Archives de catégorie : climate-debate

Abrupt summer sea ice decline has not affected polar bear numbers as predicted

by  Dr. Susan J. Crockford, July 14, 2017 in ClimateChangeDispatch

Yes, Arctic sea ice has declined since satellite records began in 1979 but polar bears have adjusted well to this change, especially to the abrupt decline to low summer sea ice levels that have been the norm since 2007. Some polar bear subpopulations have indeed spent more time on land in summer than in previous decades but this had little negative impact on health or survival and while polar bear attacks on humans appear to have increased in recent years (Wilder et al. 2017), the reasons for this are not clear: reduced summer sea ice is almost certainly not the causal factor (see previous post here).

Temperature and Forcing

by Willis Eschenbach, July 13, 2017 in WUWT

Over at Dr. Curry’s excellent website, she’s discussing the Red and Blue Team approach. If I ran the zoo and could re-examine the climate question, I’d want to look at what I see as the central misunderstanding in the current theory of climate.

This is the mistaken idea that changes in global temperature are a linear function of changes in the top-of-atmosphere (TOA) radiation balance (usually called “forcing”).

Media gets high on Antarctic Crack

by Anthony Watts, July 13, 2017 in WUWT

I thought I’d take a moment from my R&R to write about all the hullabaloo surrounding the calving of the large iceberg off the Larsen C ice shelf in Antarctica. First, a few of the headlines:

LA Times: After Antarctica sheds a trillion-ton block of ice, the world asks: Now what?

The Grauniad: Iceberg twice size of Luxembourg breaks off Antarctic ice shelf

NYT: Warnings from Antarctica


from Global Warming Policy Forum, July 12, 2017

A new opinion poll of 10,000 European citizens reveals majority of Europeans reject the claim that climate change is mainly or entirely caused by humans.

For the last few decades, questions about the causes and impacts of climate change have dominated the climate debate. The IPCC and many climate scientists have been claiming relentlessly that the global warming trend since the second half of the 20th century is mainly if not entirely man-made, i.e. as a result of anthropogenic greenhouse gas emissions. This dogma is habitually claimed to be the global climate consensus.

The Holocene context for Anthropogenic Global warming

by Ed Hoskins, June1, 2015

When considering the scale of temperature changes that alarmists anticipate because of Man-made Global Warming and their view of the disastrous effects of additional Man-made Carbon Dioxide emissions in this century, it is useful to look at climate change from a longer term, century by century and even on a millennial perspective.

(i) See also here

(ii) See also here

Three New Papers: Greenland 3-5°C Warmer With 40 Kilometers Less Ice Area 4,000-10,000 Years Ago

by Kenneth Richard, July 11, in ClimateChangeDispatch

It’s official. According to a new paper published in the journal Scientific Reports, Greenland has been cooling slightly since 2005.

This trend development may be a harbinger of what may be in store for the coming years.  Shifts in North Atlantic temperatures typically lead changes in the Arctic by a few years.  And throughout the North Atlantic, rapid cooling has been underway since 2005, plunging below the levels reached in the 1950s

Tangier Island

by Paul Homewood, July 10, 2017

CBS have a report on rising sea levels at Tangier Island, in Chesapeake Bay here

The video is worth watching. The CBS reporter makes the usual attempts to blame it on “climate change”, but the locals know too much to fall for that old pony.
They know that sea levels have been rising, and land eroding, since 1850.

And they are right. Tide gauges in the area, such Sewell Point, Norfolk, confirm that sea levels have been steadily rising for a long time, long before recent rises in emissions of CO2.


by Vencore Weather, July 4, 2017

Much of Greenland has been colder-than-normal for the year so far and has had record or near record levels of accumulated snow and ice since the fall of last year. The first week of this month was especially brutal in Greenland resulting in the record low July temperature and it also contributed to an uptick in snow and ice extent – despite the fact that it is now well into their summer season.

Does a new paper really reconcile instrumental and model-based climate sensitivity estimates

by Nic Lewis, July 8, 2017 in Climate Audit

A new paper in Science Advances by Cristian Proistosescu and Peter Huybers “Slow climate mode reconciles historical and model-based estimates of climate sensitivity” (hereafter PH17) claims that accounting for the decline in feedback strength over time that occurs in most CMIP5 coupled global climate models (GCMs), brings observationally-based climate sensitivity estimates from historical records into line with model-derived estimates. It is not the first paper to attempt to do so, but it makes a rather bold claim and, partly because Science Advances seeks press coverage for its articles, has been attracting considerable attention.

