SD Dojavi
OSMRTNICE
PRETPLATA
PREMIUM
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Prošlog ljeta, više od 100 milja obalnih voda Floride postalo je mrtva zona osiromašena kisikom, prepuna mrtve plutajuće ribe. Na drugoj strani zemlje, nepregledne lešine rakova su nasukane na obalu Oregona, nesposobni pobjeći iz vode koja je postala sezonski osiromašena kisikom u posljednja dva desetljeća.

Dok se velik dio diskusije oko klimatske krize usredotočuje na emisiju stakleničkih plinova i njihov učinak na zagrijavanje, oborine, porast razine mora i zakiseljavanje oceana, malo se govori o učinku klimatskih promjena na razinu kisika, osobito u oceanima i jezerima. Voda bez odgovarajućeg kisika ne može podržati život, a za tri milijarde ljudi čiji prihodi ovise o obalnom ribarstvu, opadanje razine kisika u oceanu je katastrofalno, piše Scientific American.

Kako se količina CO2 povećava u atmosferi, ona ne samo da zagrijava zrak zadržavajući zračenje, već zagrijava i vodu. Interakcija oceana i atmosfere složena je i isprepletena, ali pojednostavljeno, oceani su preuzeli oko 90 posto viška topline stvorene klimatskim promjenama tijekom antropocena. Vodena tijela mogu apsorbirati CO2 i O2, ali samo do granice ovisno o temperaturi. Topljivost plina opada s temperaturama zagrijavanja; odnosno toplija voda zadržava manje kisika. Ovo smanjenje sadržaja kisika, zajedno s velikim odumiranjem fitoplanktona koji stvara kisik, što je rezultat ne samo klimatskih promjena, već i zagađenja plastikom i industrijskog otjecanja, ugrožava ekosustave, guši morski život i dovodi do daljnjeg izumiranja. Veliki dijelovi oceana izgubili su 10-40 posto kisika, a očekuje se da će se taj gubitak ubrzati s klimatskim promjenama.

U posljednjih 200 godina, ljudi su pokazali izuzetnu sposobnost u mijenjanju planete kroz stvaranje poremećaja u vremenskim okvirima u kojima Zemlja cirkulira kemikalije kao što je CO2. Uvid u promjene ekosustava na fizikalnoj i kemijskoj razini može prokrčiti put novim pristupima klimatskim rješenjima – onima koji obuhvaćaju poboljšanu spoznaju o sustavima za održavanje života našeg planeta i nadopunjuju naše razumijevanje potrebitih smanjenja emisija ugljičnog dioksida. Otprilike 40 posto živog svijeta ovisi o oceanu. Ako se ne zaustavi proces daljnjeg izgladnjivanja morskog života kisikom, desiti će se najgore veliko izumiranje podmornog svijeta u povijesti planeta Zemlje.

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Krivi su zagađenje plastikom, industrijskim otpadom i CO2. 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Prošlog ljeta, više od 100 milja obalnih voda Floride postalo je mrtva zona osiromašena kisikom, prepuna mrtve plutajuće ribe. Na drugoj strani zemlje, nepregledne lešine rakova su nasukane na obalu Oregona, nesposobni pobjeći iz vode koja je postala sezonski osiromašena kisikom u posljednja dva desetljeća.

Dok se velik dio diskusije oko klimatske krize usredotočuje na emisiju stakleničkih plinova i njihov učinak na zagrijavanje, oborine, porast razine mora i zakiseljavanje oceana, malo se govori o učinku klimatskih promjena na razinu kisika, osobito u oceanima i jezerima. Voda bez odgovarajućeg kisika ne može podržati život, a za tri milijarde ljudi čiji prihodi ovise o obalnom ribarstvu, opadanje razine kisika u oceanu je katastrofalno, piše Scientific American.

Kako se količina CO2 povećava u atmosferi, ona ne samo da zagrijava zrak zadržavajući zračenje, već zagrijava i vodu. Interakcija oceana i atmosfere složena je i isprepletena, ali pojednostavljeno, oceani su preuzeli oko 90 posto viška topline stvorene klimatskim promjenama tijekom antropocena. Vodena tijela mogu apsorbirati CO2 i O2, ali samo do granice ovisno o temperaturi. Topljivost plina opada s temperaturama zagrijavanja; odnosno toplija voda zadržava manje kisika. Ovo smanjenje sadržaja kisika, zajedno s velikim odumiranjem fitoplanktona koji stvara kisik, što je rezultat ne samo klimatskih promjena, već i zagađenja plastikom i industrijskog otjecanja, ugrožava ekosustave, guši morski život i dovodi do daljnjeg izumiranja. Veliki dijelovi oceana izgubili su 10-40 posto kisika, a očekuje se da će se taj gubitak ubrzati s klimatskim promjenama.

U posljednjih 200 godina, ljudi su pokazali izuzetnu sposobnost u mijenjanju planete kroz stvaranje poremećaja u vremenskim okvirima u kojima Zemlja cirkulira kemikalije kao što je CO2. Uvid u promjene ekosustava na fizikalnoj i kemijskoj razini može prokrčiti put novim pristupima klimatskim rješenjima – onima koji obuhvaćaju poboljšanu spoznaju o sustavima za održavanje života našeg planeta i nadopunjuju naše razumijevanje potrebitih smanjenja emisija ugljičnog dioksida. Otprilike 40 posto živog svijeta ovisi o oceanu. Ako se ne zaustavi proces daljnjeg izgladnjivanja morskog života kisikom, desiti će se najgore veliko izumiranje podmornog svijeta u povijesti planeta Zemlje.

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Gabriel Bouys/ AFP
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StoryEditorOCM
SvijetJEDITE RIBU, NEĆETE DUGO

More zagrijavanjem izgubilo i do 40 posto kisika. Krivi su zagađenje plastikom, industrijskim otpadom i CO2. Prijeti izumiranje svega što pliva

Piše Marin Prvan
30. studenog 2021. - 21:00
20168566
PREMIUM
Gabriel Bouys/ AFP

Prošlog ljeta, više od 100 milja obalnih voda Floride postalo je mrtva zona osiromašena kisikom, prepuna mrtve plutajuće ribe. Na drugoj strani zemlje, nepregledne lešine rakova su nasukane na obalu Oregona, nesposobni pobjeći iz vode koja je postala sezonski osiromašena kisikom u posljednja dva desetljeća.

Dok se velik dio diskusije oko klimatske krize usredotočuje na emisiju stakleničkih plinova i njihov učinak na zagrijavanje, oborine, porast razine mora i zakiseljavanje oceana, malo se govori o učinku klimatskih promjena na razinu kisika, osobito u oceanima i jezerima. Voda bez odgovarajućeg kisika ne može podržati život, a za tri milijarde ljudi čiji prihodi ovise o obalnom ribarstvu, opadanje razine kisika u oceanu je katastrofalno, piše Scientific America...

#KLIMATSKE PROMIJENE#MORE#KISIK
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15. svibanj 2024 16:15