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Blog Profile / RealClimate

Filed Under:Issues & Causes / Climate Change
Posts on Regator:451
Posts / Week:1.5
Archived Since:November 10, 2008

Blog Post Archive

The Greenland melt

Last July (2012), I heard from a colleagues working at the edge of the Greenland ice sheet, and from another colleague working up at the Summit. Both were independently writing to report the exceptional conditions they were witnessing. The first was that the bridge over the Watson river by the town of Kangerlussuaq, on the [...]

What to study?

I recently got an email from newly graduated Math(s) major (mildly edited): I am someone with a deep-seated desire to help the planet remain as habitable as possible in the face of the trials humanity is putting it through. I’d like to devote my career to this cause, but am young and haven’t chosen a [...]

Sea-level rise: Where we stand at the start of 2013 — Part 2

This is Part 2 of my thoughts on the state of sea-level research. Here is Part 1. Sea-level cycles? A topic that keeps coming up in the literature is the discussion on a (roughly) 60-year cycle in sea level data; a nice recent paper on this is. One thing I like about this paper [...]

Sea-level rise: Where we stand at the start of 2013

Progress has been made in recent years in understanding the observed past sea-level rise. As a result, process-based projections of future sea-level rise have become dramatically higher and are now closer to semi-empirical projections. Show More Summary

On Sensitivity Part II: Constraining Cloud Feedback without Cloud Observations

Guest Commentary by Karen M. Shell, Oregon State University Link to Part I. Clouds are very pesky for climate scientists. Due to their high spatial and temporal variability, as well as the many processes involved in cloud droplet formation, clouds are difficult to model. Furthermore, clouds have competing effects on solar and terrestrial radiation. Increases [...]

On sensitivity: Part I

Climate sensitivity is a perennial topic here, so the multiple new papers and discussions around the issue, each with different perspectives, are worth discussing. Since this can be a complicated topic, I’ll focus in this post on the credible work being published. There’ll be a second part from Karen Shell, and in a follow-on post [...]

Unforced Variations: Jan 2013

A new year… so comments reflecting the past year in climate science, or looking forward to the next are particularly apropos.

What is signal and what is noise?

The recent warming has been more pronounced in the Arctic Eurasia than in many other regions on our planet, but argues that only one out of 109 temperature records from this region exhibits a significant warming trend. I think that his conclusions were based on misguided analyses. The analysis did not sufficiently distinguish between signal [...]

A review of cosmic rays and climate: a cluttered story of little success

A number of blogs were excited after having leaked the second-order draft of IPCC document, which they interpreted as a “game-changing admission of enhanced solar forcing”. However, little evidence remains for a link between galactic cosmic rays (GCR) and variations in Earth’s cloudiness. recently provided an extensive review of the study of the GCR and [...]

The heat is on in West Antarctica

Eric Steig Regular followers of RealClimate will be aware of our publication in 2009 in Nature, showing that West Antarctica — the part of the Antarctic ice sheet that is currently contributing the most to sea level rise, and which has the potential to become unstable and contribute a lot more (3 meters!) to sea [...]

Online video lectures on climate change

For those who’d like to get the basics of climate change explained first-hand by a climate scientist, here are two video lectures. In the first, I show some of the basic data sets and findings about global warming, including some comments on historic land marks of our science. The second lecture deals with the impacts [...]

Improving the Tropical Cyclone Climate Record

Guest Commentary by Christopher Hennon (UNC) Get involved in a new citizen science project at The poor quality of the tropical cyclone (TC) data record provides severe constraints on the ability of climate scientists to: a) determine to what degree TCs have responded to shifts in climate, b) evaluate theories on how TCs will [...]

IPCC draft (redux)

Amid the manufactured spin and excitement of the unofficial release of the IPCC WG1 Second Order Draft, it is worth remembering that this happened last time too: IPCC draft: No comment May 4, 2006 As everyone has now realised, the second-order draft of the new IPCC report has become very widely available and many of [...]

Some AGU highlights

Here a few of the videos of the named lectures from last week that are worth watching. There are loads more videso from selected sessions on the AGU Virtual Meeting site (the AGU YouTube channel has quite a lot more from past meetings too). All well worth the time. Charney Lecture: Drew Shindell “Mitigating Near-Term [...]

AGU time again…

This week is Fall AGU, the biggest climate-related conference around. Not everything is related to climate – there is a lot of other geophysics and astrophysics, but it is generally the place to go if you want to see and be seen (and incidentally, be crushed, be excited, be friendly and be frustrated that can’t [...]

Unforced variations: Dec 2012

A new meteorological season, perhaps some new science topics to discuss…

Responses to volcanoes in tree rings and models

Houston, we have a problem. Admittedly, not a huge problem and not one that most people, or even most climatologists, are particularly fascinated by, but one which threads together many topics (climate models, tree rings, paleo-climate) which have been highlighted here in the past. The problem is that we have good evidence in the ice [...]

Don’t estimate acceleration by fitting a quadratic…

… if your data do not look like a quadratic! This is a post about global sea-level rise, but I put that message up front so that you’ve got it even if you don’t read any further. The reputable climate-statistics blogger Tamino, who is a professional statistician in real life and has published a couple [...]

Stronger regional differences due to large-scale atmospheric flow.

A new paper by (free access) is likely to have repercussions on discussions of local climate change adaptation. I think it caught some people by surprise, even if the results perhaps should not be so surprising. The range of possible local and regional climate outcomes may turn out to be larger than expected for regions [...]

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