Sea Ice Extent (Global Antarctic and Arctic) – Day 227 – 2018

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Nir Shaviv: The missing link between exploding stars, clouds and climate on Earth

Tallbloke's Talkshop

Nir Shaviv is co-author along with Henrik Svensmark and others of a major new paper in Nature Communications titled Increased ionization supports growth of aerosols into cloud condensation nuclei. He has a write up at his Sciencebits blog. Here’s the introduction:

Our new results published today in nature communications provide the last piece of a long studied puzzle. We finally found the actual physical mechanism linking between atmospheric ionization and the formation of cloud condensation nuclei. Thus, we now understand the complete physical picture linking solar activity and our galactic environment (which govern the flux of cosmic rays ionizing the atmosphere) to climate here on Earth though changes in the cloud characteristics. In short, as small aerosols grow to become cloud condensation nuclei, they grow faster under higher background ionization rates. Consequently, they have a higher chance of surviving the growth without being eaten by larger aerosols. This…

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Coral Bleaching Just As Bad In 18thC

NOT A LOT OF PEOPLE KNOW THAT

By Paul Homewood

A new study finds that coral bleaching on the Great Barrier Reef is nothing new.

From the Evening Express:

image

Large-scale coral bleaching has raised concern about the future of the ecosystems and the impact their loss could have on biodiversity.

Dr Sebastian Hennige, researcher

The teams found the frequency of bleaching has increased since the 1800s and, despite corals’ ability to recover, there are fears they could now be approaching a “critical threshold”.

Dr Nick Kamenos from Glasgow’s School of Geographical and Earth Sciences said: “It’s clear in the core data we examined that bleaching has been occurring on the Great Barrier Reef for at least 400 years, but the frequency of bleaching events has increased markedly since the early 1800s and those events have affected 10% more corals since the late 1700s.

“We can see that corals have been able to acclimate and recover from past…

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Brace yourself: more starving polar bear news stories in the pipeline from Svalbard

polarbearscience

A few polar bears have become stranded on small islands north of Svalbard since the local sea ice retreated — of which the bear that mauled a cruise ship guard last month was but one — and if return of the ice is as late as last year, those handful of bears are likely doomed to die of starvation. This is not due to climate change but rather bad judgment on the part of these few bears. They were not forced ashore: if they’d stayed on the ice like the rest of the population, they’d have likely been just fine.

Daily Mail stranded bear headline_3 Aug 2018 all

Similar to the bear in northwestern Hudson Bay that fatally mauled a young father in early July, these bears were likely lured ashore by the prospect of masses of bird eggs present on island rookeries. But they overstayed their window of opportunity and the ice retreated without them.

Fledgling birds…

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Climate Change and Forest Fire Fact Check

Sierra Foothill Commentary

The Charge: Timothy White, California State University Chancellor

“Nearly everyone agrees that climate change is the biggest environmental challenge facing California and the world. Communities across California are experiencing firsthand the effects of devastating wildfires, persistent droughts, agricultural anomalies and public health crises because of our changing climate.

The Facts: Climatologist Dr. John Christy ‘Our most serious heatwaves were in the 1930’s. We have not matched those at all”

What about the fires and heat waves?

According to the National Interagency Fire Center, fires were burning in fifteen states as of Tuesday, August 14.

Alaska reported seventeen fires, Arizona reported eleven, both Oregon and Colorado reported ten, and California reported nine.

Much of the news media’s discussion about these fires over the past few weeks has established a correlation between the many fires and anthropogenic climate change, a correlation that Dr. Christy rejects.
Christy argues that exacerbating fires out west…

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Diving robots find Antarctic winter seas exhale surprising amounts of carbon dioxide

Tallbloke's Talkshop

Antarctica
Researchers describe this as ‘a major challenge to our current understanding’. The global carbon cycle model may have to be revisited.

More than 100 oceanic floats are now diving and drifting in the Southern Ocean around Antarctica during the peak of winter, reports Phys.org.

