Antártida

‘We must do a far better job of environmental stewardship – including paying for the scientific research so urgently needed.’ Photograph: Adam Fulton/Australian Antarctic Division/AFP/Getty Images

ReflexionesNuevas Tecnologías, ,

After decades immersed in Antarctic science, I’ve learned that physical and biological changes rarely occur smoothly. More often than not, they unfold in sharp steps. Right now, Antarctica’s climate and ecosystems are experiencing disturbing changes.

Much of this winter’s sea ice is missing. A crucial ocean current is slowing down, and glaciers and ice shelves are disintegrating.

On land, fragile moss ecosystems are collapsing. Majestic emperor penguins may be heading for extinction. And pollution from human activity in Antarctica has left a toxic legacy.

It’s almost certain things will get worse. On Friday, hundreds of international scientists called for an urgent expansion – not contraction – of Southern Ocean science in response to the emerging climate crisis.…  Seguir leyendo »

‘There is now 2.5m sq km less sea ice than there should be at this time of year, roughly the size of Western Australia,’ says oceanographer Andrew Meijers of Antarctica this southern winter. Photograph: Anadolu Agency/Getty Images

ReflexionesNaturaleza, ,

These last few months have been a turbulent time to be an oceanographer, particularly one specialising in the vast Southern Ocean around Antarctica and its role in our climate. The media has been awash with stories of marine heatwaves across the northern hemisphere, the potential collapse of the Atlantic meridional overturning circulation by mid-century and the record-breaking deficit in Antarctic sea ice emerging this southern winter. Alongside heatwaves and bushfires in North America and southern Europe, flooding in China and South American winter temperatures above 38C, the climate has moved from a “future problem” to a “now problem” in the minds of many.…  Seguir leyendo »

Last year an alarming, widespread heatwave hit large areas of Antarctica, causing, at some locations, a 35-40C temperature rise above long-term averages. Photograph: Terrance Klassen/Alamy

ReflexionesNaturaleza, ,

Antarctica is currently experiencing dramatic changes at unprecedented rates, marked by repeated extreme events. These include circum-Antarctic summer heatwaves and an autumn heatwave last year, with temperatures soaring up to 40C above the average. Moreover, both last summer and this winter, sea ice extent has reached record lows. These changes have happened even faster than scientists predicted.

These changes coincide with a broader global pattern of extreme air and sea surface temperatures, wildfires, floods, disease and other events deeply impacting ecosystems and society. Scientists have warned society about global climate change and its impacts since the Intergovernmental Panel on Climate Change’s first report in the early 1990s.…  Seguir leyendo »

La popa del 'Endurance' en el fondo del mar de Weddell, en la Antártida.Falklands Maritime Heritage Trust and National Geographic Caption/EFE

ReflexionesPensamiento, Cultura y Ciencia, ,

La historia de la exploración polar es una historia de resistencia y supervivencia: de todos cuantos se lanzaron para reconocer sus sobrecogedores paisajes y del propio planeta, cuyo calentamiento acusan estas regiones de manera dramática. Quizás el deshielo haya contribuido a encontrar el Endurance, el barco de Shackleton que quedó atrapado por la banquisa en 1915. Estaba hundido a 3.000 metros de profundidad en el mar de Weddell, junto a la Antártida, cerca de donde fue engullido por el mar helado. La extrema frialdad y salinidad de esas aguas han permitido que se conservara prácticamente intacto, pues allí abajo no sobreviven ni los microorganismos que devoran la madera de los pecios.…  Seguir leyendo »

Antártida, un paso adelante

ReflexionesNaturaleza

La Antártida constituye uno de los territorios mejor conservados del planeta. Esta enorme extensión de hielo juega un papel primordial como regulador del clima a nivel global, rodeada por un océano de aguas profundas y frías que alberga una variada y abundante biodiversidad marina.

Que la Antártida se haya conservado así no es una casualidad. Esto ha sido posible gracias a que, en los años noventa, un grupo de visionarios fueron capaces de dar un giro de timón para conseguir que este continente fuera designado como una reserva natural consagrada a la paz y la ciencia, tomando la protección del medioambiente como pilar esencial para la planificación y la realización de todas las actividades humanas.…  Seguir leyendo »

Credit Liu Shiping/Xinhua, via Getty Images

MundoAsiaReflexionesNaturaleza, , , ,

Even as the United States and China confront deep disagreements, there is a global challenge that simply won’t wait for the resolution of our differences: climate change.

While some have decided that we are entering a new Cold War with China, we can still cooperate on critical mutual interests. After all, even at the height of 20th-century tensions, the Americans and the Soviets negotiated arms control agreements, which were in the interests of both countries.

Climate change, like nuclear proliferation, is a challenge of our own making — and one to which we hold the solution. We have an opportunity this month to make clear that great power rivalries aside, geopolitics must end at the water’s edge — at the icy bottom of our planet in the Southern Ocean, which surrounds the entire continent of Antarctica.…  Seguir leyendo »

EspañaCultura y Ciencia

La Antártida ha sido el último de los continentes en ser descubierto y colonizado por los humanos. Es, por un lado, el más frío, ventoso e inhóspito que existe y, por otro, el más inaccesible desde los centros de expansión de las civilizaciones europeas.

