Sararin Samaniya na Duniya

**Sararin samaniyar duniya**, wanda aka fi sani da **[[iska]]**, shi ne iskar gas din dake rike da karfin duniya wanda ke kewaye da duniyar kuma ya samar da yanayin ta na duniya. Yanayin duniya yana kare rayuwa a doron kasa ta hanyar haifar da matsin lamba wanda ke ba da damar ruwa mai dorewa ya kasance a farfajiyar duniya, yana daukar hasken rana na ultraviolet, yana dumama farfajiyar, ta hanyar rike zafi ( tasirin greenhouse ), da rage matsanancin zafin rana, tsakanin dare da rana ( zafin rana. bambancin).°

Ta karar, busasshiyar iska ta kunshi 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, da kananan gas.  Har ila yau, iska tana kunshi da adadin tururin ruwa, a matsakaita kusan kashi 1% a matakin teku, da 0.4% akan sararin samaniya. Hadin iska, zafin jiki, da matsin yanayi suna bambanta da tsayi. A cikin yanayi, iska dace da amfani a photosynthesis da terrestrial shuke-shuke da kuma numfashi na nazarin sasannin dabbobi ke samuwa ne kawai a Duniya ta troposphere 

Farkon yanayin duniya ya kunshi iskar gas a cikin lamura na rana, da farko hydrogen. Yanayin ya canza sosai a tsawon lokaci, wanda abubuwa da yawa suka shafa kamar volcanism, rayuwa, da yanayi. Kwanan nan, ayyukan dan adam shima ya ba da gudummawa ga canje -canjen yanayi, kamar gudumar yanayi, raguwar ozone da zubar da asid.

Yanayin yana da taro kusan 5.15 ×  &nbsp;kg,  kwata -kwata uku yana cikin kusan  na farfajiya. Yanayin ya zama siriri tare da kara tsayi, ba tare da takamaiman iyaka tsakanin yanayin da sararin samaniya ba . Layin Kármán, a  ko 1.57% na radius na Duniya, galibi ana amfani dashi azaman kan iyaka tsakanin sararin samaniya da sararin samaniya. Ana iya lura da tasirin yanayi yayin sake shigar sararin samaniya a sararin sama kusan . Ana iya rarrabe yadudduka da yawa a cikin yanayi, dangane da halaye kamar zafin jiki da abun da ke ciki.

Nazarin yanayin duniya da hanyoyinsa ana kiranta kimiyyar yanayi (aerology), kuma ya kunshi filayen subfields da yawa, kamar canjin yanayi da kimiyyar sararin samaniya. Majagaba na farko a fagen sun hada da Léon Teisserenc de Bort da Richard Assmann. Nazarin yanayi mai tarihi ana kiransa paleoclimatology .

## Abun da ke ciki
 

Manyan abubuwa guda uku na sararin duniya sune nitrogen, oxygen, da argon . Tururin ruwa yana lissafin kusan 0.25% na sararin samaniya ta hanyar taro. Hadin tururin ruwa (iskar gas) ya bambanta sosai daga kusan 10 ppm ta karar a cikin mafi karancin yanayin yanayi zuwa 5% da kima a cikin zafi mai zafi, da iska mai yawa, da kuma yawan sauran iskar gas. sharud busasshiyar iska (ba tare da tururin ruwa ba).  Sauran iskar gas galibi ana kiran su iskar gas, daga cikinsu akwai iskar gas, musamman carbon dioxide, methane, nitrous oxide, da ozone. Bayan argon, wanda aka riga aka ambata, wasu gas masu daraja, neon, helium, krypton, da xenon suma suna nan. Iskar da aka tace ta hada da adadi mai yawa na sauran sinadarai . Abubuwa da yawa na asalin halitta na iya kasancewa a cikin gida da yanayi na canzawa kadan kamar aerosols a cikin samfurin iska wanda ba a tace ba, gami da kura na ma'adinai da abun da ke cikin halitta, pollen da spores, fesa ruwa, da tokar dutsen . Hakanan ana iya samun gurbatattun masana'antu daban -daban azaman gas ko aerosols, kamar chlorine (na asali ko a cikin mahadi), mahadan fluorine da kakkarfan tururi na mercury. Ana iya samun mahadan n sulfur kamar hydrogen sulfide da sulfur dioxide (SO 2 ) daga asalin halitta ko daga gurbataccen iska na masana'antu.

Matsakaicin matsakaicin nauyin busasshiyar iska, wanda za a iya amfani da shi don kididdige dimbin yawa ko don juyawa tsakanin gutsuttsuran kwayar cuta da dimbin yawa, kusan 28.946  ko 28.96  &nbsp;g/mun. Wannan yana raguwa lokacin da iskar ta yi dumi.

Matsakaicin yawan iskar gas ya ci gaba da kasancewa har zuwa kusan  . 

