{"id":7021,"date":"2015-10-19T15:17:01","date_gmt":"2015-10-19T15:17:01","guid":{"rendered":"https:\/\/www.bioecoactual.com\/2015\/10\/19\/els-nivells-de-gasos-d-efecte-hivernacle-son-els-mes-alts-en-800-000-anys\/"},"modified":"2017-03-30T11:27:12","modified_gmt":"2017-03-30T11:27:12","slug":"els-nivells-de-gasos-d-efecte-hivernacle-son-els-mes-alts-en-800-000-anys","status":"publish","type":"post","link":"https:\/\/www.bioecoactual.com\/ca\/2015\/10\/19\/els-nivells-de-gasos-d-efecte-hivernacle-son-els-mes-alts-en-800-000-anys\/","title":{"rendered":"Els nivells de gasos d’efecte hivernacle s\u00f3n els m\u00e9s alts en 800.000 anys"},"content":{"rendered":"

EFE Verde 19\/10\/2015<\/a>
<\/strong><\/em>Els nivells de gasos d’efecte hivernacle s\u00f3n els m\u00e9s alts en 800.000 anys.<\/strong><\/p>\n

Els nivells dels gasos d’efecte hivernacle ben barrejats m\u00e9s importants, que s\u00f3n di\u00f2xid de carboni (CO2), met\u00e0 (CH4) i \u00f2xid nitr\u00f3s (N2O), s\u00f3n els m\u00e9s alts dels \u00faltims 800.000 anys, ha dit a Efe el f\u00edsic \u00c0ngel G\u00f3mez, de l’Observatori Atmosf\u00e8ric d’Iza\u00f1a, a Tenerife.<\/p>\n<\/p>\n

<\/p>\n

(Imatge: Torres de perforaci\u00f3 a Mar Caspi. EFE\/Sergei Ilnitsky)<\/span><\/p>\n

\n

“L’estudi dels nivells dels gasos d’efecte hivernacle, que van comen\u00e7ar a Hawaii en els anys cinquanta del segle passat, es realitzen tamb\u00e9 a Tenerife des de 1984, i pel que fa al passat es coneixen en estudiar les bombolles d’aire atrapades en les plaques de gel de L’Ant\u00e0rtida i Groenl\u00e0ndia”, va explicar \u00c1ngel G\u00f3mez.<\/p>\n<\/blockquote>\n

L’efecte hivernacle sempre ha existit per\u00f2 s’est\u00e0 incrementant des de la revoluci\u00f3 industrial, ha assenyalat \u00c0ngel G\u00f3mez, de l’Ag\u00e8ncia Estatal de Meteorologia (Aemet), que ha afegit que amb aquest increment s’est\u00e0 produint en la superf\u00edcie de la Terra un augment de temperatura , que \u00e9s molt lent a causa de que l’aigua profunda dels oceans tarda molt en escalfar.<\/p>\n

Observatori Atmosf\u00e8ric d’Iza\u00f1a:<\/h3>\n

Els gasos d’efecte hivernacle a l’Observatori Atmosf\u00e8ric d’Iza\u00f1a es mesuren cont\u00ednuament (24 hores al dia tots els dies de l’any), i si b\u00e9 l’\u00f2xid nitr\u00f3s i l’hexafluorur de sofre (SF6) es mesuren des de 2007, el met\u00e0 i el di\u00f2xid de carboni s’analitzen des de 1984.<\/p>\n

\u00c1ngel G\u00f3mez ha explicat que si b\u00e9 el mon\u00f2xid de carboni (CO) no \u00e9s un gas d’efecte hivernacle influeix en la qu\u00edmica del met\u00e0, que s\u00ed que ho \u00e9s, de manera que si hi ha m\u00e9s del primer hi ha una mica m\u00e9s del segon.<\/p>\n

\n

El mon\u00f2xid de carboni i el met\u00e0 s\u00f3n gasos de vida relativament curta en l’atmosfera, ja que el primer segueix a la seu pocs mesos i el segon uns nou anys, mentre que el di\u00f2xid de carboni es mant\u00e9 durant centenars d’anys, l’\u00f2xid nitr\u00f3s uns 120 anys i l’hexafluorur de sofre al voltant dels 3.200 anys.<\/p>\n<\/blockquote>\n

La difer\u00e8ncia entre ambd\u00f3s tipus de gasos \u00e9s important, ja que per als primers es pot arribar a un equilibri entre emissi\u00f3 i destrucci\u00f3, en aquest cas la concentraci\u00f3 del gas romandria constant en l’atmosfera, mentre que per als segons la concentraci\u00f3 del gas a l’atmosfera continua creixent mentre hi hagi emissions.<\/p>\n

Aix\u00f2 explica perqu\u00e8 les concentracions mesures a l’Observatori Atmosf\u00e8ric d’Iza\u00f1a sempre creixen per di\u00f2xid de carboni, \u00f2xid nitr\u00f3s i hexafluorur de sofre, mentre que la concentraci\u00f3 de met\u00e0 ha tingut per\u00edodes de no creixement, i la de mon\u00f2xid de carboni fins i tot decreix.<\/p>\n

