2010
GASES DE EFECTO INVERNADERO
“AÑO DE LA CONSOLIDACIÓN DE LAS NACIONES UNIDAS”
FACULTAD DE INGENIERÍA QUÍMICA
GASES DE EFECTO INVERNADERO NOMBRE: DONAYRE ORMEÑO, Jherson
AÑO:
3
CICLO:
VI
INGENIERA:
Ica – 2010
TERMODINAMICA
Página 1
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GASES DE EFECTO INVERNADERO
2010
INTRODUCCION •
La Tierra recibe energía del Sol a la forma de radiación elect lectro rom magné agnéti tica ca,, la super uperfficie icie terr terreestre tre reci recibe be radiación ultravioleta (UV) y radiación visible y emite radiación terrestre a la forma de radiación infrarroja. Estos dos grandes flujos energéticos deben estar en balance. Pero la atmósfera afecta la naturaleza de este bal balan ance ce.. Los gase ases inver nverna nade dero ro permit rmiten en que la radiación de onda corta solar penetre sin impedimento pero absorben la mayor parte de la emisión de ondas larga argass ter terres restres res. Por ello llo la temp emperatu ratura ra globa loball promedio es de 288 ºK o 15°C, 33 grados más alto que si no tuviera atmósfera. Este efecto se llama el "Efecto Invernadero" (GCCIP, 1997)
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GASES DE EFECTO INVERNADERO
2010
OBJETIVOS: • Entender en qué consiste el efecto invernadero. • Relacionar el efecto invernadero con el aumento global de temperatura en la superficie terrestre y ésta, con el cambio climático de la Tierra. • Qué acciones del hombre influyen gravemente sobre éste problema. • Qué acciones del hombre ayudarían a prevenirlo o minimizarlo.
EFECTO INVERNADERO La Tierra debido a su fuerza de gravedad retiene en su superficie al aire y al agua del mar, y para poner en movimiento al aire y al mar en relación con la superficie del planeta se necesita la energía cuya fuente primaria es el Sol, que emite en todas direcciones un flujo de luz visible o próxima a la radiación radiación visible, visible, en las zonas del ultravioleta ultravioleta y del infrarrojo. De acue acuerd rdoo con con los los plan plante team amie ient ntos os de Sa Sadi di-Carnot acerca del funcionamiento de la máquina de vapor, se sabe que la transformación de la energía térmica en energía mecánica no puede ser total. Un motor térmico requiere de una fuente caliente que suministre la energía térmica y una fuente fría que la reciba. reciba. Al considerar considerar a la Tierra como un motor térmico, la fuente que suministra la ener energí gíaa térm térmic icaa es la supe superf rfic icie ie del del suel sueloo calentada por la radiación solar y la fuente fría está localizada en las capas altas de la atmósfera, enfr enfria iada da cont contin inua uame ment ntee por por la pérdi pérdida da de ener energí gíaa en form formaa de radi radiaci ación ón infrarroja emitida por el suelo caliente hacia el espacio sideral.