## Tsayuwa

Gaba ɗaya, matsin lamba da yawa  yana raguwa tare da tsayi a cikin yanayi. Koyaya, zazzabi yana da bayanin rikitarwa mai rikitarwa tare da tsayi, kuma yana iya kasancewa mai do rewa ko ma karuwa tare da tsayi a wasu yankuna (duba sashin zafin jiki, a kasa). Saboda ki rar gaba daya na bayanin zafin jiki/tsayi, ko kima, ya kasance mai dorewa kuma ana iya auna ta ta sautin balloon na kayan aiki, halayen zafin jiki yana ba da ma'auni mai amfani don rarrabe yadudduka yanayi. Ta wannan hanyar, ana iya raba yanayin duniya (wanda ake kira stratification) zuwa manyan yadudduka biyar: troposphere, stratosphere, mesosphere, thermosphere, da exosphere.  Tsawon layuka biyar sune kamar haka:

* Exosphere: 700 zuwa 10,000&nbsp;kilomita (440 zuwa 6,200 mil)
* Yanayin yanayi: 80 zuwa 700&nbsp;km (mil 50 zuwa 440) 
* Mesosphere: 50 zuwa 80&nbsp;km (31 zuwa 50 mil)
* Stratosphere: 12 zuwa 50&nbsp;km (kilomita 7 zuwa 31)
* Troposphere: 0 zuwa 12&nbsp;km (0 zuwa mil 7)

## Sararin Exosphere
 
Exosphere shine saman saman sararin samaniyar duniya (watau iyakar sararin samaniyar). Ya shimfida daga thermopause, a saman yanayin zafi a tsayin kusan 700&nbsp;km sama da matakin teku, zuwa kusan 10,000&nbsp;km (6,200&nbsp;mi; 33,000,000&nbsp;ft), inda ta shiga cikin iska mai haskakawa .

Wannan Layer galibi ya kunshi karancin karancin hydrogen, helium da wasu abubuwa masu nauyi da suka hada da nitrogen, oxygen da carbon dioxide kusa da exobase. Atoms da molecules sun yi nisa sosai ta yadda za su iya tafiya daruruwan kilomita ba tare da sun yi karo da juna ba. Don haka, exosphere ba ya yin kamar gas, kuma barbashi koyaushe yana tserewa zuwa sararin samaniya. Wadannan barbashi masu motsi suna bin hanyoyin ballistic kuma suna iya kaura zuwa ciki da waje daga magnetosphere ko iskar rana.

Sararin exosphere ne da nisan sama Duniya for meteorological mamaki ya zama zai yiwu. Koyaya, auroras na duniya - aurora borealis (fitilun arewa) da aurora australis (fitilun kudancin) - wani lokacin suna faruwa a cikin kananan exosphere, inda suke hadewa cikin yanayin zafi. Exosphere ya kunshi yawancin tauraron dan adam da ke kewaya Duniya.

## Sararin Thermospheres
 
The thermosphere shine na biyu mafi girma na sararin duniya. Ya zarce daga mesopause (wanda ke raba shi da mesosphere) a tsayin kusan  har zuwa thermopause a tsayin tsayin  . Tsayin thermopause ya bambanta da yawa saboda canje -canje a ayyukan hasken rana.  Saboda thermopause ya ta'allaka ne a ƙananan iyakar exosphere, ana kuma kiranta exobase . Sashin kasa na yanayin zafi, daga  sama da saman Duniya, ya kunshi ionosphere .

Yanabgi  na yanayin zafi a hankali yana karuwa da tsayi kuma yana iya hawa har zuwa , kodayake kwayoyin gas din sun yi nisa sosai don yawan zafin jiki a yanayin da aka saba ba shi da ma'ana sosai. Iskar ba ta da kima sosai ta yadda kwayoyin halittar mutum daya (na iskar oxygen, alal misali) ke tafiya matsakaicin  tsakanin cin karo da wasu kwayoyin.  Kodayake yanayin yanayin yana da yawan adadin kwayoyin halitta tare da babban kuzari, ba zai ji zafi ga dan adam a cikin Hulda kai tsaye ba, saboda yawansa ya yi kasa sosai don gudanar da babban adadin kuzari zuwa ko daga fata.

Wannan Layer gaba daya ba ta da gajimare kuma ba ta da tururin ruwa. Koyaya, abubuwan da ba na hydrometeorological kamar su aurora borealis da aurora australis ana ganin su a wasu lokuta a cikin yanayin zafi. Tashar sararin samaniya ta duniya tana kewaya wannan layin, tsakaniN. Shi wannan Layer inda yawancin tauraron dan adam da ke zagaya duniya suke.

## Mesosphere
 
Mesosphere shine na uku mafi girman yanayin sararin duniya, yana mamaye yankin sama da stratosphere kuma a kasa da yanayin zafi. Yana habaka daga madaidaiciyar madaidaiciya a tsayin kusan kilomita 50 (31mi; 160,000 ft) zuwa mesopause a kilomita 80-85 (50-54 mi) sama da matakin teku.

