Yeni bir ara\u015ft\u0131rmaya g\u00f6re, \u00e7am a\u011fa\u00e7lar\u0131n\u0131n g\u00fc\u00e7l\u00fc kokusu ile iklim de\u011fi\u015fikli\u011fi aras\u0131nda sa\u011flam bir ili\u015fki var. Ara\u015ft\u0131rmac\u0131lar, \u00e7am ormanlar\u0131n\u0131n yukar\u0131s\u0131nda, adeta dumanla\u015fan koku buhar\u0131n\u0131n \u00f6nemli bir mekanizmay\u0131 \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131 fark ettiler. Bu par\u00e7ac\u0131klar, bulut \u015feklini alarak g\u00f6ky\u00fcz\u00fcnden yans\u0131yan g\u00fcne\u015f \u0131\u015f\u0131nlar\u0131n\u0131n so\u011fumas\u0131na yard\u0131mc\u0131 oluyor.<\/p>\n
Nature <\/em>dergisinde yay\u0131mlanan ara\u015ft\u0131rma, bug\u00fcne kadar ki bilgilerimizde eksik olan pek \u00e7ok aral\u0131\u011f\u0131 kapatacak gibi duruyor. Bu a\u00e7\u0131klardan en \u00f6nemlisi, atmosferik aerosollerin, s\u0131cakl\u0131k \u00fczerine etkisinin iklim de\u011fi\u015fikli\u011fiyle ili\u015fkisinin nas\u0131l oldu\u011fuydu.<\/p>\n Bulut \u015feklini alan par\u00e7ac\u0131klar g\u00fcne\u015f \u0131\u015f\u0131\u011f\u0131n\u0131 engelleyerek adeta yans\u0131yan \u0131\u015f\u0131nlar gibi g\u00f6ky\u00fcz\u00fcne geri yollayabiliyor. Bu \u015fekil alma, volkanik aktivite gibi do\u011fal yollarla olabildi\u011fi gibi; ta\u015fk\u00f6m\u00fcr\u00fc ve ya\u011f yak\u0131m\u0131 sonucu olarak, yani insan eliyle de olu\u015fturulabiliyor.<\/p>\n Aerosol kaynaklar\u0131n\u0131n az fakat epey \u00f6nemli bir k\u0131sm\u0131 olan ho\u015f kokulu \u00e7am a\u011fac\u0131 buharlar\u0131, Kuzey Amerika, Kuzey Avrupa ve Rusya\u2019daki ya\u011fmur ormanlar\u0131nda bulundu. Bu aerosoller biliminsanlar\u0131n\u0131n daha \u00f6nce belirleyebildi\u011fi say\u0131dan \u015fa\u015f\u0131rt\u0131c\u0131 derecede farkl\u0131 form i\u00e7eriyordu. \u015eu anda art\u0131k ara\u015ft\u0131rmac\u0131lar, so\u011futucu par\u00e7ac\u0131klar aras\u0131ndan hangi zengin kokunun yans\u0131t\u0131c\u0131 etki yapt\u0131\u011f\u0131n\u0131 belirleyen kimyasal gizemi \u00e7\u00f6zd\u00fcklerinden eminler.<\/p>\n Biliminsanlar\u0131, organik materyalin gaz haline gelmesiyle olu\u015fan \u00e7am kokusunun, havan\u0131n oksijeniyle etkile\u015fime girip, ormanlar\u0131n \u00fcst k\u0131s\u0131mlar\u0131nda aerosol formlar\u0131na d\u00f6n\u00fc\u015ft\u00fc\u011f\u00fcn\u00fc uzun zamand\u0131r biliyorlard\u0131. \u015eimdi ise s\u00fcre\u00e7te \u201ckay\u0131p ba\u011flant\u0131\u201d terimini uygun g\u00f6rd\u00fckleri ba\u015fka bir ad\u0131m oldu\u011funu buldular. Buna g\u00f6re, \u00e7ok d\u00fc\u015f\u00fck u\u00e7uculuk g\u00f6steren organik buharlar, herhangi bir y\u00fczey \u00fczerinde geri d\u00f6n\u00fc\u015fs\u00fcz yo\u011funla\u015fma yaratabiliyor.<\/p>\n Washington \u00dcniversitesi\u2019nde ara\u015ft\u0131rmay\u0131 y\u00fcr\u00fcten Dr. Joel Thornton\u2019a g\u00f6re bu buharla\u015fma dokusu daha \u00f6nce bilinenden \u00e7ok farkl\u0131. Bu seviyedeki de\u011fi\u015fiklik, en k\u00fc\u00e7\u00fck par\u00e7ac\u0131klar\u0131n bile yap\u0131\u015farak boyutlar\u0131n\u0131 artt\u0131rd\u0131\u011f\u0131 ve b\u00fcy\u00fcyerek aerosollere d\u00f6n\u00fc\u015ft\u00fc\u011f\u00fcn\u00fc g\u00f6steriyor. Ara\u015ft\u0131rmac\u0131lara g\u00f6re bu \u201cyol\u201dun net bir \u015fekilde a\u00e7\u0131kl\u0131\u011fa kavu\u015fmas\u0131, aerosole d\u00f6nen orman kokular\u0131n\u0131n y\u00fckselen s\u0131cakl\u0131\u011f\u0131 nas\u0131l s\u0131n\u0131rlad\u0131\u011f\u0131n\u0131 do\u011fru anlamam\u0131za yard\u0131mc\u0131 olacakt\u0131r. Elbette bu bilgi iklim de\u011fi\u015fikli\u011fi konusunda ormanlar\u0131n rol\u00fcyle ilgili can al\u0131c\u0131 bir \u00f6nem ta\u015f\u0131yor.