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GASES DE EFECTO INVERNADERO
2010
La Tierra solamente recibe una pequeña cantidad de la energía emitida por el Sol. La luz solar no se utiliza directamente, sino en forma de calor, por lo tanto, es necesario que la atmósfera transforme la energía térmica de la radiación solar en energía mecánica del viento. La fuente de calor para la atmósfera es la superficie del suelo calentada por la luz solar que luego es emitida como radiación infrarroja hacia el espacio. El efecto invernadero es uno de los principales factores que provocan el calentamiento global de la Tierra, Tierra, debido a la acumulación de los llamados gases invernadero CO2, H2O, O3, CH4 y CFC´s en la atmósfera. El matemático francés Jean B. J. Fourier planteó que la Tierra es un planeta azul debido a su atmósfera y que sería un planeta negro si careciera de ella y que se congelaría el agua si no tuviera la mezcla de gases que forman su atmósfera. En 1827 comparó la influencia de la atmósfera terrestre con un invernadero y dijo que los gases que forman la atmósfera de la Tierra servían como las paredes de cristal de un invernadero para mantener el calor. El físico irlandés John Tyndall, en 1859, descubrió que ni el oxígeno ni el nitrógeno producen efecto invernadero, lo cual indica que el 99 % de los componentes de la atmósfera no producen efecto invernadero y que el agua, el
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GASES DE EFECTO INVERNADERO
2010
fotosíntesis). También que la disminución de la concentración del bióxido de fotosíntesis). carbono en la atmósfera provocaría el enfriamiento del planeta y que ésta podría ser la explicación de las glaciaciones en la Tierra. Las moléculas de oxígeno, nitrógeno, agua, anhídrido carbónico y del ozono son casi transparentes transparentes a la luz solar pero las moléculas moléculas de CO2 , H 2O, O 3 , CH 4 y CFC´s CFC´s son parcia parcialme lmente nte opacas opacas a las radiac radiacion iones es infrar infrarroj rojas, as, es decir, decir, que abso ab sorb rben en a las las radi radiac acio ione ness infr infrar arroj rojas as emit emitid idas as por por el suel sueloo que que ha sido sido calentado por la luz solar. Cuando la radiación infrarroja choca con las moléculas de CO 2 , H 2O, O 3 , CH4 y CFC´s es absorbida por ellas. Estas moléculas que vibran, se mueven y emiten ener energí gíaa en forma forma de rayo rayoss invi invisi sibl bles es e infr infrar arroj rojos, os, prov provoca ocan n el fenó fenóme meno no conocido como efecto invernadero, que mantiene caliente la atmósfera terrestre. Las radiaciones rebotan entre la mezcla de moléculas que componen a la atmósfera hasta que finalmente escapan al espacio sideral. El térm términ inoo efec efecto to inve invern rnad ader eroo apli aplica cado do a la Tier Tierra ra se refi refier eree al posi posibl blee calentamiento global debido a la acumulación de los gases de invernadero prov provoca ocada da por por la acti activi vida dad d huma humana na,, prin princi cipa palm lmen ente te desd desdee la revo revolu luci ción ón industrial por la quema de combustibles fósiles y la producción de nuevos productos químicos.
El químico sueco Svante A. Arrhenius, en 1896, planteó que la concentración de
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GASES DE EFECTO INVERNADERO
2010
del anhídrido carbónico de la atmósfera, la temperatura promedio de la Tierra aumentaría entre 5 y 6ºC. Aunque se conocía el efecto invernadero, durante la primera mitad del siglo XX los investi investigad gadores ores de la Tierra Tierra no lo consid considera eraron ron como un proble problema ma de la estabilidad del planeta, ya que antes consideraban que los océanos podían absorber al anhídrido carbónico formando carbonato de calcio (CaCO 3) que caería al fondo del mar sin causar ningún daño. La radiación infrarroja es absorbida en mayor cantidad por el vapor de agua, le sigue el anhídrido carbónico y luego el ozono, pero de estos 3 compuestos químicos es el anhídrido carbónico el que produce mayor efecto invernadero porque el hombre hombre está incrementando incrementando su concentración concentración como consecuencia consecuencia de las actividades que realiza. Se considera que sin el efecto invernadero producido por el bióxido de carbono natural la temperatura de la Tierra sería de alrededor de 20 ºC bajo cero ( - 20 ºC).
GAS DE EFECTO INVERNADERO: Se denominan gases de efecto invernadero (GEI) o gases de invernadero a los gases cuya presencia en la atmósfera contribuye al efecto invernadero. invernadero. Los Los más más impor importa tant ntes es están están prese present ntes es en la atmó atmósf sfer eraa de mane manera ra natur natural al,, aunque su concentración puede verse modificada por la actividad humana, pero también entran en este concepto algunos gases artificiales, producto de la industria. Esos gases contribuyen más o menos de forma neta al efecto invernadero por la estructura de sus moléculas y, de forma sustancial, por la cantidad de moléculas del gas presentes en la atmósfera. De ahí que por ejemplo, el SF6, sea una eficaz molécula de EI, pero su contribución es absolutamente ínfima al EI. El clima de la Tierra está condicionado por la presencia de gases naturales de efec efecto to inver inverna nade dero, ro, que que ab absor sorbe ben n parci parcial alme ment ntee la emisi emisión ón de radi radiac ació ión n infrar infrarroj rojaa que emite emite la superfi superficie cie,, re-emi re-emitie tiendo ndo radiac radiación ión del mismo mismo tipo tipo (infrarroja), tanto al espacio exterior como hacia la superficie. Estos gases, entre los cuales están el dióxido de carbono (CO2), el vapor de agua y el ozono (O3), regulan la temperatura del planeta, contribuyendo que a nivel del mar mar ésta ésta sea sea cons consid ider erab able leme ment ntee mayo mayorr que que la que que se obse observ rvar aría ía si la atmósfera no tuviera estos componentes.
