Peristiwa 8,2 kilo-warsa

Pada klimatologi, peristiwa 8,2 kilo-warsa merujuk kepada penurunan temperatur global secara mendadak yang dimulai sekitar 8,200 tahun sebelum sekarang, atau ca 6,200 SM, yang berlangsung selama dua hinngga empat abad. Peristiwa ini mendefinisikan dimulainya sub-kala Northgrippium dari kala Holosen. Pendinginan ini tidak separah periode dinginDryas Terkini yang terjadi sebelum dimulainya Holosen. Saat peristiwa ini berlangsung, konsentrasi metana di atmosfer menurun hingga 80 bagian per miliar dan pengurangan emisi sebanyak 15% yang disebabkan oleh pendinginan dan pengeringan dalam skala hemisferik.^[2]

Peristiwa ini kemungkinan terjadi karena pulsa air leleh besar dari runtuhnya Lapisan es Laurentide di Amerika Utara barat daya,^[3]^[4]^[5] kemungkinan besar saat danau glasial Ojibay dan Agassiz secara mendadak terkuras ke Samudera Atlantik Utara.^[6]

Referensi

^ Zalloua, Pierre A.; Matisoo-Smith, Elizabeth (6 January 2017). "Mapping Post-Glacial expansions: The Peopling of Southwest Asia". Scientific Reports (dalam bahasa Inggris). 7: 40338. Bibcode:2017NatSR...740338P. doi:10.1038/srep40338. ISSN 2045-2322. PMC 5216412 . PMID 28059138.
^ Kobashi, T.; et al. (2007). "Precise timing and characterization of abrupt climate change 8,200 years ago from air trapped in polar ice". Quaternary Science Reviews. 26 (9–10): 1212–1222. Bibcode:2007QSRv...26.1212K. CiteSeerX 10.1.1.462.9271 . doi:10.1016/j.quascirev.2007.01.009.
^ Ellison, Christopher R. W.; Chapman, Mark R.; Hall, Ian R. (2006). "Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago". Science. 312 (5782): 1929–32. Bibcode:2006Sci...312.1929E. doi:10.1126/science.1127213. PMID 16809535.
^ Matero, I.S.O.; Gregoire, L.J.; Ivanovic, R.F. (2017). "The 8.2 ka Cooling event caused by Laurentide Ice Saddle Collapse". Earth and Planetary Science Letters. 473 (5782): 205–214. Bibcode:2017E&PSL.473..205M. doi:10.1016/j.epsl.2017.06.011 .
^ Ehlers, Jürgen; Gibbard, Philip L. (2004). Quaternary Glaciations – Extent and Chronology. Part II: North America. Amsterdam: Elsevier. hlm. 257–262. ISBN 978-0-444-51592-6.
^ Barber, D. C.; et al. (1999). "Forcing of the cold event 8,200 years ago by catastrophic drainage of Laurentide Lakes". Nature. 400 (6742): 344–8. Bibcode:1999Natur.400..344B. doi:10.1038/22504.

[1] Zalloua, Pierre A.; Matisoo-Smith, Elizabeth (6 January 2017). "Mapping Post-Glacial expansions: The Peopling of Southwest Asia". Scientific Reports (dalam bahasa Inggris). 7: 40338. Bibcode:2017NatSR...740338P. doi:10.1038/srep40338. ISSN 2045-2322. PMC 5216412 . PMID 28059138.

[Kobashi-2] Kobashi, T.; et al. (2007). "Precise timing and characterization of abrupt climate change 8,200 years ago from air trapped in polar ice". Quaternary Science Reviews. 26 (9–10): 1212–1222. Bibcode:2007QSRv...26.1212K. CiteSeerX 10.1.1.462.9271 . doi:10.1016/j.quascirev.2007.01.009.

[3] Ellison, Christopher R. W.; Chapman, Mark R.; Hall, Ian R. (2006). "Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago". Science. 312 (5782): 1929–32. Bibcode:2006Sci...312.1929E. doi:10.1126/science.1127213. PMID 16809535.

[:0-4] Matero, I.S.O.; Gregoire, L.J.; Ivanovic, R.F. (2017). "The 8.2 ka Cooling event caused by Laurentide Ice Saddle Collapse". Earth and Planetary Science Letters. 473 (5782): 205–214. Bibcode:2017E&PSL.473..205M. doi:10.1016/j.epsl.2017.06.011 .

[5] Ehlers, Jürgen; Gibbard, Philip L. (2004). Quaternary Glaciations – Extent and Chronology. Part II: North America. Amsterdam: Elsevier. hlm. 257–262. ISBN 978-0-444-51592-6.

[6] Barber, D. C.; et al. (1999). "Forcing of the cold event 8,200 years ago by catastrophic drainage of Laurentide Lakes". Nature. 400 (6742): 344–8. Bibcode:1999Natur.400..344B. doi:10.1038/22504.

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