These instruments are gathering data from a place and season that remains very poorly studied, despite its important role in regulating the global climate.

A new study from the University of Washington, the Monterey Bay Aquarium Research Institute, Princeton University and several other oceanographic institutions uses data gathered by the floating drones over past winters to learn how much carbon dioxide is transferred by the surrounding seas.

Results show that in winter the open water nearest the sea ice surrounding Antarctica releases significantly more carbon dioxide than previously believed.

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Christy’s Common Sense about Climate

Science Matters

An insightful straight-forward interview with Dr. John Christy published today at yellowhammernews  Alabama’s state climatologist John Christy rebuts claims of recent fires, heat waves being caused by human activity(H/T Climate Depot) Excerpts in italics with my bolds.

There is one particular word that Dr. John Christy turns to frequently for describing climate science: murky.

It’s a point of view foundational to his own research, and a message underpinning each of his twenty appearances before various congressional committees.

“It’s encouraging because they wouldn’t invite you back unless your message was compelling and not only compelling, but accurate,” Christy, Alabama’s state climatologist, told Yellowhammer News in an interview.

Christy, whose day job involves doing research and teaching as the Distinguished Professor of Atmospheric Science at the University of Alabama in Huntsville (UAH), has gained notoriety over the years for dissenting from mainstream climate scientists and policymakers who argue that climate…

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Ocean SSTs Lower in July

Science Matters

globpop_countriesThe best context for understanding decadal temperature changes comes from the world’s sea surface temperatures (SST), for several reasons:

  • The ocean covers 71% of the globe and drives average temperatures;
  • SSTs have a constant water content, (unlike air temperatures), so give a better reading of heat content variations;
  • A major El Nino was the dominant climate feature in recent years.

HadSST is generally regarded as the best of the global SST data sets, and so the temperature story here comes from that source, the latest version being HadSST3.  More on what distinguishes HadSST3 from other SST products at the end.

The Current Context

The chart below shows SST monthly anomalies as reported in HadSST3 starting in 2015 through July 2018.Hadsst072018A global cooling pattern has persisted, seen clearly in the Tropics since its peak in 2016, joined by NH and SH dropping since last August. Upward bumps occurred last October…

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Summer “Hothouse” Silliness

Science Matters

This summer’s heat waves are having an unfortunate side effect. Some scientists who should know better are shouting wild claims as though their heads were exploding.  Paleoclimatologists use terms like “Hothouse” Earth and “Icehouse” Earth referring to our planet’s climate shifts over many eons.  One good old-fashioned hot summer is not a transition, or even an harbinger of an “Hothouse” world.  More importantly, the distribution of temperatures in a warmer world is not the hell on earth depicted by these folks who have lost their bearings.

A powerful post by Clive Best describes how earth’s surface temperatures change by means of changing meridional heat transfers. See Meridional Warming.

The key point for me was seeing how the best geological knowledge proves beyond the shadow of a doubt how the earth’s climate profile shifts over time, as presented in the diagram above.  It comes from esteemed paleoclimatologist Christopher Scotese.  His compete…

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Nature Unbound X – The next glaciation

Climate Etc.

by Javier

Summary: The IPCC expresses virtual certainty that a glaciation is not possible for the next 50 Kyr if CO2levels remain above 300 ppm. It is the long interglacial hypothesis. Analysis of interglacials of the past 800 Kyr shows they depend on obliquity-linked summer energy, ice-volume, and eccentricity, and they end at glacial inception after ~ 6000 years of Neoglaciation-type temperature decline. The lag between orbital forcing and ice volume change indicates the orbital threshold for glacial inception is crossed thousands of years before glacial inception, and the Holocene went through that threshold long ago. In the absence of sufficient anthropogenic forcing glacial inception should take place in 1500-2500 years. The long interglacial hypothesis rests on the wrong astronomical parameter, high-equilibrium climate sensitivity to CO2, and uncertain model predictions of very long-tailed CO2decay. It is not possible to determine at present if…

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