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Extreme weather – derecho storm brings about early closure of Duane Arnold nuclear plant

Duane Arnold nuclear plant decommissioning early after damage from the derecho 


by Rebecca Kopelman, Tuesday, August 25th 2020   https://cbs2iowa.com/news/local/duane-arnold-nuclear-plant-

Iowa (Iowa’s News Now) — The Duane Arnold Energy Center is beginning their decommissioning process after the August 10th derecho.

The energy center is the only nuclear power plant in Iowa. It was set to be decommissioned at the end of October, but will be closing due to the damage.

This is a statement from NextEra Energy Resources:

“After conducting a complete assessment of the damage caused by recent severe weather, NextEra Energy Resources has made the decision not to restart the reactor at Duane Arnold Energy Center. The strong storms that hit the area on Aug. 10 caused extensive damage to Duane Arnold’s cooling towers, and our evaluation found that replacing those towers before the site’s previously-scheduled decommissioning on Oct. 30, 2020, was not feasible.

As we have done since we announced the decommissioning of Duane Arnold in 2018, we will continue to work with all our employees to minimize the impact of this situation on them and their families.”

The storms damaged the cooling towers which are used to produce electricity to cool steam after it exits the turbine.The cooling towers are not required to cool critical nuclear components. There was also damage to the outside of the building.  None of the damage impacted safety systems or critical components.

August 25, 2020 Posted by | climate change, USA | Leave a comment

Nearly 90% of young people want real action on climate change

Young people send strong climate message, Pro Bono  Maggie Coggan | 24 August  20,

“We see the world in a different light. Politicians need to start listening to us and taking action,” a youth leader says.

Nearly 90 per cent of young people say they feel unprepared for future climate disasters and want politicians to give them a bigger voice on climate change, a new report finds.

Conducted in the wake of the catastrophic summer bushfire season, the new Australian Institute for Disaster Resilience and World Vision Australia research found that despite hazards such as bushfires, floods, drought and tropical cyclones posing a greater threat, young people said they were more likely to learn about earthquakes at school.

This left 88 per cent of survey respondents feeling unprepared and unable to protect themselves and their communities, even though nearly two-thirds (64 per cent) had experienced at least three events such as bushfires, heatwaves and drought in the past three years.

“We anticipate that we will experience personal impacts from natural hazards in the future, whether we are living in capital cities, regional centres, or rural areas,” respondents said.

“The 2020 bushfires demonstrated that you need not live in the bush to be affected by a bushfire. We are experiencing these persistent worries while having to contend with life, school, growing up and everything else that comes with being a young person in Australia.”

It is the most comprehensive consultation of children and young people on climate change, disasters, and disaster-resilience in the country, with 1,500 people participating in the online survey, supported by UNICEF Australia, Plan International, Save the Children, Oaktree and Australian Red Cross.

Young people concerned, but not heard …………  A full copy of the report can be found here.    https://probonoaustralia.com.au/news/2020/08/young-people-send-strong-climate-message/

August 25, 2020 Posted by | climate change, World | Leave a comment

Ice melting at a surprisingly fast rate underneath Shirase Glacier Tongue in East Antarctica

East Antarctic melting hotspot identified
  https://www.sciencedaily.com/releases/2020/08/200824092000.htm
        August 24, 2020
Source:
Hokkaido University
Summary:
Ice is melting at a surprisingly fast rate underneath Shirase Glacier Tongue in East Antarctica due to the continuing influx of warm seawater into the Lützow-Holm Bay.

Hokkaido University scientists have identified an atypical hotspot of sub-glacier melting in East Antarctica. Their findings, published in the journal Nature Communications, could further understandings and predictions of sea level rise caused by mass loss of ice sheets from the southernmost continent.

The 58th Japanese Antarctic Research Expedition had a very rare opportunity to conduct ship-based observations near the tip of East Antarctic Shirase Glacier when large areas of heavy sea ice broke up, giving them access to the frozen Lützow-Holm Bay into which the glacier protrudes.

“Our data suggests that the ice directly beneath the Shirase Glacier Tongue is melting at a rate of 7-16 meters per year,” says Assistant Professor Daisuke Hirano of Hokkaido University’s Institute of Low Temperature Science. “This is equal to or perhaps even surpasses the melting rate underneath the Totten Ice Shelf, which was thought to be experiencing the highest melting rate in East Antarctica, at a rate of 10-11 meters per year.”