Methane Emissions: from blind spot to spotlight

by The Oxford Institute for Energy Studies, July 2017

Very comprehensive file, 39 pages .pdf

Methane emissions influence but do not undermine the environmental case for gas. If the industry can build on the progress to date and deliver a clearer picture on the level of emissions and actions to address them, the arguments for gas displacing coal in power generation and oil products in transport become much stronger.

Responsiveness of Atmospheric CO2 to Fossil Fuel Emissions: Updated

by Jamal Munshi, July 5, 2017 in SSRN

The IPCC carbon budget concludes that changes in atmospheric CO2 are driven by fossil fuel emissions on a year by year basis. A testable implication of the validity of this carbon budget is that changes in atmospheric CO2 should be correlated with fossil fuel emissions at an annual time scale net of long term trends. A test of this relationship with insitu CO2 data from Mauna Loa 1958-2016 and flask CO2 data from twenty three stations around the world 1967-2015 is presented. The test fails to show that annual changes in atmospheric CO2 levels can be attributed to annual emissions.


Bombshell study: Temperature Adjustments Account For ‘Nearly All Of The Warming’ In Government Climate Data

by Michael Bastasch, July 6, 2017, in WUWT

A new study found adjustments made to global surface temperature readings by scientists in recent years “are totally inconsistent with published and credible U.S. and other temperature data.”

“Thus, it is impossible to conclude from the three published GAST data sets that recent years have been the warmest ever – despite current claims of record setting warming,” according to a study published June 27 by two scientists and a veteran statistician.

Despite Paris accord, G-20 countries invest four times as much in fossil fuels as green energy

by Ben Wolfgang, July 5, 2017,  in The Washington Times

The biggest critics of President Trump’s decision to withdraw from the Paris climate accord are also the world’s biggest hypocrites on energy policy, top environmental groups charged Wednesday in a report that found many top nations’ rhetoric on cutting emissions doesn’t line up with how and where they spend their money.

The key finding: The G-20 nations spend roughly four times as much in public financing for fossil fuels as they do supporting renewable energy sources such as wind and solar. The report examines loans, grants, guarantees, insurance and other types of public finance offered either by the governments, government-owned financial institutions and credit agencies, and multilateral groups made up of G-20 countries.

On Sunday, Goulburn got colder than the BOM thought was possible (and a raw data record was “adjusted”)

by JoNova, July 2017

The BOM got caught this week auto-adjusting cold extremes to be less cold. Lance Pidgeon of the unofficial BOM audit team noticed that the thermometer at Goulburn airport recorded – 10.4°C at 6.17am on Sunday morning, but the official BOM climate records said it was -10.0°C. (What’s the point of that decimal place?) Either way this was a new record for Goulburn in July. (The previous  coldest ever July morning was -9.1°C. The oldest day in Goulburn was in August 1994 when it reached -10.9°C).

Coal Boom: 1600 new plants in 62 countries around the world – increasing 43%

by JoNova, July 2017

“End-Coal” Global Coal Tracker  does a magnificent job of showing how essential coal is around the world, and which countries are pathetically backwards in developing new coal plants. It’s probably not what the “CoalSwarm” team was hoping to achieve, but this map is a real asset to those of us who want to show how tiny Australia’s coal fired assets are compared to the rest of the world

Skillful prediction of northern climate provided by the ocean

by M. Arthur et al., June 20, 2017, in Nature Communication

We show that variations in ocean temperature in the high latitude North Atlantic and Nordic Seas are reflected in the climate of northwestern Europe and in winter Arctic sea ice extent. Statistical regression models show that a significant part of northern climate variability thus can be skillfully predicted up to a decade in advance based on the state of the ocean. Particularly, we predict that Norwegian air temperature will decrease over the coming years, although staying above the long-term (1981–2010) average. Winter Arctic sea ice extent will remain low but with a general increase towards 2020.

Pronounced differences between observed and CMIP5-simulated multidecadal climate variability in the twentieth century

by Sergey Kravtsov, June 15, 2017

The observed internal variability so estimated exhibits a pronounced multidecadal mode with a distinctive spatiotemporal signature, which is altogether absent in model simulations. This single mode explains a major fraction of model-data differences over the entire climate index network considered; it may reflect either biases in the models’ forced response or models’ lack of requisite internal dynamics, or a combination of both.