Yanayi na wuri yana raguwa tare da kara tsayi zuwa mesopause wanda ke nuna saman wannan tsakiyar sararin samaniyar. Shi ne wuri mafi sanyi a Duniya kuma yana da matsakaicin zafin jiki a kusa da -85 C (-120 digris F; 190 K).    .  

A kasa da madopause, iska tana da sanyi matuqa har ma da karancin tururin ruwa a wannan tsayin za a iya jujjuya shi zuwa gajimare mai kumburin polar-mesospheric noctilucent. Wadannan su ne mafi girman gizagizai a sararin samaniya kuma ana iya gani da idanu idan hasken rana ya haskaka su kusan awa daya ko biyu bayan faduwar rana ko makamancin haka kafin fitowar rana. Suna da saukin gani yayin da Rana tana kusa da digiri 4 zuwa 16 a kasa da sararin sama. Fuskokin da ke haifar da walkiya da aka sani da abubuwan da ke faruwa na dan lokaci (TLEs) suna faruwa a wasu lokutan a cikin mesosphere sama da tsawa. Hakanan mesosphere shine Layer inda yawancin meteors ke ko newa akan kofar yanayi. Ya yi yawa sama da Duniya don isa ga jirage masu amfani da jiragen sama da balloons, kuma ya yi kasa sosai don ba da damar sararin samaniya. Ana samun damar shiga mesosphere ne ta hanyar harba rokoki da jiragen sama masu amfani da roka.

## Sararin Stratosphere
 
Sararin Stratosphere shine na biyu mafi kaskancin na sararin duniya. Yana ta'allaka sama da troposphere kuma an rabu da shi da tropopause . Wannan Layer ya zarce daga saman troposphere a wajen  sama da saman Duniyar zuwa madaidaiciya a tsayin kusan kilomita  .

Matsalar yanayi a saman stratosphere shine kusan 1/1000 matsin lamba a matakin teku . Ya kunshi lemar sararin samaniya, wanda shine bangaren sararin duniya wanda ke dauke da iskar gas mai dan yawa. Stratosphere yana bayyana matakin da yanayin zafi ke karuwa tare da kara tsayi. Wannan hauhawar zafin jiki yana faruwa ne ta hanyar shan hasken ultraviolet radiation (UV) daga Rana ta hanyar lemar sararin samaniya, wanda ke takaita tashin hankali da cakudawa. Kodayake zazzabi na iya zama -76 dg F a tropopause, saman stratosphere yana da zafi sosai, kuma yana iya kasancewa kusa da 0&nbsp;° C. 

Bayanin zafin jiki na stratospheric yana haifar da tsayayyen tsarin yanayi, don haka stratosphere ba shi da habakar iska da ke samar da yanayi wanda ya zama ruwan dare a cikin troposphere. Sakamakon haka, stratosphere kusan ba ta da girgije da sauran nau'ikan yanayi. Duk da haka, ana iya ganin girgijen pola stratospheric ko nacreous a wani sashi na wannan Layer na yanayi inda iska ta fi sanyi. Stratosphere shine mafi girman matakin da jirgin sama mai amfani da jirgin sama zai iya isa.

## Saririn Troposphere
 
Sararin samaniya na Troposphere shine mafi kaskancin yanayin sararin duniya. Yana miƙawa daga farfajiyar Duniya zuwa matsakaicin tsayin kusan 12 km (7.5 mi; 39,000 ft), kodayake wannan tsayin ya bambanta daga kusan 9 km (5.6 mi; 30,000 ft) a ginshikan kasa zuwa 17 km (da 11 mi; 56,000 ft) a Equator,  tare da wasu bambancin saboda yanayi. Troposphere yana dauke a sama ta hanyar tropopause, iyaka wanda aka yiwa alama a yawancin wurare ta jujjuyawar zafin jiki (watau Layer na iska mai dumi sama da mai sanyi), a wasu kuma ta wani yanki wanda isothermal tare da tsayi.  

Kodayake bambance -bambancensu na faruwa, yawan zafin jiki yawanci yana raguwa tare da ƙara tsayi a cikin troposphere saboda mafi yawan abin da ake amfani da shi shine tabarbarewar makamashi daga farfajiya. Don haka, mafi kaskancin bangaren troposphere (watau Dandalin Duniya) yawanci shine mafi kyawun sashi na troposphere. Wannan yana habaka haduwa ta tsaye (saboda haka, asalin sunan sa a cikin kalmar Helenanci τρόπος, *tropos*, ma'ana "juyawa"). Troposphere ya kunshi kusan kashi 80% na yawan sararin duniya. Troposphere ya fi kowa karfi fiye da duk yadudduka na sararin samaniyar da ke ciki saboda babban nauyin yanayi yana zaune a saman troposphere kuma yana sa a matse shi sosai. Kashi hamsin cikin dari na jimlar iskar tana cikin kananan 5.6 km (3.5 mi; 18,000 ft) na sararin samaniyan troposphere.