The Antarctic ice sheet, most of which is in East Antarctica, is Earth’s largest freshwater reservoir. If it all melts, it could lead to a 60-meter rise in global sea levels. Current predictions estimate global sea levels will rise one meter by 2100 and more than 15 meters by 2500. Thus, it is very important for scientists to have a clear understanding of how Antarctic continental ice is melting, and to more accurately predict sea level fluctuations.

Most studies of ocean-ice interaction have been conducted on the ice shelves in West Antarctica. Ice shelves in East Antarctica have received much less attention, because it has been thought that the water cavities underneath most of them are cold, protecting them from melting.

During the research expedition, Daisuke Hirano and collaborators collected data on water temperature, salinity and oxygen levels from 31 points in the area between January and February 2017. They combined this information with data on the area’s currents and wind, ice radar measurements, and computer modelling to understand ocean circulation underneath the Shirase Glacier Tongue at the glacier’s inland base.

The scientists’ data suggests the melting is occurring as a result of deep, warm water flowing inwards towards the base of the Shirase Glacier Tongue. The warm water moves along a deep underwater ocean trough and then flows upwards along the tongue’s base, warming and melting the ice. The warm waters carrying the melted ice then flow outwards, mixing with the glacial meltwater.

The team found this melting occurs year-round, but is affected by easterly, alongshore winds that vary seasonally. When the winds diminish in the summer, the influx of the deep warm water increases, speeding up the melting rate.

“We plan to incorporate this and future data into our computer models, which will help us develop more accurate predictions of sea level fluctuations and climate change,” says Daisuke Hirano.

August 25, 2020 Posted by | ANTARCTICA, climate change, Reference | Leave a comment

Gas is not transition energy we were promised, new research suggests

Gas is not transition energy we were promised, new research suggests, SMH, By Nick O’Malley, August 24, 2020 — The good news about natural gas is that when it is burnt it creates between 40 and 50 per cent less carbon dioxide than coal would to create the same amount of energy.This is why it has been embraced by some climate activists and governments as a useful energy source to replace coal and oil while renewable energy technologies catch up with global energy demand.

But the good news ends there, and there is a lot more to the story.

Before it is burnt natural gas is mostly made up of methane, and methane is estimated to be about 28 times more potent a greenhouse gas than carbon dioxide over a 100-year period.

Over a 20-year period – about the time scientists believe we have to try to prevent the worst impacts of global warming – it is up to 80 times more potent at warming the planet than carbon dioxide.

The United States’ Environmental Protection Agency estimates that for every cubic metre of methane extracted by the US oil and gas industry, 1.4 per cent escapes into the atmosphere as so-called fugitive emissions.

But more recent research suggests this estimate is drastically low, and that, in fact, the industry in the US is leaking 13 million metric tonnes of methane a year, or 2.3 per cent.

It is not yet clear how much fugitive methane is released by the Australian gas industry, but new technologies now allow scientists to accurately measure it and the data is expected to be published in the coming months.

The US Environmental Defence Fund estimated that, in America, if just 3 per cent of methane escapes, gas is no cleaner an energy source than coal……. https://www.smh.com.au/environment/climate-change/gas-is-not-transition-energy-we-were-promised-new-research-suggests-20200824-p55ovg.html

August 25, 2020 Posted by | 2 WORLD, climate change | Leave a comment

Scientists conduct first in situ radiation measurements 21 km in the air over Tibetan Plateau

Scientists conduct first in situ radiation measurements 21 km in the air over Tibetan Plateau  https://phys.org/news/2020-08-scientists-situ-km-air-tibetan.html  by Li Yuan, Chinese Academy of Sciences,  24 Aug, 20, Radiation variations over the Tibetan Plateau (TP) are crucial for global climate and regional ecological environment. Previous radiation studies over the TP were widely based on ground and satellite measurements of the radiation budget at the surface and at the top of the atmosphere.

In situ vertical radiation measurements from the surface up to the upper troposphere and lower stratosphere (UTLS), about 10 to 22 km in altitude, are rare over the TP or even over a large territory of China.