\n

Impacte d’emissions:<\/p>\n<\/h3>\n

\u00c1ngel G\u00f3mez ha indicat que l’impacte de les emissions<\/strong> dels diversos gasos en cert instant del futur es quantifica mitjan\u00e7ant el Potencial de canvi de la Temperatura Global (GTP), que es basa en el canvi de la Temperatura Superficial Global Media (GMST) provocat per aquestes emissions per a diferents horitzons temporals utilitzant com a refer\u00e8ncia el que provoca el di\u00f2xid de carboni.<\/p>\n

El Potencial de canvi de la temperatura global a un horitz\u00f3 de deu anys per a les emissions presents de met\u00e0 \u00e9s gaireb\u00e9 igual al provocat per les emissions de di\u00f2xid de carboni, per\u00f2 \u00e9s poc m\u00e9s de la meitat per a un horitz\u00f3 de vint anys, i menyspreable per un horitz\u00f3 de cent anys, ja que el met\u00e0 em\u00e8s cent anys abans haur\u00e0 estat gaireb\u00e9 completament destru\u00eft.<\/p>\n

No obstant aix\u00f2, el GTP per a les emissions presents d’\u00f2xid nitr\u00f3s<\/strong> roman constant en aquests horitzons temporals, ja que la seva vida mitjana \u00e9s llarga i semblant a la del di\u00f2xid de carboni.
Els valors mitjans de l’atmosfera de fons mesurats a l’Observatori Atmosf\u00e8ric d’Iza\u00f1a durant l’any passat van mostrar que per cada mili\u00f3 de mol\u00e8cules en l’atmosfera 398,6 part\u00edcules eren de di\u00f2xid de carboni, 1,86 de met\u00e0, 0,3277 d’\u00f2xid nitr\u00f3s, ,00000842 d’hexafluorur de sofre i 0,0923 de mon\u00f2xid de carboni.<\/p>\n

El creixement anual mitj\u00e0 de di\u00f2xid de carboni<\/strong> de l’\u00faltima d\u00e8cada ha estat de 2,1 part\u00edcules per mili\u00f3 a l’any, mentre que l’augment d’\u00f2xid nitr\u00f3s ha estat de 0,00089 part\u00edcules per mili\u00f3 a l’any i l’increment del hexafluorur de sofre de 0,00000030 part\u00edcules per mili\u00f3 a l’any.<\/p>\n

El vapor d’aigua (H2O)<\/strong> tamb\u00e9 \u00e9s un gas d’efecte hivernacle important, per\u00f2 la seva concentraci\u00f3 en l’atmosfera varia molt\u00edssim d’un lloc a un altre i tamb\u00e9 en al\u00e7ada, ja que la seva concentraci\u00f3 no est\u00e0 determinada per les emissions procedents de l’evaporaci\u00f3 de aigua l\u00edquida en oceans, llacs i rius, evapotranspiraci\u00f3 de les plantes i del s\u00f2l i altres, sin\u00f3 per factors meteorol\u00f2gics complexos com temperatura, vent, localitzaci\u00f3 de les borrasques i anticiclons.<\/p>\n

El vapor d’aigua desapareix de l’atmosfera mitjan\u00e7ant la seva condensaci\u00f3 en forma d’aigua l\u00edquida en n\u00favols, que \u00e9s posteriorment retornada a la superf\u00edcie de la terra mitjan\u00e7ant la precipitaci\u00f3 en forma de pluja.<\/p>\n

Per tot aix\u00f2, l’impacte del vapor d’aigua en l’increment de l’efecte hivernacle es t\u00e9 en compte en forma de retroalimentaci\u00f3: l’augment dels gasos d’efecte hivernacle ben barrejats, augmenta la temperatura de la baixa atmosfera, i aquest increment de temperatura permet que una major quantitat de vapor d’aigua pugui romandre en l’atmosfera.<\/p>\n

Font: <\/strong>EFE Verde – www.efeverde.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

EFE Verde 19\/10\/2015Els nivells de gasos d’efecte hivernacle són els més alts en 800.000 anys. Els nivells dels gasos d’efecte hivernacle ben barrejats més importants, que són diòxid de carboni (CO2), metà (CH4) i òxid nitrós (N2O), són els més alts dels últims 800.000 anys, ha dit a Efe el físic Àngel Gómez, de l’Observatori […]<\/p>\n","protected":false},"author":419,"featured_media":7019,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7164],"tags":[174,70,132],"class_list":["post-7021","post","type-post","status-publish","format-standard","has-post-thumbnail","category-actualitat","tag-co2","tag-contaminacion","tag-medioambiente"],"yoast_head":"\nEls nivells de gasos d'efecte hivernacle s\u00f3n els m\u00e9s alts en 800.000 anys - Bio Eco Actual<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bioecoactual.com\/2015\/10\/19\/los-niveles-de-gases-de-efecto-invernadero-son-los-mas-altos-en-800-000-anos\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Els nivells de gasos d'efecte hivernacle s\u00f3n els m\u00e9s alts en 800.000 anys\" \/>\n<meta property=\"og:description\" content=\"EFE Verde 19\/10\/2015Els nivells de gasos d’efecte hivernacle són els més alts en 800.000 anys. 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