Tag Archives: west

Antarctica: warming ocean trebles glacial melt Updated for 2026





The Antarctic ice shelf is under threat from a silent, invisible agency – and the rate of melting of glaciers has trebled in the last two decades.

The ocean waters of the deep circumpolar current that swirl around the continent have been getting measurably warmer and nearer the ocean surface over the last 40 years, and now they could be accelerating glacier flow by melting the ice from underneath, according to new research.

And a separate study reports that the melting of the West Antarctic glaciers has accelerated threefold in the last 21 years.

West Antarctic ice sheet – a potential 4.8m of sea level rise

If the West Antarctic ice sheet were to melt altogether – something that is not likely to happen this century – the world’s sea levels would rise by 4.8 metres, with calamitous consequences for seaboard cities and communities everywhere.

Researchers from Germany, Britain, Japan and the US report in Science journal that they base their research on long-term studies of seawater temperature and salinity sampled from the Antarctic continental shelf.

This continued intrusion of warmer waters has accelerated the melting of glaciers in West Antarctica, and there is no indication that the trend is likely to reverse.

Other parts of the continent so far are stable – but they could start melting for the first time. “The Antarctic ice sheet is a giant water reservoir”, said Karen Heywood, professor of environmental sciences at the University of East Anglia, UK.

“The ice cap on the southern continent is on average 2,100 metres thick and contains 70% of the world’s fresh water. If this ice mass were to melt completely, it could raise global sea level by 60 metres. That is not going to happen, but it gives you an idea of how much water is stored there.”

Temperatures in the warmest waters in the Bellinghausen Sea in West Antarctica have risen from 0.8°C in the 1970s to about 1.2°C in the last few years.

“This might not sound much, but it is a large amount of extra heat available to melt the ice, said Sunke Schmidtko, an oceanographer at the Geomar Helmholtz Centre for Ocean Researchin Kiel, Germany, who led the study. “These waters have warmed in West Antarctica over 50 years. And they are significantly shallower than 50 years ago.”

Unpredictable consequences on ice and ecology

The apparent rise of warm water, and the observed melting of the West Antarctic ice shelf, could be linked to long-term changes in wind patterns in the Southern Ocean. Although melting has not yet been observed in other parts of the continent, there could be serious consequences for other ice shelves.

The shelf areas are also important for Antarctic krill – the little shrimp that plays a vital role in the Antarctic ocean food chain – as they serve as protective ‘nurseries’ for the young crustaceans. Warming ice shelves may have unpredictable consequences for spawning cycles, krill abundance, and wider ocean biodiversity.

Meanwhile, according to US scientists writing in Geophysical Research Letters, the glaciers of the Amundsen Sea in West Antarctica are shedding ice faster than any other part of the region.

Tyler Sutterley, a climate researcher at the University of California Irvine, and NASA space agency colleagues used four sets of observations to confirm the threefold acceleration.

They took their data from NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites, from a NASA airborne project called Operation IceBridge, from an earlier satellite called ICESat, and from readings by the European Space Agency’s Envisat satellite.

Glaciers losing 16 billion tonnes of ice a year

The observations spanned the period 1992 to 2013 and enabled the researchers to calculate the total loss of ice, and also the rate of change of that loss. In all, during that period the continent lost 83 billion tonnes of ice per year on average.

After 1992, the rate of loss accelerated by 6.1 billion tonnes a year, and between 2003 and 2009 the melt rate increased by 16.3 gigatonnes a year on average. So the increasing rate of loss is now nearly three times the original figure.

“The mass loss of these glaciers is increasing at an amazing rate”, said Isabella Velicogna, Earth system scientist at both UC Irvine and the NASA Jet Propulsion Laboratory.

 


 

Tim Radford writes for Climate News Network.

 

 




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Oil palm explosion driving West Africa’s Ebola outbreak Updated for 2026





The growing Ebola virus outbreak not only highlights the tragedy enveloping the areas most affected but also offers a commentary on they way in which the political ecology in West Africa has allowed this disease to become established.

The narrative goes that the virus appeared spontaneously in the forest villages of Guinea in December 2013. But this is debatable given that there is evidence of antibodies the Ebola virus in human blood from Sierra Leone up to five years before.

