Using the degree symbol

While this probably won’t be useful to most readers, I thought I would share how to produce the degree symbol (°) using only your keyboard, on both a PC and a Mac.

On a PC: Hold the Alt key, then type 0176 on the numeric keypad, and release the Alt key.

On a Mac: Hold the Option key, type k, release the Option key.

In Mac software, the symbol for the Option key looks like a two-pronged fork. The confusing key names and symbols are one of the things I like least about Macs. They really put me off using hotkey combinations, even though I have been using Macs daily for about four years now.

Anyhow, you can now use the appropriate symbol when writing phrases like: “avoiding a mean temperature increase of more than 2°C above pre-industrial levels.”

Photographing birds in Ontario and Quebec

I enjoy photographing birds, and been having increasing luck doing so with my new 70-200mm lens. I think it might be a good project to collect images of birds that congregate around Ottawa, Toronto, and Montreal, use them as photos of the day, and identify their species.

It can be a project a bit like collecting the Oxford colleges, though it is obviously much more open-ended.

A few I have shot with the new lens:

  1. Species unknown – near the Rideau Canal locks
  2. Rock Pigeons (Columba livia) – on Somerset
  3. Species unknown – Kensington Market area, Toronto
  4. Species unknown, possibly a House Sparrow (Passer domesticus) – Victoria University, Toronto

Can anyone put a name to the unknowns above? I will try to come up with some new bird photos during the next week or so.

P.S. Has anyone tried the Canon 1.4X or 2.0X teleconverters? Does either work with the f/4 70-200mm zoom (I remember the box saying the lens is compatible with them). Do the focusing and metering systems still work properly, despite the lost 1-2 f-stops?

Cloud cover and climate change

Musician at Raw Sugar Cafe

According to research published back in April, the biggest climate changes in the 21st century may occur more due to changes in high altitude cloud cover, in response to increased temperatures from rising greenhouse gas concentrations, rather than due to the initial temperature increases themselves: Global warming due to increasing absorbed solar radiation, published in Geophysical Research Letters.

Reduced cloud cover would reduce the amount of sunlight that gets reflected back into space, rather than striking the surface of the Earth. As such, it would produce further warming. Based on evaluation of simulations used in preparing the Fourth Assessment Report of the IPCC, this effect may be of greater magnitude than the initial warming due to increased absorption of outgoing long-wave radiation by greenhouse gasses.

While the result certainly cannot be considered definitive now, it underscores the importance of improving climate models and incorporating the key feedback effects into them. Only when that has been done can more precise estimates of the climatic sensitivity of the planet be produced, as well as more accurate regional projections.

Playing with Wolfram Alpha

Ottawa street lights

Wolfram Alpha is based on a rather neat idea: making a website that can actually deal with information in an intelligent way, rather than simply search for words of things in existing pages. Put in ‘1 kg gold‘ and it will tell you that it would form a sphere 2.313cm in diameter, a cube 3.73cm to a side, and cost US$32,520. Put in ‘running 10 km/h 60 minutes 6’0″ 185lbs age 25 male‘ and it will estimate the number of calories expended. It doesn’t know about cycling yet, unfortunately. It doesn’t seem to be able to do calculations on greenhouse gas emissions yet, either, though it will tell you that mixtures of air and methane in which the methane is between 5% and 15% of the total will explode if exposed to a temperature of 595˚C. It also knows that Apple has 35,100 employees and a current P/E ratio of 23.1. It can search for base pair sequences within the human genome.

The biggest limitation of the site is phrasing things in a way it interprets properly. Indeed, most of the searches I try produce only the message: “Wolfram|Alpha isn’t sure what to do with your input.” For the time being, Wolfram Alpha is less of an open-ended vehicle for computations and data access, and more a set of discretely made tools for existing tasks. If you know which tools exist and how to format input for them, it works well. If you are trying to get it to do something its designers didn’t anticipate, it probably won’t work.

In short, Wolfram Alpha is a fun thing for statistics nerds to play around with, and could be genuinely useful for research. The best way to appreciate its current capabilities is to watch this introductory screencast.

New research on the meridional overturning circulation

Bird in a bush

Recent research undertaken by the Woods Hole Oceanographic Institution and Duke University suggests that ocean currents work differently from how they were previously considered to, with implications for climate change. Using a combination of two years worth of observations from underwater sensors and computer models, they determined that “much of the southward flow of cold water from the Labrador Sea moves not along the deep western boundary current, but along a previously unknown path in the interior of the North Atlantic.” If the results of this study are accurate, it could mean that previous attempts to model the climate system incorporated inappropriate behaviour for this current. As a result, they could have generated less accurate projections of how warming due to greenhouse gas concentrations will affect different parts of the climate system.

More information about the study is available in Nature: Interior pathways of the North Atlantic meridional overturning circulation. For those lacking time or access to Nature, here is the abstract:

To understand how our global climate will change in response to natural and anthropogenic forcing, it is essential to determine how quickly and by what pathways climate change signals are transported throughout the global ocean, a vast reservoir for heat and carbon dioxide. Labrador Sea Water (LSW), formed by open ocean convection in the subpolar North Atlantic, is a particularly sensitive indicator of climate change on interannual to decadal timescales. Hydrographic observations made anywhere along the western boundary of the North Atlantic reveal a core of LSW at intermediate depths advected southward within the Deep Western Boundary Current (DWBC). These observations have led to the widely held view that the DWBC is the dominant pathway for the export of LSW from its formation site in the northern North Atlantic towards the Equator. Here we show that most of the recently ventilated LSW entering the subtropics follows interior, not DWBC, pathways. The interior pathways are revealed by trajectories of subsurface RAFOS floats released during the period 2003–2005 that recorded once-daily temperature, pressure and acoustically determined position for two years, and by model-simulated ‘e-floats’ released in the subpolar DWBC. The evidence points to a few specific locations around the Grand Banks where LSW is most often injected into the interior. These results have implications for deep ocean ventilation and suggest that the interior subtropical gyre should not be ignored when considering the Atlantic meridional overturning circulation.

