Taron shekara 8.2-kilo
 Taron shekara 8.2-kilo | |
|---|---|
| Canjin yanayi na gaggawa | |
| Bayanai | |
| Kwanan wata | 62 century "BCE" |
Has characteristic (en)  | temperature |
A cikin ilimin yanayi, taron kiloyear 8.2 ya kasance saurin raguwa a yanayin zafi na duniya wanda ya faru a kusa da shekaru 8,200 da suka gabata, wanda ya kasance tsakanin ƙarni biyu zuwa huɗu. Wannan taron ya nuna farkon zamanin Arewacin Girbiya a cikin zamanin Holocene. Duk da yake wannan lokacin sanyaya ba shi da ƙarfi kamar lokacin Younger Dryas na farko wanda ya faru kafin Holocene ya fara, har yanzu yana da mahimmanci. A lokacin Taron kilo-shekara 8.2, matakan methane na yanayi sun ragu da kashi 80 a kowace biliyan, raguwar 15%, yana ba da shawarar yanayin sanyaya da bushewa a duk faɗin Arewacin Hemisphere.
Bayyanawa
[gyara sashe | gyara masomin]Wani mai saurin sanyi a kusa da shekaru 8,200 da suka wuce ya fara gano shi ta hanyar masanin ilimin halittu na Swiss Heinrich Zoller a cikin 1960, wanda ya kira taron Misox oscillation na Val Mesolcina . [1] Ana kuma san shi da taron Finse a Norway . [2] an samu shedar taron kilo-shekara 8.2 a cikin kididdigar tatsuniyoyi a fadin Eurasia, Bahar Rum, Kudancin Amirka, da Kudancin Afirka, wanda ke nuni da cewa taron ya yi daidai da duniya . [3] Shaida mafi ƙarfi ga taron ta fito ne daga yankin Arewacin Atlantic ; Rushewar yanayi yana nunawa a fili a cikin ƙananan ƙanƙara na Greenland, bayanan sedimentary, da sauran bayanan yanayin yanayi da na wurare masu zafi na Arewacin Atlantika. [4] [5] [6] Akwai ƙarancin shaida a cikin ƙananan kankara daga bayanan Antarctica da Kudancin Amurka. [7] Sakamakon raguwar zafin jiki ba zato ba tsammani ya kasance na duniya, musamman canjin yanayin teku.
Abin da ya faru na sanyaya
[gyara sashe | gyara masomin]Lamarin na iya haifar da babban bugun ruwa mai narkewa, [8] wanda mai yiwuwa ya samo asali ne daga rugujewar karshe na Laurentide Ice Sheet na arewa maso gabashin Amurka ta Arewa, [9] [10] mai yiwuwa lokacin da tafkunan glacial Ojibway da Agassiz suka shiga cikin Arewacin Tekun Atlantika. [11] Irin wannan aikin ya haifar da ambaliya ta Missoula wadda ta kafa Channeled Scablands na Kogin Columbia . Ruwan narkewar ruwa na iya shafar yanayin yanayin zafi na Arewacin Atlantika, [12] [13] [14] yana rage jigilar zafi na arewa a cikin Tekun Atlantika kuma yana haifar da sanyayawar Arewacin Atlantic. [15] Tsarin jujjuyawar juzu'i na meridional na Atlantic (AMOC) ya raunana da 55% [10] ko 62%. [15] Ƙididdiga na sanyaya sun bambanta kuma sun dogara kaɗan akan fassarar bayanan wakili, amma raguwa na kusan 1 to 5 °C (1.8 to 9.0 °F) an ruwaito. A Greenland, taron ya fara a 8175 BP, kuma sanyaya ya kasance 3.3 ° C a ƙasa da matsakaicin matsakaici a cikin ƙasa da shekaru 20. Mafi yawan lokacin sanyi ya kasance kusan shekaru 60, kuma tsawon lokacinsa shine kusan shekaru 150. [16] Hasashen sanadin narkewar ruwa shine, duk da haka, ana ɗaukarsa hasashe ne. saboda rashin daidaituwa tare da farawa da kuma yankin da ba a sani ba na tasiri.
Manazarta
[gyara sashe | gyara masomin]- ↑ Zoller, Heinrich (1960). "Pollenanalytische Untersuchungen zur Vegetationsgeschichte der insubrischen Schweiz". Denkschriften der Schweizerischen Naturforschenden Gesellschaft (in Jamusanci). 83: 45–156. ISSN 0366-970X.
- ↑ Nesje, Atle; Dahl, Svein Olaf (2001). "The Greenland 8200 cal. yr BP event detected in loss-on-ignition profiles in Norwegian lacustrine sediment sequences". Journal of Quaternary Science. 16 (2): 155–166. Bibcode:2001JQS....16..155N. doi:10.1002/jqs.567. S2CID 130276390.