Dr. Zhang Jinqiang from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences (CAS), in collaboration with scientists from the Aerospace Information Research Institute of CAS, developed a balloon-based measurement system to measure stratospheric radiation

This original system, for the first time, provides in situ measurements of multiwavelength radiation profiles from the surface up to the UTLS over the TP. Using this system, scientists can study how and why radiation profiles vary over the TP during the Asian summer monsoon period.

The observation campaigns were conducted three times in the summer of 2018 and 2019, of which the longest flight observation lasted more than 30 hours and achieved a breakthrough of diurnal radiation variation in the UTLS.

According to the team, the stratospheric balloon-based radiation profiles, combined with simultaneous operational radiosondes, ground measurements, satellite retrievals and radiative transfer model simulations, are valuable because the data can be used to study radiation variations and the radiative forcings of clouds and aerosols over the TP during the Asian summer monsoon period. The radiation retrievals from the radiative transfer model simulations and satellite observations are also validated.

“The results of these campaigns can improve our understanding of radiation properties in the UTLS and help us better comprehend the thermal conditions associated with clouds and aerosols over the TP during the Asian summer monsoon period,” said Zhang.

Their findings were published in Environmental Research LettersJournal of Environmental Sciences and Atmospheric Pollution Research.

August 25, 2020 Posted by | climate change, India | Leave a comment

2020 Is Proving Another Disastrous Year For Our Earth’s Climate

August 24, 2020 Posted by | climate change, World | Leave a comment

Nuclear power is not compatible with the fundamental tenets of a Green New Deal.

Nuclear power in the Green New Deal?   https://beyondnuclearinternational.org/2020/08/23/nuclear-in-the-green-new-deal/  August 23, 2020 by beyondnuclearinternational     By M.V. Ramana and Schyler Edmunston

Over the last few years, there has been a growing interest in a Green New Deal and there are many versions proposed in different countries. At the same time, there has also been criticism of these proposals on many counts, including the fact that they typically don’t include nuclear energy.

This criticism misses a basic point: a Green New Deal is, by its very definition, much more than an emissions reduction plan. As we argue below, the other attributes that characterize Green New Deals, rule out nuclear energy as an option.

Like the original New Deal of U.S. president Franklin D. Roosevelt in the 1930s, all Green New Deal proposals emphasize the creation of new jobs. Canada’s New Democratic Party version, for example, calls for “a New Deal for Climate Action and Good Jobs.”

Nuclear power is not a good job creator. One widely cited study found that for each gigawatt-hour of electricity generated, solar energy leads to six times as many jobs as nuclear power. This is compounded by the fact that solar power plants are far cheaper to build and maintain than nuclear reactors.

Green New Deal proposals also demand rapid emissions reduction; one spokesperson for the Pact for a Green New Deal talked of “a 50 per cent reduction in greenhouse gas emissions by 2030.” It takes, on average, a decade to build a nuclear plant and another 10 years before that to do the necessary planning, license procurement, and, most importantly, obtain the billions of dollars needed to finance construction. Therefore, it is impossible to scale up nuclear power fast enough to reduce emissions at the rate required to meet tight climate targets.

Last but not least, Green New Deal proposals emphasize ethics and equity. The Pact for a Green New Deal, for example, wants to ensure that the necessary energy transition “is socially just and doesn’t hurt those at the bottom of the economic ladder; and that it respects Indigenous rights.” It is precisely those groups that have been hurt most by the nuclear fuel chain.

Around the world, the uranium that fuels nuclear plants has predominantly been mined from traditional lands of Indigenous peoples, whether we are talking about CanadaIndiathe United States, or Australia. There is ample evidence of devastating health consequences from the production of uranium, for example, on the Navajo and the Lakota nations.

The nuclear industry’s plans for the disposal of radioactive waste streams produced by nuclear reactors also disproportionately target areas with high proportions of Indigenous populations, and has rightly been termed nuclear colonialism.

Nuclear waste, by its nature, raises difficult challenges for any effort to base energy policy on justice. The hazardous components of these wastes stay radioactive for hundreds of thousands of years, and no method can ensure safety for that long a period of time. There is inherent injustice in forcing future generations to deal with these radioactive products spreading into underground sources of water, when they do not benefit from nuclear electricity in any way.

