Glaciers periodically retreat or advance, nyob ntawm seb cov daus puas los yog evaporation los yog yaj uas tshwm sim. Qhov kev thim rov qab thiab ua ntej no tsuas yog hais txog txoj haujlwm ntawm lub terminus, lossis snout, ntawm glacier. Txawm tias thaum nws rov qab los, cov dej khov tseem deforms thiab txav mus rau qhov chaw qis, zoo li siv txoj siv sia.
Yuav ua li cas koj thiaj paub yog tias lub qhov dej khov nce mus lossis thim rov qab?
4 Teb. Txoj kev yooj yim tshaj plaws yog saib cov ntug dej hiav txwv. Yog hais tias cov dej khov nyob rau hauv kev sib cuag nrog cov nroj tsuag los yog pob zeb nyob rau hauv lichens los yog moss, nws txhais tau tias nws yog feem ntau yuav nce mus. Yog koj pom ib pawg ntawm lub neej-tsawg pob zeb nyob nruab nrab ntawm cov dej khov thiab thawj cov nroj tsuag / lichens / moss, txhais tau tias nws rov qab.
Yuav ua li cas glacier nce mus es tsis txhob thim rov qab?
Lub Peb Hlis, ib pab neeg tshawb fawb uas NASA tau tshaj tawm tias Jakobshavn Isbrae, Greenland qhov nrawm tshaj plaws-ntws thiab thinning glacier dhau ob xyoo dhau los, tam sim no ntws qeeb dua, thickening thiab nce mus rau hauv dej hiav txwv es tsis txhob thim rov qab mus rau hauv av. Ntawm qhov chaw, lub suab zoo li xov xwm zoo.
Puas dej khov nce lossis txo qis?
Cov dej khov thoob ntiaj teb yog melting, thim rov qab thiab txawm ploj mus tag nrho. Tab sis nyob rau hauv roob Karakoram cheeb tsam ntawm Asia - lub tsev rau K2, lub thib ob-siab tshaj plaws ncov nyob rau hauv lub ntiaj teb no - lub glaciers tsis melting. Yog tias muaj dab tsi, qee qhov nthuav dav. Tam sim no, cov kws tshawb fawb tau pom ib qho kev piav qhia rau qhov tsis meej pem noglacial stability.
Puas yog qhov dej khov rov qab?
Ib lub glacier retreats thaum nws lub davhlau ya nyob twg tsis txuas mus deb li nram hav zoo li nws yav tas los ua. Glaciers yuav thim rov qab thaum lawv cov dej khov yaj los yog ablates sai dua li cov daus tuaj yeem sib sau thiab tsim cov dej khov tshiab.
