by P. Gosselin, April 2, 2019 in NoTricksZone
A number of scientists from the alarmist camp like to insist that there had never been such a hiatus. The latest paper contradicts that claim.
The new study states that many published analyses show that lightning activity is responsive to temperature on time scales ranging from the diurnal to the decadal and that the hiatus in global warming earlier this century can be seen in several global datasets.
Scientists found that the statistically flat behavior of the global lightning record from the NASA Lightning Imaging Sensor over the same decadal period is consistent with this hiatus in global warming.
What follows is the paper’s abstract:
Multiple records of global temperature contain periods of decadal length with flat or declining temperature trend, often termed a ‘hiatus’. Towards assessing the physical reality of two such periods (1940–1972 and 1998–2014), lightning data are examined. Lightning activity is of particular interest because on many different time scales it has been shown to be non-linearly dependent on temperature. During the earlier hiatus, declining trends in regional thunder days have been documented. During the more recent hiatus, lightning observations from the Lightning Imaging Sensor in space show no trend in flash rate. Surface-based, radiosonde-based and satellite-based estimates of global temperature have all been examined to support the veracity of the hiatus in global warming over the time interval of the satellite-based lightning record. Future measurements are needed to capture the total global lightning activity on a continuous basis.”
by K. Richard, March 28, 2019 in NoTricksZone
An unheralded but significant 2016 scientific paper – “A Hiatus of the Greenhouse Effect” – is now publicly available.
Scientists have found the greenhouse effect’s (GHE) influence on planetary temperatures went on “hiatus” during 1992-2014.
The estimated GHE radiative influence for these 22 years was a slightly negative -0.04 Wm-2 per year.
The reason why the GHE influence went on hiatus in recent decades is that (a) decadal-scale changes in cloud cover exert dominant radiative control in longwave forcing (GHE) efficacy, and (b) the shortwave effects of cloud cover changes override the radiative longwave effects, meaning that a decrease in cloud cover will allow more direct shortwave radiation to be absorbed by the Earth system, eliciting a net positive imbalance in the energy budget.
by P. Gosselin , February 19, 2019 in NoTricksZone
Readers should note that among climate modelers volcanoes and atmospheric aerosols have been a favorite way of fudging climate models to explain away inconvenient cooling periods that weren’t supposed to happen in a system that is supposed to be dominated by trace gas CO2.
Extratropical volcanoes influence climate more than assumed
Study shows surprisingly strong cooling after volcanic eruptions in mid and high latitudes
by Christopher Monckton of Brenchley, January 10, 2019 in WUWT
The prolonged el Niño of 2016-2017, not followed by a la Niña, has put paid to the great Pause of 18 years 9 months in global warming that gave us all such entertainment while it lasted. However, as this annual review of global temperature change will show, the credibility gap between predicted and observed warming remains wide, even after some increasingly desperate and more or less openly prejudiced ever-upward revisions of recent temperatures and ever-downward depressions in the temperatures of the early 20th century in most datasets with the effect of increasing the apparent rate of global warming. For the Pause continues to exert its influence by keeping down the long-run rate of global warming.
by David Whitehouse, December 20, 2018 in GWPF
Using simple statistics it looked at and dismissed over 200 peer-reviewed papers that analysed the pause and concluded it was a real phenomenon. How did they, and the IPCC, get it all so wrong?
Source: Clive Best
Nobody who keeps an eye on climate research will be at all surprised by this “new” paper. Its conclusions were well aired in April 2018 at a meeting of the European Geophysical Union.
The authors must have been rather frustrated at the time as the paper describing their work had been submitted to the journal Environmental Research Letters over a year earlier, in February 2017 in fact, still had not been published. This was remedied a few days ago when it was finally published — one year and nine months after its submission!
by M. Ding et al., August 27, 2018 in CO2Science
The results of their analysis revealed that warming in this high Arctic site had proceeded at four times the global mean rate calculated in other data sets. However, Ding et al. note that over the last decade (2005-2014), “the warming rate in Ny-Ålesund slowed to 0.03 ± 1.85°C per decade,” which is essentially indicative of no-trend in the data. Lead-lag analysis further revealed that “Ny-Ålesund and global temperature variations were remarkably consistent, with a lag time of 8-9 years.” Consequently, the researchers say that “the ‘warming hiatus’ many scientists [have] studied also appears in Ny-Ålesund, it just started later than [that observed in] other areas.”
by Sun X. et al., 2018 in CO2Science
Sun, X., Ren, G., Ren, Y., Fang, Y., Liu, Y., Xue, X. and Zhang, P. 2018. A remarkable climate warming hiatus over northeast China since 1998. Theoretical and Applied Climatology 133: 579-594.
