![\"permafrost-erosion\"](\"https:\/\/www.madrimasd.org\/blogs\/universo\/wp-content\/blogs.dir\/42\/files\/147\/permafrost-erosion.jpg\")
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Erosi\u00f3n costera del permafrost y sedimentos marinos. Fuente: Im\u00e1genes Google<\/span><\/p>\n Cuando era joven y comenzaba mi andadura cient\u00edfica en el universo de los suelos, jam\u00e1s pens\u00e9 que el estudio los suelos helados (Gelisoles o Criosoles)<\/strong><\/span> terminara ocupando a tantos investigadores y menos a\u00fan que fueran motivo de miles de publicaciones. Se trata de suelos inf\u00e9rtiles que habitan en un mundo congelado<\/span><\/strong>, nunca mejor dicho. Se ha hablado hasta la saciedad de las terribles consecuencias del derretimiento el permafrost<\/strong><\/span>, empero estas capas heladas pueden afectar al suelo e incluso subyacen en las aguas marinas el litoral. Es decir, existen suelos con permafrost, pero no todos los permafrost son suelos<\/span><\/strong>. A menudo, las notas de prensa no disciernen entre ambos, o los fusionan en el mismo concepto, cuando hablamos de objetos naturales distintos, eso s\u00ed muy, pero que muy fresquitos. Este es un problema serio, ya que a veces no sabes a qu\u00e9 atenerte a la hora de extraer conclusiones, y menos a\u00fan redactar un post. M\u00e1s aun, ya sea porque el efecto del calentamiento clim\u00e1tico suele analizarse desde m\u00faltiples perspectivas, el derretimiento de estas capas heladas a dado lugar a publicaciones pol\u00e9micas, controversias y discusiones de sal\u00f3n. Incluso he llegado a leer<\/strong><\/span> (y la nota de prensa estaba bien redactada y razonada) que el tal deshielo de grandes extensiones cerca de los polos podr\u00eda llegar a favorecer el secuestro de carbono y no al contrario, como suele creerse<\/strong><\/span>. Los autores se basaban en que el deshielo generar\u00eda charcas con aguas estancadas, y estas a falta de ox\u00edgeno, seguir\u00edan capturando carbono de la atm\u00f3sfera, emiti\u00e9ndolo en menores cantidades, aportando a dem\u00e1s datos experimentales. Hoy haremos una excepci\u00f3n, ya que el estudio atesora algunas novedades y especialmente el estudio de la estratigraf\u00eda de los lechos de los fondos marinos en su relaci\u00f3n con el permafrost continental<\/strong><\/span> .. o no. Tambi\u00e9n llama la atenci\u00f3n su \u00e9nfasis en la gravedad de la erosi\u00f3n costera<\/strong><\/span>, que no el deshielo de los gelisuelos o Criosoles que se encuentran ubicados tierra a dentro. Eso si, las conclusiones, de ser corroboradas ser\u00edan muy alarmantes<\/strong><\/span>. Y todo ello, retrocediendo en su an\u00e1lisis hasta el tr\u00e1nsito entre el \u00faltimo periodo glaciar y el presente<\/strong><\/span>. No me voy a extender m\u00e1s\u2026\u2026. He traducido la noticia del suajili al espa\u00f1ol-castellano y creo que habla por s\u00ed sola. Eso s\u00ed, pensar que a\u00fan seguimos caminando sobre tierras pantanosas. Incluso lo que para algunos son obviedades y certezas, para otros expertos no. El tiempo dictar\u00e1 sentencia\u2026.<\/p>\n Juan Jos\u00e9 Ib\u00e1\u00f1ez<\/strong><\/span><\/p>\n Contin\u00faa\u2026\u2026\u2026.<\/em><\/span><\/p>\n <\/strong><\/p>\n Geograf\u00eda del Permafrost y Criosoles. Un Mundo de Suelos …<\/a><\/strong><\/p>\n Concepto de Permafrost y Suelos Helados. \u00bfCual es la …<\/a><\/strong><\/p>\n Criosoles, WRB (suelos Minerales Condicionados por el …<\/a><\/strong><\/p>\n Cartograf\u00eda y Monitorizaci\u00f3n de el Permafrost y Criosoles en …<\/a><\/strong><\/p>\n Deshielo del Permafrost Cambio Clim\u00e1tico, Arqueolog\u00eda e …<\/a><\/strong><\/p>\n Suelos, Cambio Clim\u00e1tico y Permafrost..<\/a><\/strong><\/p>\n El Deshielo del Permafrost y su Monitorizaci\u00f3n: Criosoles …<\/a><\/strong><\/p>\n Criosoles, permafrost y balance de energ\u00eda entre los suelos …<\/a><\/strong><\/p>\n Criosoles: Geograf\u00eda Ambiente y Paisaje<\/a><\/strong><\/p>\n Criosoles: Uso, Manejo y Cambio Clim\u00e1tico<\/a><\/strong><\/p>\n Erosi\u00f3n Costera, Litoral \u00c1rtico, Criosoles y Cambio Clim\u00e1tico.