With the help of satellite observations from 188 lakes worldwide, scientists have shown that the warming of large lakes amplifies their color. Lakes which are green due to their high phytoplankton content tend to become greener in warm years as phytoplankton content increases. Clear, blue lakes with little phytoplankton, on the other hand, tend to become even bluer in warm years caused by declines in phytoplankton. Thus, contrary to previous assumptions, the warming of lakes tends to amplify their richness or poverty of phytoplankton.
Results indicate climate models where the initiation of glaciation depends strongly on CO2concentrations over astronomical controls significantly overpredict the duration of the present-day warm period compared to past interglacial analogs.
(…) Upon our return to the Hotel after visiting the Glacier, we noticed that our brand-new photos appear to show that the Grinnell Glacier has grown slightly from the 2008 images that are displayed on the Hotel walls. There has been no reporting of this in any newspaper or broadcast that we know of. (In fact, all news coverage reports the precise opposite.) The smaller Gem Glacier—which is visible from the valley miles below—also appears to be slightly larger than it is shown in 2008 pictures on display.
by Sebastien Laye, September 18, 2017 in NotaLotofPeopleKnowThat
Those voices are the impetus behind what Subramanian calls a “green and clean coal coalition” spanning both the developed and developing worlds. Emerging markets in Asia and Africa will continue to build new coal-fired power stations for at least the next two decades. In that timeframe, coal-fired solutions are indispensable to meeting their demands for electrification and growth. As clean coal solutions emerge, new plants in the developing world can and should be far cleaner than previous generations of coal-fired plants in Europe and America.
The study is published in the journal Nature Geoscience by a team of scientists led by Richard Millar of the University of Oxford. It has recalculated the carbon budget for limiting the Earth’s warming to 1.5 degrees Celsius above temperatures seen in the late 19th century. It had been widely assumed that this stringent target would prove unachievable, but the new study would appear to give us much more time to act if we want to stay below it.
by Arthur Viterio, 2016, in J Earth Science Climate Change
Earth’s climate is a remarkably “noisy” system, driven by scores of oscillators, feedback mechanisms, and radiative forcings. Amidst all this noise, identifying a solitary input to the system (i.e., HGFA MAG4/6 seismic activity as a proxy for geothermal heat flux) that explains 62% of the variation in the earth’s surface temperature is a significant finding.
by Cédric Moro, 18 septembre 2017 in Mythes,Mancies&Mathématiques
Que n’a-t-on pas entendu dans une partie de la presse et dans les déclarations à chaud de scientifiques et d’experts du climat sur l’uragan Irma. C’était du jamais vu, du jamais mesuré, d’une puissance inégalée, Europe 1 allant jusqu’à parler « du plus important de l’histoire climatologique ». Des eaux extraordinairement chaudes devaient expliquer son intensité effroyable (sous-entendu : Irma, c’est la faute au réchauffement), ses vents destructeurs records, son diamètre exceptionnel, ses pluies diluviennes, son raz de marée démesuré, son intensification inouïe ou ses dégâts hors normes…
by Javier, September 15, 2017, in Judith Curry Climate Etc.
The existence of a 1500-year climatic cycle during the Holocene, related to the glacial Dansgaard-Oeschger cycle, is a matter of intense debate. However, by introducing precise timing requirements it can be shown that the 1500-year cycle displayed in Northern Hemisphere glacial records is also observed in Holocene records from all over the world.
The cycle is most prominently displayed in oceanic subsurface water temperatures, Arctic atmospheric circulation, wind deposits, Arctic drift ice, and storminess records.
Climate Change: The Facts 2017 contains 22 essays by internationally-renowned experts and commentators, including Dr Bjorn Lomborg, Dr Matt Ridley, Professor Peter Ridd, Dr Willie Soon, Dr Ian Plimer, Dr Roy Spencer, and literary giant Clive James. Anthony Watts also has a chapter.
The volume is edited by Dr Jennifer Marohasy, Senior Fellow at the Institute of Public Affairs. Fourteen of the contributors currently hold or have held positions at a university or a scientific research organisation.
Zerbini et al. also investigated/tested for the existence of an acceleration of sea level rise in each of the six Mediterranean station’s data, reporting that “our analysis indicates that it is not possible to reliably state the existence of any acceleration, in the area of this study, considering the past 140 years or so, from 1870 through 2012.”
