Blog Profile / RealClimate


URL :http://www.realclimate.org/
Filed Under:Issues & Causes / Climate Change
Posts on Regator:295
Posts / Week:0.9
Archived Since:November 10, 2008

Blog Post Archive

The global temperature jigsaw

Since 1998 the global temperature has risen more slowly than before. Given the many explanations for colder temperatures discussed in the media and scientific literature (La Niña, heat uptake of the oceans, arctic data gap, etc.) one could jokingly ask why no new ice age is here yet. This fails to recognize, however, that the [...]

AGU 2013 preview and participation

So, it’s that time of year again. Fall AGU is the largest Earth Science conference on the planet, and is where you will get previews of new science results, get a sense of what other experts think about current topics, and indulge in the more social side of being a scientist. The full scientific program [...]

A failure in communicating the impact of new findings

I was disappointed by the recent summary for policymakers (SPM) of the intergovernmental panel on climate change (IPCC) assessment report 5, now that I finally got around to read it. Not so much because of the science, but because the way it presented the science. The report was written by top scientists, so what went [...]

Unforced Variations: Dec 2013

This month’s open thread. It’s coming to the end of the year and that means updates to the annual time series of observations and models relatively soon. Suggestions for what you’d like to see assessed are welcome… or any other climate science related topic.

Arctic and American Methane in Context

Lots of interesting methane papers this week. In Nature Geoscience, have published a substantial new study of the methane cycle on the Siberian continental margin of the Arctic Ocean. This paper will get a lot of attention, because it follows by a few months a paper from last summer,, which claimed a strong (and [...]

Sea-level rise: What the experts expect

In the long run, sea-level rise will be one of the most serious consequences of global warming. But how fast will sea levels rise? Model simulations are still associated with considerable uncertainty – too complex and varied are the processes that contribute to the increase. A just-published survey of 90 sea-level experts from 18 countries [...]

Statistics and Climate

Do different climate models give different results? And if so, why? The answer to these questions will increase our understanding of the climate models, and potentially the physical phenomena and processes present in the climate system. We now have many different climate models, many different methods, and get a range of different results. They provide [...]

Global Warming Since 1997 Underestimated by Half

A new study by British and Canadian researchers shows that the global temperature rise of the past 15 years has been greatly underestimated. The reason is the data gaps in the weather station network, especially in the Arctic. If you fill these data gaps using satellite measurements, the warming trend is more than doubled in [...]

Simple physics and climate

No doubt, our climate system is complex and messy. Still, we can sometimes make some inferences about it based on well-known physical principles. Indeed, the beauty of physics is that a complex systems can be reduced into simple terms that can be quantified, and the essential aspects understood. A recent paper by provides an example [...]

Cows, Carbon and the Anthropocene: Commentary on Savory TED Video

Guest post by Jason West and David Briske Allan Savory delivered a highly publicized talk at a “Technology, Entertainment, Design (TED)” conference in February of this year (2013) entitled “How to fight desertification and reverse climate change.” Here we address one of the most dramatic claims made – that a specialized grazing method alone can [...]

From global climate change to local consequences

Some will be luckier than others when it comes to climate change. The effects of a climate change on me will depend on where I live. In some regions, changes may not be as noticeable as in others. So what are the impacts in my region? In other understand the local impacts of a climate [...]

A new European report on climate extremes is out

A new report on extreme climate events in Europe is just published: ‘Extreme Weather Events in Europe: preparing for climate change adaptation‘. It was launched in Oslo on October 24th by the Norwegian Academy of Science and Letters, and the report is now available online. What’s new? The new report provides information that is more [...]

Sea level in the 5th IPCC report

What is happening to sea levels? That was perhaps the most controversial issue in the 4th IPCC report of 2007. The new report of the Intergovernmental Panel on Climate Change is out now, and here I will discuss what IPCC has to say about sea-level rise (as I did here after the 4th report). Let [...]

Science of Climate Change online class starting next week on Coursera

Maybe you remember the rollout a few years ago of Open Climate 101, a massive open online class (MOOC) that was served sort of free-range from a computer at the University of Chicago. Now the class has been entirely redone as Global Warming: The Science of Climate Change within the far slicker Coursera platform. Beginning [...]

The IPCC AR5 attribution statement

Last year I discussed the basis of the AR4 attribution statement: Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations. In the new AR5 SPM (pdf), there is an analogous statement: It is extremely likely that more than [...]

Climate Change on Film

Making a film about climate change is difficult, especially if you want it to reach a wide audience. One problem is the long time scale of climate change, which fits badly with the time scale of a typical film narrative. That was the reason why in the Hollywood blockbuster The Day After Tomorrow some laws [...]

The evolution of radiative forcing bar-charts

As part of the IPCC WG1 SPM(pdf) released last Friday, there was a subtle, but important, change in one of the key figures – the radiative forcing bar-chart (Fig. SPM.4). The concept for this figure has been a mainstay of summaries of climate change science for decades, and the evolution over time is a good [...]

Unforced Variations: Oct 2013

This month’s open thread. We’re going to guess that most of what people want to talk about is related to the IPCC WG1 AR5 report… Have at it!

The new IPCC climate report

The time has come: the new IPCC report is here! After several years of work by over 800 scientists from around the world, and after days of extensive discussion at the IPCC plenary meeting in Stockholm, the Summary for Policymakers was formally adopted at 5 o’clock this morning. Congratulations to all the colleagues who were [...]

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