One set of technologies that is widely seen as being necessary to confront climate change are renewables, especially solar and wind power. Because they are dependent on the sun shining and the wind blowing, some suggest that nuclear energy has to be part of the mix in order to ensure that electricity is available when needed.

This is not true and research has shown that it is possible for even Ontario, the Canadian province most dependent on nuclear energy, to phase out nuclear power and reduce emissions, while meeting electricity needs reliably.

Further, existing nuclear facilities, do not have the necessary flexibility to integrate well with the rapidly variable outputs from wind and solar power. Therefore, they inhibit ambitious climate agendas — a realization that informed the decision in California to close the Diablo Canyon nuclear plant.

In short, nuclear power is not compatible with the fundamental tenets of a Green New Deal.

M.V. Ramana is professor, Simons Chair in Disarmament, Global and Human Security, and director of the Liu Institute for Global Issues at the School of Public Policy and Global Affairs, the University of British Columbia.

Schyler Edmundson is a recent graduate from the Master of Public Policy and Global Affairs program at the University of British Columbia.
This article first appeared in The Star (Toronto) as part of a pro-con debate on nuclear power’s inclusion in a Green New Deal. The “against” argument here is republished with kind permission of The Star op-ed page editor.

 

August 24, 2020 Posted by | climate change, politics, USA | Leave a comment

The climate crisis. Don’t blame the IPCC – at least they warned us

The Observer view on the climate catastrophe facing Earth,

Thirty years ago we were warned. Now is our last chance to listen,

The scientists had been charged by the IPCC, which had been set up two years earlier, with establishing whether climate change was a real prospect and, if it was, to look at the main drivers of that threat. They concluded, in a report released in August 1990, that the menace was real and that coal, gas and oil would be the principal causes of global heating. Unless controls were imposed on their consumption, temperature rises of 0.3C a decade would be occurring in the 21st century, bringing havoc in their wake.

Three decades later, it is clear that we have recklessly ignored that warning. Fossil fuels still supply 80% of the world’s energy, carbon dioxide levels in the atmosphere continue to rise and global temperatures are still increasing. According to Met Office statistics, there was a 0.14C increase in global temperatures in the decade that followed publication of the first assessment report. This was then followed by a 0.2C increase in each of the following two decades. The world could easily heat by 3C by the end of the century at this rate, warn scientists.

The impact on the world will, by then, be catastrophic. As the Observer reveals this week, our overheating planet has already lost a staggering 28tn tonnes of ice from its ice sheets and glaciers, triggering sea level rises that are now accelerating at a rate that matches the worst-case scenario predictions of the IPCC………..

we should be careful when apportioning blame for the world’s failure to act over climate change. It is the government members of the IPCC who are at fault for ignoring their own scientists’ warnings. They have allowed lobbying by the fossil fuel industry to play havoc with attempts to limit carbon emissions, while nations such as Canada, Saudi Arabia and the United States have blocked all attempts to limit global fossil fuel consumption.

By contrast, the IPCC has at least made the world aware of the impending crisis, a task of considerable complexity. Getting scientific experts from 195 nations to agree anything can be likened to the herding of a similar number of bad-tempered cats.

Thanks to the IPCC, we are at least aware of the problem that now faces our world. We know exactly how much fossil fuel we have left to burn if we want to limit global temperature rises to a relatively safe rise of 1.5C. Individual nations have until next year – at the United Nations climate change conference in November – to announce how they will achieve those reductions in oil, gas and coal burning in order to make that target possible and to halt global heating. It is an achievable aspiration even at this late date. We still have hope, in other words………

https://www.theguardian.com/commentisfree/2020/aug/23/the-observer-view-on-the-climate-catastrophe-facing-earth

August 24, 2020 Posted by | 2 WORLD, climate change | Leave a comment

Staggering loss of ice from Greenland

Independent 22nd Aug 2020, High temperatures saw Greenland lose enough ice to cover the US state of
California in more than four feet of water in 2019 alone, a study which  suggests the island lost a million tonnes of ice for every minute of the  year has said.

