Climate extremes in Svalbard over the last two millennia are linked to atmospheric blocking, say researchers

Article: ‘Since observational measurements started, blocking in the Arctic has increased, as has Arctic warming.’ When researchers investigated ‘they found a stunning correlation’. No mention of greenhouse gases in the study.
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A team of scientists led by François Lapointe, a research associate at the University of Massachusetts Amherst, has combined paleoclimatic data from the last 2,000 years with powerful computer modeling and in-the-field research on lake sediments and tree rings to show that an understudied phenomenon, known as atmospheric blocking, has long influenced temperature swings in the Arctic.

As temperatures warm due to climate change, claims EurekAlert, atmospheric blocking will help drive ever-wilder weather events. [Talkshop comment – routine alarmist hype].

The study focused on the Norwegian Arctic archipelago, Svalbard, at the edge of the Arctic Ocean, and was published in Nature Communications.

Oldie but Goldie: Climategate: how the conspirators gagged on their deceptions

Andrew Bolt Herald Sun Dec 6 2009

I’ve wondered whether Climategate scientist Tom Wigley, an Australian, finally choked on all the fraud, fiddling and coverups he was witnessing from fellow members of his Climategate cabal. Steven Hayward points out that many other Climategate scientists privately had trouble swallowing the practices of their colleagues:

In 1998 three scientists from American universities–Michael Mann, Raymond Bradley, and Malcolm Hughes–unveiled in Nature magazine what was regarded as a signal breakthrough in paleoclimatology–the now notorious “hockey stick” temperature reconstruction (picture a flat “handle” extending from the year 1000 to roughly 1900, and a sharply upsloping “blade” from 1900 to 2000). Their paper purported to prove that current global temperatures are the highest in the last thousand years by a large margin–far outside the range of natural variability. The medieval warm period (MWP) and the little ice (LIA) age both disappeared.

600 years of tree rings reveal climate variability in California, droughts and floods more severe and longer lasting than in the modern record

California’s San Joaquin Valley and Central Valley [image credit: Mark Miller @ Wikipedia]

The region studied has a naturally varying climate, as do most regions of the world. One minute the article says the last few centuries there had more weather extremes than now, the next it implies the future could or will be like that again or worse, due to being ‘compounded’ by the catch-all *climate change*. File under ‘unconvincing’?
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The San Joaquin Valley in California has experienced vast variability in climate extremes, with droughts and floods that were more severe and lasted longer than what has been seen in the modern record, according to a new study of 600 years of tree rings from the valley, says Eurekalert.

The researchers used the tree rings to reconstruct plausible daily records of weather and streamflow scenarios during the 600-year period.

This new approach, combining paleo information with synthetic weather generation, may help policymakers and scientists better understand – and anticipate – California’s flood and drought risks and how they will be compounded by climate change. [Talkshop comment – unsupported assertion].

The group’s paper is published in Earth’s Future, a journal of the American Geophysical Union.

New research says orbital factors show why and when the Sahara Desert was green

Sahara desert from space [image credit: NASA]

No trace gases required to drive these climate processes. It was found that ‘the North African Humid Periods occurred every 21,000 years and were determined by changes in Earth’s orbital precession.’
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A pioneering study has shed new light on North African humid periods that have occurred over the past 800,000 years and explains why the Sahara Desert was periodically green, says Science Daily.

The research, published in Nature Communications, showed periodic wet phases in the Sahara were driven by changes in Earth’s orbit around the Sun and were suppressed during the ice ages.

For the first time, climate scientists simulated the historic intervals of ‘greening’ of the Sahara, offering evidence for how the timing and intensity of these humid events were also influenced remotely by the effects of large, distant, high-latitude ice sheets in the Northern Hemisphere.

