Archives par mot-clé : Warming

Finally! The missing link between exploding stars, clouds and climate on Earth

by Shaviv, December  19, 2017 in ScieneBits/fromNature


By Henrik Svensmark and Nir shaviv

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 effect was calculated theoretically and measured in a specially designed experiment conducted at the Danish Space Research Institute at the Danish Technical University, together with our colleagues Martin Andreas Bødker Enghoff and Jacob Svensmark.

Background:

It has long been known that solar variations appear to have a large effect on climate. This was already suggested by William Herschel over 200 years ago. Over the past several decades, more empirical evidence have unequivocally demonstrated the existence of such a link, as exemplified in the examples in the box below.

Climatologist: Climate Models Are Predicting Too Much Warming

by Dr. Benny Peiser, May 23, 2019 in GWPF


A leading climatologist has said that the computer simulations that are used to predict global warming are failing on a key measure of the climate today and cannot be trusted.

Speaking to a meeting in the Palace of Westminster in London, Professor John Christy of the University of Alabama in Huntsville told MPs and peers that almost all climate models have predicted rapid warming at high altitudes in the tropics:

A paper outlining Dr. Christy’s key findings is published today by the Global Warming Policy Foundation.

CBC Claims Canada Warming Twice As Fast As Globe, Yet Data Tell A Different Story: No Warming In 25 Years!

by P. Gosselin, April 3, 2019 in NoTricksZone


Canada’s CBC here recently cited “a leaked report” which claimed Canada is “warming at twice the global rate.”

According to the “leaked report”, Canada’s annual average temperature over land has warmed 1.7 C when looking at the data since 1948. But that claim is misleading when recent data is considered.

Over the past 25 years, since scientists began to warn that the planet was warming in earnest, there has not been any warming when one looks at the untampered data provided by the Japan meteorology Agency (JMA) that were measured by 9 different stations across Canada. These 9 stations have the data dating back to around 1983 or 1986, so I used their datasats.

Looking at the JMA database and plotting the stations with longer term recording, we have the following chart:

Le réchauffement climatique d’origine anthropique

by G. Geuskens, 14 février 2019, in ScienceClimatEnergie


Le climat peut changer, comme il l’a toujours fait et continuera à le faire sous l’action de variables naturelles. Les activités humaines peuvent-elles avoir une influence comme le prétend la théorie du réchauffement climatique d’origine anthropique ? Cette théorie est basée sur l’existence d’un hypothétique effet de serre défini comme un phénomène radiatifcausé par des gaz tels la vapeur d’eau ou le CO2 qui absorbent une fraction du rayonnement infrarouge émis par la Terre et le réémettent  ensuite dans toutes  les directions et notamment vers la surface terrestre dont la température serait, de ce fait, plus élevée qu’en l’absence de gaz absorbant l’infrarouge. L’effet de serre résulterait donc essentiellement de l’émission par les molécules de CO2 d’un rayonnement  de fluorescence  dans le domaine infrarouge [1]. Cette définition est claire et scientifiquement valable car conforme au principe de réfutabilité défini par Karl Popper. Nous l’examinerons à la lumière de théories physiques bien établies et de faits expérimentaux connus.

1. Le CO2 dans les basses couches atmosphériques

Solar Cycle 24 Going Down As Quietest In Almost 200 Years, May Put The Brakes On Warming

by Von Frank Bosse & F. Vahrenholt, January 30, 2019 in WUWT


Our sun was also very sub-normally active in December last year. We are writing the 121st month since the beginning of cycle number 24, in December 2008, and since 2012 (when we started the blog here) we could only reformulate the opening sentence once: In September 2017 when the sun was 13% more active than the long-term (since 1755) average.

All other months were below average. With the sunspot number (SSN) of 3.1 for the monthly average for December and a total of 24 days without any spot (throughout the second half of the month the sun was spotless) we are in the middle of the cycle minimum.

Fig. 2: The sunspot activity of our sun since cycle 1 (1755). The numbers are calculated by adding the monthly differences with respect to the mean (blue in Fig.1) up to the current cycle month 121.

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Ocean Warming in Climate Models Varies Far More than Recent Study Suggests

by Roy Spencer, January 17, 2019 in GlobalWarming


I wanted to expand upon something that was mentioned in yesterday’s blog post about the recent Cheng et al. paper which was widely reported with headlines suggesting a newer estimate of the rate of ocean warming is 40% higher than old estimates from the IPCC AR5 report in 2013. I demonstrated that the new dataset was only only 11% warmer when compared to the AR5 best estimate of ocean warming during 1971-2010.

The point I want to reemphasize today is the huge range in ocean warming between the 33 models included in that study. Here’s a plot based upon data from Cheng’s website which, for the period in question (1971-2010) shows a factor of 8 range between the model with the least ocean warming and the model with the most warming, based upon linear trends fitted to the model curves:

Yearly ocean heat content (OHC) changes since 1971 in 33 models versus the recent Cheng reanalysis of XBT and Argo ocean temperature data for the surface to 2,000m layer. The vertical scale is in both ZettaJoules (10^21 Joules) and in deg. C (assuming an ocean area of 3.6 x 10^14 m^2). The Cheng et al. confidence interval has been inflated by 1.43 to account for the difference between the surface area of the Earth (Cheng et al. usage) and the actual ocean surface area.

New Paper: PETM Was Caused by Climate Change… Ancient Climate Change Caused Climate Change… AEUHHH????

by David Middleton, January 23, 2019 in WUWT


Note how the PETM (55 Ma) is about as far from a CO2 analog to modern times as it possibly could be… unless the PETM stomata data are correct, in which case AGW is even more insignificant than previously thought.

