ocean-Acidification/ Ocean Acidification: Starting with the Science] {{Webarchive|url=https://web.archive.org/web/20131203035836/http://dels.nas.edu/Materials/Booklets/Ocean-Acidification/ |date=2013-12-03 }}, a booklet from the Division on Earth & Life Studies of the [[United States National Research Council]] (released April 2011)
* [http://oceanacidification.nas.edu/ Ocean Acidification] {{Webarchive|url=https://web.archive.org/web/20130224071842/http://oceanacidification.nas.edu/ |date=2013-02-24 }}, a [[United States National Academy of Sciences]]/ National Research Council website that includes downloadable figures and interviews with ocean scientists
* [http://www.scientificamerican.com/article.cfm?id=ancient-ocean-acidification-intimates-long-recovery-from-climate-change Ancient Ocean Acidification Intimates Long Recovery from Climate Change], July 22, 2010
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* [http://www.huffingtonpost.com/philippe-cousteau/a-world-without-whales_b_254717.html A World Without Whales?] by [[Philippe Cousteau]], ''[[The Huffington Post]]''
* http://www.oceana.org/climate/solutions/oceana/acidtest/ {{Webarchive|url=https://web.archive.org/web/20090925215720/http://oceana.org/climate/solutions/oceana/acidtest |date=2009-09-25 }}, [[Oceana (non-profit group)|Oceana]]
* [http://www.stanford.edu/group/microdocs/acidocean.html The Acid Ocean] {{Webarchive|url=https://web.archive.org/web/20110604094904/http://www.stanford.edu/group/microdocs/acidocean.html |date=2011-06-04 }}, [[Stanford University]]
* Sea Change (Parts [http://apps.seattletimes.com/reports/sea-change/2013/sep/11/pacific-ocean-perilous-turn-overview/ One], [http://apps.seattletimes.com/reports/sea-change/2013/sep/11/alaska-crab-industry/ Two], and [http://apps.seattletimes.com/reports/sea-change/2013/sep/11/oysters-hit-hard/ Three]), ''[[The Seattle Times]]''
* [http://www.youtube.com/watch?v=55D8TGRsl4k&feature=related ''The Other {{chem|CO|2}} Problem''], an EPOCA-commissioned educational animation created by students from [[Ridgeway School, Plympton|Ridgeway School]], [[Plymouth]]
* [http://www.youtube.com/watch?v=5cqCvcX7buo ''Acid Test: The Global Challenge of Ocean Acidification''], by [[Natural Resources Defense Council]]
* [http://aseachange.net/ ''A Sea Change: Imagine a world without fish''] {{Webarchive|url=https://web.archive.org/web/20080609073108/http://www.aseachange.net/ |date=2008-06-09 }}, an award-winning documentary and related [[blog]] about ocean acidification
* [http://www.greenpeace.org/new-zealand/en/Multimedia/Videos/Ocean-Acidification-in-a-nutshell/ ''Ocean Acidification in a Nutshell''] {{Webarchive|url=https://web.archive.org/web/20110114213319/http://www.greenpeace.org/new-zealand/en/Multimedia/Videos/Ocean-Acidification-in-a-nutshell/ |date=2011-01-14 }}, by [[Greenpeace Aotearoa New Zealand]]
* [http://www.youtube.com/watch?v=m-1fcNnJzaY&feature=youtu.be Ocean Acidification: An Ecosystem Facing Dissolution] by GEOMAR I Helmholtz-Centre for Ocean Research Kiel
* [http://cdiac.ornl.gov/oceans/co2rprt.html CO2SYS] {{Webarchive|url=https://web.archive.org/web/20111014235319/http://cdiac.ornl.gov/oceans/co2rprt.html |date=2011-10-14 }}, a stand-alone [[executable]] (also available in a [http://www.ecy.wa.gov/programs/eap/models.html version for Microsoft Excel/VBA])
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