Por el trasiego marítimo derivado de la amplitud de los dominios geográficos españoles en la historia, con mucha probabilidad fueron nuestros navegantes quienes lo avistaron por primera vez, cuando en 1603 el navío Buena Nueva, al mando de Gabriel de Castilla, se adentró hasta muy al sur a través del mar de Hoces o Paso de Drake.…  Seguir leyendo »

Borge Ousland, 33, of Norway at the South Pole in 1996. Credit Ketil Soyland/Associated Press

ReflexionesSocial, ,

Last week, after a marathon closing dash of 77.5 miles during 32 sleepless hours, the American Colin O’Brady stormed to the finish line at the foot of the Leverett Glacier to claim the first solo, unsupported traverse of Antarctica — a challenge Mr. O’Brady had called The Impossible First. Two days later, culminating a rivalry that commentators likened to the race between Robert Falcon Scott and Roald Amundsen to reach the South Pole in 1911-12, Louis Rudd of Britain finished the same arduous journey of more than 920 miles across the frozen continent, surviving brutal winds, whiteouts, crevasse scares and temperatures below minus 40 degrees Fahrenheit.…  Seguir leyendo »

Un pingüino adelaida, una de dos especies de pingüinos que viven en la Antártida, en el este del continente Credit Pauline Askin/Reuters

ReflexionesNuevas Tecnologías, ,  

El océano austral de Antártida ha sido explotado por su abundancia, en todos los niveles de la cadena alimenticia, durante más de doscientos años. Los cazadores de focas llegaron a finales del siglo XVIII y para 1825 el lobo fino estaba cerca de la extinción. Los cazadores entonces se enfocaron en otras especies de foca y en los pingüinos para extraer los aceites de su cuerpo. La caza de ballenas comenzó a principios del siglo XX y la presión ejercida por la caza alejó a algunas especies de las aguas antárticas.

Incluso son recogidas cientos de miles de toneladas anuales de kril, aquellas criaturas parecidas al camarón que son una fuente de alimento clave para ballenas, pingüinos, focas y aves marinas.…  Seguir leyendo »

An Adelie penguin in East Antarctica. Credit Pauline Askin/Reuters

ReflexionesNaturaleza, ,  

Antarctica’s Southern Ocean has been exploited for its teeming bounty, from the top of its food chain to the bottom, for more than 200 years. Seal hunters arrived there in the late 1700s and by 1825 fur seals were nearing extinction. Hunters then turned to other seal species, and to penguins, to extract oil from their body fat. Whaling arrived at the turn of the 20th century, with the hunting pressure driving some species from Antarctic waters.

Even krill, the tiny shrimplike creatures that are a key source of food to whales, penguins, seals and seabirds, are being scooped up in hundreds of thousands of tons per year.…  Seguir leyendo »

ReflexionesNaturaleza, ,

Las observaciones por satélite realizadas recientemente han confirmado la precisión de dos simulaciones por ordenador independientes que muestran que la capa de hielo de la Antártida occidental ha entrado en una etapa de colapso irrevocable. El planeta ha comenzado una nueva era de irreversibles consecuencias del cambio climático. La única pregunta que nos queda por hacer es si podremos hacer lo suficiente para evitar que vuelva a ocurrir en otros lugares.

Los últimos estudios revelan que hay zonas cruciales del sistema climático del mundo que, a pesar de su gran tamaño, son tan frágiles que la actividad humana puede perturbarlas irremediablemente.…  Seguir leyendo »

ReflexionesNaturaleza

It was far better to ski toward the South Pole than to reach it.

When I started out my journey in November 1992, everything was white all the way out to the horizon. As the weeks passed, I began to see more colors: variations of white, a bit of blue, green and yellow. By the time the strange-looking buildings of the Amundsen-Scott base appeared on the horizon 50 days later, I felt relief but also disappointment, and thought about skiing past it, back into the white nothingness.

The South Pole was considered the last place on earth when a fellow Norwegian, Roald Amundsen, arrived with four companions, a few dozen dogs and four sledges 100 years ago today.…  Seguir leyendo »

ReflexionesNaturaleza, ,

A desolate island in a frozen sea brings the world’s nations together with a new type of agreement: one giving an international commission the right to govern a landmass through unanimous vote. The year was 1912; the subject was the island of Spitsbergen in the Arctic Ocean. Thereafter, it and the surrounding archipelago were to belong to no nation, its natural resources open to all.

That agreement was no doubt on the minds of the drafters of the Antarctic Treaty, which was signed to much fanfare 50 years ago Tuesday by 12 nations: Argentina, Australia, Belgium, Britain, Chile, France, Japan, New Zealand, Norway, South Africa, the Soviet Union and the United States.…  Seguir leyendo »

MundoAméricaReflexionesNaturaleza,

Sitting on my desk is an illegal acquisition, a black pebble the size of a walnut. I picked it up some years ago on the slopes of Cape Crozier on Ross Island in the Antarctic. This vast wilderness of rock and ice lies on a cliff overlooking the Ross Sea and is celebrated as destination of the "worst journey in the world".

This was the title of the book written by Apsley Cherry-Garrard about a trip taken by him and two colleagues from Scott's 1911 polar expedition to acquire the eggs of the Emperor penguin. The storm shelter of stones, canvas and bits of sledge from which they barely escaped alive still lies on the cape, literally frozen in time.…  Seguir leyendo »

EuropaUnión Europea,

By Simon Jenkins (THE GUARDIAN, 28/04/06):

There is nowhere on earth more British than 77° south 166° east. On the shores of Ross Island in Antarctica stand three wooden huts intact from one of the classic episodes of British history, the race to the south pole between Scott and Shackleton. Two of the huts, Shackleton's at Cape Royds (1908) and Scott's at Cape Evans (1911), are still full of their icebound supplies left in case of either's return.

Both men, the moody, dedicated Scott and the charismatic Shackleton, endured intense privation on their way to their respective failures. Scott was beaten to the pole by the Norwegian Amundsen and Shackleton failed to make his second, transantarctic crossing.…  Seguir leyendo »