Ƙanƙarar Patagonian Sheet
Sheet ɗin Ƙanƙara na Patagonian babban ƙanƙara mai tsayi kuma kunkuntar takardar kankara wacce ke tsakiyar kudancin Andes wacce ta wanzu alokacin glaciation LlanquihueGilashin Ƙanƙara ya rufe dukan ƙasar Chile a kudancin Puerto Montt da yammacin Patagonia na Argentine.
Gilashin ƙanƙara ya wuce iyakar Andes zuwa Ajantina, amma saboda bushewar yanayi bai wuce tafkunan yau ba kamar Yagagtoo,Musters, da Colhue Huapi. Alokacin da yake ƙololuwa (kimanin shekaru 18,000-17,500 da suka wuce),takardar Ƙanƙara ta Patagonia ta rufe kusan 480,000. km² na ƙasa mai kiyasin girman ƙanƙara fiye da 500,000 km³,[1]wanda kusan kashi 4% ya kasance mai haske a yau acikin ɓangarorin biyu da aka sani da filayen kankara na Patagonia na Arewa da Kudancin.
Rage girman ƙanƙara ya bada gudummawa ga hawan tekun duniya na kusan mita 1.2.[1] Duk da haka, a lokacin farkon lokacin glacial a farkon Pleistocene Ƙanƙara ya mika zuwa gaɓar tekun Argentine na yau. Tare da kowane glaciation na gaba an san cewa ƙanƙara ta tsaya gaba da gaba zuwa yamma, tare da ɓacin rai koyaushe yana aiki a matsayin ƙaƙƙarfan abin da ke dakatar da yaɗuwar dusar ƙanƙara: anyi imanin cewa hazo gabas-yamma a lokacin glacial sun kasance ma fi tsayi fiye da na musamman. masu tsayi na Patagonia na yanzu.
Ba kamar Sheet ɗin Kankara na Laurentide ko kankara na Arewacin Turai ba, Rukunin Kankara na Patagonia bai haifar da ɓarna ko hasarar rayayyun halittu ba . Wannan shi ne saboda flora da suka rage zuwa arewacin ƙanƙara sun keɓanta da Desert Atacama kuma sun sami damar yin bayani da sauƙi a duk inda microclimates masu dacewa suka faru. A gaskiya ma, yawancin tsire-tsire na Antarctic na asali suna rayuwa a yau a kan ƙasar da kankara ta mamaye. Duk da haka, akwai alamun cewa a lokacin lalatawar ƙarshe (shekaru 17,500 da suka wuce), saurin narkewar narkar da iyakar arewa na ƙanƙara na Patagonian Ice Sheet ya haifar da sakin ruwa mai ban mamaki zuwa tekun da ke kusa da shi, yana rage gishirinsa[2] da kuma canza wurare dabam dabam., yana haifar da gagarumin canje-canjen muhalli a gida da kuma nesa.[3]
Manazarta[gyara sashe | gyara masomin]
- ↑ 1.0 1.1 Hulton, N.R.J., R.S. Purvesa, R.D. McCullocha, D.E. Sugdena, M.J. Bentleyb. 2002. The Last Glacial Maximum and eglaciation in southern South America. Quaternary Science Reviews, vol. 21, 233–241
- ↑ Lamy, F., J. Kaiser, U. Ninnemann, D. Hebbeln, H. W. Arz, J. Stoner. 2004. Antarctic Timing of Surface Water Changes off Chile and Patagonian Ice Sheet Response. Science, vol. 304, 1959-1962
- ↑ De Pol-Holz, R., O. Ulloa, L. Dezileau, J. Kaiser, F. Lamy and D. Hebbeln. 2006. Melting of the Patagonian Ice Sheet and deglacial perturbations of the nitrogen cycle in the eastern South Pacific. Geophysical Research Letters, vol. 33, L04704, doi:10.1029/2005GL024477
Duba kuma[gyara sashe | gyara masomin]
- Zancen kankara
- Filin Kankara na Arewacin Patagonia
- Filin Kankara na Kudancin Patagonia
- Katalalixar National Reserve
- Geography na Argentina
- Geography na Chile