Previously only one case of Ebola had been reported in the region, and it was the Ivory Coast strain of the virus. The strain detected in the blood samples is of the more virulent Zaire strain of Ebola, the same strain responsible for the current epidemic.

After months of very little concerted action it’s clear that the disease is now seriously in danger of spreading out of control.

The real drivers of Ebola in West Africa – poverty and oil palm

The global health community has declared it a crisis of international importance, which has led the host nations to implement draconian preventions strategies, tantamount in some places to martial law in terms of surveillance, quarantine, border controls and other logistical aspects of control. But this is too little, too late.

There are several mechanisms through which the virus may have emerged, and it is unlikely that this latest outbreak was spontaneous.

It is poverty that drives villagers to encroach further into the forest, where they become infected with the virus when hunting and butchering wildlife, or through contact with body fluids from bats – this has been seen with Nipah, another dangerous virus associated with bats.

The likelihood of infection in this manner is compounded by inadequate rural health facilities and poor village infrastructure, compounded by the disorganised urban sprawl at the fringes of cities.

The virus then spreads in a wave of fear and panic, ill-conceived intervention and logistical failures – including even insufficient food or beds for the severely ill.

Take for example the global palm oil industry, where a similar trend of deep-cutting into forests for agricultural development has breached natural barriers to the evolution and spread of specific pathogens.

The effects of land grabs and the focus on certain fruit crop species leads to an Allee effect, where sudden changes in one ecological element causes the mechanisms for keeping populations – bats in this case – and viruses in equilibrium to shift, increasing the probability of spill over to alternative hosts.

Palm oil’s relentless march at the expense of forests and health

This is not unheard of; the introduction of fruit tree crops in cleared forests and agricultural expansion in Malaysia was associated with the emergence of Nipah virus. Bats feeding on fruit trees infected pigs in pens, which provided a vector for the virus to humans.

Another example is with vector-borne diseases such as the Japanese Encephalitis, a virus carried by wild birds which expanded its range due to growing rice and pig farming.

Chikungunya and Dengue Fever viruses exploited deforestation for secondary epidemiological cycles, which increased at the forest edge until the virus was able to adapt to secondary hosts and expand globally.

Certainly the complexity of the agro-ecological changes in West Africa warrant scrutiny. Guinea’s new agriculture is in an early stage of development, identified by the World Bank as the highest investment potential for industrial agriculture.

As global markets shift – and tariffs and taxes on multinational companies are removed, farmers with small land holdings are faced with a choice: either sell off or scale up to meet the competition. Forests are one of the first casualties.

A breakdown of traditional governance

Alongside this subtle effect is the dismantling of traditional governance, violence under colonial, neo-colonial and more recent kleptocratic governments and the economic movements of people towards urbanisation.

Such turbulence, poverty, the influx of refugees from neighbouring wars and crumbling health systems have all created an ecosystem in which the natural friction that prevents Ebola from gathering pathogenic momentum has been all but eroded.

Any international response can do little to remedy these contributing factors. In fact the response has been little more than a recognition of the complete failure of neo-liberal development strategies to contain the virus.

The ‘success’ of the Ebola virus is fundamentally based on the sociological factors and population biology of those it infects. But the data required to test the hypothesis – detailed records about what people eat, where they go and how they interact – is presently unavailable.

Instead research has focused on virus hunting, and with little success: more than 40,000 samples have not yet conclusively determined where the natural reservoir of Ebola lies.

All the while, the socio-ecological factors that are critical to the spread of any disease are ignored.

 


 

The report:Did Ebola emerge in West Africa by a policy-driven phase change in agroecology?’ is published in Environment and Planning.

Richard Kock is Professor of Wildlife Health and Emerging Diseases at the Royal Veterinary College. He received funding from DFID to explore gaps and opportunities in the treatment or prevention of zoonoses in emerging livestock systems. Funding is current from EU through BBSRC on an emerging livestock viral disease in Africa – specifically PPR virus in wildlife populations.

This article was originally published on The Conversation. Read the original article.

 

 




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Oil palm explosion driving West Africa’s Ebola outbreak Updated for 2026





The growing Ebola virus outbreak not only highlights the tragedy enveloping the areas most affected but also offers a commentary on they way in which the political ecology in West Africa has allowed this disease to become established.

