Global isish kuchi

right|thumb| Atmosferadagi uzoq muddatli issiqxona gazlarining tarqaluvchi ta'siri (issiqlik ta'siri) tezlashdi va 40 yil ichida deyarli ikki baravar ko'paydi.
Global isish kuchi ( GIK ) bu issiqxona gazlari tomonidan atmosferaga qo'shilgan infraqizil termal nurlanishni ma'lum vaqt oralig'ida qancha qismi o'zlashtirishining o'lchov birligidir, bu birlik biror bir gazni bir xil og'irlikdagi karbonat angidrid tomonidan so'rilgan issiqlikka nisbatan xisoblab topiladi. GIK karbonat angidrid uchun 1 ga teng. Boshqa gazlar uchun bu birlik, ma'lum bir gaz infraqizil termal nurlanishni qanchalik kuchli yutishiga, gazning atmosferani qanchalik tez tark etishiga va hisobga olinadigan vaqtga bog'liq bo'ladi. Karbonat angidrid ekvivalenti ( CO e yoki CO ekvivalenti yoki CO -e) GIK dan hisob topiladi. Shunday qilib, u turli gazlarning iqlim ta'sirini o'lchash uchun umumiy shkala bo'lib hizmat qiladi.

Metanning GIK (20+ yil vaqt uchun hisoblangan) 81,2 ni tashkil qiladi, ya'ni, masalan, bir tonna metan sizib chiqishi 81,2 tonna karbonat angidridni chiqarishga teng. Xuddi shunday bir tonna azot oksidi, masalan,odatda go'ng yoki sholi dalalaridadan ajralib chiqadi, 273 tonna karbonat angidridga teng. Shuning uchun metan atmosferamizni karbinat angidriddan ko'ra 81.2 marta ko'proq isitadi, azot oksidi esa 273 marta ko'roq iqlim o'zgarishlariga sabab bo'ladi.

Issiqxona gaziKimyoviy formulasi100-yillik Global isish kuchi (2007 estimates, for 2013–2020 comparisons)Carbon dioxideCO21MethaneCH425Nitrous oxideN2O298Hydrofluorocarbons (HFCs)HFC-23CHF314,800Difluoromethane (HFC-32)CH2F2675Fluoromethane (HFC-41)CH3F92HFC-43-10meeCF3CHFCHFCF2CF31,640Pentafluoroethane (HFC-125)C2HF53,500HFC-134C2H2F4 (CHF2CHF2)1,1001,1,1,2-Tetrafluoroethane (HFC-134a)C2H2F4 (CH2FCF3)1,430HFC-143C2H3F3 (CHF2CH2F)3531,1,1-Trifluoroethane (HFC-143a)C2H3F3 (CF3CH3)4,470HFC-152CH2FCH2F53HFC-152aC2H4F2 (CH3CHF2)124HFC-161CH3CH2F121,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea)C3HF73,220HFC-236cbCH2FCF2CF31,340HFC-236eaCHF2CHFCF31,370HFC-236faC3H2F69,810HFC-245caC3H3F5693HFC-245faCHF2CH2CF31,030HFC-365mfcCH3CF2CH2CF3794PerfluorocarbonsCarbon tetrafluoride – PFC-14CF47,390Hexafluoroethane – PFC-116C2F612,200Octafluoropropane – PFC-218C3F88,830Perfluorobutane – PFC-3-1-10C4F108,860Octafluorocyclobutane – PFC-318c-C4F810,300Perfluouropentane – PFC-4-1-12C5F129,160Perfluorohexane – PFC-5-1-14C6F149,300Perfluorodecalin – PFC-9-1-18bC10F187,500Perfluorocyclopropanec-C3F617,340Sulfur hexafluoride (SF6)Sulfur hexafluorideSF622,800Nitrogen trifluoride (NF3)Nitrogen trifluorideNF317,200Fluorinated ethersHFE-125CHF2OCF314,900Bis(difluoromethyl) ether (HFE-134)CHF2OCHF26,320HFE-143aCH3OCF3756HCFE-235da2CHF2OCHClCF3350HFE-245cb2CH3OCF2CF3708HFE-245fa2CHF2OCH2CF3659HFE-254cb2CH3OCF2CHF2359HFE-347mcc3CH3OCF2CF2CF3575HFE-347pcf2CHF2CF2OCH2CF3580HFE-356pcc3CH3OCF2CF2CHF2110HFE-449sl (HFE-7100)C4F9OCH3297HFE-569sf2 (HFE-7200)C4F9OC2H559HFE-43-10pccc124 (H-Galden 1040x)CHF2OCF2OC2F4OCHF21,870HFE-236ca12 (HG-10)CHF2OCF2OCHF22,800HFE-338pcc13 (HG-01)CHF2OCF2CF2OCHF21,500(CF3)2CFOCH3343CF3CF2CH2OH42(CF3)2CHOH195HFE-227eaCF3CHFOCF31,540HFE-236ea2CHF2OCHFCF3989HFE-236faCF3CH2OCF3487HFE-245fa1CHF2CH2OCF3286HFE-263fb2CF3CH2OCH311HFE-329mcc2CHF2CF2OCF2CF3919HFE-338mcf2CF3CH2OCF2CF3552HFE-347mcf2CHF2CH2OCF2CF3374HFE-356mec3CH3OCF2CHFCF3101HFE-356pcf2CHF2CH2OCF2CHF2265HFE-356pcf3CHF2OCH2CF2CHF2502HFE-365mcfI’ll t3CF3CF2CH2OCH311HFE-374pc2CHF2CF2OCH2CH3557– (CF2)4CH (OH) –73(CF3)2CHOCHF2380(CF3)2CHOCH327PerfluoropolyethersPFPMIECF3OCF(CF3)CF2OCF2OCF310,300Trifluoromethyl sulfur pentafluorideSF5CF317,400

 Global isish kuchini hisoblash 
GIK quyidagi omillarga bog'liq:

 ma'lum bir gaz tomonidan infraqizil nurlanishning yutilishi
 ma'lum bir belgilangan vaqt (integratsiya davri)
 gazning atmosferada qolish vaqti

Yuqori GIK katta infraqizil yutilish va uzoq atmosferada qolish vaqti bilan bog'liq. GWP ning yutilish to'lqin uzunligiga bog'liqligi ancha murakkab. Agar gaz ma'lum bir to'lqin uzunligida radiatsiyani samarali o'zlashtirsa ham, atmosfera shu to'lqin uzunligida eng ko'p nurlanishni usiz ham o'zlashtirsa, bu GIKga unchalik ham ta'sir qilmasligi mumkin. Agar gaz atmosfera yutmaydigan to'lqin uzunliklaridagi nurni yutsa, eng katta ta'sirga ega bo'ladi. GIK ning to'lqin uzunligiga bog'liqligi empirik tarzda topilgan va grafik sifatida nashr etilgan.