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Archives for July 2017

Joy plots for climate change

22 Jul 2017 by Gavin

This is joy as in ‘Joy Division’, not as in actual fun.

Many of you will be familiar with the iconic cover of Joy Division’s Unknown Pleasures album, but maybe fewer will know that it’s a plot of signals from a pulsar (check out this Scientific American article on the history). The length of the line is matched to the frequency of the pulsing so that successive pulses are plotted almost on top of each other. For many years this kind of plot did not have a well-known designation until, in fact, April this year:

I hereby propose that we call these "joy plots" #rstats https://t.co/uuLGpQLAwY

— Jenny Bryan (@JennyBryan) April 25, 2017

So “joy plots” it is.

[Read more…] about Joy plots for climate change

Filed Under: Climate Science, Communicating Climate, Instrumental Record

The climate has always changed. What do you conclude?

20 Jul 2017 by Stefan

Probably everyone has heard this argument, presented as objection against the findings of climate scientists on global warming: “The climate has always changed!” And it is true: climate has changed even before humans began to burn fossil fuels. So what can we conclude from that?

A quick quiz

Do you conclude…

(1) that humans cannot change the climate?

(2) that we do not know whether humans are to blame for global warming?

(3) that global warming will not have any severe consequences?

(4) that we cannot stop global warming? [Read more…] about The climate has always changed. What do you conclude?

Filed Under: Climate Science, Communicating Climate, Paleoclimate, skeptics

Red team/Blue team Day 1

15 Jul 2017 by group

From Russell Seitz:

Filed Under: Climate Science

Climate Sensitivity Estimates and Corrections

12 Jul 2017 by Gavin

You need to be careful in inferring climate sensitivity from observations.

Two climate sensitivity stories this week – both related to how careful you need to be before you can infer constraints from observational data. (You can brush up on the background and definitions here). Both cases – a “Brief Comment Arising” in Nature (that I led) and a new paper from Proistosescu and Huybers (2017) – examine basic assumptions underlying previously published estimates of climate sensitivity and find them wanting.

[Read more…] about Climate Sensitivity Estimates and Corrections

References

  1. C. Proistosescu, and P.J. Huybers, "Slow climate mode reconciles historical and model-based estimates of climate sensitivity", Science Advances, vol. 3, 2017. http://dx.doi.org/10.1126/sciadv.1602821

Filed Under: Carbon cycle, Climate modelling, Climate Science, Greenhouse gases, Instrumental Record, Paleoclimate

Unforced variations: July 2017

1 Jul 2017 by group

So, big news this week: The latest update to the RSS lower troposphere temperatures (Zeke at Carbon Brief, J. Climate paper) and, of course, more chatter about the red team/blue team concept. Comments?

Filed Under: Climate Science, Open thread

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