After two years in which the land masses’ summer ice melt had been negligible, satellite measurements have suggested an excessively hot 2019 saw the loss of 586 billion tons of ice melt from the island. The loss represents more than 532 trillion litres of water according to a study published in Communications Earth & Environment – equivalent to 212.8 million olympic-sized swimming pools over the course of 2019, or seven for every second of the year.

https://www.independent.co.uk/environment/greenland-ice-melt-glacier-global-warming-climate-change-nasa-alfred-wegener-institute-a9683866.html

August 24, 2020 Posted by | ARCTIC, climate change | Leave a comment

Heat from the ocean’s interior contributes to loss of Arctic sea ice

August 24, 2020 Posted by | ARCTIC, climate change | Leave a comment

Experts are calling for international collaboration to combat wildfires

Independent 22nd Aug 2020, Experts are calling for international collaboration to combat wildfires,
which they say are an under-acknowledged component of the climate crisis.
Extreme fire conditions in Siberia this summer, ongoing and devastating
blazes across California and the worst start to the Amazon fire season in a
decade are sparking concern from across the scientific community.

“People globally should start to perceive wild land fires as part of the global
climate crisis, and then, try to find where the solutions require global
participation” says Anton Beneslavsky, from Greenpeace International.

https://www.independent.co.uk/environment/california-wildfires-video-amazon-rainforest-siberia-fire-environment-emissions-a9680311.html

August 24, 2020 Posted by | 2 WORLD, climate change | Leave a comment

28 trillion tonnes of ice have disappeared from the surface of the Earth since 1994.

Guardian 23rd Aug 2020, A total of 28 trillion tonnes of ice have disappeared from the surface of
the Earth since 1994. That is stunning conclusion of UK scientists who have
analysed satellite surveys of the planet’s poles, mountains and glaciers
to measure how much ice coverage lost because of global heating triggered
by rising greenhouse gas emissions.
The scientists – based at Leeds and
Edinburgh universities and University College London – describe the level
of ice loss as “staggering” and warn that their analysis indicates that
sea level rises, triggered by melting glaciers and ice sheets, could reach
a metre by the end of the century.
“To put that in context, every
centimetre of sea level rise means about a million people will be displaced
from their low-lying homelands,” said Professor Andy Shepherd, director
of Leeds University’s Centre for Polar Observation and Modelling.

https://www.theguardian.com/environment/2020/aug/23/earth-lost-28-trillion-tonnes-ice-30-years-global-warming

August 24, 2020 Posted by | ARCTIC, climate change | Leave a comment

Scotland’s Covid-19 recovery and Climate Policy

August 24, 2020 Posted by | climate change, UK | Leave a comment

Global warming is bringing new “fire regime”all too quickly

Record Arctic blazes may herald new ‘fire regime’ decades sooner than anticipated, more https://www.washingtonpost.com/weather/2020/08/14/record-arctic-fires/?arc404=true     Other signs of rapid Arctic warming are evident, including the partial loss of a symbolic Canadian ice shelf, WP,  By Andrew Freedman and Lauren Tierney,  August 14 2020

The Arctic summer of 2019 was supposed to be an outlier. Featuring massive blazes in Siberia, including what scientists strongly suspected were smoldering fires beneath the peat in the carbon-rich soils of the transition zone between the tundra and Arctic taiga, last year set records for emitting planet-warming greenhouse gases via wildfires. Many scientists thought it might be a one-off, considering that computer model projections tend to show that the emergence of such extreme fire years won’t happen until mid-century.

However, this year is proving those scientists wrong. And it raises the unsettling possibility that fire seasons that begin much earlier than average and end later — and affect delicate Arctic ecosystems — could soon be the new normal. Wildfires continue to burn unimpeded across Siberia, as they have since May, after getting an unusually early start to the fire season. A thick blanket of smoke has turned the sky a milky gray in Siberia’s cities, with some smoke making it across the Pacific into Alaska and Canada’s Hudson Bay.

In fact, according to Mark Parrington, senior scientist and wildfire expert at the European Union’s Copernicus Atmosphere Monitoring Service, Siberian wildfire smoke has been seen around the world as it hitches a ride on upper air winds. To track wildfires and estimate their emissions of planet-warming carbon dioxide, black carbon and more, Parrington uses satellite instruments to detect heat signals all over the world.

