Categoría: Cambio Climático RSS feed for this section

Existe más fitoplancton debajo de la capa de hielo ártica de lo que se pensaba

2. julio 2012

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Existe más fitoplancton debajo de la capa de hielo ártica de lo que se pensaba

Un nuevo estudio en el Mar de Chukski encontró un gran aumento de fitoplancton debajo de la capa de hielo oceánico del Ártico, sugiriendo que se ha subestimado drásticamente la productividad de las capas continentales primarias cubiertas por hielos marinos. More Phytoplankton Under Arctic Sea Ice than Previously Thought (26 June 2012) Arrigo, K.R., Perovich, D.K., Pickart, R.S., Brown, Z.W., van Dijken, G.L., Lowry, K.E., Mills, M.M., Palmer, M.A., Balch, W.M., Bahr, F., Bates, N.R., Benitez-Nelson, C., Bowler, B., Brownlee, E., Ehn, J.K., Frey, K.E., Garley, R., Laney, S.R., Lubelczyk, L.,[...] 

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Las olas de calor en climas extremos

1. julio 2012

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Las olas de calor en climas extremos

A pesar de que los estudios recientes basados en modelos sugieren que el calentamiento global causado por la actividad del hombre es la causa más probable de la ola de calor que azotó a Rusia en el 2010, éstos no explican de manera adecuada el mecanismo de muchas de las olas de calor de su historia pasada que no pudieron deberse al calentamiento global reciente debido a la actividad del hombre. Así, hasta el momento, cualquier relación entre las futuras olas de calos y el calentamiento global queda como materia cuestionable. Extreme Weather Heat Waves (26 June 2012) Otto, F.E.L., Massey,[...] 

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Variabilidad climática milenaria: ¡Esa es la norma!

30. junio 2012

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Variabilidad climática milenaria: ¡Esa es la norma!

Un informe especial en Deep-Sea Research II aporta con más datos a la gran cantidad de evidencias de una variación milenaria de cambios climáticos entre condiciones más cálidas y más frías. Millennial-Scale Climate Variability: It’s the Norm! (27 June 2012) Harada, N., Takahashi, K., Timmermann, A. and Sakamoto, T. 2012a. Climate change dynamics of present and past in the North Pacific and its northern marginal seas. Deep-Sea Research II 61-64: 1-3. Harada et al. (2012a), in their preface to a special issue of Deep-Sea Research II, briefly highlight what the issue has to say about “the[...] 

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La acidificación de las aguas marinas: ¿siempre disminuyen la calcificación?

29. junio 2012

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La acidificación de las aguas marinas: ¿siempre disminuyen la calcificación?

Los seis científicos que realizaron este estudio informaron que “en contra de las predicciones populares el depósito de carbonato de calcio puede mantenerse normal o aún aumentar en aguas marinas acidificadas”. De hecho, afirman que cuatro de las cinco especies que estudiaron mostraron mayores niveles de calcio en condiciones de bajo pH. Acidified Seawater: Does It Always Depress Calcification? (27 June 2012) Findlay, H.S., Wood, H.L., Kendall, M.A., Spicer, J.I., Twitchett, R.J. and Widdicombe, S. 2011. Comparing the impact of high CO2 on calcium carbonate structures in different marine[...] 

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La sensibilidad térmica de la Tierra a la duplicación de la concentración del CO2 atmosférico

28. junio 2012

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La sensibilidad térmica de la Tierra a la duplicación de la concentración del CO2 atmosférico

De acuerdo al IV Informe Evaluativo del IPCC el rango más probable de este parámetro de sensibilidad térmica, determinado por varios modelos climáticos, estría en el rango de 2 a 4.5°C. Sin embargo, este nivel de calentamiento puede ser demasiado amplio. Earth’s Thermal Sensitivity to a Doubling of Atmospheric CO2 (27 June 2012) Lindzen, R.S. and Choi, Y.-S. 2009. On the determination of climate feedbacks from ERBE data. Geophysical Research Letters 36: 10.1029/2009GL039628. What change in the mean surface air temperature of the planet would be caused by a doubling of the air’s CO2[...] 

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New Material Posted on the NIPCC Web site

14. junio 2012

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New Material Posted on the NIPCC Web site

Landfast Sea Ice Extent Along the East Antarctic Coast (12 June 2012) Evidence continues to accumulate for the continuing multi-decadal growth of both pack ice and fast ice across the entire East Antarctic region, which is something one would not expect to see in a world experiencing what climate alarmists describe as “unprecedented global warming”… Read More The Winds of Climate Change: Altering Albatross Life-History Traits (12 June 2012) What climate change over the Southern Ocean has significantly impacted the wandering albatross? … and has that change proven helpful[...] 

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New Material Posted on the NIPCC Web site

10. mayo 2012

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New Material Posted on the NIPCC Web site

The Medieval Warm Period in Southeast Uruguay … and Beyond (8 May 2012) The results of this paper add to the ever-expanding body of empirical findings testifying to the reality of the millennial-scale cycling of the planet’s climate, which after the passing of the Little Ice Age that followed the Medieval Warm Period is likely what has most recently ushered in the Current Warm Period… Read More Global Warming, Graminoid Grasses, and the Grazing Geese of Greenland (8 May 2012) How have rising temperatures impacted the grasses? … and how has the result impacted the geese? According[...] 

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UN Fails to Finalise Rio+20 Plan

8. mayo 2012

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UN Fails to Finalise Rio+20 Plan

After two weeks of closed door negotiations, a U.N. preparatory committee has failed to reach consensus on a global plan of action, titled “The Future We Want,” to be adopted by a summit meeting of world leaders mid-June in Brazil. In an effort to break the deadlock, the PrepCom will give another shot at the zero draft when it holds an unscheduled five-day session beginning May 29. This will be a last ditch attempt to finalise the draft action plan. –Thalif Deen, IPS News, 7 May 2012 Representatives from governments negotiating the outcome document for the United Nations Sustainable[...] 

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Twice as Many Emperor Penguins as Thought in Antarctica, First-Ever Penguin Count from Space Shows

15. abril 2012

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Twice as Many Emperor Penguins as Thought in Antarctica, First-Ever Penguin Count from Space Shows

A new study using satellite mapping technology reveals there are twice as many emperor penguins in Antarctica than previously thought. The results provide an important benchmark for monitoring the impact of environmental change on the population of this iconic bird, which breeds in remote areas that are very difficult to study because they often are inaccessible with temperatures as low as -58 degrees Fahrenheit. Recently reporting in the journal PLoS ONE, an international team of scientists describe how they used Very High Resolution satellite images to estimate the number of penguins at each[...] 

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Astronauts and scientists send letter to NASA: Stop global warming advocacy

11. abril 2012

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Astronauts and scientists send letter to NASA: Stop global warming advocacy

Joint letter from 49 former NASA scientists and astronauts to the current NASA Administrator blasts agency’s policy of ignoring empirical evidence about global warming. Joint letter to NASA Administrator blasts agency’s policy of ignoring empirical evidence HOUSTON, TX – April 10, 2012. 49 former NASA scientists and astronauts sent a letter to NASA Administrator Charles Bolden last week admonishing the agency for it’s role in advocating a high degree of certainty that man-made CO2 is a major cause of climate change while neglecting empirical evidence that calls the theory into question. The[...] 

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