Diferencies ente revisiones de «Cambéu climáticu»

El '''cambéu climáticu''' ye un cambéu na distribución estadística de los patrones meteorolóxicos mientres un periodu enllargáu de [[Tiempu atmosféricu|tiempu]] (décades a millones d'años). Puede referise a un cambéu en #condicionar promediu del tiempu o na variación temporal meteorolóxica de #condicionar promediu al llargu plazu (por casu, más o menos fenómenos meteorolóxicos estremos). Ta causáu por factores como procesos bióticos, variaciones na radiación solar recibida pola Tierra, [[tectónicateutónica de plaques]] y erupciones volcániques. Tamién s'identificaron ciertes actividaes humanes como causa principal del cambéu climáticu recién, de cutiu llamáu ''[[calentamientu global]]''.<ref>America's Climate Choices: Panel on Advancing the Science of Climate Change; National Research Council (2010). [http://www.nap.edu/catalog.php?record_id=12782 ''Advancing the Science of Climate Change'']. Washington, D.C.: The National Academies Press. <small>[//es.wikipedia.org/wiki/ISBN ISBN]&nbsp;[//es.wikipedia.org/wiki/Especial:FuentesDeLibros/0-309-14588-0 0-309-14588-0]</small>. «(p1) ... there is a strong, credible body of evidence, based on multiple lines of research, documenting that climate is changing and that these changes are in large part caused by human activities. While much remains to be learned, the core phenomenon, scientific questions, and hypotheses have been examined thoroughly and have stood firm in the face of serious scientific debate and careful evaluation of alternative explanations. * * * (pp. 21-22) Some scientific conclusions or theories have been so thoroughly examined and tested, and supported by so many independent observations and results, that their likelihood of subsequently being found to be wrong is vanishingly small. Such conclusions and theories are then regarded as settled facts. This is the case for the conclusions that the Earth system is warming and that much of this warming is very likely due to human activities.»{{cita llibru |editorial=The National Academies Press|isbn=0-309-14588-0 |apellíu=America's Climate Choices: Panel on Advancing the Science of Climate Change; National Research Council |títulu=Advancing the Science of Climate Change|ubicación=Washington, D.C.|año=2010|url=http://www.nap.edu/catalog.php?record_id=12782|cita=(p1) ... there is a strong, credible body of evidence, based on multiple lines of research, documenting that climate is changing and that these changes are in large part caused by human activities. While much remains to be learned, the core phenomenon, scientific questions, and hypotheses have been examined thoroughly and have stood firm in the face of serious scientific debate and careful evaluation of alternative explanations. * * * (pp. 21-22) Some scientific conclusions or theories have been so thoroughly examined and tested, and supported by so many independent observations and results, that their likelihood of subsequently being found to be wrong is vanishingly small. Such conclusions and theories are then regarded as settled facts. This is the case for the conclusions that the Earth system is warming and that much of this warming is very likely due to human activities.}}</ref>

La Tierra sufrió munchos cambeos dende'l so orixe fai 4600 millones d'años. Fai 225 millones d'años tolos [[Continente|continentes]] taben xuníos, formando lo que se conoz como [[Panxea|Pangea]], y había un océanu universal llamáu Panthalassa. La [[tectónicateutónica de plaques]] dixebró los continentes y #poner na situación actual. L'Océanu Atlánticu foise formando dende fai 200 millones d'años.

Un procesu que demuestra fehacientemente la influencia al llargu plazu de #derivar de los continentes (o otramiente, la tectónicateutónica de plaques) sobre'l clima ye la esistencia de xacimientos de carbón nes islles Svaldbard o Spitbergen, nuna llatitú onde agora nun esisten árboles pol clima demasiáu fríu: la idea qu'esplica estos xacimientos ye que'l movimientu de la placa onde s'atopen diches islles #producir escontra'l norte dende un allugamientu más meridional con un clima más templáu.{{VT|Deriva continental y clima|deriva continental}}

A una escala bien de más lenta, el ion carbonatu disueltu nel océanu acaba bastiando, acomuñáu con un catión de [[calciu]], formando piedra caliar. Esta piedra caliar acaba incorporándose a la corteza terrestre, y al cabu del tiempu torna a l'atmósfera poles emisiones volcániques, en forma de CO2 una vegada más, dientro del ciclu xeoquímicu del carbonatu-silicatu. Otra posibilidá ye que remaneza a la superficie terrestre por procesos tectónicosteutónicos.