WASHINGTON (The Thursday Times) — NASA aur US National Oceanic and Atmospheric Administration (NOAA) ne report kiya hai ke is saal Antarctic ka ozone hole 48 saal ki nigrani mein saatwan sab se bara tha, lekin un ka kehna hai ke ozone layer behali ke raste par hai.
7 September se 13 October tak, jo ozone mein kami ke mausam ka urooj hota hai, hole ka ausat raqba taqreeban 2 crore 50 lakh square kilometre raha, jo Pakistan ke raqbe se taqreeban 28 guna hai. 18 September ko aik din mein is ka sab se bara raqba 2 crore 71 lakh square kilometre tak pahuncha. Ab tak dekha gaya sab se bara hole September 2000 mein saamne aaya tha.
Yeh bara zaroor tha, lekin sab se kharab saalon jitna gehra nahin tha. NOAA ke South Pole par lage balloon instruments ne 17 October ko 105 Dobson units ki sab se kam satah record ki, jo ozone naapne ka maiyari paimana hai, jab ke October 2006 mein record kam tareen satah 92 thi.
"Saalana ozone hole haal ke saalon mein mausam mein der se ban raha hai, jis se hamein pata chalta hai ke ozone layer theek ho rahi hai," NASA ki ozone tehqeeqi team ki taweel arse tak qiyadat karne wale senior scientist Paul Newman ne kaha. Unhon ne is saal ke hole ke bare hone ki wajah ghair mamooli taur par mazboot polar vortex ko qarar diya, jo hawaon ka woh halqa hai jo un sard halaat ko janam deta hai jin mein insan ke banaye hue chemicals se nikalne wali chlorine aur bromine ozone ko tabah karti hain.
Newman ne kaha ke agar yeh chemicals itne hi aam hote jitne 2000 mein apni intiha par thay, toh hole taqreeban 35 lakh square kilometre mazeed bara ho sakta tha.
Aik muahida jo kaam kar raha hai
Ozone layer zindagi ko suraj ki nuqsandeh shuaon se bachati hai. NASA aur NOAA ne 1987 ke Montreal Protocol ko is kamyabi ka sehra diya, jis ke teht mumalik ne ozone ko nuqsan pahunchane wale maadon ko badalne par ittefaq kiya tha. Antarctic ke stratosphere mein in chemicals se paida hone wali chlorine 1980 ki dehai ki satah ke muqable mein taqreeban aik tihai kam ho gayi hai, NOAA ke senior scientist Stephen Montzka ne kaha.
Yeh murakkabat kabhi refrigerators, air conditioners aur insulation mein bare pemane par istemal hote thay, aur kai dahaiyon tak baqi reh sakte hain. Scientists ka andaza hai ke surakh 2070 ki dahai tak bahal ho jayega.