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GASES DE EFECTO INVERNADERO
2010
El efecto invernadero ha estado siempre presente desde el momento que se formó la atmósfera, contribuyendo en forma determinante al desarrollo de la vida sobre la Tierra. Lo que está en juego por acción del hombre es su intensificación, y el impacto negativo que esto puede representar. Para una descripción más completa de este fenómeno ver Estructura y Composición de la Atmósfera en la sección Temas. La actividad del hombre, principalmente la actividad industrial, ha producido una significativa significativa emisión emisión a la atmósfera de gases de efecto invernadero, invernadero, que no estaban presentes en la era pre-industrial. Su capacidad de influir sobre el clima global se explica por la larga vida media de much muchos os de ello ellos, s, que que a pesa pesarr de una una emis emisió ión n loca locali liza zada da,, term termin inan an distribuyéndose en toda la atmósfera.
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GASES DE EFECTO INVERNADERO
2010
Entre los gases se encuentran el dióxido de carbono, el metano y el óxid óxidoo nitr nitros oso, o, que que son son libe libera rado doss por por la indu indust stri riaa mode modern rna, a, la agricultura y la combustión de combustibles fósiles (carbón, petróleo, gases naturales).
Sus concentraciones en la atmósfera están aumentando. Sólo la del dióxido de carbono ha crecido en más de un 30% desde 1980.
La mayoría de los científicos acepta la teoría de que el aumento de estos gases provocará que suba la temperatura terrestre.
- DI DIÓX ÓXID IDO O DE CA CARB RBON ONO: O: •
Es el más importante de los gases menores, involucrado en un complejo cicl cicloo glob global al.. En la actu actual alid idad ad su conc concen entr trac ació ión n ha lleg llegad adoo a 359 359 ppmm(partes por millón volumen), producto de la acción antropogénica: quema de combustibles fósiles y materia orgánica en general.
•
Fuente Fuentess natura naturales les:: respir respiraci ación, ón, descomp descomposi osició ción n de materi materiaa orgáni orgánica, ca, incendios forestales naturales.
•
Fuentes Fuentes antropogéni antropogénicas: cas: quema de combustibles combustibles fósiles, cambios cambios en uso de suel suelos os (pri (princ nciipalm palmen ente te def defores oresta taci ción ón), ), quem quemaa de biom biomas asa, a, manufactura de cemento.
•
Sink Sink:: ab absor sorci ción ón por las las agua aguass oceá oceáni nica cas, s, y organ organis ismos mos mari marino noss y terrestres, especialmente bosques y fitoplancton.
•
Ciclo de vida: entre 50 y 200 años.
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GASES DE EFECTO INVERNADERO
- CICLO DE DEL CA CARBONO:
2010
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GASES DE EFECTO INVERNADERO
2010
- METANO: •
Otro gas de invernadero, CH4, el metano es producido principalmente a través de procesos anaeróbicos tales como los cultivos de arroz o la digestión animal. Es destruida en la baja atmósfera por reacción con radicales hidroxilo libres (-OH). Como el CO2, sus concentraciones aumentan por acción antropogénica directa e indirecta.
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GASES DE EFECTO INVERNADERO
2010
- OXIDO NITROSO: •
El óxido nitroso (N2O) es producido por procesos biológicos en océanos y suelos, también por procesos antropogénicos que incluyen combustión industrial, gases de escape de vehículos de combustión interna, etc. Es destruido foto-químicamente en la alta atmósfera.
•
Fuentes: producido naturalmente en océanos y bosques lluviosos.
