Quotulatiousness

October 5, 2013

Climate models, trust, and spin

Filed under: Environment, Media — Tags: , , — Nicholas @ 08:58

In Reason, Ronald Bailey asks whether we can trust the IPCC’s climate models:

On Monday, the U.N.’s Intergovernmental Panel on Climate Change (IPCC) released the final draft of Climate Change 2013: The Physical Sciences Basis. The report’s Summary for Policymakers flatly states: “Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased.” Pretty much everyone concerned with this issue agrees that those are the facts. But what is causing the planet to warm up? Here is where it gets interesting.

[…]

The IPCC report acknowledges that almost all of the “historical simulations do not reproduce the observed recent warming hiatus.” Not to worry, it assures us; 15-year pauses just happen, and you can’t really expect the models to simulate these kind of random natural fluctuations in the climate. Once this little slow-down passes, “It is more likely than not that internal climate variability in the near-term will enhance and not counteract the surface warming expected to arise from the increasing anthropogenic forcing.” In other words, when the warm-up resumes it will soar.

John Christy, a climatologist at the University of Alabama in Huntsville, has come to a different conclusion. Christy compared the outputs of 73 climate models for the tropical troposphere used by the IPCC in its latest report with satellite and weather balloon temperature trends since 1979 until 2030. “The tropics is so important because that is where models show the clearest and most distinct signal of greenhouse warming — so that is where the comparison should be made (rather than say for temperatures in North Dakota),” Christy explains in an email. “Plus, the key cloud and water vapor feedback processes occur in the tropics.” When it comes to simulating the atmospheric temperature trends of the past 35 years, Christy found, all of the IPCC models are running hotter than the actual climate.

[…]

Average of model results compared with temperature trends

Average of model results compared with temperature trends

To defend himself against any accusations of cherry-picking his data, Christy notes that his “comparisons start in 1979, so these are 35-year time series comparisons” — rather longer than the 15-year periods whose importance the IPCC disputes.

Why the discrepancy between the IPCC and Christy results? As Georgia Tech climatologist Judith Curry notes, data don’t speak for themselves; researchers have to put them into a context. And your choice of context — say, the year you choose to begin with — can influence your conclusions considerably. While there may be nothing technically wrong with the way the IPCC chose to display the comparison between model data and observation data, “Curry observes, it will mislead the public to infer that climate models are better than we thought.” She adds, “What is wrong is the failure of the IPCC to note the failure of nearly all climate model simulations to reproduce a pause of 15+ years.”

The future of post-IPO Twitter from the user perspective

Filed under: Business, Technology — Tags: , , — Nicholas @ 08:40

In Maclean’s, Jesse Brown looks at the ominous signs of change for Twitter’s users in a post-IPO world:

As a private company, Twitter prioritized the user’s experience. I would go so far to say that providing an excellent user experience was the whole point of Twitter’s existence.

I didn’t get Twitter, at first. It seemed like just a stripped-down, feature-limited version of Facebook’s News Feed. Of course, that was the whole idea. By constraining users to 140 characters of text and a few buttons for sharing, “favoriting” or replying, and by eliminating the concept of mutually accepted friendship as a requirement for network growth, Twitter provided a simple, lightweight, super-charged information machine. The initial absence of pictures and video helped it move lightly across the slower phones of the time, and the arbitrary, spartan limitation on tweet length was a stroke of brilliance, forcing brevity upon its users to prevent blabbermouths and spammers from clogging up everybody’s feeds.

[…]

They will soon be under intense pressure to bring that number up, and in preparation, Twitter is moving away from sponsored tweets and sponsored trends, investing heavily in slick, complicated new ad products like Twitter Amplify, which embeds video clips into tweets with unskippable pre-roll ads. I can’t imagine any Twitter user saying “what this service really needs is some TV commercials!”

And whereas once Twitter played nicely with other apps, welcoming other companies (like Canada’s HootSuite) to build new apps that plug into Twitter and build on its network, they’ve since been frustrating developers with increasingly restrictive changes to its API, the interface it provides to outsiders. Last year, for example, Twitter put a cap on the number of users a third-party app could support. Now, if your Twitter-based service gets too popular, you’ll have to ask Twitter for permission to grow.

The care and feeding of introverts

Filed under: Health, Science — Tags: — Nicholas @ 07:55

Carl King has a list of myths that are somewhat widely believed about that odd class of people, the introverts:

I wrote this list in late-2008. Around that time, I was lucky enough to discover a book called, The Introvert Advantage (How To Thrive in an Extrovert World), by Marti Laney, Psy.D. It felt like someone had written an encyclopedia entry on a rare race of people to which I belong. Not only had it explained many of my eccentricities, it helped me to redefine my entire life in a new and productive context.

Sure, anyone who knows me would say, “Duh! Why did it take you so long to realize you’re an Introvert?” It’s not that simple. The problem is that labeling someone as an Introvert is a very shallow assessment, full of common misconceptions. It’s more complex than that.

A section of Laney’s book (page 71 through page 75) maps out the human brain and explains how neuro-transmitters follow different dominant paths in the nervous systems of Introverts and Extroverts. If the science behind the book is correct, it turns out that Introverts are people who are over-sensitive to Dopamine, so too much external stimulation overdoses and exhausts them. Conversely, Extroverts can’t get enough Dopamine, and they require Adrenaline for their brains to create it. Extroverts also have a shorter pathway and less blood-flow to the brain. The messages of an Extrovert’s nervous system mostly bypass the Broca’s area in the frontal lobe, which is where a large portion of contemplation takes place.

Unfortunately, according to the book, only about 25% of people are Introverts. There are even fewer that are as extreme as I am. This leads to a lot of misunderstandings, since society doesn’t have very much experience with my people. (I love being able to say that.)