Study attributes Tibetan Empire collapse in 9th century to climate change

Historical reconstruction of the Tibetan Empire’s extent among surrounding empires at its peak ca. 800 CE [Credit: Chen et al. 2023]

The ‘abrupt’ climate change found by the researchers looks like a prelude to the Medieval Warm Period. Even without examining any technical details it’s clear from the data that the climate of the region did change. Interestingly, the aftermath of the period of change looks a lot like the Medieval Warm Period (see here, under ‘severe dry and warm’), which Wikipedia thinks ‘was a time of warm climate in the North Atlantic region that lasted from c. 950 to c. 1250’. The North Atlantic and Tibet are far apart, obviously.
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The Tibetan Empire was the world’s highest elevation empire, sitting over 4,000m above sea level, and thrived during 618 to 877 CE, says Phys.org.

Home to an estimated 10 million people, it spanned approximately 4.6 million km² across East and Central Asia, extending into northern India.

Considering the hostile conditions for populations to expand, including hypoxia where oxygen concentrations are 40% lower than at sea level, it is incredible that the empire flourished.

However, its collapse in the 9th century is not fully understood, with new research published in Quaternary Science Reviews aiming to untangle the role climate may have played in the end of a great civilization.

Fresh understanding of ice age frequency – Otago study

Ross Ice Shelf, Antarctica

By saying, of Antarctica’s ice sheets, “this research shows they actually advanced and retreated much more often – every 41,000 years – until at least 400,000 years ago”, the research adds a new twist to the longstanding 100,000 year problem of ice ages. It puts obliquity firmly back in the frame.
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A chance find of an unstudied Antarctic sediment core has led University of Otago researchers to flip our understanding of how often ice ages occurred in Antarctica, says Eurekalert.

Lead author Dr Christian Ohneiser, of the Department of Geology, says it turns out they were much more frequent than previously assumed.

“Until this research, it was common knowledge that over the last million years global ice volume, which includes Antarctica’s ice sheets, expanded and retreated every 100,000 years.

“However, this research shows they actually advanced and retreated much more often – every 41,000 years – until at least 400,000 years ago,” he says.

Earth can regulate its own temperature over millennia, new study finds

This schematic shows the relationship between the different physical and chemical processes that make up the carbonate-silicate cycle. In the upper panel, the specific processes are identified, and in the lower panel, the feedbacks associated are shown; green arrows indicate positive coupling, while yellow arrows indicate negative coupling [image credit: Gretashum @ Wikipedia]

There’s always been a carbonate–silicate cycle, which Wikipedia declares ‘is the primary control on carbon dioxide levels over long timescales’. Warmists have shoe-horned this into their atmospheric theories, as we can see from the appearance of ‘greenhouse effect’ in the graphic above. Carry on, Earth.
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The Earth’s climate has undergone some big changes, from global volcanism to planet-cooling ice ages and dramatic shifts in solar radiation, says Eurekalert.

And yet life, for the last 3.7 billion years, has kept on beating.

Now, a study by MIT researchers in Science Advances confirms that the planet harbors a “stabilizing feedback” mechanism that acts over hundreds of thousands of years to pull the climate back from the brink, keeping global temperatures within a steady, habitable range.

Just how does it accomplish this?

Story of Ötzi the Iceman gets multi-glaciation rewrite from researchers

Ötztaler Alps, Austria [image credit: Kogo @ Wikipedia]

In this new version, the idea that the famous body was only found due to recent warming after being under ice continuously for over 5000 years gets buried, so to speak. The sting in the tail is this: ‘the researchers also found evidence suggesting that Ötzi had not died where he was found in the gully — instead, he had been transported down the mountain by natural environmental processes’. If, as they say, he ‘had melted out of the ice many times’, those times must have occurred at various higher levels, suggesting greater warming then than we (so far) see today. This poses an awkward question or two for prevalent climate theories.
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A small team of researchers affiliated with institutions in Norway, Sweden and Austria, has found evidence that suggests a flaw in the original story of how Ötzi (the Iceman) remained preserved for so long, says Phys.org.

In their paper published in the journal The Holocene, the group details what they describe as a more plausible explanation.

In 1991, a couple of German hikers came upon the remains of a man frozen in the ice in the Ötztal Alps. Testing of the remains showed the man to be from approximately 5,300 years ago.