A prominent feature of all climate model projections is their prediction that temperatures should be rising in response to ever-increasing concentrations of greenhouse gases. However, for the past two decades global surface air temperatures have not warmed to the degree predicted by the models, which lack of warming has been a conundrum to the climate alarmist movement.
by Anthony Watts, July 18, 2018 in WUWT
In response to a study from the University of Washington posted on WUWT (and elsewhere) today about a shift in the AMOC and a very clear statement about it not collapsing (as posited for collapse by many), including Michael Mann, Dr. Judith Curry gave this response to the Daily Caller’s Mike Bastasch: …
by Grégoire Canlorbe, June 18, 2018 in WUWT
Richard Siegmund Lindzen is an American atmospheric physicist known for his work in the dynamics of the atmosphere, atmospheric tides, and ozone photochemistry. He has published more than 200 scientific papers and books. From 1983 until his retirement in 2013, he was Alfred P. Sloan Professor of Meteorology at the Massachusetts Institute of Technology. He was a lead author of Chapter 7, “Physical Climate Processes and Feedbacks,” of the Intergovernmental Panel on Climate Change’s Third Assessment Report on climate change. He has criticized the scientific consensus about climate change and what he has called “climate alarmism.”
by Anthony Watts, June 10, 2018 i
On June 8th, the California Department of Forestry and Fire Protection (Cal Fire) made its first official announcement via press release that 12 big Northern California wildfires in October 2017 were caused by problems associated with electric utility power lines.
The October 2017 Fire Siege involved more than 170 fires and burned at least 245,000 acres in Northern California. About 11,000 firefighters from 17 states and Australia helped battle the blazes. They concluded that 12 Wildfires in Mendocino, Humboldt, Butte, Sonoma, Lake, and Napa Counties were caused by Pacific Gas & Electric (PG&E) “power and distribution lines, conductors and the failure of power poles.”
The words “global warming” and “climate change” were conspicuously absent from the announcement even…
by Anthony Watts, June 7, 2018 in WUWT
More excuses for “the pause”.
A team of researchers from the U.K. Met Office, Sweden and Australia has found that three periods of global warming slowdown since 1891 were likely due to natural causes rather than disruptions to the factors causing global warming. In their paper published on the open access site Science Advances, the group describes their study of global mean surface temperatures (GMST) since the late 19th century and what they found.
In this new paper, the researchers looked at GMST as registered by multiple sources around the globe over the past 127 years, noting the slow march of temperature increases. More specifically, they noted the three previously identified slowdowns in GMST increases—the time periods from 1896 to 1910, from 1941 to 1975, and then from 1998 to 2013. They then looked at factors that could have contributed to these slowdowns and found natural causes for each. (…)
by Ron Clutz, May 16, 2018 in ScienceMatters
Thanks to GWPF for publishing posthumously Bill Gray’s understanding of global warming/climate change. The paper was compiled at his request, completed and now available as Flaws in applying greenhouse warming to Climate Variability This post provides some excerpts in italics with my bolds and some headers. Readers will learn much from the entire document (title above is link to pdf).
The Fundamental Correction
The critical argument that is made by many in the global climate modeling (GCM) community is that an increase in CO2 warming leads to an increase in atmospheric water vapor, resulting in more warming from the absorption of outgoing infrared radiation (IR) by the water vapor (…)
Figure 14: Global surface temperature change since 1880. The dotted blue and dotted red lines illustrate how much error one would have made by extrapolating a multi-decadal cooling or warming trend beyond a typical 25-35 year period. Note the recent 1975-2000 warming trend has not continued, and the global temperature remained relatively constant until 2014.
by K. Richard, May 10, 2018 in NoTricksZone
During 2017, there were 150 graphs from 122 scientific papers published in peer-reviewed journals indicating modern temperatures are not unprecedented, unusual, or hockey-stick-shaped — nor do they fall outside the range of natural variability. We are a little over 4 months into the new publication year and already 81 graphs from 62 scientific papers undermine claims that modern era warming is climatically unusual.
by Ron Clutz, May 8, 2018 in ScienceMatters
Years ago, Dr. Roger Pielke Sr. explained why sea surface temperatures (SST) were the best indicator of heat content gained or lost from earth’s climate system. Enthalpy is the thermodynamic term for total heat content in a system, and humidity differences in air parcels affect enthalpy. Measuring water temperature directly avoids distorted impressions from air measurements. In addition, ocean covers 71% of the planet surface and thus dominates surface temperature estimates.
More recently, Dr. Ole Humlum reported from his research that air temperatures lag 2-3 months behind changes in SST. He also observed that changes in CO2 atmospheric concentrations lag behind SST by 11-12 months. This latter point is addressed in a previous post Who to Blame for Rising CO2?