<\/p>\n \u00c7am ormanlar\u0131n\u0131n bitki \u00f6rt\u00fcs\u00fcnden yay\u0131lan koku ve buhar, t\u00fcm orman\u0131 kaplayan ve yukar\u0131 do\u011fru ilerleyen aerosollerin a\u015fa\u011f\u0131 yukar\u0131 yar\u0131s\u0131n\u0131 olu\u015fturuyor. Bu durumda ara\u015ft\u0131rmac\u0131lar koku ve buhar\u0131n nas\u0131l par\u00e7ac\u0131kla\u015ft\u0131\u011f\u0131n\u0131 a\u00e7\u0131klad\u0131klar\u0131na g\u00f6re, aerosolle\u015fmenin \u00fczerindeki soru i\u015faretlerinin yar\u0131s\u0131 da kalkm\u0131\u015f oluyor. Uzmanlara g\u00f6re bu mekanizma, s\u0131cakl\u0131k art\u0131\u015f\u0131n\u0131n azalmas\u0131nda \u00f6nemli bir rol oynayacak ve etkisi gelecekte daha da g\u00fc\u00e7lenecek. S\u0131cakl\u0131\u011f\u0131 artm\u0131\u015f d\u00fcnyada CO2<\/sub>\u2019nin y\u00fckselmesiyle fotosentez h\u0131zlanacak, bu da bitki \u00f6rt\u00fcs\u00fcn\u00fcn kontrols\u00fcz b\u00fcy\u00fcmesine ve daha fazla buharla\u015fmaya sebep olacak. Bu durum daha fazla zerrecik yaratacak ve bunlar\u0131n birle\u015fmesiyle olu\u015fan \u201cso\u011futucu etki\u201d bir \u201cindirim etkisi\u201dne d\u00f6necek.<\/p>\n Ara\u015ft\u0131rmac\u0131lar \u00f6rneklemelerini ve ara\u015ft\u0131rmalar\u0131n\u0131 Finlandiya Ormanlar\u0131 ve Almanya\u2019daki Julich Ara\u015ft\u0131rma Merkezi\u2019nde yapt\u0131lar. Daha \u00f6nce ara\u015ft\u0131rmac\u0131lar\u0131n, \u00e7ok d\u00fc\u015f\u00fck d\u00fczeydeki buharla\u015fma materyalini meydana \u00e7\u0131karacak ekipmanlar\u0131 yoktu. Metal deney t\u00fcp\u00fcne koyduklar\u0131 materyal, t\u00fcp\u00fcn duvarlar\u0131yla temas etti\u011finde kayboluyordu. Duvarlar\u0131 m\u00fcmk\u00fcn oldu\u011funca azalt\u0131lm\u0131\u015f, y\u00fcksek hava ak\u0131ml\u0131, k\u0131sa menfezli yeni ekipmanla adeta atmosferden direkt elde edilen \u00f6rne\u011fe benzer materyaller elde edilebildi.<\/p>\n Ara\u015ft\u0131rmac\u0131lar bu \u201cher derde deva\u201d g\u00f6r\u00fcnen a\u00e7\u0131klamalar\u0131n ve ara\u015ft\u0131rmalar\u0131n a\u015f\u0131r\u0131 \u0131s\u0131nma veya susuzluk tehdidiyle ilerlemeyece\u011finden endi\u015feliler. Ancak ara\u015ft\u0131rmay\u0131 yapan ekip bu etkinin epeyce bir s\u00fcre belirgin olarak s\u00fcrece\u011finde hemfikir.<\/p>\n","protected":false},"excerpt":{"rendered":" Yeni bir ara\u015ft\u0131rmaya g\u00f6re, \u00e7am a\u011fa\u00e7lar\u0131n\u0131n g\u00fc\u00e7l\u00fc kokusu ile iklim de\u011fi\u015fikli\u011fi aras\u0131nda sa\u011flam bir ili\u015fki var. Ara\u015ft\u0131rmac\u0131lar, \u00e7am ormanlar\u0131n\u0131n yukar\u0131s\u0131nda, adeta dumanla\u015fan koku buhar\u0131n\u0131n \u00f6nemli bir mekanizmay\u0131 \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131 fark ettiler. Bu par\u00e7ac\u0131klar, bulut \u015feklini alarak g\u00f6ky\u00fcz\u00fcnden yans\u0131yan g\u00fcne\u015f \u0131\u015f\u0131nlar\u0131n\u0131n so\u011fumas\u0131na yard\u0131mc\u0131 oluyor. Nature dergisinde yay\u0131mlanan ara\u015ft\u0131rma, bug\u00fcne kadar ki bilgilerimizde eksik olan pek \u00e7ok aral\u0131\u011f\u0131 […]<\/p>\n","protected":false},"author":42,"featured_media":26376,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[159,19,217],"tags":[1983,3402,198,308],"class_list":["post-26375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-122-sayi","category-bilim-gundemi","category-cevre-bilimleri","tag-bitki-ortusu","tag-cam-agaclari","tag-cevre","tag-iklim"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t