Dinosaurs survived when CO2 was extremely high. Why can’t humans?

Current rates of temperature increase, if accurate, don’t look all that startling despite the odd few hot days. For example, Roy Spencer reports a linear warming trend of +0.13C per decade since 1979. We know previous cooling trends must have occurred over the centuries from the regular advance and retreat of glaciers, to cite one obvious line of evidence. Focussing on CO2 all the time is a bit like looking through the wrong end of the telescope.
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How did plants and animals survive around 200 million years ago when the carbon dioxide concentration went up to 6,000 parts per million?

Paul Olsen, a geologist and paleontologist at Columbia Climate School’s Lamont-Doherty Earth Observatory, walked us through what scientists know about carbon dioxide levels over time, says Phys.org.

Although no one was around to measure the atmosphere’s CO2 concentration millions of years ago, paleoclimatologists can reconstruct past temperature and carbon dioxide levels using ice cores, tree rings, corals, ancient pollen, and sedimentary rocks.

These natural recorders of climate fluctuations can also reveal how various animals and plants thrived or perished during different geological periods.

New study may solve long-standing mystery of what triggered ice age

Canadian Arctic archipelago [via Wikipedia]

The clue is in the study title: The importance of Canadian Arctic Archipelago gateways for glacial expansion in Scandinavia.
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A new study led by University of Arizona researchers may have solved two mysteries that have long puzzled paleo-climate experts (says Phys.org): Where did the ice sheets that rang in the last ice age more than 100,000 years ago come from, and how could they grow so quickly?

Understanding what drives Earth’s glacial–interglacial cycles—the periodic advance and retreat of ice sheets in the Northern Hemisphere—is no easy feat, and researchers have devoted substantial effort to explaining the expansion and shrinking of large ice masses over thousands of years.

The new study, published in the journal Nature Geoscience, proposes an explanation for the rapid expansion of the ice sheets that covered much of the Northern Hemisphere during the most recent ice age, and the findings could also apply to other glacial periods throughout Earth’s history.

Researchers reveal variations in Arctic amplification effect during past millennium

Arctic sea ice [image credit: cbc.ca]

The researchers find ‘a significantly declining AA effect on the millennial time scale’ — but then attempt to link that to anthropogenic forcing in recent times, according to the article at least. That seems illogical if the argument is that humans are playing a part. In any case if the effect has been shown to occur over at least a millennium, that in itself casts doubt on claims that humans must be the prime (or any) cause of the most recent observed changes.
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The recent amplified warming in the Arctic during the last decades has received much attention, says Phys.org.

But how Arctic amplification (AA) has varied on longer time scales and what drives these variations remain unclear.

Recently, a study has provided a new perspective on the AA effect during the past millennium based on the best available paleoclimate data and novel data assimilation methods.

The Palaeoclimate Problem – Net Zero Watch

The author notes, with examples, that ‘it is difficult to reconcile this latest research with many other lines of inquiry to determine past temperatures.’ Using a single computer model to ‘fill in gaps’ in data has its own drawbacks, as mentioned below.
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Modern warming differs from the gradual rise in temperature seen in the past 10,000 years. That’s the conclusion of a paper just published in the journal Nature, says David Whitehouse.

Reconstructing the temperature timeline back to 24,000 years ago – the so-called Last Glacial Maximum – a team of researchers show that recent warming is unusual.

Knowledge of past climate is important to put our present climate into context, allowing us to see what climatic variations can take place in the absence of contemporary amounts of greenhouse gasses.

Earth Tipped on Its Side 84 Million Years Ago, New Evidence Suggests

Diagram showing solid-body rotation of the Earth with respect to a stationary spin axis due to true polar wander. [Credit: Wikipedia]

The researchers say their finding ‘challenges the notion that the spin axis has been largely stable over the past 100 million years.’
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We know that true polar wander (TPW) can occasionally tilt whole planets and moons relative to their axes, but it’s not entirely clear just how often this has happened to Earth, says ScienceAlert.