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GASES DE EFECTO INVERNADERO
2010
- OZONO: •
El ozono (O3) en la estratosfera filtra los UV dañinos para las estructuras biológicas, es también un gas invernadero que absorbe efectivamente la radiación infrarroja.
•
La concentración de ozono en la atmósfera no es uniforme sino que varía
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GASES DE EFECTO INVERNADERO
2010
aerosoles, aerosoles, en la fabricación fabricación de espuma, etc. Existen Existen fuentes naturales en las que se producen compuestos relacionados, como los metilhaluros. •
No existen sinks para los CFCs en la troposfera y por motivo de su casi inexis inexisten tente te reacti reactivida vidad d son transpo transporta rtadas das a la estrat estratosf osfera era donde donde se degradan por acción de los UV, momento en el cual liberan átomos libres de cloro que destruyen efectivamente el ozono.
•
Hidrocloro Hidroc loroflu fluoro orocarb carbono onoss (HC (HCFCs FCs)) e Hid Hidrof rofluo luoroc rocarbo arbonos nos (HFCs): Compuestos de origen antrópico que están usándose como sustitutos de los CFCs, sólo considerados como transicionales, pues también tienen efectos de gas invernadero. Estos se degradan en la troposfera por acción de fotodisociación.
•
Por la larga vida que poseen son gases invernadero miles de veces más potentes que el CO2.
- AGUA – AEROSOLES: •
AGUA: El vapor de agua es un constituyente vital de la atmósfera, en promedio 1% por volumen, aunque con variaciones significativas en las escalas temporales y espaciales. Por su abundancia es el gas de invernadero de mayor importancia, jugando un rol de vital importancia en el balance
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GASES DE EFECTO INVERNADERO
2010
PRINCI PRIN CIPA PALE LES S PA PAIS ISES ES PR PROD ODUC UCTO TORE RES S DE GA GASE SES S DE EFECTO INVERNADERO: INVERNADERO:
¿QUÉ PRUEBAS HAY DEL CALENTAMIENTO GLOBAL?
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GASES DE EFECTO INVERNADERO
2010
La mayoría de los glaciares no polares estudiados están disminuyendo y algunas mediciones indican que el hielo ártico se ha reducido en cerca de un 40% en los veranos y otoños de las últimas décadas. También También hay otras anomalías: anomalías: partes de la Antártida parecen estar volviéndose volviéndose más frías y hay discrepancias discrepancias entre los cambios cambios de temperatura temperatura en la superficie superficie y en la troposfera
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GASES DE EFECTO INVERNADERO
2010
CONSECUENCIAS DEL CAMBIO CLIMÁTICO: Las zonas climáticas y agrícolas podrían desplazarse hacia los polos. Se prevé que en las regiones de latitud media el desplazamiento desplazamiento será de entre 200 y 300
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2010
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GASES DE EFECTO INVERNADERO
2010
El calentamiento global podría exterminar a una cuarta parte de todas las especies de plantas y animales de la Tierra para 2050, en una de las extinciones en masa masa más más gran grande dess desd desdee la de los dino dinosa saur urio ios, s, reve revelló un estu estudi dioo internacional.
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GASES DE EFECTO INVERNADERO
2010
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GASES DE EFECTO INVERNADERO
2010
4.
Limp Limpie ie regu regula larm rmen ente te los los quem quemad ador ores es de la coci cocina na:: si se atas atasca can n consumen un 10% más de lo que debieran.
5.
Revise su calentador al menos una vez al año.
6.
Descongele su frigorífico: la escarcha crea un aislamiento que puede acarrear un 20% de consumo eléctrico suplementario.
7.
Compr Compree alim alimen ento toss de temp tempor orad adaa e idea idealm lmen ente te produ produci cidos dos en su localidad. Son más baratos desde el punto de vista del transporte y la refrigeración.
8.
Pref Prefie iera ra alim alimen ento toss orgá orgáni nicos cos.. Las Las gran granja jass de produ producc cció ión n inte intensi nsiva va pierden al año cuatro veces más tierra de labranza que las granjas orgánicas.
9.
