aarkatik

Arctic (orthographic projection).svg
krutrim roop se ranga hua aarkatik ka sthalaakrutik maanachitr

aarkatik, pruthvi ke uttari dhruv ke aaspaas ke kshetr ko theek usi prakaar kehte hai, jis tarah dakshini dhruv ke aaspaas ka kshetr antaarkatik kahalaata hai. aarkatik kshetr mein aarkatik mahaasaagar (jo uttari dhruv par faila hai), Canada ke kuchh bhaag, greenalaind (Denmark ka ek kshetr), roos ka kuchh hissa, sanyukt raajya America (alaaska), aaisalaind, naarve, sveedan aur Finland shaamil hain. aarkatik shabd yoonaani shabd αaaρaaκaaτaaιaaκaaόaaς (aartikos) se aata hai jo ya to nakshatr-mandl saptarishi ya fir dhruv taare ko ingit karta hai.

aarkatik kshetr ko aarkatik vrut (66°a33'N) ke uttari kshetr ke roop mein paribhaashit kiya ja sakta hai, jo ardharaatri soorya aur dhruveeya raat ki anumaanit seema hai. isko ek doosari tarah se paribhaashit karne ke liye kaha ja sakta hai ki, yeh vah kshetr hai jahaan sabse garm maah (July) ka ausat taapamaan 10 degree celcius (50 °aF) se kam hota hai aur sabse uttari vruksh rekha is kshetr ki seema ki samataap rekha se lagbhag milti hai.[1][2] saamaajik aur raajaneetik roop se aarkatik kshetr mein aath aarkatik deshon ke uttari kshetr shaamil hai, haalaanki praakrutik vigyaan ki paribhaashaaon ke anusaar in deshon ke in uttari kshetron ko up-aarkatik kshetr maana jaata hai.

aarkatik kshetr mein ek vishaal barf se dhaka mahaasaagar hai (jise kabhi kabhi atalaantik mahaasaagar ka uttari bhaag bhi maana jaata hai) jiske chaaron or vanaspativiheen parmaafrost (sthaayeetushaar) upasthit hai. haal ke varshon mein samudra mein barf ki maatra mein kami I hai. aarkatik ke jeevanachakr mein barf mein rahane vaale jeev,[3] praaneeplavak, paadapaplavak, machhaliyaan, samudri stanapaayi, pakshi, sthalachar jeev, paadap aur maanav shaamil hain. aarkatik kshetr pruthvi ki paaristhitiki pranaaliyon ke beech ek adviteeya kshetr hai. aarkatik ke mool nivaasi aur unki sanskruti is kshetr ki visham sheet aur charam paristhitiyon ke liye abhyast ho gaye hai.

bhoomandaleeya ooshmeekaran ke parinaamasvaroop dhruvon ki or khiskati samataap rekhaaon (pichhle 30 varshon ke dauraan lagbhag 35 meal prati dashak) ke kaaran aarkatik kshetr jise vruksh rekha aur taapamaan ke dvaara paribhaashit kiya jaata hai, vartamaan mein sikud raha hai,[4] jiska shaayad sabse bada parinaam samudri barf ki maatra mein I kami hai. bhinn bhinn pareekshan anumaanon ke anusaar aarkatik saagar ki jyaadaatar barf ya to poori tarah se ya fir iski jyaadaatar September 2040 se lekar san 2100 ke baad ke kuchh samay tak, nasht ho jaayegi.[5]


sandarbh

  1. "arctic." Dictionary.com Unabridged (v 1.1). Random House, Inc. Retrieved on May 2, 2009.
  2. Addison, Kenneth (2002). Fundamentals of the physical environment. Routledge. pa॰ 482.
  3. Christopher Krembs and Jody Deming. "Organisms that thrive in Arctic sea ice." National Oceanic and Atmospheric Administration. November 18, 2006.
  4. Hansen, Jim (October 19, 2006). "The Planet in Peril – Part I". Yale Center for the Study of Globalization. http://yaleglobal.yale.edu/content/planet-peril-%E2%80%93-part-i.
  5. Serreze, Mc; Holland, Mm; Stroeve, J (Mar 2007). "Perspectives on the Arctic's shrinking sea-ice cover". Science (New York, N.Y.) 315 (5818): 1533–6. doi:10.1126/science.1139426. PMID 17363664.

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