He and his colleagues then use the temperature of the signals to arrive at an estimate of the energy emitted by each fire, by making the assumption that a particular amount of biomass (plants, grasses and trees, for example) is needed to burn at that temperature. This measure of the rate of radiant heat output from a fire is known as “radiatiative power,” which can then be translated into estimated emissions.

Based on data stretching back to 2003, when the satellite sensors began recording reliable data, Parrington says Arctic fires released more carbon dioxide in June and July this year than during any complete fire season before that. This is an especially noteworthy milestone, since 2019 itself had been a record-breaker for Arctic wildfires. This year, some of the Arctic fires were burning so far north that they were spotted bordering sea ice cover.

Looking at carbon emissions from fires in the Arctic Circle, Parrington says 2020 is already the top year even when the Jan. 1 to Aug. 11 period is considered, vs. the full 365 days for each of the other years. Last year had set a record for such emissions, with 180 megatons of carbon dioxide emitted by Arctic fires, but 2020 has eclipsed it so far, with about 240 megaton through Aug. 11. Parrington said Arctic wildfire emissions rose significantly from June into July, particularly in the northern Russia Sakha Republic, a pattern also observed last year.

“It’s an indicator that something’s changed in the environment there,” he said of the fire activity of the past two summers.

Jessica McCarty, a wildfire expert at Miami University of Ohio with experience working in the Siberian Arctic, said Parrington’s emissions estimates are probably underestimates, since satellites don’t detect the heat signatures from Arctic peat fires. Such blazes smolder without open flames above the surface, consuming ancient organic matter and freeing up planet-warming gases such as methane and carbon dioxide that had been locked away. This, along with permafrost melt, acts to speed up global warming as part of a self-reinforcing cycle.

McCarty has searched through the scientific literature from Arctic nations as part of a report she is co-authoring for the Arctic Council. “This is the type of fire event that would be described by these worst-case modeling scenarios that were supposed to occur mid-century,” she said, adding that we may be 30 years early in seeing such fire impacts, which would require a reevaluation of how the Arctic is responding to global warming.

[Rapid Arctic meltdown in Siberia alarms scientists]

For next year, she’ll be examining when the fire season starts, where it begins, what types of landscapes burn and what the ignition sources are. Once you log a few extreme fire seasons, she says, the extreme becomes the norm, known to fire researchers as a “fire regime.”

“If seven out of 10 years are extreme years, that’s a fire regime,” McCarty said.

She said a review of scientific literature from Russia and other Arctic nations shows that Siberian fires typically subside in mid- to late August, when the first snows arrive in the Far North. But that assumption may need to be revisited, too. If any fires this year continue into September, she said, “I’ll be really shocked. I don’t know that I’ll have words that are ready to be published.”

The fires were touched off by an unusually hot year to date, which has helped dry out the soils and melt snow cover unusually early in the spring.

For example, temperatures have hit record levels even in the Arctic, north of 66 degrees north latitude. A reading of 100.4 degrees (38 Celsius) on June 20 was probably the hottest temperature on record in the Arctic. It was recorded in Verkhoyansk, about 3,000 miles east of Moscow, on June 20.

The people who live in Siberia and other Arctic regions are used to variable weather. In Verkhoyansk, for example, temperatures can drop to minus-50 degrees in the winter and climb into the 70s during the summer. Yet the persistent warmth so far this year has stood out to climate researchers.

[An oil spill in Russia’s Arctic exposes risks for Moscow’s Far North plans]

“What is incredibly unusual is the persistence of the warm signal” in Siberia, said Samantha Burgess, deputy director of the Copernicus Climate Change Service, in an interview. She said the warmth has had significant implications for the region, ranging from clearing out sea ice north of Siberia unusually early in the summer melt season to contributing to permafrost melt that led to a major oil spill in Norilsk, Russia.

Burgess said the temperature spike in Siberia this summer heralds events to come not only there but in other parts of the Arctic, as well, as the region warms at about three times the rate of the rest of the world. She said the Siberian warm streak is likely to occur again and likely to show up in other parts of the Arctic.

It’s really taken people by surprise how quickly these changes have taken place in the Arctic,” Burgess said.

[Siberian heat streak and Arctic temperature record virtually ‘impossible’ without global warming, study says]

The Arctic as a whole has had record warm temperatures from May through July, as measured in the lower atmosphere.

