Firn
 Firn | |
|---|---|
type of mixture of chemical entities (en)  | |
 | |
| Bayanai | |
| Ƙaramin ɓangare na | snow (en) |
| Mabiyi | Nevévé |
firn wani ɓangare ne na névé, wani nau'in dusar ƙanƙara wanda aka bar daga lokutan da suka gabata kuma an sake shi cikin wani abu mai yawa fiye da névé. Yana da kankara wanda yake a matsakaici tsakanin dusar ƙanƙara da kankara.[1] Firn yana da bayyanar sukari mai laushi, amma yana da tsananin da ke sa ya yi tsayayya da shovelling. Yawansa gabaɗaya ya kasance daga 0.3 g / cm3 zuwa 0.9 g / cm3, [1] kuma ana iya samun sa a ƙarƙashin dusar ƙanƙara da ke tarawa a kan kan kankara.[2]
Ana matse dusar ƙanƙara a ƙarƙashin nauyin dusar ƙara da ke sama. Kowane lu'ulu'u kusa da ma'aunin narkewa suna da tsaka-tsaki kuma suna da santsi, suna ba su damar zamewa tare da wasu jiragen lu'ulu-lu'u kuma su cika sarari tsakanin su, suna ƙara yawan kankara. Inda lu'ulu'u suka taɓa, suna haɗuwa tare, suna matse iska tsakanin su zuwa farfajiya ko cikin kumfa.
A cikin watanni na rani, metamorphosis na crystal na iya faruwa da sauri saboda ruwa mai shiga tsakanin lu'ulu'u. A ƙarshen lokacin rani, sakamakon ya cika.
Mafi ƙarancin tsawo da firn ke tarawa a kan kankara ana kiransa iyakar firn, layin firn ko layin dusar ƙanƙara.
Jerin firns
[gyara sashe | gyara masomin]- Antarctic Firn[1][3]
- Daniel Bruun Firn[4]
- Dreyer Firn[5]
- Gabashin Arewacin Firn
- Rink Firn
- Sven Hedin Firn
- Yammacin Arewacin Firn
Sauran amfani
[gyara sashe | gyara masomin]A cikin harshe na magana da fasaha, ana amfani da "firn" don bayyana wasu nau'ikan tsohuwar dusar ƙanƙara, gami da:
- tsoffin filayen dusar ƙanƙara, waɗanda aka sani da Firnfelder (lit. ' filayen wuta'), koda kuwa dusar ƙara ba ta da shekara ɗaya
- mafi yawan dusar ƙanƙara na kwanan nan na matsakaici, ko "ƙonewa", kankaradutsen kankara
- An yi amfani da shi a cikin tseren kankara, mafi girma, mai laushi na dusar ƙanƙara wanda aka daskare da dare kuma, sakamakon hasken rana na bazara da yanayin iska mai zafi, yana narkewa da gyare-gyare a yankin tsohuwar dusar ƙara ko harsch (lit. 'harsh', yana nufin ƙarancin dusar ƙarancin ƙanƙarar)
Kamar yadda yake a cikin mahallin na ƙarshe, wani gangaren kankara wanda ke fuskantar narkewa da sake sanyaya cikin harsch an ce ya "farka". A Switzerland, ana kiran waɗannan gangaren Sulz, amma a Jamus, Sulz sau da yawa yana nufin zurfin da tseren kankara ba shi da kyau.
Manazarta
[gyara sashe | gyara masomin]- 1 2 3 van den Broeke, Michiel (1 May 2008). "Depth and Density of the Antarctic Firn Layer". Arctic, Antarctic, and Alpine Research. 40 (2): 432–438. doi:10.1657/1523-0430(07-021)[BROEKE]2.0.CO;2. ISSN 1523-0430. S2CID 198156588.
- ↑ Stan Paterson. Missing
|author1=(help); Missing or empty|title=(help)[page needed] - ↑ Veldhuijsen, Sanne; Van De Berg, Willem Jan; Brils, Max; Kuipers Munneke, Peter; van den Broeke, Michiel (1 December 2021). "Contemporary Characteristics of the Antarctic Firn Layer (1979-2020)". AGU Fall Meeting Abstracts. 2021: C35E–0919. Bibcode:2021AGUFM.C35E0919V.
- ↑ "DanielBruun Firn". Mapcarta. Retrieved 31 May 2019.
- ↑ "Dreyer Firn". Mapcarta. Retrieved 31 May 2019.