Regarding temperatures, the PETM is also about as far from being an analog to modern times as it possibly could be.

 

Figure 2.  High latitude SST (°C) From benthic foram δ18O.  Funny how the PETM is often cited as a nightmarish version of a real-world RCP8.5… While the warmer EECO is a climatic optimum. (Zachos et al., 2001). Note: Older is to the right.

 

 

 

Is ocean warming accelerating faster than thought? In a word, no.

by Nic Lewis, January 22, 2019 in WUWT


There are a number of statements in Cheng et al. (2019) ‘How fast are the oceans warming’, (‘the paper’) that appear to be mistaken and/or potentially misleading. My analysis of these issues is followed by a reply from the paper’s authors.

Contrary to what the paper indicates:

  • Contemporary estimates of the trend in 0–2000 m depth ocean heat content over 1971–2010 are closely in line with that assessed in the IPCC AR5 report five years ago

  • Contemporary estimates of the trend in 0–2000 m depth ocean heat content over 2005–2017 are significantly (> 95% probability) smaller than the mean CMIP5 model simulation trend.

Study Claiming Insect Decline Due To Global Warming Is Based On Faulty Temperature Data.

by P. Homewood, January 20, 2019 in NotaLotofPeople KnowThat


Clearly the whole study is worthless, and the paper should be withdrawn.

There are some alarming facts about all of this:

1) Why did the researchers not suspect that the temperature data looked hopelessly wrong at the outset?

2) Why did peer review not do the basic checks that I did?

3) The study carries out some mindbendingly complex statistical analysis, linking arthropod decline to rising temperatures. But how can this analysis have been robust, when the temperature data was hopelessly wrong?

The conclusion is that the faulty temperature data matched the researchers’ expectations of climate warming, and consequently they never bothered to crosscheck. It would after all have been extremely simple to have asked the people who maintain the data.

Whether or not arthropods are in decline I have no idea. But by blaming non existent climate warming, there is a very real danger that the true cause is being missed. Indeed, looking at those graphs, it may well be climate cooling that is responsible.

I plan to contact PNAS, who published the paper, to request that it be withdrawn.

Media Reports of +40% Adjustment in Ocean Warming Were Greatly Exaggerated

by Roy W. Spencer, Ph. D., January 16, 2019


Summary:The recently reported upward adjustment in the 1971-2010 Ocean Heat Content (OHC) increase compared to the last official estimate from the IPCC is actually 11%, not 40%. The 40% increase turns out to be relative to the average of various OHC estimates the IPCC addressed in their 2013 report, most of which were rejected. Curiously, the new estimate is almost identical to the average of 33 CMIP climate models, yet the models themselves range over a factor of 8 in their rates of ocean warming. Also curious is the warmth-enhancing nature of temperature adjustments over the years from surface thermometers, radiosondes, satellites, and now ocean heat content, with virtually all data adjustments leading to more warming rather than less.

See also here

MATH ERROR: Scientists Admit ‘Mistakes’ Led To Alarming Results In Major Global Warming Study

by M. Bastasch, November 14, 2018 in WUWT/DailyCaller


  • Scientists behind a headline-grabbing climate study admitted they “really muffed” their paper.

  • Their study claimed to find 60 percent more warming in the oceans, but that was based on math errors.

  • The errors were initially spotted by scientist Nic Lewis, who called them “serious (but surely inadvertent) errors.”

The scientists behind a headline-grabbing global warming study did something that seems all too rare these days — they admitted to making mistakes and thanked the researcher, a global warming skeptic, who pointed them out.

“When we were confronted with his insight it became immediately clear there was an issue there,” study co-author Ralph Keeling told The San Diego Union-Tribune on Tuesday.

Their study, published in October, used a new method of measuring ocean heat uptake and found the oceans had absorbed 60 more heat than previously thought. Many news outlets relayed the findings, but independent scientist Nic Lewis quickly found problems with the study.

Keeling, a scientist at the Scripps Institution of Oceanography, owned up to the mistake and thanked Lewis for finding it. Keeling and his co-authors submitted a correction to the journal Nature. (RELATED: Headline-Grabbing Global Warming Study Suffers From A Major Math Error)

Why CO2 Is Not A Climate Control Knob

by A. Bright-Paul, October 22, 2018 in ClimateChageDispatch


As the Earth rotates on its own axis, one-half of the Earth is cooling while the other half is warming up.

So the Earth is warming and cooling daily and the temperature is changing 3,600 times every hour in every location all over the world, as there are 3,600 seconds in every hour.

As the Earth is traveling around the Sun in an ellipse at 66,000 miles per hour and is tilted and wobbling as it spins, so the Earth has seasons, as the angle to the Sun varies.

So the temperatures in the spring and summer are usually warmer than in the autumn and winter when temperatures decline.

So there is a massive number of different temperatures over the whole Earth, constantly changing and always in flux.

Wide-scale US wind power could cause significant warming

by James Temple, October 4, 2018 in MITTechnologyReview


Wind power is booming in the United States.

It’s expanded 35-fold since 2000 and now provides 8% of the nation’s electricity. The US Department of Energy expects wind turbine capacity to more than quadruple again by 2050.

But a new study by a pair of Harvard researchers finds that a high amount of wind power could mean more climate warming, at least regionally and in the immediate decades ahead. The paper raises serious questions about just how much the United States or other nations should look to wind power to clean up electricity systems.

Highlights

  • Wind power reduces emissions while causing climatic impacts such as warmer temperatures
  • Warming effect strongest at night when temperatures increase with height
  • Nighttime warming effect observed at 28 operational US wind farms
  • Wind’s warming can exceed avoided warming from reduced emissions for a century