Now a new study presents evidence of one such tilting event that occurred around 84 million years ago – when dinosaurs still walked the Earth.

Researchers analyzed limestone samples from Italy, dating back to the Late Cretaceous period (100.5 to 65.5 million years ago), looking for evidence of shifts in the magnetic record that would point towards an occurrence of TPW.

Bacteria fossils trapped in the rock, forming chains of the mineral magnetite, offer some of the most convincing evidence yet of true polar wander in the Late Cretaceous – and it may help settle a scientific debate that’s been going on for decades.

Climate model shows drought in North and South America at the same time during La Niña events

La Niña pending

Natural climate change has always been around, as this study indicates. Attempts at attribution of weather-related conditions like droughts to recent (in historical terms) fuel-burning activities are full of pitfalls and uncertainties.
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A team of researchers at Columbia University has shown that long-term droughts in southwestern parts of North America and in southwestern parts of South America have occurred at the same time on multiple occasions over the past 1,000 years coinciding with La Niña events, reports Phys.org.

In their paper published in the journal Nature Geoscience, the group describes how they used archival data and paleoclimate proxies (materials preserved in the geologic record that can be used to estimate climate conditions) to create climate models.

La Niña events are climatic occurrences that are kicked off when trade winds in the Pacific Ocean are pushed toward Asia. This results in a cooling effect in the waters off the coasts of North and South America. It pushes the jet stream northward just enough to create drier conditions across parts of both continents.

The 27.5-million-year cycle of geological activity

Scientists previously proposed 26 million year cycles of mass extinctions, but this appears to correct the period. They suggest ‘cycles of activity in the Earth’s interior’ could be behind their new period, but then say: ‘However, similar cycles in the Earth’s orbit in space might also be pacing these events.’ Their study also says ‘a strong secondary signal occurs at a period 8.9 Myr’.
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Geologic activity on Earth appears to follow a 27.5-million-year cycle, giving the planet a ‘pulse,’ according to a new study published in the journal Geoscience Frontiers. Phys.org reporting.

“Many geologists believe that geological events are random over time. But our study provides statistical evidence for a common cycle, suggesting that these geologic events are correlated and not random,” said Michael Rampino, a geologist and professor in New York University’s Department of Biology, as well as the study’s lead author.

Over the past five decades, researchers have proposed cycles of major geological events—including volcanic activity and mass extinctions on land and sea—ranging from roughly 26 to 36 million years.

But early work on these correlations in the geological record was hampered by limitations in the age-dating of geologic events, which prevented scientists from conducting quantitative investigations.

Unmatched dust storms raged over Western Europe during Ice age maximum

Image credit: ScienceDaily

This has echoes of the ice age dust/albedo theory – with no CO2 feedbacks – proposed by Ralph Ellis a few years ago. The article concludes: ‘The result thus has the potential to aid the understanding of the abrupt warming and cooling periods during the ice ages called Dansgaard/Oeschger events which bear the marks of climate tipping points.’
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Every late winter and early spring, huge dust storms swirled across the bare and frozen landscapes of Europe during the coldest periods of the latest ice age, says Phys.org.

These paleo-tempests, which are seldom matched in our modern climate frequently covered Western Europe in some of the thickest layers of ice-age dust found anywhere previously on Earth.

This is demonstrated by a series of new estimates of the sedimentation and accumulation rates of European loess layers obtained by Senior Research Scientist Denis-Didier Rousseau from Ecole Normale Supérieure in Paris, France, and colleagues.

The work, which is published in Quaternary Science Reviews is part of the TiPES project on tipping points in the Earth system, coordinated by The University of Copenhagen.

In the study Denis-Didier Rousseau and colleagues reinterpreted layers in loess from Nussloch, Germany.

Loess is a fine-silt-sized earth type found all over the world. It mainly consists of aeolian sediments, which are materials transported by the wind from dry areas without vegetation such as deserts of any type, moraines, or dried-out river beds.

