Tsarin Keeling

Keeling Curve hoto ne na bambancin shekara-shekara da tarin carbon dioxide a cikin yanayin duniya bisa ga ci gaba da ma'auni da aka dauka a Mauna Loa Observatory a tsibirin Hawaii daga 1958 zuwa yau. An sanya sunan layin ne ga masanin kimiyya Charles David Keeling, wanda ya fara shirin saka idanu kuma ya kula da shi har zuwa mutuwarsa a shekara ta 2005.

## Tarihi
Kafin shekarun 1950, an dauki ma'auni na ma'auninCO na yanayi a wurare daban-daban. A cikin 1938, injiniya kuma masanin yanayin yanayi Guy Stewart Callendar ya kwatanta bayanan CO2 na yanayi daga Kew a cikin 1898-1901, wanda ya kai matsakaicin kashi 274 a kowace miliyan ta hanyar girma (ppm),  kuma daga gabashin Amurka a cikin 1936-1938, wanda ya kai kimanin 310 ppm, kuma ya kammala cewa yawan CO2 yana ƙaruwa saboda fitar da hayaki.  Koyaya, binciken Callendar ba a yarda da shi ba ta hanyar masana kimiyya saboda yanayin ma'aunin.

Charles David Keeling, na Scripps Institution of Oceanography a UC San Diego, shi ne mutum na farko da ya fara yin ma'auni akai-akai na yanayi CO 2 a Antarctica, da kuma Mauna Loa, Hawaii daga Maris 1958 zuwa gaba.  Keeling ya gwada a baya kuma ya yi amfani da dabarun aunawa a wurare da suka hada da Big Sur kusa da Monterey, dazuzzukan ruwan sama na tsibirin Olympics a jihar Washington, da dazuzzukan tsaunuka masu tsayi a Arizona .  Ya lura da halayen CO 2 mai ƙarfi na diurnal, tare da wuce haddi na CO 2 da dare saboda shakar da tsire-tsire da ƙasa, da ƙimar rana mai wakiltar "yanayin 'yanci" a kan Arewacin Arewa . 

## Mauna Loa ma'auni

A cikin shekara ta 1957-1958, Shekarar Geophysical ta Duniya, Keeling ta sami kudade daga Ofishin Yanayi don shigar da Masu nazarin iskar infrared a wurare masu nisa, gami da Kudancin Kudancin da kuma dutsen Mauna Loa a tsibirin Hawaii. An zaɓi Mauna Loa a matsayin wurin sa ido na dogon lokaci saboda wurin da yake da nisa daga nahiyoyi da rashin ciyayi. Keeling da abokan aikinsa sun auna iska mai shigowa a saman layin juyawa na zafi don rage gurɓataccen gida daga hanyoyin dutsen wuta. An daidaita bayanan don cire duk wani tasiri daga gurɓataccen gida. Saboda raguwar kudade a tsakiyar shekarun 1960, an tilasta wa Keeling ya bar ci gaba da sa ido a Kudancin Pole, amma ya tara isasshen kuɗi don kula da ayyukan a Mauna Loa Observatory, wanda ya ci gaba har zuwa yau.

Keeling's  labarin na 1960 ya gabatar da rikodin  na farko na kowane wata daga Mauna Loa da Antarctica (1957 zuwa 1960), gano "babban sake zagayowar yanayi... kuma mai yiwuwa, hauhawar duniya a cikin CO2 daga shekara zuwa shekara. " : 41-42 A cikin shekarun 1970s, an tabbatar da cewa karuwar carbon dioxide na yanayi yana ci gaba kuma saboda fitar da mutane. 

Ana yin ma'aunin carbon dioxide a Mauna Loa Observatory a Hawaii tare da nau'in infrared spectrophotometer, wanda a yanzu aka sani da firikwensin infrared mara lahani, wanda aka daidaita ta amfani da ka'idodin Hukumar Kula da Yanayi ta Duniya .  Wannan nau'in kayan aiki, wanda asalin ake kira capnograph, John Tyndall ne ya fara ƙirƙira shi a cikin 1864, kuma an rubuta shi ta hanyar alamar alƙalami akan na'urar rakodin zane.  A halin yanzu, ana ƙara na'urori masu amfani da Laser da yawa don yin aiki tare tare da infrared spectrophotometer a Cibiyar Scripps na Oceanography, yayin da ma'aunin NOAA a Mauna Loa har yanzu yana amfani da firikwensin infrared mara kyau .

## Sakamakon da fassarar
Ma'aunin da aka tattara a Mauna Loa Observatory yana nuna ci gaba mai girma a cikin ma'anar yanayi CO 2 maida hankali daga 313 sassa da miliyan ta girma ( ppm ) a cikin Maris 1958 zuwa 406 ppm a watan Nuwamba 2018,  tare da karuwa na yanzu na 2.48 ± 0.26 (ma'anar ± 2 std CO a kowace shekara ) .  Wannan karuwa a cikin yanayi CO 2 ya faru ne saboda konewar man fetur, kuma yana karuwa a cikin 'yan shekarun nan. Tunda CO 2 iskar gas ce, wannan yana da matukar tasiri ga dumamar yanayi . Ma'auni na CO 2 a cikin kumfa na daɗaɗɗen iska da aka makale a cikin nau'ikan kankara na polar sun nuna cewa ma'anar yanayi CO 2 maida hankali ne tsakanin 275 da 285 ppm a lokacin Holocene zamanin (9,000 KZ a gaba), amma ya fara tashi sosai a farkon karni na sha tara. 

Har ila yau, Keeling Curve yana nuna bambancin cyclic na kimanin 6  a kowace shekara wanda ya dace da canjin yanayi a cikin ɗaukar CO ta hanyar ciyayi na duniya. Yawancin wannan ciyayi shuka cikin Arewacin Hemisphere inda yawancin ƙasar ke. Daga matsakaicin watan Mayu, matakin yana raguwa a lokacin bazara da rani yayin da sabon tsire-tsire ke ɗaukar CO2 daga yanayi ta hanyar photosynthesis. Bayan ya kai mafi ƙaranci a watan Satumba, matakin ya sake tashi a arewacin kaka da hunturu yayin da tsire-tsire da ganye suka mutu kuma suka lalace, suna saki CO2 a cikin yanayi.

## Manazarta