Kusan duk tururin ruwa ko danshi ana samun sa a cikin sararin troposphere, don haka shine Layer inda yawancin yanayin duniya ke faruwa. Yana da asali duk nau'in nau'in halittar girgije mai alaka da yanayi wanda ke haifar da yaɗuwar iska mai karfi, kodayake tsayin girgije mai karfi na cumulonimbus na iya shiga cikin tarkon daga kasa kuma ya hau cikin kananan sashin stratosphere. Yawancin ayyukan zirga-zirgar jiragen sama na yau da kullun suna faruwa a cikin troposphere, kuma ita ce kawai madaidaicin da jirgin da ke tukawa zai iya isa.

## Wasu jerin sararin sama
A cikin manyan sassan biyar da ke sama, waɗanda galibi ana azancinsu da, ana iya rarrabe wasu sararin da yawa ta wasu kaddar:

* Shimfida na ozone yana kunshe a cikin stratosphere. A cikin wannan danyen iskar ozone kusan kashi 2 zuwa 8 a kowace miliyan, wanda ya fi na kasa sa kima amma har yanzu yana da kankanta idan aka kwatanta da manyan abubuwan da ke cikin sararin samaniya. Yafi kasancewa a cikin kananan bangaren stratosphere daga kusan , kodayake kauri ya bambanta da yanayi da yanayin kasa. Kusan kashi 90% na ozone a cikin sararin duniya yana cikin stratosphere.
* Yankin ionosphere yanki ne na sararin samaniya wanda ke haifar da ionized ta hanyar hasken rana. Yana da alhakin auroras . A lokacin awoyi na rana, yana mikawa daga  kuma ya haɗa da mesosphere, thermosphere, da sassan exosphere. Koyaya, ionization a cikin mesosphere galibi yana karewa cikin dare, don haka ana ganin auroras kawai a cikin yanayin zafi da kananan exosphere. Ionosphere shine ke haifar da gefen ciki na magnetosphere . Yana da mahimmanci a aikace saboda yana tasiri, alal misali, yaduwar rediyo a Duniya.
* An bayyana yanayin sararin samaniya da heterosphere ta ko iskar gas din ta hadu sosai. Hadin sararin samaniyar ya hada da troposphere, stratosphere, mesosphere, da mafi kaskancin na yanayin zafi, inda tsarin sunadarai na sararin samaniya bai dogara da nauyin kwayoyin cuta ba saboda gas din yana haduwa da tashin hankali.  Wannan Layer mai kama da juna ya kare a *turbopause da* aka samu kusan , ainihin sararin sararin samaniya kamar yadda FAI ta karɓa, wanda ya sanya shi kusan  sama da mesopause.

: A saman wannan tsayin hawan akwai heterosphere, wanda ya hada da exosphere da mafi yawan yanayin zafi. Anan, tsarin sunadarai ya bambanta da tsayi. Wannan saboda nisan da barbashi zai iya motsawa ba tare da yin karo da juna ba yana da girma idan aka kwatanta da girman motsi da ke haifar da haduwa. Wannan yana ba da damar iskar gas ta daidaita da nauyin kwayoyin, tare da masu nauyi, kamar oxygen da nitrogen, wadanda ke kusa da kasan heterosphere kawai. Babban bangaren heterosphere ya kunshi kusan gaba daya na hydrogen, mafi sauki. 

* Shimfidan  iyaka na duniya shine bangaren troposphere wanda shine mafi kusa da farfajiyar Duniya kuma abin ya shafe shi kai tsaye, galibi ta hanyar yaduwar tashin hankali . A cikin rana, galibin iyakokin duniya yana cakuda da kyau, yayin da da dare ya zama yana da daidaituwa tare da rauni ko gauraya. Zurfin faɗin iyakar duniya ya kai kusan  a sarari, kwanciyar hankali zuwa  ko sama da haka da rana a yankuna busasshe.

Matsakaicin zafin da ake samu a sararin samaniyar ƙasa shine   ko ,  gwargwadon abin tunani.   

## Abubuwan jiki

### Matsin da kauri
 
Abmatsakaicin yanayi matsa lamba a teku matakin ne a tsare ta International Standard yanayi kamar yadda . A wasu lokuta ana kiran wannan a matsayin naúrar ma'aunin yanayi (atm) . Jimlar yawan sararin samaniya shine 5.1480 × 10 18 kg (1.135 × 10 19 lb),  kusan 2.5% kasa da abin da za a iya samu daga matsakaicin matsin matakin teku da yankin Duniya na murabba'in 51007.2, wannan yanki yana kaura daga kasa mai tsaunuka na Duniya. Matsa lamba na yanayi shine jimlar nauyin iskar da ke sama da yanki a inda ake auna matsa lamba. Don haka matsin lamba ya bambanta da wuri da yanayi .

Idan duk daukakin sararin samaniya yana da daidaiton daidaituwa daidai da girman matakin teku (kusan 1.2&nbsp;kg da m 3 ) daga matakin teku zuwa sama, zai ƙare kwatsam a tsayin  . A zahiri yana raguwa sosai tare da tsayi, yana raguwa da rabi kowane  ko ta hanyar 1/ e kowane , matsakaicin girman sikelin sararin samaniya a ƙasa  . Koyaya, an daidaita yanayin yanayi daidai gwargwado tare da daidaitaccen lissafi don kowane Layer wanda ke ɗaukar gradients na zafin jiki, abun da ke cikin kwayoyin halitta, hasken rana da nauyi a cikin lissafi.