The record-setting twelve-year long hurricane “drought” (no major hurricane landfalls on the US) was just weather. But the Left immediately boldly and confidently declared Harvey and Irma to be caused (or worsened) by anthropogenic climate change. Some of these screeds are mostly rational, just exaggerated or imbalanced.
by Anastasios Tsonis, September 15, 2017 in GWPF Report26 (.pdf)
This report describes this phenomenon and brings it into a modern global con- text. But the story is more than simply one of some old South American geophysical phenomenology seen from a global perspective; it is tied to an extraordinary story about new scienti c thinking, arising at the end of the 20th century, concerning the nature of change itself.
The discovery of volcanoes under the Antarctic ice sheet may be old news, but now we have evidence that at least some of them have recently (geologically speaking) erupted…
I have written about sea level rise here: here, here, here, here and here. The previous essays are not prerequisites but are interesting specific examples.
There are two important points which readers must be aware of from the first mention of SLR:
SLR is a real imminent threat to coastal cities and low-lying coastal and near-coastal densely-populated areas.
SLR is not a threat to anything else — not now, not in a hundred years — probably not in a thousand years — maybe, not ever.
by Paul Homewood, September 1, 2017 in NotaLotofPeopleKnowThat
Since 1851, there have been 14 stronger hurricanes at landfall, and Irma ties with 10 others. In other words, Irma is one of 25 hurricanes as strong or stronger.
Le cyclone Irma qui a dévasté Saint-Martin et Saint-Barthélémy dans les Antilles françaises a servi de prétexte à de nombreux commentateurs et journalistes pour en remettre une couche sur les “dérèglements climatiques d’origine humaine”. Comme d’habitude, les vagues éléments de prudence rappelant qu’on ne peut tirer de conclusions d’un élément isolé ont vite été noyés par les “appels à l’action” et l’invocation de l’Accord de Paris de 2015.
Or s’agissant du climat aux Antilles l’année 2015 a été importante pour une toute autre raison que la signature de l’Accord de Paris : c’est l’année de publication d’un article de recherche tout à fait passionnant sur les ouragans dans cette région du monde.
This modern rate – just 0.17-0.18 of a meter per century –has remained relatively unchanged from the overall 20th century average, and there has been no statistically significant acceleration in the sea level rise rate (just 0.0042 mm/yr-²) since 1900.
by Paul Homewood, September 7, 2017 in ClimateChangeDispatch
(…)
In other words, there have now been four hurricanes as strong or stronger since 1980, about one every decade, and certainly nothing like the “unprecedented” impression left by the headlines.
And as we know, prior to Allen in 1980, we had very little in the way of measurements in mid-ocean.
A closer look at the Labor Day Hurricane of 1935, widely acknowledged to be by far the most powerful storm to hit the US, emphasizes this fact.
Don’t hold your breath: Even the best meteorologists in the world weren’t able to predict the development and track of Hurricane Harvey until a few days before it hit. (…)
Weather and climate analyst Schneefan here writes of “early frost” in the Arctic and how Greenland snow and ice have grown after being hit by a “snow bomb”. This contradicts the expectations of global warming alarmists.
The polar summer this year appears to have ended prematurely. The mean temperature of the central Arctic above 80°N has remained under the long-term average over the entire summer and even dipped below the freezing point about a week earlier than normal (1958-2002 mean).
Il se produit en moyenne 300 catastrophes naturelles par an, soit presque une par jour ; nous en sommes informés en temps réel et la responsabilité du réchauffement est presque systématiquement invoquée. Il se diffuse ainsi dans l’opinion l’idée d’un dérèglement climatique qui irait en s’accentuant sous l’effet du réchauffement. Les différentes sources de données exploitées dans cet article sont convergentes : il n’y a pas d’augmentation de la fréquence , de l’intensité et de la durée des événements extrêmes depuis le début de l’ère industrielle, qu’il s’agisse des cyclones et des tempêtes, des inondations, des sécheresses et des vagues de chaleur . Cela est d’ailleurs admis par le GIEC dans son rapport spécial sur les événements extrêmes de 2012, et dans son 5ème rapport d’évaluation de 2013.