Within the aeolian sediments, darker layers of paleosol alternate within the loess layers. Every layer in the loess represents a shift in climatic conditions.

Large-scale changes in Earth’s climate may originate in the Pacific

Some interesting theorising arises from this research, but as one expert commented: “These new data may raise more questions than they answer.” At least one existing belief about long-term climate change finds itself challenged.
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The retreat of North America’s ice sheets in the latter years of the last ice age may have begun with “catastrophic” losses of ice into the North Pacific Ocean along the coast of modern-day British Columbia and Alaska, scientists say.
[Science News reporting].

In a new study published October 1 in Science, researchers find that these pulses of rapid ice loss from what’s known as the western Cordilleran ice sheet contributed to, and perhaps triggered, the massive calving of the Laurentide ice sheet into the North Atlantic Ocean thousands of years ago.

That collapse of the Laurentide ice sheet, which at one point covered large swaths of Canada and parts of the United States, ultimately led to major disturbances in the global climate (SN: 11/5/12).

The new findings cast doubt on the long-held assumption that hemispheric-scale changes in Earth’s climate originate in the North Atlantic (SN: 1/31/19).

Earth’s Ancient Barometric Pressure

Image credit: theonlinefisherman.com

A rare chance to brush up on your *vesicle paleobarometry* — or to put it another way, learn that air pressure at sea level has not always been around the 1 bar (1000 mb) that we expect to find nowadays. According to the ideal gas law, pressure and temperature are closely related, implying historic climate variability, but results so far seem inconclusive.

NASA says:
Researchers supported in part by the NASA Astrobiology Program have attempted to better understand global barometric pressure on Earth during the Archaean by studying vesicle sizes in 2.9 billion year-old lavas that erupted near sea level.

Today, Earth’s global barometric pressure is 1 bar at sea level. However, barometric pressure has changed throughout the planet’s history.

405 kyr Jupiter-Venus driven Earth eccentricity cycle linked to paleoclimatic variation

A recent review article on PNAS titled ‘Astronomical metronome of geological consequence’ by Linda Hinnov makes interesting reading for talkshoppers.

A Brief Retrospective
In geology, a reliable “metronome” in the geologic record with a sufficiently short repeat time would greatly enhance the resolving power of the geologic timescale. Astronomers recognized the potential importance of a dominant 405-ky cycle in Earth’s orbital eccentricity variation for supplying such a metronome (2, 3), leading geologists to turn to the stratigraphic record of astronomically forced paleoclimate change to search for this cycle. In fact, one of the first geological studies to describe 405-ky scale stratigraphic cycling was on the Triassic–Jurassic Newark Basin lacustrine strata (4, 5) recovered in the National Science Foundation-funded Newark Basin Coring Project, in which each of the prominent 60-m-thick McLaughlin cycles in the cored sequence was assigned a 412.885- ky periodicity based on a now-legacy analytical astronomical solution, BRE74/BER78 (6, 7). Since the 1990s, there have been dozens of reports for strong 405-ky scale cycles in stratigraphic sequences from around the world that appear to bear out this astronomical calculation (8).

California’s current earthquake hiatus is an unlikely pause

1989 Loma Prieta earthquake damage [image credit: H.G. Wilshire, U.S. Geological Survey]

Smaller quakes seem to have taken over, for the time being at least. The Loma Prieta earthquake of 1989 in Northern California had a magnitude of 6.9 but was not considered to be ‘major’, despite some deaths and billions of dollars worth of damage.

There have been no major ground rupturing earthquakes along California’s three highest slip rate faults in the past 100 years, reports ScienceDaily.

A new study concludes that this current ‘hiatus’ has no precedent in the past 1000 years.

U.S. Geological Survey researchers Glenn Biasi and Kate Scharer analyzed long paleoseismic records from the San Andreas, San Jacinto and Hayward Faults for the past 1000 years, to determine how likely it might be to have a 100-year gap in earthquakes across the three faults.

They found that the gap was very unlikely — along the lines of a 0.3% chance of occurring, given the seismic record of the past 1000 years.