A taƙaice, ana rarraba yawan iskar Duniya kamar haka: 

* Kashi 50% yana ƙasa da  .
* 90% yana ƙasa da  .
* 99.99997% yana ƙasa da , layin Kármán . Ta babban taron ƙasa da ƙasa, wannan yana nuna farkon sararin samaniya inda ake ɗaukar matafiya 'yan sama jannati .

Idan aka kwatanta, taron Mt. Everest yana kan  ; Kamfanonin jiragen sama na kasuwanci yawanci suna yin balaguro tsakanin  inda siririn iska ke inganta tattalin arzikin mai; balloons yanayi sun kai  da sama; kuma jirgin X-15 mafi girma a shekarar 1963 ya kai  .

Ko sama da layin Kármán, manyan tasirin yanayi kamar auroras har yanzu suna faruwa. Meteors na fara haske a wannan yankin, kodayake manyan ba za su kone ba har sai sun zurfafa zurfafa. Daban -daban yadudduka na ionosphere na Duniya, masu mahimmanci ga yaduwar rediyon HF, sun fara kasa da 100&nbsp;km kuma ya zarce 500&nbsp;km da. By kwatanta, da International Space Station da kuma Space Jigila yawanci kewayewa a 350-400&nbsp;km, a cikin F-Layer na ionosphere inda suke haduwa da isasshen jan yanayi don bukatar sake juyawa kowane monthsan watanni, in ba haka ba, barna na orbital zai faru wanda zai haifar da komawa duniya. Dangane da aikin hasken rana, tauraron dan adam na iya fuskantar jan hankalin da ake gani a sama har zuwa 700-800&nbsp;km da.

##### Yanayin wuri
 

An tattauna rabuwar sararin samaniya zuwa yadudduka galibi ta hanyar magana da zafin jiki a sama. Zazzabi yana raguwa tare da tsayi daga matakin teku, amma bambancin wannan yanayin yana farawa sama da 11&nbsp;km, inda zafin jiki ke daidaitawa ta hanyar babban madaidaiciyar tazara ta sauran ragowar sararin samaniyar. A cikin stratosphere, farawa sama da kusan 20&nbsp;km, yanayin zafi ko sanyi yana karuwa da tsayi, saboda dumama a cikin sashin ozone wanda ya haifar da kama babban hasken ultraviolet daga Rana ta iskar oxygen da iskar gas a wannan yankin. Har ila yau, wani yanki na kara yawan zafin jiki tare da tsayi yana faruwa a cikin manyan madaukaki, a cikin yanayin da ake kira thermosphere sama da kilomita 90.

#### Gudun sauti
 
Saboda a cikin isasshen iskar gas na abun da ke ciki akai -akai saurin sauti ya dogara ne kawai akan zafin jiki kuma ba akan matsin gas ko yawa ba, saurin sauti a cikin yanayi tare da tsayi yana daukar yanayin yanayin yanayin rikitarwa mai rikitarwa (duba hoto zuwa dama), kuma baya nuna canje -canjen altitudinal a cikin yawa ko matsin lamba.

### Girma da yawa

 
Yawan iska a matakin teku yana kusan 1.2&nbsp;kg/m 3 (1.2&nbsp;g/L, 0.0012 g/cm 3 ). Ba a auna dimbin yawa kai tsaye amma akandididdige shi daga ma'aunin zafin jiki, matsin lamba da zafi ta amfani da kimar jihar don iska (nau'in dokar gas mai kyau ). Nauyin yanayi yana raguwa yayin da tsawo ke karuwa. Ana iya daidaita wannan bambancin ta amfani da dabarar barometric . Ana amfani da karin samfuran kira don hango lalacewar orbital na tauraron dan adam.

Matsakaicin yawan sararin samaniya shine kusan quadrillion 5 (5 ×   ) tan ko 1/1,200,000 yawan Duniya. Bisa ga Cibiyar Nazarin Kasa ta Amurka ta Amurka, "Jimlar ma'anar sararin samaniya shine 5.1480 ×  &nbsp;kg tare da kewayon shekara -shekara saboda tururin ruwa na 1.2 ko 1.5 ×  &nbsp;kg, dangane da ko ana amfani da matsin lamba ko bayanan tururin ruwa; dan karami fiye da kimantawar da ta gabata. An kiyasta yawan tururin ruwa kamar 1.27 ×  &nbsp;kg da yawan busasshen iska kamar 5.1352 ± 0.0003 ×  &nbsp;kg ku. "

## Kayayyakin gani
 
Solar radiation (ko hasken rana) ne da makamashi Duniya na'am daga Sun. Har ila yau, duniya tana sake fitar da radiation zuwa sararin samaniya, amma a cikin tsawon rakuman ruwa da ba za mu iya gani ba. Wani sashi na radiation mai shigowa da fitar da shi yana shakar ko nunawa ta yanayin. A watan Mayun 2017, an gano kyallen haske, wanda ake ganin yana walkiya daga tauraron dan adam mai tazarar mil mil daga nesa, an nuna haske daga kristal kankara a sararin samaniya.  

