ওজোন স্তর: সংশোধিত সংস্করণের মধ্যে পার্থক্য

উইকিপিডিয়া, মুক্ত বিশ্বকোষ থেকে
বিষয়বস্তু বিয়োগ হয়েছে বিষয়বস্তু যোগ হয়েছে
Mazhar Zarif (আলোচনা | অবদান)
সম্পাদনা সারাংশ নেই
Mazhar Zarif (আলোচনা | অবদান)
সম্পাদনা সারাংশ নেই
২৩ নং লাইন: ২৩ নং লাইন:


[[Image:Ozone solar UV absorb DNA action.jpg|thumb|300px|UV-B energy levels at several altitudes. Blue line shows DNA sensitivity. Red line shows surface energy level with 10% decrease in ozone]] [[Image:Ozone altitude UV graph.svg|thumb|280px|Levels of ozone at various altitudes and blocking of different bands of ultraviolet radiation. Essentially all UVC (100–280 nm) is blocked by dioxygen (from 100–200 nm) or else by ozone (200–280 nm) in the atmosphere. The shorter portion of the UV-C band and the more energetic UV above this band causes the formation of the ozone layer, when single oxygen atoms produced by UV [[photolysis]] of dioxygen (below 240 nm) react with more dioxygen. The ozone layer also blocks most, but not quite all, of the sunburn-producing UV-B (280–315 nm) band, which lies in the wavelengths longer than UV-C. The band of UV closest to visible light, UV-A (315–400 nm), is hardly affected by ozone, and most of it reaches the ground. UVA does not cause skin reddening, but there is evidence that it causes long-term skin damage.]]
[[Image:Ozone solar UV absorb DNA action.jpg|thumb|300px|UV-B energy levels at several altitudes. Blue line shows DNA sensitivity. Red line shows surface energy level with 10% decrease in ozone]] [[Image:Ozone altitude UV graph.svg|thumb|280px|Levels of ozone at various altitudes and blocking of different bands of ultraviolet radiation. Essentially all UVC (100–280 nm) is blocked by dioxygen (from 100–200 nm) or else by ozone (200–280 nm) in the atmosphere. The shorter portion of the UV-C band and the more energetic UV above this band causes the formation of the ozone layer, when single oxygen atoms produced by UV [[photolysis]] of dioxygen (below 240 nm) react with more dioxygen. The ozone layer also blocks most, but not quite all, of the sunburn-producing UV-B (280–315 nm) band, which lies in the wavelengths longer than UV-C. The band of UV closest to visible light, UV-A (315–400 nm), is hardly affected by ozone, and most of it reaches the ground. UVA does not cause skin reddening, but there is evidence that it causes long-term skin damage.]]

[[File:Ozone Hole.jpg|thumb|left|350px|ওজোন স্তরে সৃষ্ট ফুটো]]
[[File:Ozone over southern hemisphere Sep11 1957-2001.gif|thumb|left|350px|দক্ষিণ গোলার্ধের উপরকার ওজোন স্তর]]


[[বিষয়শ্রেণী:বায়ুমণ্ডল]]
[[বিষয়শ্রেণী:বায়ুমণ্ডল]]
[[বিষয়শ্রেণী:ভূগোল]]
{{Commons category|Ozone layer}}
{{Commons category|Ozone layer}}



০৭:৩৯, ২৩ সেপ্টেম্বর ২০১২ তারিখে সংশোধিত সংস্করণ

Brewer-Dobson circulation in the ozone layer.
Layers of Atmosphere - not to scale (NOAA)[১]

ওজোন স্তর হচ্ছে পৃথিবীর বায়ুমন্ডলের একটি স্তর যেখানে তুলনামূলকভাবে বেশি মাত্রায় ওজোন গ্যাস থাকে। এই স্তর থাকে প্রধানতঃ স্ট্র্যাটোস্ফিয়ারের নিচের অংশে, যা ভূপৃষ্ঠ থেকে কমবেশি ২০-৩০ কিমি উপরে অবস্থিত। এই স্তরের পুরুত্ব স্থানভেদে এবং মৌসুমভেদে কমবেশি হয়। [১]


তথ্যসূত্র

  1. "Science: Ozone Basics."। সংগ্রহের তারিখ ২০০৭-০১-২৯ 


আরো পড়ুন

  • Sei John H.; Pandis, Spyros N. (1998). Atmospheric Chemistry and Physics: From Air Pollution to Climate Change. John Wiley and Sons, Inc. ISBN 0-471-17816-0.


বহিঃসংযোগ


UV-B energy levels at several altitudes. Blue line shows DNA sensitivity. Red line shows surface energy level with 10% decrease in ozone
Levels of ozone at various altitudes and blocking of different bands of ultraviolet radiation. Essentially all UVC (100–280 nm) is blocked by dioxygen (from 100–200 nm) or else by ozone (200–280 nm) in the atmosphere. The shorter portion of the UV-C band and the more energetic UV above this band causes the formation of the ozone layer, when single oxygen atoms produced by UV photolysis of dioxygen (below 240 nm) react with more dioxygen. The ozone layer also blocks most, but not quite all, of the sunburn-producing UV-B (280–315 nm) band, which lies in the wavelengths longer than UV-C. The band of UV closest to visible light, UV-A (315–400 nm), is hardly affected by ozone, and most of it reaches the ground. UVA does not cause skin reddening, but there is evidence that it causes long-term skin damage.
ওজোন স্তরে সৃষ্ট ফুটো
দক্ষিণ গোলার্ধের উপরকার ওজোন স্তর