Produzca Produzca menos basura: recicle, recicle, reutilice, reutilice, repare. El papel, papel, por ejemplo, es una de las principales fuentes de metano. Comparta la suscripción a periódicos y revistas con sus amigos, después de leerlos use los diarios
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GASES DE EFECTO INVERNADERO
2010
GASES DE EFECTO INVERNADERO EN LA REGIÓN ICA El cambio climático es un hecho probado a pesar de que un sector de la población se lo cuestione Cambio climático, una asignatura pendiente. A día de hoy podemos decir que el cambio climático es un hecho científico indiscutible, aunque un cierto sector de la población se lo cuestione. La Tierra sufre un proceso acelerado de calentamiento global debido al aumento de la temperatura media de la atmósfera y de los océanos. La causa principal es un incremento de las emisiones de dióxido de carbono (CO2), que se produce artifi artificia cialme lmente nte en la quema quema de combusti combustible bless fósile fósiless (carbó (carbón, n, petról petróleo, eo, gas natural, etcétera) por parte de los países industrializados durante los últimos 200 años. ños. Este ste fenóm enómen enoo ha acen acentu tuaado el efe efecto cto inve invern rnaadero dero y las consecuencias desde hace algún tiempo empiezan a notarse.
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GASES DE EFECTO INVERNADERO
2010
objetivos de Kioto, con un aumento del 48% de las emisiones de CO2 con respecto a los niveles de 1990, triplicando las emisiones permitidas por el Protocolo de Kioto para 2008-2012. La principal causa del cambio climático, según el Panel Intergubernamental sobr sobree Camb Cambio io Clim Climát átic ico, o, es la quema quema de combu combusti stibl bles es fósi fósile less cuyo cuyo mayo mayorr contribuyente, en España, es el sector energético. El 80% de nuestra energía depende todavía de los combustibles fósiles (petróleo, carbón y gas natural). La demanda de energía en España actualmente muestra un aumento medio anual de un 3 a un 4%. Se trata de un aumento injustificado, ya que en nuestro país se
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GASES DE EFECTO INVERNADERO
2010
un impacto sobre su salud. Los optimistas, donde el asunto los inquieta, pero confí confían an en que que las las gran grande dess indu industr stria ias, s, el Gobi Gobier erno no y las las perso persona nass están están buscando salidas para paliar el cambio climático. Los medio atemorizados, éstos temen que los intereses económicos estén frenando la búsqueda de soluciones. Los con confusos sos, que no tienen una una opinión formada, aunque están moderadamente preocupados, consideran importante que la industria y los gobiernos planten cara al fenómeno. Y, por último, los escépticos, los no crey creyen ente tes, s, que que no pien piensa san n que que exis exista ta el camb cambio io clim climát átic icoo y, por por tant tanto, o, consideran que no hay que tomar ninguna medida. Ustedes piensen lo que quieran, pero al menos seamos todos consecuentes.
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GASES DE EFECTO INVERNADERO
2010
TBC o diabetes son obligados a trabajar en medio de la inmundicia sin medidas mínimas de protección adecuadas.
ENTROPÍA Y SU INFLUENCIA EN EL CALENTAMIENTO GLOBAL
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GASES DE EFECTO INVERNADERO
2010
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GASES DE EFECTO INVERNADERO
2010
Los GEI son esenciales para la vida en la Tierra, pues hacen que parte del calor emitido por le sol quede atrapado manteniendo una temperatura media global de 15º C en lugar de -18º C, pues absorben absorben el calor generado generado por el sol (fotones infrarrojos), reteniéndolo dentro de la atmósfera, generando lo que se conoce como “Calentamiento Global” (Fuente Glosario IPCC). El problema actual se ha generado por la exagerada presencia de estos gases, ocasionando el aumento de la temperatura del aire y de la superficie terrestre más allá de los niveles normales. Desde la revolución
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GASES DE EFECTO INVERNADERO
•
Compra papel reciclado y recicla tu papel.
2010
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GASES DE EFECTO INVERNADERO
La Entropía o segunda ley de la Termodinámica dice:
2010
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GASES DE EFECTO INVERNADERO
El calentamiento global por co es un fraude: fraude:
2010
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GASES DE EFECTO INVERNADERO
2010
El registro adulterado del GICC pretende probar que las concentraciones de
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2010
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