### Watsawa
 
Lokacin da haske ya ratsa sararin saman duniya, photons suna Hulda da ita ta hanyar *watsawa* . Idan hasken baya yin mu'amala da yanayin, ana kiransa *radiation kai tsaye* kuma shine abin da kuke gani idan za ku kalli Rana kai tsaye. *Hasken kai tsaye* haske ne wanda ya warwatse a sararin samaniya. Alal misali, a kan wani gizagizai rana a lokacin da ba za ka iya ganin your inuwa, babu wani kai tsaye radiation kai ku, shi ya duka aka wãtsa. A matsayin wani misali, saboda wani sabon abu da ake kira watsawa Rayleigh, guntun rakuman rakuman ruwa (Shudi) suna watsewa cikin sauki fiye da tsawon rakuman ruwa (ja). Wannan shine dalilin da yasa sararin sama yayi kama da shudi; kuna ganin hasken shudi mai warwatse. Wannan kuma shine dalilin da yasa faduwar rana take ja. Saboda Rana tana kusa da sararin sama, hasken Rana yana ratsa yanayi fiye da yadda aka saba don isa ga idon ku. Mafi yawa daga cikin shuɗin haske ya warwatse, ya bar jan haske a faɗuwar rana.

### Shanyewa

Kwayoyin halittu daban -daban suna shafan raƙuman radiyo daban -daban. Misali, O 2 da O 3 suna sha kusan duk rakuman ruwa fiye da nanometers 300. Ruwa (H 2 O) yana daukar rakuman ruwa masu yawa sama da 700&nbsp;nm. Lokacin da kwayar halitta ta sha foton, yana kara kuzari na kwayar. Wannan yana dumama yanayi, amma kuma yanayin yana sanyaya ta hanyar fitar da radiation, kamar yadda aka tattauna a kasa.

Hadadden iskar gas din da ake kira absorption spectra "windows" na karancin haske, yana ba da damar watsa wasu madaidaitan haske. Window na gani yana gudana daga kusan 300&nbsp;nm ( ultraviolet -C) zuwa cikin kewayon mutane na iya gani, bakan da ake iya gani (wanda ake kira haske), a kusan 400-700&nbsp;nm kuma yana ci gaba da infrared zuwa kusan 1100&nbsp;nm. Hakanan akwai tagogin infrared da rediyo waɗanda ke watsa wasu infrared da raƙuman rediyo a tsawon raƙuman ruwa. Misali, taga rediyon yana gudana daga kusan santimita daya zuwa rakuman ruwa kimanin mita goma sha daya.

### Yaduwa
 
*Fitarwa* ita ce kishiyar sha, shi ne lokacin da wani abu ya fitar da radiation. Abubuwa sukan yi ta fitar da adadi mai yawa da tsayin rakuman ruwa ta hanyar dogaro da karkatattun de kyallen " bakar fata ", saboda haka abubuwa masu zafi suna yawan fitar da karin radiation, tare da gajerun rakuman ruwa. Abubuwa masu sanyi suna fitar da karancin radiation, tare da tsawon rakuman ruwa. Misali, Rana kusan    , mafi girman haskenta yana kusa da 500&nbsp;nm, kuma ana iya gani ga idon dan adam. Duniya kusan , don haka haskensa ya kai kololuwa kusan 10,000&nbsp;nm, kuma yayi tsayi da yawa don ganin mutane.

Saboda yanayin zafi, yanayin yana fitar da hasken infrared. Misali, a cikin dare mai haske sararin samaniyar kasa yana hucewa da sauri fiye da daren girgije. Wannan saboda gajimare (H 2 O) suna da ƙarfi masu shayarwa da fitowar hasken infrared. Wannan kuma shine dalilin da yasa yake yin sanyi da daddare a wurare masu bisa.

Tasirin greenhouse effect yana da alaƙa kai tsaye da wannan shaye -shaye da tasirin iska. Wasu iskar gas a cikin yanayi suna sha da fitar da hasken infrared, amma basa Hulda da hasken rana a cikin bakan da ake gani. Misalan gama -gari na wadannan sune 

CO

 CO da H 2 O.

### Manuniya mai radadi i

Kididdigar iskar iska tana kusa, amma ya fi 1 girma. Bambance -bambancen da ke cikin tsari mai rikitarwa na iya haifar da lankwasa hasken haske a kan dogayen hanyoyin gani. Misali guda daya shine, a wasu yanayi, masu sa ido a cikin jiragen ruwa na iya ganin wasu jiragen ruwa kawai a sararin sama saboda haske yayi yawo a cikin alkibla daya kamar lankwasar saman Duniya.

