Showing posts with label Global heating. Show all posts
Showing posts with label Global heating. Show all posts

Tuesday, 8 September 2020

Arctic ocean moorings shed light on winter sea ice loss

Science Daily
A table iceberg in the Norwegian Arctic. Such icebergs are rare
as they calve from shelf ice, which is also rare. They're normally
a typical form of iceberg in the Antarctic. This one is about 12m high
and about half the size of a soccer field. Photo by Andreas Weith.
The eastern Arctic Ocean's winter ice grew less than half as much as normal during the past decade, due to the growing influence of heat from the ocean's interior, researchers have found. Story here.


Sunday, 30 August 2020

New research finds - global heating is melting vast northern fields of permafrost so fast that - within decades - they'll likely stop cooling the planet as they have for millennia - and start doing just the opposite.

by Larry Powell
Permafrost Slide at Big Fox Lake, Ontario, Canada - 2015.
A Creative Commons photo by MIKOFOX. 



For thousands of years, so-called "permafrost peatlands" in Earth's Northern Hemisphere have been cooling the global climate. They’ve done it by trapping large amounts of carbon and nitrogen which would otherwise escape into the air as harmful greenhouse gases. 

More recently however, scientists have observed, they've been melting due to manmade global heating. As they melt, they're releasing large amounts of substances like methane - a potent greenhouse gas - into the air. 

But, without proper maps, it's been hard for scientists to get a handle on the degree to which this might be happening - until now. New ones drawn up using thousands of field observations, show; Permafrost peatlands cover a vast area of almost four million square kilometres.

And, to quote from the study, "Under future global warming scenarios, half to nearly all of peatland permafrost could be lost this century.” 

This means their age-old role, mostly as net “sinks,” keeping harmful greenhouse gases in the ground, would transform to a net source of atmospheric carbon, primarily methane.

A permafrost "slump" in Alaska. A USGS photo.

The research concludes that, “Although northern peatlands are currently a source of global cooling, permafrost thaw attributable to anthropogenic climate warming may convert peatlands into a net source of warming."

The findings were published recently in PNAS, the proceedings of the National Academy of Sciences (US). 

But the impact of the nitrogen trapped in these fields cannot be underestimated, either. A separate study, also published in PNAS about three years ago, reveals, "Some 67 billion tons of it, accumulated thousands of years ago, could now become available for decomposition, leading to the release of nitrous oxide (N2O) to the atmosphere. N2O is a strong greenhouse gas, almost 300 times more powerful than CO2 for warming the climate. Although carbon dynamics in the Arctic are well studied, the fact that Arctic soils store enormous amounts of nitrogen has received little attention so far. We report that the Arctic may become a substantial source of N2O when the permafrost thaws, and that N2O emissions could occur from surfaces covering almost one-fourth of the entire Arctic."


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Sunday, 9 August 2020

Global death rate from rising temperatures projected to surpass the current death rate of all infectious diseases combined

The Climate Impact Lab
A PinP photo.

This summer, the world is experiencing record hot temperatures: A weather station in Death Valley, California, clocked one of the hottest temperatures ever observed on Earth. Simultaneously, the coronavirus pandemic’s devastating mortality impact and economic fallout are demanding society prioritize public health like never before. Details here.

Tuesday, 28 April 2020

Meteorologists say 2020 on course to be hottest year since records began

The Guardian
A PinP photo.
Global lockdowns have lowered emissions but longer-term changes needed, say scientists. 
Story here.

Saturday, 18 January 2020

Like Adding'Five to Six Hiroshima Bombs of Heat Each Second,' Study Shows Oceans Warming at Record Rate


CommonDreams
"If you want to understand global warming, you have to measure ocean warming." Story here.



Saturday, 23 November 2019

Nearly all (North) America's endangered species will struggle to adapt to climate crisis


The Guardian
An emaciated moose in Riding Mtn. National Park, Canada.
A PinP photo.
All but one of 459 species have traits making them vulnerable to rising temperatures, study finds.
Story here.

To quote from the initial study in Nature, Climate Change: 

"Climate change is a threat to ecosystems and biodiversity globally and has emerged as a driver of observed and potential species decline and extinction. Government laws and policies should play a vital role in supporting climate change adaptation for imperilled species, yet imperilled species protections have been critiqued as insufficient in Australia, Canada and Europe." 
PinP

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Wednesday, 24 July 2019

Modern Climate Change Is the Only Worldwide Warming Event of the Past 2,000 Years


Smithsonian.com
New research finds that previous periods of warming and cooling driven by natural causes were regional shifts in temperature rather than global events. Story here.
A grey heron suffers during a heatwave - 2013.
Photo by Gail Hampshire from Cradley, Malvern, U.K


Monday, 3 June 2019

Downpours of torrential rain more frequent with global warming


PHYS ORG
Flooding in Saskatchewan. A PinP photo.
The frequency of downpours of heavy rain—which can lead to flash floods, devastation, and outbreaks of waterborne disease—has increased across the globe in the past 50 years, research led by the University of Saskatchewan (USask) has found. Story here.

Friday, 17 May 2019

‘Extraordinary thinning’ of ice sheets revealed deep inside Antarctica


The Guardian
Antarctica. Wikimedia public domain. 
New research shows affected areas are losing ice five times faster than in the 1990s, with more than 100m of thickness gone in some places. Story here.

Wednesday, 22 August 2018

Global warming will expose millions more to floods


Phys.Org

East Village in Calgary during epic flooding in Alberta in 2013. Ryan L. C. Quan

Global warning is expected to unleash more rain, exposing millions more people to river flooding particularly in the US and parts of Asia, Africa and Central Europe. Read more here.

Tuesday, 21 August 2018

Arctic’s strongest sea ice breaks up for first time on record



 The Guardian
Image Credit: NASA/Operation IceBridge
Usually frozen waters open up twice this year in phenomenon scientists described as scary. More here.

Monday, 30 April 2018

A British vessel leads £20m mission to melting Antarctic glacier

The Guardian

British and US scientists are to examine the risk of the Thwaites glacier collapsing, which is already responsible for a 4% sea-level rise. More here.

Thwaites Glacier. European Space Agency

Wednesday, 8 November 2017

Stephen Hawking Says Earth Will Become ‘Sizzling Ball of Fire’ in 600 Years

EcoWatch









PinP photo
Last year, scientist Stephen Hawking gave humans a shelf-life of 1,000 more years on EarthApparently, 2017 hasn't been to his liking—as Hawking shaved another 400 years off that prediction. Story here.

Thursday, 24 August 2017

Big business and big oil lose climate battle in pipeline review

NATIONAL OBSERVER

Canada's National Energy Board has rejected recommendations from big business and big oil, agreeing for the first time in its history to consider both upstream and downstream greenhouse gas emissions while reviewing a major pipeline project. Story here

Saturday, 5 August 2017

Extreme heat warnings issued in Europe as temperatures pass 40C

TheGuardian
PinP photo.
Authorities in 11 countries warn residents and tourists to take precautions amid region’s most intense heatwave – nicknamed Lucifer – since 2003. Story here.

Could a million freshwater turtles help clean up some of Australia's polluted rivers? A team of scientists believes, they could!

by Larry Powell The freshwater turtle, Emydura macquarii. Credit: Claudia Santori. For well over a century,  freshwater fis...