http___m.metro-portal.hr_tags_view_ozonska-rupa_1.xml
1.1 1.2 2.1 3.1 3.2 3.3 3.4 4.1 4.2 5.1 5.2 6.1 6.2 7.1 7.2 8.1 9.1 9.2 9.3
The hole in the ozone layer over Antarctica is nearing record-breaking size again, scientists say. In fact, new observations show that the infamous "ozone hole" is currently larger than the entire continent of North America. Researchers at the German Aerospace Center are using Earth-observing satellites to monitor the protective ozone layer and recently reported that a large, nearly circular hole over Antarctica extends over an area measuring 26 million square km (10 million square miles). Losing part of the ozone layer over Antarctica is an annual phenomenon, but for the past nine years, the ozone hole has been consistently smaller than the record-breaking 27 -million-square-km (10.4 million square miles) ozone hole measured in 2006, according to annual records from NASA's Goddard Space Flight Center. Scientists thought the apparent stabilization indicated that the ozone layer was recovering very gradually. But this year's ozone hole surprised them because it formed a whole month later in the year than the ozone hole typically forms, and its size is almost record-breaking. [Top 10 Ways to Destroy Earth ] "In August 2015, we observed an unusually strong southern flow, which directs warm and ozone-rich air masses from lower latitudes over Antarctica," Michael Bittner, one of the researchers responsible for the World Data Center for Remote Sensing of the Atmosphere at the German Aerospace Center, said in a statement. "The typical polar vortex, which provides isolation for Antarctica, could not develop well under these conditions." The ozone layer occurs at an altitude between 10 and 50 km (6 and 31 miles) above the Earth's surface, in the stratosphere, according to researchers at the German Aerospace Center. During the Southern Hemisphere's winter, the concentration of chlorofluorocarbons — nontoxic, nonflammable chemicals containing carbon, chlorine and fluorine that used to be used in products such as hair spray and refrigerators — increases due to lower temperatures, according to the U.S. Environmental Protection Agency (EPA). When spring comes to the Southern Hemisphere, the additional sunlight causes chlorofluorocarbons to create an ozone-depleting effect, the EPA website explained. The ozone hole reaches its annual maximum expansion during the spring months in the Southern Hemisphere and then reduces in size again during the local late spring. The ozone layer protects life on Earth from the sun's harmful ultraviolet rays, according to NASA's Earth Observatory. Overexposure to ultraviolet rays increases the risk of skin cancer and cataracts in humans, and this type of radiation has also been known to cause blindness in animals, according to the Climate Science Coalition. NASA recently announced that the ozone hole would heal itself and be half-closed by 2020, but these newest observations seem to support predictions made by chemistry-climate models and that the hole won't begin to disappear until 2040 or later according to the World Meteorological Organization Global Research and Monitoring Project's 2014 report. Follow Elizabeth Newbern @liznewbern. Follow Live Science @livescience, Facebook & Google+. Original article on Live Science.
1.1 2.1 3.1 3.2 4.1 5.1 6.1 7.1 8.1 9.1 10.1 11.1 12.1 12.2 13.1 14.1 15.1 15.2 16.1 17.1 18.1 18.2 19.1 20.1 21.1 21.2 22.1 23.1 24.1 25.1 26.1 27.1 27.2 27.3 27.4 28.1 29.1 30.1 30.2 31.1
Tag: ozonska rupa Ozonska rupa ipak se smanjuje? Nakon prilično standardnog početka, ozonska rupa iz 2021. značajno je narasla u posljednjih tjedan dana i sada je veća od 75 % ozonskih rupa u toj fazi sezone od 1979. godine. Tijekom… više » Ozonska rupa nad Antarktikom dosegnula rekordnu veličinu Ozonski omotač u gornjem dijelu Zemljine atmosfere apsorbira većinu dolazećeg ultraljubičastog zračenja sunca koje bi u suprotnom štetilo životu na našem planetu, piše… više » Otkrivena prva ozonska rupa iznad Arktika U posljednja dva tjedna debljina ozonskog omotača na Arktiku bila je ispod debljine ozonskog omotača na Antarktici gdje se nalazi ozonska rupa, izjavio je Markus Rex, voditelj odsjeka za… više » Ozonska rupa je manja, ali... Oporavak ozonskog omotača iznad Antarktike ne smijemo shvaćati zdravo za gotovo te i dalje moramo biti oprezni, poruka je dr. Jonathana Shanklina, jednog od znanstvenika koji je prvi,… više » Ozonska rupa nad Antarktikom najmanja i najčudnija do sada Ozonska rupa koja se svake godine otvara iznad Antarktike na putu je da postane najmanja u posljednja tri desetljeća, kažu znanstvenici. No ono što im definitivno nije jasno je čudan… više » Ozonska rupa najmanja u zadnja tri deseteljeća Ozonska rupa nad Antarktikom ove bi godine mogla biti najmanja u posljednjih 30 godina, kažu znanstvenici. Analiza raspadanja tog plina visoko u atmosferi pokazuje da ove godine nije tako… više » Kineski građevinci šire ozonsku rupu? Jeftina izolacija kuća u Kini mogla bi biti odgovorna za ogroman rast emisija plina koji jako oštećuje ozonski omotač, javlja BBC. Organizacija za praćenje onečišćenja… više » Ozonska rupa počinje polagano zacjeljivati Ozonska rupa iznad Antarktike se smanjuje, tvrde znanstvenici koji su izmjerili da je u rujnu 2015. rupa bila oko 4 milijuna četvornih kilometara manja nego godine 2000.To se postignuće… više » Ozonska rupa će - nestati! Ozonska rupa nije uvijek tu i nije uvijek na istom mjestu. "Trenutno se upravo stvara iznad Antarktika. I tamo će biti jednako velika kao posljednjih godina", kaže Markus Rex. Fizičar iz… više » Ozonska rupa iznad Antarktike se smanjuje Ozonska rupa iznad Antarktike se smanjuje i najmanja je u posljednjih pet godina, priopćio je u petak novozelandski Nacionalni institut za istraživanje vode i atmosfere (NIWA). Znanstvenih… više »