Kididdigar iskar iska ta dogara da yanayin wuri na sanyi ko zafi.  yana haifar da tasirin juyawa lokacin da yawan zafin jiki ya yi yawa. Misalin irin wannan tasirin shine ƙaura .

## Da'irar Yaduwa
 

*Dairar yaduwar iska a sararin samaniya* shine babban motsi na iska ta hanyar troposphere, da hanyoyin (tare da kewayawar teku ) wanda ake rarraba zafi a kewayen Duniya. Babban tsarin sikelin sararin samaniya ya bambanta daga shekara zuwa shekara, amma ainihin tsarin yana da tsayayye saboda an ƙaddara shi ta hanyar jujjuyawar duniya da bambanci a cikin hasken rana tsakanin ma'aunin ma'aunai da sanduna.

## Juyin Halittar Yanayin Duniya
 

### Yanayin farko na sararin samaniya
Yanayin farko ya kunshi iskar gas a cikin nebula na rana, da farko hydrogen . Watakila akwai ruwa mai sauki kamar wadanda aka samu yanzu a cikin kungiyoyin gas ( Jupiter da Saturn ), musamman tururin ruwa, methane da ammoniya . 

### Sararin samaniya na biyu
Fitar iskar wutar volkeno, wanda ke cike da iskar gas da aka samar a lokacin matsanancin bama -bamai na duniya ta manyan taurari, ya samar da yanayi na gaba, wanda ya ƙunshi mafi yawa na nitrogen da carbon dioxide da iskar gas.  Wani babban sashi na iskar carbon dioxide ya narke cikin ruwa kuma yayi aiki tare da karafa kamar alli da magnesium yayin yanayin duwatsu masu kyalkyali don kirkirar carbonates wadanda aka ajiye azaman magudanar ruwa. An gano gurbatattun abubuwan da ke da alaƙa da ruwa tun daga farkon shekaru biliyan 3.8 da suka gabata. 

Kimanin shekaru biliyan 3.4 da suka wuce, sinadarin nitrogen ya zama babban sashi na kwanciyar hankali na . Dole ne a yi la’akari da tasirin rayuwa ba da daɗewa ba a cikin tarihin yanayi saboda alamun alamun farkon rayuwa sun bayyana tun shekaru biliyan 3.5 da suka gabata.  Yadda Duniya a wancan lokacin ta kasance da yanayin dumamar yanayi don isasshen ruwa mai ruwa da rayuwa, idan Rana ta farko ta fitar da ƙarancin hasken rana 30% fiye da na yau, abin wuyar warwarewa ne da aka sani da " suma matashin Sun ".

Duk da haka, ajiyayyen record na sararin sama yana nuna ɗimbin ɗimbin ɗimbin ɗimbin ɗimbin ɗimbin ɗimbin yawa yayin cikakken rikodin farkon zafin zafin duniya - in ban da wani lokaci mai sanyi na kimanin shekara biliyan 2.4 da suka gabata. A ƙarshen Archean Eon wani yanayi mai ɗauke da iskar oxygen ya fara haɓaka, da alama an samar da shi ta hanyar photosynthesizing cyanobacteria (duba Babban Taron Oxygenation ), waɗanda aka samo su a matsayin burbushin stromatolite daga shekaru biliyan 2.7 da suka gabata. Farkon isotopy na iskar carbon ( rabon isotope rabo ) yana ba da shawarar yanayi mai kama da na yanzu, da kuma cewa an kafa ƙa'idodin keɓaɓɓen tsarin carbon tun farkon shekaru biliyan 4 da suka gabata.

Tsoffin narkakken ruwa a Gabon da ke tsakanin kimanin shekaru biliyan 2.15 zuwa 2.08 da suka gabata suna ba da rikodin na  juyin halittar iskar Oxygen ta Duniya. Wataƙila waɗannan canje -canjen a cikin iskar oxygen ana iya motsa su ta balaguron isotope na Lomagundi. 

## Sararin sama  na uku

Sake saken tsara nahiyoyi ta plate tectonics yana tasiri juyin halittar yanayi na dogon lokaci ta hanyar canza carbon dioxide zuwa da daga manyan kantunan carbonate na nahiyar. Free oxygen bai wanzu a cikin sararin samaniya ba sai kusan shekaru biliyan 2.4 da suka gabata yayin Babban Taron Oxygenation kuma ana nuna kamanninsa ta ƙarshen ƙarfe da aka ɗaure .

Kafin wannan lokacin, duk wani iskar oxygen da photosynthesis ke samarwa ana cinye shi ta hanyar oxyidation na kayan da aka rage, musamman ƙarfe. Molecules na oxygen kyauta bai fara tarawa a cikin sararin samaniya ba har sai yawan samar da iskar oxygen ya fara wuce samuwar rage kayan da suka cire iskar oxygen. Wannan batu yana nuna juyawa daga yanayi mai ragewa zuwa yanayi mai konewa . O 2 ya nuna manyan bambance -bambancen har sai ya kai matsayi na sama da 15% a karshen Precambrian.  Lokaci mai zuwa daga shekaru miliyan 541 da suka gabata har zuwa yau shine Phanerozoic Eon, a farkon lokacinsa, Cambrian, isasshen iskar oxygen da ke buƙatar tsarin rayuwa na metazoan ya fara bayyana.