H/T to Joey deVilla for the link.

Reckoning military strength is more complex than counting tanks, ships, or noses

Filed under: Britain, Military, Technology — Tags: , , , , — Nicholas @ 07:44

Sir Humphrey is back from his honeymoon and posts about the unfailing media habit of nostalgically looking back at the military of the Cold War era and contrasting it with the much smaller military of today:

When one looks back over the last 150 years, the possession of large military forces by the UK has been somewhat of an aberration. If you ignore WW1 & WW2, then the only period in which large forces were sustained was from 1945 until the end of the Cold War. This could only be done by relying firstly on large numbers of conscripts, then having to provide very low pay after the end of National Service. It is telling that once military wages began to catch up with, then overtake civilian roles, manpower quickly became increasingly unaffordable. Similarly it is easy to forget that this period is one of the very few in UK history where there was a clearly defined opponent, where UK forces had a clear role to play (e.g. maintain BAOR, defend the home base, conduct ASW) as well as support wider non NATO commitments. It is much easier to justify the retention of larger armed forces when you have a specific role in mind for them, and not just being held at readiness as a contingency.

In the UK we are perhaps guilty of looking back on the Cold War period as halcyon era where we had large armed forces, while forgetting that they existed to do very specific roles, and also encourage other nations to pull their weight too. The post Cold War era wasn’t some wonderful period where UK forces roamed the globe in glorious isolation emulating Palmerston’s views, but a period when the UK had to contribute to an international coalition and work with our partners against a common enemy. This is important to remember, for the argument that 30 years ago we had X frigates, Y jets and Z tanks compared to today’s paltry number is actually misleading. In reality much of this equipment was fully committed to NATO forces, and wasn’t easily available to support wider UK national interests beyond the NATO area. So yes, the UK had capabilities, but they were borne to meet a specific external threat, and not a general role.

Similarly, if one looks at availability, it becomes clear that in real terms UK capability for purely national tasks now isn’t far off what it was at the end of the Cold War. Speaking to a Naval friend who joined in the late 1980s, he pointed out that of the 47 escorts when they joined, nearly a third were usually tied up in refit. Add to this the tasking and working up of escorts for things like NATO commitments, and support to the South Atlantic, and suddenly that’s the best part of another 15 escorts committed. At best there would be a margin of some 10-15 hulls available for national discretionary deployments — not much more than is available today.

Yes, yes, but what about tiny Obscuristan with their 500 tanks? Britain is much bigger than Obscuristan, shouldn’t the British army have more tanks than them? And Fantasia has more ships in their navy than the Royal Navy does!

It is also important to realise when looking at these sorts of papers that nations have very different defence requirements. It is one thing to say we have less soldiers than say, South Korea, but we forget that we do not have a nuclear armed neighbour on our border with a leader who is not always a completely rational actor. It is entirely logical that some nations will have more military personnel than the UK — they have direct ground threats, or their need for manpower for other jobs means it is politically helpful to keep a large army to hand. For instance many states still conscript their troops, meaning on paper their army is vastly larger than the British Army, but this is only achieved through a ready pool of manpower who can be paid a pittance and employed on duties which are often as much about support local agriculture by working on farms, or support public order as it is about being a military force.

There are also many nations out there who on paper have large stockpiles of equipment (particularly in the Middle East) and this can easily be turned into a headline about how a tiny nation has more tanks than the UK. The reality though is that these purchases are little more than an insurance policy designed to coax the nations into feeling an obligation to support the purchaser in a real crisis. If one views defence sales to the Middle East as a means of these nations buying support through economic largesse then that’s probably not far off the mark. Many of these equipment buys are in fact often stored in the desert and left to rust without ever being used. The author has heard many tales of armouries full of weapons never removed from packing crates, or trained on and often forgotten about. On paper this is a capability, and in reality it is little more than a box of life expired spare parts. One difference between the UK and many other nations is that the UK is willing to genuinely use and ‘sweat’ its assets to get the most from its equipment purchases. Just because some nations have impressive arsenals does not equate to a genuine ability to use them to best effect.

QotD: Immortality, if you want it

Filed under: Humour, Science, Technology — Tags: , — Nicholas @ 00:01

Those of us who are non-believing heathens might prefer porting our minds to robot bodies before the natural expiration date on our organic selves. It’s hard to wrap your head around the idea that a digital representation of your mind, no matter how accurate, is still “you” in some sense. But I think that fear will go away as soon as we see the first robot that thinks and acts exactly like Uncle Bob did before he made the jump. If Uncle Bob the robot acts human enough, we’ll come to see him as the same entity that once inhabited an organic shell. When technology is sufficiently advanced, we’ll get past the magical thinking about spirits and souls and the specialness of having organic parts.

To me, the most interesting possibility for the future involves porting human minds to software that includes entirely simulated realities. Such a program — a digital mind if you will — could live in an entirely artificial reality and experience what seems to be a genuine human life for the rest of eternity, or at least as long as the software keeps running. The freaky part is that if such a thing will someday be possible — and I think it will — then it follows that the time after it happens will be infinitely long whereas the history of time before it happens is finite. So it follows that there is an infinitely greater chance you are already the simulation and not a human who is reading this paragraph and contemplating it. Weird.

If you didn’t already have enough reasons to eat right, exercise, and keep your mind sharp, consider what you might be bringing to your own immortality. I was hoping to get there before the dementia sets in. But I just reread what I wrote and apparently I’m already too late.

Scott Adams, “Choose Your Immortality: Someday you’ll be a robot with a locket holding your last human cells”, Time, 2013-09-18

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