<\/a><\/strong><\/p>\n Suelos Helados y Crioturbaci\u00f3n: Criosoles o Gelisoles<\/a><\/strong><\/p>\n EL Secuestro de Carbono en los Suelos \u00c1rticos. Una Bomba<\/a><\/strong><\/p>\n Epidemias Bajo el Suelo \u00bfAmenaza para la Humanidad?<\/a><\/strong><\/p>\n La Taiga<\/a><\/strong><\/p>\n Criosoles en Europa y la Ant\u00e1rtida…<\/a><\/strong><\/p>\n Sea floor sediments of the Arctic Ocean can help scientists understand how permafrost responds to climate warming. A multidisciplinary team from Stockholm University has found evidence of past permafrost thawing during climate warming events at the end of the last ice age. Their findings, published in Science Advances, caution about what could happen in the near future: That Arctic warming by only a few degrees Celsius may trigger massive permafrost thawing, coastal erosion, and the release of the greenhouse gases carbon dioxide (CO2) and methane (CH4) into the atmosphere.<\/p>\n Arctic permafrost stores more carbon than the atmosphere does. When permafrost thaws, this carbon may be converted to greenhouse gases (CO2 and CH4) that then enter the atmosphere and may affect the climate system. To improve predictions of future greenhouse gas emissions from permafrost, scientists have started to look into the past, exploring how previous climate warming, for example at the end of the last ice age, affected permafrost and its vast pool of carbon.<\/p>\n \u00abOur new study shows for the first time the full history of how warming at the end of the last ice age triggered permafrost thawing in Siberia. This also suggests the release of large quantities of greenhouse gases,\u00bb says Jannik Martens, PhD student at Stockholm University and lead author of the study.<\/p>\n \u00abIt appears likely that past permafrost thawing at times of climate warming, about 14,700 and 11,700 years ago, was in part also related to the increase in CO2 concentrations that is seen in Antarctic ice cores for these times. It seems that Arctic warming by only a few degrees Celsius is sufficient to disturb large areas covered by permafrost and potentially affect the climate system.\u00bb<\/p>\n In the current study, the scientists used an eight meters long sediment core that was recovered from the sea floor more than 1 000 meters below the surface of the Arctic Ocean during the SWERUS-C3 expedition onboard the Swedish icebreaker Oden back in 2014. To reconstruct permafrost thawing on land, the scientists applied radiocarbon (14C) dating and molecular analysis to trace organic remains that once were released by thawing permafrost and then washed into the Arctic Ocean.<\/p>\n \u00abFrom this core we also learned that erosion of permafrost coastlines was an important driving force for permafrost destruction at the end of the last ice age. Coastal erosion continues to the present day, though ten times slower than during these earlier rapid warming period. With the recent warming trends, however, we see again an acceleration of coastal erosion in some parts of the Arctic, which is expected to release greenhouse gases by degradation of the released organic matter,\u00bb says Orjan Gustafsson, Professor at Stockholm University and leader of the research program.<\/p>\n \u00abAny release from thawing permafrost mean that there is even less room for anthropogenic greenhouse gas release in the earth-climate system budget before dangerous thresholds are reached. The only way to limit permafrost-related greenhouse gas releases is to mitigate climate warming by lowering anthropogenic greenhouse gas emissions.\u00bb<\/p>\n Gustafsson, Martens and their colleagues are now again in the Arctic Ocean as part of the International Siberian Shelf Study (ISSS-2020) onboard the Russian research vessel Akademik Keldysh. The expedition left the port of Arkhangelsk on September 26 and is currently in the East Siberian Sea, seeking more answers to how changing climate may trigger release of carbon, including greenhouse gases, from Arctic permafrost systems, including coastal erosion and permafrost below the sea bottom preserved from the past ice age.<\/p>\nAlgunos post previos sobre permafrost criosoles y Gelisoles<\/strong><\/span><\/h2>\n
Arctic Ocean sediments reveal permafrost thawing during past climate warming<\/a>
\n<\/strong>by Staff Writers; Stockholm, Sweden (SPX) Oct 19, 2020<\/h2>\n