Adadin iskar oxygen a sararin samaniya ya canza a cikin shekaru miliyan 600 da suka gabata, ya kai kololuwar kusan kashi 30% kusan shekaru miliyan 280 da suka gabata, wanda ya fi na yau kashi 21%. Manyan matakai guda biyu suna sarrafa canje -canje a cikin yanayi: Shuke -shuke da ke amfani da iskar carbon dioxide daga sararin samaniya da sakin iskar oxygen, sannan tsire -tsire ta amfani da wasu iskar oxygen da daddare ta hanyar aikin photorespiration tare da sauran iskar oxygen da ake amfani da su don lalata abubuwan da ke kusa da su. Rushewar pyrite da dusar ƙanƙara ta fito da sulfur a cikin sararin samaniya, wanda ke shaye -shaye don haka yana rage adadin iskar oxygen a cikin sararin. Koyaya, fashewar dutsen yana kuma sakin carbon dioxide, wanda tsire -tsire na iya juyawa zuwa oxygen. Ba a san ainihin musabbabin bambancin adadin iskar oxygen a cikin sararin ba. Lokaci tare da iskar oxygen da yawa a cikin yanayin yana da alaka da saurin habak ya dabbobi. Yanayin yau yana dauke da iskar oxygen kashi 21%, wanda ya isa sosai ga wannan saurin ci gaban dabbobi. 

= Mene ne duwatsun da ke yawo a sararin samaniya? =
Asteroid: Ɗutse ne wanda bai da girma sosai da ke zagaye rana.

Comet: Shi ma dutse ne mara girma sosai kuma a wani lokaci yana aiki, kuma idan ya narke zai iya tafasa a rana ya zama ƙura da iska.

Meteoroid: Ɗan ƙaramin dutse ne daga comet ko kuma asteroid wanda ke zagaye rana.

Mateor: Hasken da ke fitowa idan Meteoroid ya shiga sararin samaniyar duniyar Earth kuma ya tafasa ya zama tauraro.

Meteorite: Wannan kuma dutse meteoroid ne da ya iya wucewa ya shiga sararin samaniyar duniyar Earth kuma ya sauka a kan ƙasar duniyar.

## Girma da adadi
A kullum, duniyar Earth na samun sama da tan 100 na ƙura da kuma ƙwayoyi na ƙasa. Kusan sau ɗaya a shekara, asteroid mai girman mota na faɗowa cikin sararin samaniya, wanda yake tahowa a matsayin dunƙulen wuta, sai ya ƙone kafin ya faɗo ƙasa. A duk shekara 2,000, ana samun meteoroid da ke da girman filin ƙwallo da ke faɗowa cikin duniyar Earth inda yake lalata wurin da ya faɗa. Haka kuma a miliyoyin shekaru, ana samun wani babban abu da ke faɗowa wanda ke barazana ga ci gaban duniya baki ɗaya.Duwatsun da ke sararin samaniya sun fi ƙanƙanta da kusan mita 25 kuma akasarinsu suna ƙonewa da zarar sun shiga duniyar Earth kuma ba su cika lalata wuri ba. Idan akwai dutsen meteoroid da ya fi girman mita 25 amma ƙasa da kilomita ɗaya, idan dutsen ya faɗo ƙasa, akwai yiwuwar zai iya lalata wurin. Idan aka kwatanta, asteroids da ke da yawa a duniyoyin Mars da Jupiter, kuma ba su da wata barazana ga duniyar Earth, kuma zai kai girman kilomita 940.

## Irin bala'in da ake fuskanta da ba a san zai faru ba
Akasarin meteorites da ake samo su a ƙasa ba su da nauyi. Sakamakon ƴan ƙanana ne ba su haddasa wata illa ga duniya. Meteorites mai nauyin 0.45kg wanda ke tafiya sama da gudun da ya kai 200mph zai iya fadowa kan rufin kwanon gida ya huda shi sa'annan ya fasa gilas ɗin mota. Alal misali, a lokacin da aka taɓa samun wani meteorite ya faɗo a Ontario da ke Canada a 2009 inda har ya fasa gilas ɗin mota. A wani lamarin kuma da ya faru, meteorites ɗin kuma ya taɓa faɗowa a bayan wata mota nau'in Chevy Malibu a Peekskill da ke New York sai dai babu wanda ya samu rauni sakamakon wannan lamarin. Wani meteorite ɗin kuma da ya sake faɗowa shi ne Tunguska meteorite wanda ya ɗara Chelyabinsk girma kuma ya fi ƙarfi da kusan kashi 10. Meteorite ya fashe a saman kogin Tunguska a ranar 30 ga watan Yunin 1908 inda ya bazar da kadada 500,000 na wani daji.

## Manazarta