Lofoten Vortex
 Lofoten Vortex | |
|---|---|
| Ruwa na yanzu | |
 | |
| Bayanai | |
| Wuri a ina ko kusa da wace teku |
Norwegian Sea (en)  |
Lofoten Vortex, wanda kuma ake kira Lofoten Basin Vortex ko Lofoten Basin Eddy, wani yanki ne na dindindin na anticyclonic na teku, wanda yake a arewacin Tekun Norwegian, kusa da bakin tekun Lofoten tsibiri. An rubuta shi a karon farko a cikin shekarun 1970.[1]
Saboda kasancewar vortex na dindindin, kwandon Lofoten yana fasalta wani yanki da aka keɓe tare da matakan zafin saman teku da kuzarin motsa jiki. Gudun ruwa na cikin gida da ke cikin vortex da ƙwanƙwasa mai ƙarfi da aka gani a lokacin hunturu suna haifar da wuri mai zafi mai wadatar abinci mai gina jiki, yana shafar ilimin halittun ruwa da ke kewaye.
Haka kuma, saboda tsayin daka da wurinsa na ban mamaki, Lofoten Vortex na iya yin tasiri ga samuwar ruwa mai yawa a yankin.[2]
Kaddarorin jiki
[gyara sashe | gyara masomin]Basin Lofoten wani ƙayyadadden ƙayyadaddun yanayin yanayi ne na zurfin zurfin zurfin mita 3250, yana tsakanin gangaren nahiyar Norway a gabas, Plateau Vøring da Helgeland Ridge a kudu da kudu maso yamma, da Mohn Ridge a arewa maso yamma. Haɗin tsarin bathymetric yana da mahimmanci don gano manyan magudanan ruwa guda biyu na kwandon:
Ruwan Tekun Atlantika na Yaren mutanen Norway na yanzu (NwASC), wanda ke gudana kudu-arewa duk tare da kan iyaka na Norway;
Ƙasar Norwegian Atlantic Front Current (NwAFC), wanda ke gudana kusan daidai da gangaren halin yanzu, amma a gefen yamma na Vøring Plateau sannan tare da Mohn Ridge.
Waɗannan igiyoyin ruwa suna taka muhimmiyar rawa a cikin hanyoyin da ke ba da tabbacin dagewar Lofoten Vortex.
An keɓance vortex a cikin mafi zurfin ɓangaren Lofoten Basin. Yana da bayyananniyar eddy na anticyclonic na dindindin, wanda aka rubuta dagewarsa a cikin shekarun da suka gabata ta hanyar jirgin ruwa, Seagliders da ma'aunin tauraron dan adam.
Matsakaicin radius na vortex shine 15-20 km kuma yana gabatar da 1200 m kauri na ruwa na Atlantic Water (dumi da saline) yana jujjuyawa a cikin saurin da ya kai 0.8 m / s a zurfin 600-800 m. Tsarin saurin yana kama da vortex na Rankine, wanda ke da saurin raguwar saurin azimuthal.
RAFOS masu yawo a cikin tsakiyar Lofoten Vortex sun bayyana cewa cibiyar vortex ta yi tafiya mai nisan kilomita 1850 a cikin watanni 15, tare da matsakaicin saurin gudu daga 1 zuwa 5 km / day, amma tare da kololuwar ya kai kilomita 15 a rana. Daga waɗannan ma'aunai, ana gano gangara gabaɗaya da motsi na jujjuyawar kusa da mafi zurfin ɓangaren Lofoten Basin.
Daga bayanan martabar salinity da zafin jiki yana yiwuwa a ga cewa hydrography na ciki na vortex yana da tsarin lens mai ma'ana biyu. Doming isotherms, sama a kusa da 200 m kuma zuwa ƙasa a kusan zurfin 600 m, ana iya gani a madaidaicin bayanin yanayin zafin jiki. Wannan tsari ya bayyana cewa zurfin Lofoten Basin babban wurin da ake hada ruwa ne a cikin Tekun Nordic, musamman a lokacin hunturu: a cikin Lofoten Vortex, Ruwan Atlantika yana ratsa zurfin har zuwa zurfin mita 800, zurfin zurfi fiye da kowane wuri na teku guda.
Matsakaicin yanayi mai ƙarfi yana nuna ƙimar ƙimar vortex: a lokacin rani ana iya gano tsarin tushe guda biyu, tare da pycnocline mara zurfi wanda aka ƙirƙira ta hanyar rarrabuwar ruwa mai zafi da rana. A gefe guda kuma, a cikin hunturu sanyin saman yana haifar da haɓaka mai ƙarfi wanda ke daidaita bayanin martaba kuma yana zurfafa pycnocline har zuwa zurfin mita 1200.[3]
Sa hannun saman saman da bin sawu
[gyara sashe | gyara masomin]Lofoten Vortex yana da siffofi guda biyu waɗanda ke da amfani don gano ta.
Na farko, akan taswirar yanayin zafin teku (SST), ana iya gane vortex a matsayin mummunan SST anomaly. Sa hannun saman sanyi, duk da haka, ba za a iya gano shi ta hanyar bayanan tauraron dan adam akai-akai ba, saboda haka ba a saba magana da shi azaman ingantaccen hanyar sa ido ba.
Kasancewa tsarin anticyclonic, Lofoten Vortex za'a iya yin nazari a maimakon haka azaman ingantaccen matakin teku (SLA). Tauraron tauraron dan adam da ke auna SLA ya ba da haske game da wanzuwar vortex a cikin 83% na abubuwan da ke akwai, tare da tsawon rayuwa daga kwanaki 90 har zuwa sama da shekara guda. Vortex mafi dadewa da aka yi rajista ya kasance tsawon shekaru biyu, daga Mayu 2002 zuwa Afrilu 2004.
Ya zama dole a nuna cewa a cikin lokaci tsakanin vortices guda biyu da aka gano, ba shi da tabbas idan vortex ya ɓace ko kawai ba a gano ba. Wannan na iya zama lamarin lokacin da vortex ɗin ya ɗauki tsarin tsarin ƙasa, tare da SLA mara iya ganewa.
Manazarta
[gyara sashe | gyara masomin]- ↑ Bosse, Anthony; Fer, Ilker; Lilly, Jonathan M.; Søiland, Henrik (2019-09-17). "Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy". Scientific Reports. 9 (1): 13448. Bibcode:2019NatSR...913448B. doi:10.1038/s41598-019-49599-8. ISSN 2045-2322. PMC 6748989. PMID 31530826.
- ↑ Issufo, Raj, Roshin P. Chafik, Leon Nilsen, J. Even O. Eldevik, Tor Halo (2015). The Lofoten Vortex of the Nordic Seas. Stockholms universitet, Meteorologiska institutionen (MISU). OCLC 1234953657
- ↑ Trodahl, Marta; Isachsen, Pål Erik; Lilly, Jonathan M.; Nilsson, Johan; Kristensen, Nils Melsom (2020-09-01). "The Regeneration of the Lofoten Vortex through Vertical Alignment". Journal of Physical Oceanography. 50 (9): 2689–2711. Bibcode:2020JPO....50.2689T. doi:10.1175/jpo-d-20-0029.1. hdl:10852/96620. ISSN 0022-3670. S2CID 225287331.