The narrative goes that the virus appeared spontaneously in the forest villages of Guinea in December 2013. But this is debatable given that there is evidence of antibodies the Ebola virus in human blood from Sierra Leone up to five years before.

Previously only one case of Ebola had been reported in the region, and it was the Ivory Coast strain of the virus. The strain detected in the blood samples is of the more virulent Zaire strain of Ebola, the same strain responsible for the current epidemic.

After months of very little concerted action it’s clear that the disease is now seriously in danger of spreading out of control.

The real drivers of Ebola in West Africa – poverty and oil palm

The global health community has declared it a crisis of international importance, which has led the host nations to implement draconian preventions strategies, tantamount in some places to martial law in terms of surveillance, quarantine, border controls and other logistical aspects of control. But this is too little, too late.

There are several mechanisms through which the virus may have emerged, and it is unlikely that this latest outbreak was spontaneous.

It is poverty that drives villagers to encroach further into the forest, where they become infected with the virus when hunting and butchering wildlife, or through contact with body fluids from bats – this has been seen with Nipah, another dangerous virus associated with bats.

The likelihood of infection in this manner is compounded by inadequate rural health facilities and poor village infrastructure, compounded by the disorganised urban sprawl at the fringes of cities.

The virus then spreads in a wave of fear and panic, ill-conceived intervention and logistical failures – including even insufficient food or beds for the severely ill.

Take for example the global palm oil industry, where a similar trend of deep-cutting into forests for agricultural development has breached natural barriers to the evolution and spread of specific pathogens.

The effects of land grabs and the focus on certain fruit crop species leads to an Allee effect, where sudden changes in one ecological element causes the mechanisms for keeping populations – bats in this case – and viruses in equilibrium to shift, increasing the probability of spill over to alternative hosts.

Palm oil’s relentless march at the expense of forests and health

This is not unheard of; the introduction of fruit tree crops in cleared forests and agricultural expansion in Malaysia was associated with the emergence of Nipah virus. Bats feeding on fruit trees infected pigs in pens, which provided a vector for the virus to humans.

Another example is with vector-borne diseases such as the Japanese Encephalitis, a virus carried by wild birds which expanded its range due to growing rice and pig farming.

Chikungunya and Dengue Fever viruses exploited deforestation for secondary epidemiological cycles, which increased at the forest edge until the virus was able to adapt to secondary hosts and expand globally.

Certainly the complexity of the agro-ecological changes in West Africa warrant scrutiny. Guinea’s new agriculture is in an early stage of development, identified by the World Bank as the highest investment potential for industrial agriculture.

As global markets shift – and tariffs and taxes on multinational companies are removed, farmers with small land holdings are faced with a choice: either sell off or scale up to meet the competition. Forests are one of the first casualties.

A breakdown of traditional governance

Alongside this subtle effect is the dismantling of traditional governance, violence under colonial, neo-colonial and more recent kleptocratic governments and the economic movements of people towards urbanisation.

Such turbulence, poverty, the influx of refugees from neighbouring wars and crumbling health systems have all created an ecosystem in which the natural friction that prevents Ebola from gathering pathogenic momentum has been all but eroded.

Any international response can do little to remedy these contributing factors. In fact the response has been little more than a recognition of the complete failure of neo-liberal development strategies to contain the virus.

The ‘success’ of the Ebola virus is fundamentally based on the sociological factors and population biology of those it infects. But the data required to test the hypothesis – detailed records about what people eat, where they go and how they interact – is presently unavailable.

Instead research has focused on virus hunting, and with little success: more than 40,000 samples have not yet conclusively determined where the natural reservoir of Ebola lies.

All the while, the socio-ecological factors that are critical to the spread of any disease are ignored.

 


 

The report:Did Ebola emerge in West Africa by a policy-driven phase change in agroecology?’ is published in Environment and Planning.

Richard Kock is Professor of Wildlife Health and Emerging Diseases at the Royal Veterinary College. He received funding from DFID to explore gaps and opportunities in the treatment or prevention of zoonoses in emerging livestock systems. Funding is current from EU through BBSRC on an emerging livestock viral disease in Africa – specifically PPR virus in wildlife populations.

This article was originally published on The Conversation. Read the original article.

 

 




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