Tag Archives: Antarctica

Antarctic ice loss rates have tripled since 2012

A new study has found that Antarctic ice loss and sea level rise rates have tripled since 2012.

This assessment involves 84 scientists from more than 40 institutions, and combines data from 24 satellite surveys. It follows in the footsteps of the first IMBIE (Ice Sheet Mass Balance Inter-comparison Exercise) conducted in 2012, and paints a particularly grim picture of the years between then and 2017. Continue reading Antarctic ice loss rates have tripled since 2012

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1. Antarctic ice melt may have tipped

David Spratt at Climate Code Red has a post surveying recent studies on Antarctic ice sheet melting. I’ll cut to the chase with his update of a recent report from NOAA:

    a revised worst-case sea-level rise scenario of 2.5 metres by 2100, 5.5 metres by 2150 and 9.7 metres by 2200. It says sea level science has “advanced significantly over the last few years, especially (for) land-based ice sheets in Greenland and Antarctica under global warming”, and hence the “correspondingly larger range of possible 21st century rise in sea level than previously thought”.

Continue reading Climate clippings 204

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1. State of the Environment 2016

The government has produced the latest State of the Environment Report 2016 which happens every five years. I’ve browsed the report and can say that it has some magnificent photographs.

According to the ABS Australia’s population will be between 36.8 million and 48.3 million in 2066 as against 24 million now. The report says that the key drivers of environmental change are population growth and economic activity.

The report says that it is possible to decouple these drivers from environmental harm, but it’s a possibility only. Sue Arnold, following Ted Trainer and Sustainable Australia suggests that we have already breached our carrying capacity. Continue reading Climate clippings 202

Ice sheet decay spells danger from sea level rise

think-progress_0-byvq9xmd8g3r6qzl_230In the post Scoping long-term sea level rise I indicated the possibility of 25 metres (±5) of SLR with emissions of 380 (360-400)ppm and a temperature variance of 2.7 to 3.7°C. The question was really how long it would take, and what were the prospects for the next century or three.

The received wisdom seemed to be that we could expect about a metre, by 2100, and some studies limited SLR to about two metres in the next millennium. A new study suggests we could get close to two meters in total by 2100. Moreover the melting of ice on Antarctica alone could cause seas to rise more than 15 meters by 2500. Continue reading Ice sheet decay spells danger from sea level rise

Hansen worries that all hell will break loose

Hansen-paper-370x232_250James Hansen worries that “we may be approaching a point of no return, a situation in which our children inherit a climate system undergoing changes that are out of their control, changes that will cause them irreparable harm”. He’s looked at the models, at current observations, and at what happened during the Eemian interglacial 118,000 years ago, and he doesn’t like what he sees.

During the Eemian, when global average temperatures were about 1°C more than now, sea level was about 3-4 metres higher than now for a considerable time. Then about 118,000 years ago, towards the end of the interglacial, it peaked at 6-9 meters, including a rise of 2-3 metres within several decades. A similar sea level rise of several metres now would see the inundation of many of the world’s major cities.

Also there were huge storms at mid-latitudes in the North Atlantic which would make Superstorm Sandy look mild. Hansen thinks that climate change may be entering a phase where similar events could occur this century. Continue reading Hansen worries that all hell will break loose

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1. Tesla 3 sales going gangbusters

    Demand for Tesla Motors’ new lower-priced electric car surprised even the company’s CEO Friday as 198,000 people plunked down $US1,000 ($1302) deposits to reserve their vehicles.

    The orders came from across the globe even though the car isn’t scheduled for sale until late in 2017.

Continue reading Climate clippings 168

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1. Game changing steel to make lighter cars etc.

From Gizmag, courtesy of John D:

    Back in 2011, we wrote about a fascinating new way to heat-treat regular, cheap steel to endow it with an almost miraculous blend of characteristics. Radically cheaper, quicker and less energy-intensive to produce, Flash Bainite is stronger than titanium by weight, and ductile enough to be pressed into shape while cold without thinning or cracking. It’s now being tested by three of the world’s five largest car manufacturers, Continue reading Climate clippings 160

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1. Climate change affects the brain

    In a landmark public health finding, a new study from the Harvard School of Public Health finds that carbon dioxide (CO2) has a direct and negative impact on human cognition and decision-making. These impacts have been observed at CO2 levels that most Americans — and their children — are routinely exposed to today inside classrooms, offices, homes, planes, and cars.

