Yanayin horse

**latitudes na horse** sune latitudes game da digiri 30 a arewa da kudu na ma'auni. Ana nuna su da sararin samaniya mai haske, iska mai natsuwa, da kuma karancin hazo. An kuma san su da tuddai na subtropical ko highs. Yankin matsin lamba ne a bambancin iskar kasuwanci da yamma.

## Magana
Bayani mai yiwuwa kuma an rubuta shi ne cewa kalmar ta samo asali ne daga al'adar "mutuwar doki" na ma'aikatan jirgin ruwa (duba Kashe doki mai mutuwa). A cikin wannan aikin, mai tuƙin jirgin ruwa ya nuna siffar doki mai cike da ciyawar a kusa da bene kafin ya jefa shi a cikin jirgin. An biya ma'aikatan jirgin ruwa wani bangare kafin tafiya mai tsawo, kuma galibi suna amfani da albashinsu a lokaci guda, wanda ya haifar da wani lokaci ba tare da samun kudin shiga ba. Wannan lokacin ana kiransa lokacin "mutuwar doki", kuma yawanci yana ɗaukar wata ɗaya ko biyu. Bikin mai tuƙi shine don yin bikin bayan ya yi aiki daga bashin "mutuwar doki". Kamar yadda jigilar kaya daga yamma daga Turai yawanci ya kai ga subtropics a kusan lokacin da aka yi aiki da "mutuwar doki", latitude ya zama mai alaƙa da bikin.

Wani madadin ka'idar, na isasshen shahara don zama misali na ilimin gargajiya, shine cewa kalmar *latitudes na doki* ta samo asali ne daga lokacin da Mutanen Espanya suka kai dawakai ta jirgin ruwa zuwa yankunansu a West Indies da Amurka. Jiragen ruwa sau da yawa sun kwanta a tsakiyar teku a cikin wannan latitude, don haka suna tsawaita tafiyar sosai; sakamakon karancin ruwa ya sa ba zai yiwu ma'aikatan su ci gaba da rayayyun dawakai ba, kuma za su jefa matattu ko dabbobi masu mutuwa a cikin jirgin.

Bayani na uku, wanda a lokaci guda ya bayyana duka arewa da kudancin latitudes kuma bai dogara da tsawon tafiyar ko tashar jiragen ruwa ba, ya dogara ne akan kalmomin teku: an ce jirgin yana da 'horsed' lokacin da, kodayake babu isasshen iska don jirgin ruwa, jirgin zai iya samun ci gaba mai kyau ta hanyar kulle zuwa ga halin yanzu mai ƙarfi. Edward Taube ne ya ba da shawarar wannan a cikin labarinsa "The Sense of 'Horse' in the Horse Latitudes". Ya yi jayayya da amfani da 'doki' a cikin teku ya bayyana jirgin da ake ɗauka ta hanyar teku ko ruwa a cikin hanyar mahayin da ke kan doki. An yi amfani da kalmar tun daga ƙarshen karni na sha bakwai. Bugu da ƙari, The India Directory a cikin shigarwa ga Fernando na Noronha, tsibirin da ke bakin tekun Brazil, ya ambaci cewa jiragen ruwa sun ziyarta akai-akai "sun faru da raƙuman ruwa da suka kai su yamma".

Wani ƙarin bayani shi ne cewa wannan suna ya fara bayyana a cikin fassarar Turanci na wani littafin Jamus  inda aka fahimci *Rossbreiten* ba daidai ba kamar *Pferdbreiten* . Sunan 'Ross latitudes' an yi su ne da sunan Bature wanda ya fara kwatanta su amma ana iya fassara su da kuskure, kamar yadda *Pferd* da *Ross* ke ma'anar ma'anar doki na Jamusanci. Don haka fassarar da ba daidai ba ta iya haifar da kalmar "latitudes doki".

## Kafawa
Rashin dumama na duniya a ma'aunin zafi yana haifar da adadi mai yawa na convection tare da Yankin Haɗuwa na Intertropical. Wannan iska tana tashi sannan ta rabu, tana motsawa daga ma'auni a bangarorin arewa da kudu. Yayin da iska ke motsawa zuwa tsakiyar latitudes a bangarorin biyu na ma'auni, yana sanyaya kuma yana nutsewa. Wannan yana haifar da matsin lamba a kusa da layi na 30 a cikin sassan biyu. A matakin farfajiyar, iska mai nutsewa ta sake bambanta tare da wasu dawowa zuwa ma'auni, suna haifar da sel na Hadley  wanda a lokacin rani ana ƙarfafa shi da wasu hanyoyin yanayi kamar su Rodwell-Hoskins.  Yawancin hamada na duniya sun samo asali ne daga waɗannan yankuna masu matsin yanayi.

Yankin subtropical yana motsawa zuwa pole a lokacin rani, yana kaiwa mafi girman latitude a farkon kaka, kafin ya koma baya a lokacin sanyi. El Niño-Southern Oscillation (ENSO) na iya kawar da tudun arewacin arewa, tare da La Niña yana ba da izinin arewacin arewacin tudun, yayin da El Niños ke nuna shimfiɗa, mafi kudancin tudun. Canjin matsayi na tsaunuka a lokacin zagaye na ENSO yana canza waƙoƙin Guguwa ta wurare masu zafi waɗanda ke kewaye da ma'auni da yammacin su. Kamar yadda tudun subtropical ya bambanta a matsayi da ƙarfi, yana iya haɓaka ko rage tsarin mulkin ruwan sama a kusa da ƙananan iyakokinsu.

## Manazarta