Much of Siberia experienced an exceptionally mild winter, followed by a warmer-than-average spring, and it has been among the most unusually warm regions of the world during the summer as well. During May, parts of Siberia had an average monthly temperature that was a staggering 18 degrees Fahrenheit (10 Celsius) above average for the month, according to the Copernicus Climate Change Service. The unusually mild weather has continued through August so far, as an area of high pressure, or heat dome, has been parked over the Siberian Arctic.

Fires and ice

The summer fire and melt season hasn’t just featured an unusual surge in fires and their harmful emissions. It is also bringing dramatic declines in sea ice and, in one prominent case, long-lasting ice attached to land.

Arctic sea ice extent had been on course to break a record for the lowest extent on record this September, eclipsing the previous record set in 2012. However, ice loss rates have slowed since July, says Walt Meier, a senior scientist at the National Snow and Ice Data Center, and it’s unlikely the record will be broken this year. The reason for the melt slowdown is persistent ice cover north and northwest of Alaska, whereas on the other side of the Arctic, sea ice emptied out early and water temperatures climbed across the Laptev and East Siberian seas.

Meier says warm ocean waters in other parts of the Arctic could continue melting ice throughout the month, despite the weakening energy from the sun as fall approaches. Sea ice typically reaches its minimum extent in early- to mid-September.

A recent study using a computer model found that the Arctic could be seasonally ice-free by 2035, though other studies put the ice-free date later than that. In any case, sea ice decline continues, even if each year does not hit a record low.
With unusually warm conditions settling over northern Canada, a substantial portion of the remaining sections of the Milne Ice Shelf — Canada’s last remaining intact ice shelf, broke off Ellesmere Island, Nunavut, between July 28 and July 31, according to the Canadian Ice Service and newly released satellite photos from Planet Labs. The ice shelf — a floating tongue of ice attached to glacier that rests on bedrock, was vulnerable to melting from mild air temperatures above and relatively mild ocean temperatures below.

Similar dynamics are playing out in Greenland and Antarctica, where massive glaciers have been destabilized by the disintegration of their ice shelves, which act as doorstops that prevent inland ice from sliding into the sea, where it would dramatically raise sea levels.

Before the breakup of the Canadian shelf into large icebergs, it was about the size of D.C., the Associated Press has reported.

Chart data compiled by Mark Parrington of the Copernicus Atmosphere Monitoring Service. Map data compiled using Suomi NPP satellite VIIRS instrument by Shobha Kondragunta, Yunyue Yu, Chuanyu Xu, Peng Yu and Pubu Ciren of the NOAA/NESDIS Center for Satellite Applications and Research. Data for smoke and land surface temperature is obtained from NOAA JPSS Program Soumi-NPP satellite Visible Infrared Imaging Radiometer Suite (VIIRS).

 

August 22, 2020 Posted by | ARCTIC, climate change | Leave a comment

France’s nuclear energy continues to be hit by global heating, drought, water shortage

Low flow rate may halve output at France’s Saint-Alban nuclear plant,  https://in.reuters.com/article/france-nuclear/low-flow-rate-may-halve-output-at-frances-saint-alban-nuclear-plant-idINL8N2FM54B   PARIS, Aug 20 (Reuters) – A low flow rate on the Rhone River will likely restrict output on Saturday and Sunday at EDF’s Saint-Alban nuclear plant in southeastern France, French grid operator RTE said on Thursday.The two Saint-Alban reactors produce 1.3 gigawatts (GW) of power each, and the output reduction could be equivalent to the production of one unit, RTE said.

EDF’s use of water is regulated by law to protect plant and animal life. It is obliged to reduce output during hot weather when water temperatures rise, or when river levels and the flow rate are low.

Last month was the driest July in at least 60 years and the first half of August was the second hottest on record, making it the fifteenth consecutive month with higher than average temperatures, Meteo France data showed.

RTE published a similar warning for the Chooz reactors in northern France on Tuesday, as low water levels on the Meuse river risk extending current maintenance periods.

French nuclear availability is currently at 63.6% of total capacity, with 22.7 GW offline. (Reporting by Forrest Crellin; Editing by Jan Harvey)

August 22, 2020 Posted by | climate change, France | Leave a comment