- ↑ Parker, Sarah E.; Harrison, Sandy P. (22 June 2022). "The timing, duration and magnitude of the 8.2 ka event in global speleothem records". Scientific Reports. 12 (1): 10542. Bibcode:2022NatSR..1210542P. doi:10.1038/s41598-022-14684-y. PMC 9217811 Check
|pmc=value (help). PMID 35732793 Check|pmid=value (help). - ↑ Alley, R. B.; et al. (1997). "Holocene climatic instability; a prominent, widespread event 8,200 yr ago". Geology. 25 (6): 483–486. Bibcode:1997Geo....25..483A. doi:10.1130/0091-7613(1997)025<0483:HCIAPW>2.3.CO;2.
- ↑ Alley, Richard B.; Ágústsdóttir, Anna Maria (2005). "The 8k event: cause and consequences of a major Holocene abrupt climate change". Quaternary Science Reviews. 24 (10–11): 1123–1149. Bibcode:2005QSRv...24.1123A. doi:10.1016/j.quascirev.2004.12.004. Retrieved 18 September 2023.
- ↑ Sarmaja-Korjonen, Kaarina; Seppa, H. (2007). "Abrupt and consistent responses of aquatic and terrestrial ecosystems to the 8200 cal. yr cold event: a lacustrine record from Lake Arapisto, Finland". The Holocene. 17 (4): 457–467. Bibcode:2007Holoc..17..457S. doi:10.1177/0959683607077020. S2CID 129281579.
- ↑ Ljung, K.; et al. (2007). "South Atlantic island record reveals a South Atlantic response to the 8.2kyr event". Climate of the Past. 4 (1): 35–45. doi:10.5194/cp-4-35-2008.
- ↑ You, Defang; Stein, Ruediger; Fahl, Kirsten; Williams, Maricel C.; Schmidt, Daniela N.; McCave, Ian Nicholas; Barker, Stephen; Schefuß, Enno; Niu, Lu; Kuhn, Gerhard; Niessen, Frank (17 March 2023). "Last deglacial abrupt climate changes caused by meltwater pulses in the Labrador Sea". Communications Earth & Environment (in Turanci). 4 (1): 81. Bibcode:2023ComEE...4...81Y. doi:10.1038/s43247-023-00743-3. ISSN 2662-4435.
- ↑ 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): 1929–1932. Bibcode:2006Sci...312.1929E. doi:10.1126/science.1127213. PMID 16809535. S2CID 42283806.
- ↑ 10.0 10.1 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.
- ↑ Barber, D. C.; et al. (1999). "Forcing of the cold event 8,200 years ago by catastrophic drainage of Laurentide Lakes". Nature. 400 (6742): 344–348. Bibcode:1999Natur.400..344B. doi:10.1038/22504. S2CID 4426918.
- ↑ Kleiven, Helga (Kikki) Flesche; Kissel, Catherine; Laj, Carlo; Ninnemann, Ulysses S.; Richter, Thomas O.; Cortijo, Elsa (4 January 2008). "Reduced North Atlantic Deep Water Coeval with the Glacial Lake Agassiz Freshwater Outburst". Science (in Turanci). 319 (5859): 60–64. Bibcode:2008Sci...319...60K. doi:10.1126/science.1148924. ISSN 0036-8075. PMID 18063758. S2CID 38294981.
- ↑ Wiersma, A. P.; Renssen, H. (January 2006). "Model–data comparison for the 8.2kaBP event: confirmation of a forcing mechanism by catastrophic drainage of Laurentide Lakes". Quaternary Science Reviews (in Turanci). 25 (1–2): 63–88. Bibcode:2006QSRv...25...63W. doi:10.1016/j.quascirev.2005.07.009. Retrieved 2 September 2023.
- ↑ Wanner, H.; Mercolli, L.; Grosjean, M.; Ritz, S. P. (17 October 2014). "Holocene climate variability and change; a data-based review". Journal of the Geological Society (in Turanci). 172 (2): 254–263. doi:10.1144/jgs2013-101. ISSN 0016-7649. S2CID 73548216. Retrieved 18 September 2023.
- ↑ 15.0 15.1 Aguiar, Wilton; Meissner, Katrin J.; Montenegro, Alvaro; Prado, Luciana; Wainer, Ilana; Carlson, Anders E.; Mata, Mauricio M. (9 March 2021). "Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting". Scientific Reports. 11 (1): 5473. Bibcode:2021NatSR..11.5473A. doi:10.1038/s41598-021-84709-5. PMC 7943769. PMID 33750824 Check
|pmid=value (help). - ↑ 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.