Continue reading Climate clippings 155

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1. Will Hillary Clinton be too weak on climate change?

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Campaign chair John Podesta tweeted:

Helping working families succeed, building small businesses, tackling climate change & clean energy. Top of the agenda.

Yet she herself has mentioned it only obliquely since announcing that she’s running. From the past we have this:

At the National Clean Energy Summit in September of last year, in her first major domestic policy address since stepping down from the state department, Clinton described global warming as “the most consequential, urgent, sweeping collection of challenges we face as a nation and a world”. Continue reading Climate clippings 136

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1. Accelerating ice loss from Antarctica shelves

Some ice shelves in Antarctica are thickening and some are thinning. The pattern between east and west is obvious from this image:

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When we sum up losses around Antarctica, we find that the change in volume of all the ice shelves was almost zero in the first decade of our record (1994-2003) but, on average, over 300 cubic kilometers per year were lost between 2003 and 2012.

According to the ABC story, some shelves lost almost 20% of their thickness.

Melting ice shelves does not itself cause sea level rise, but the shelves buttress land ice, which then becomes more mobile. The graph in the bottom corner of the image shows that East Antarctica is now also experiencing a net loss of ice from ice shelves.

2. Top polluters to set own limits virtually penalty free

ANU economist Frank Jotzo said the system is designed so no-one gets caught by it – a toothless tiger. Tony Wood of the Grattan Institute said the ideas proposed in the paper simply would not work. They were commenting on a Government consultation paper outlining “safeguards” to ensure the big polluters do not offset emissions saved through the Emission Reduction Fund (ERF), a flagship component of Direct Action.

Australia’s 140 top polluters will set their own limits for future pollution virtually penalty free, according to the Government’s latest Direct Action policy paper.

Companies subject to the safeguards will select a baseline, or limit, for future pollution.

That baseline will be set according to the highest peak of emissions from the past five years.

Just plain stoopid!

3. What’s going on in the North Atlantic?

Stefan Rahmstorf asks the question at RealClimate. There is a large patch in the North Atlantic which has cooled in the last century.

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Rahmstorf explains:

Our recent study (Rahmstorf et al. 2015) attributes this to a weakening of the Gulf Stream System, which is apparently unique in the last thousand years.

In fact during last winter, which was the warmest on record for the planet overall, this patch had the coldest temperatures on record.

Chief suspect has to be the increasing freshwater coming off Greenland. There will be consequences.

The consequences of a large reduction in ocean overturning would look nothing like the Hollywood film The Day After Tomorrow. But they would not be harmless either – e.g. for sea level (Levermann et al. 2005) particularly along the US east coast (Yin et al. 2009), marine ecosystems, fisheries and possibly even storminess in Europe (Woollings et al. 2012).

A complete breakdown of the current was given up to a 10% chance this century in the IPCC report. This may have been an underestimate.

4. Rapid Arctic warming is changing the Jetstream and the weather

Another study, also involving Rahmstorf, looks at changing atmospheric circulation patterns due to Arctic warming.

The Arctic is warming faster than lower latitudes. The Jetstream velocity depends on temperature difference, hence it is slowing. It is also more wavy and has a tendency to get stuck, so heat or cold persists over a large area. Ironically, there is less storminess. Storms transport water onto land and break up persistent weather patterns.

The jet stream that circles Earth’s north pole travels west to east. But when the jet stream interacts with a Rossby wave, as shown here, the winds can wander far north and south.

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5. Brisbane EV charging technology takes on the world

Brisbane-based electric vehicle infrastructure company, Tritium, has done a deal to supply its award-winning Veefil DC fast charging stations to America’s ChargePoint company. ChargePoint has 21,000 EV chargers around the US.

The Australian-made stations will be installed on major routes across the country, including the express charging corridors on both the east and west coasts of the US that are being built as part of a recent deal between ChargePoint, Volkswagen and BMW.

The 50kW Veefil stations – which in the US will be called DC Fast stations and will be ChargePoint branded – are able to deliver up to 80 miles or 128 kilometers of charge in just 20 minutes, thus removing one of the key barriers to EV uptake: range anxiety.