Improving our understanding of ocean currents should help to improve the accuracy of predictions from general circulation climate change models, and may be helpful in producing regionally specific projections of climate change impacts.

Downloading from YouTube and Megavideo

There are lots of sites out there that present videos in a non-downloadable way, wrapped in flash video players. For instance, there are Megavideo and YouTube. For those running Safari, there is an easy way to download these videos:

  1. On the page with the video, click ‘Window’ and the ‘Activity.’
  2. Scroll through the list until you find something plausibly large (at least a few megabytes)
  3. Select that item and copy it, either with the hotkey or from ‘Edit > Copy.’
  4. Click ‘Window’ and ‘Downloads’
  5. Paste the item, with either the menu or the hotkey.
  6. The file will download to your desktop.
  7. Add the extension .flv to the file
  8. They can be played in video players like VideoLAN.

The same trick can be used to grab other forms of embedded media from all sorts of websites, and it’s much easier than digging around in search of temporary internet files.

Changing Images of Man

Ottawa River Pathway

First published in 1974, and available for free online, Changing Images of Man is a kind of philosophical reflection on science and how human beings understand themselves. While it does touch on some interesting ideas, the degree to which it is fundamentally lacking in rigour or discipline means that it is also choked with nonsense, impenetrable jargon, and pointless speculation. In short, it does not have the feel of a text whose ideas have been borne out by subsequent history. Rather, it is more like a monument to a kind of faddishness that has long since become dated, though elements endure in the more superstitious aspects of contemporary culture.

Much of the book concerns environmental issues: specifically, how human civilization can cease to be such a destructive force, and how ecology is affecting science in general. Neither discussion is very satisfying. The former discussion focuses on a kind of caricatured extension of the Beatles going to India to lean yoga and discover themselves. While significant transformations in human behaviours and self-understanding may well be necessary to generate a sustainable society, the perspective on those changes offered in this work doesn’t seem either plausible or compelling to me. The latter discussion exaggerates the degree to which the study of complex dynamic systems challenges the practice of science: while they are certainly more challenging to study scientifically than systems that are more easily broken down and understood in terms of constituents, science is nonetheless proving increasingly capable of dealing with complex systems like climate and ecosystems, and is doing so without the kind of radical extension and modification endorsed by this book.

Much of the book is no more comprehensible than a random string of pompous-sounding words strung together in a grammatical way. It seems telling that the chapter on ‘feasibility’ is the least accessible and comprehensible of the lot. The report perceives a crisis in science that I don’t think existed at the time it was written, and I do not think has emerged since. Complex phenomenon are being grappled with using enhanced versions of conventional techniques, while UFOs and psychic phenomena have been effectively rejected as quackery, due to the absence of any good evidence for their existence. Basically, Changing Images of Man is an exhortation to abandon rigorous thought in favour of a kind of wooly inclusiveness, exceedingly open to ideas that are too vague to really engage with. The book has a naive counterculture tone, overly willing to reject what is old and unthinkingly embrace novel concepts that register with a 1960s/1970s mindset. While the questions it considers are generally good and important ones, the answers provided are vague, preachy, and largely useless.

Star Trek

Hallway leading to the library, in the Canadian Parliament

While the new Star Trek movie was entertaining, it won’t feel familiar to those whose first major contact with the series was The Next Generation. It’s a hyperactive, disorderly action film, populated mostly with teenagers who look straight out of The O.C. Star Fleet Command certainly seems surprisingly willing to give command of ships to reckless young people with no command experience. Those used to the deliberative, diplomatic approach of the Picard era are likely to find this jarring, or perhaps so alien as to be part of a different fictional universe altogether. At the same time, this film is definitely less absurd than some of the previous attempts to turn Patrick Stewart into a kind of big-screen action hero. If you insist on making Star Trek in an action genre, this may be the way to do it.

This film clearly attempts to start things afresh, and the re-launch of the series is handled in a somewhat clever way. By adopting a branching universe view of how time travel works, the writers gave themselves wide scope to produce a Star Trek variant in which significant elements of the original are vacant or absent.

Star Trek is basically a summertime puff film, strongest on visual effects and its ability to be compelling on a big screen. It is distinctly disjoined from the more intellectual traditions of the Star Trek universe, and would make an awkward platform from which to return to them. That being said, it may find a place as an entertaining and less mature split-off from the more serious mass. It’s not a film I regret seeing, but it’s not something I would care to see again.

P.S. On a technical side note, nitpickers will find plenty to quibble about, in terms of plot inconsistencies and appalling physics. For instance, why an elaborate skydive-from-space operation was necessary to disable a certain thing in one instance, when it proved quite vulnerable to conventional space-based weapons later. There are also some inconsistent transporter shenanigans. This is not a film for the type of people who care about the realities of jumping between metal platforms vertically separated by more than ten metres, without serious injury.

Down the west coast by public transit

As reported on Tristan’s blog, my friend Mike is in the process of traveling from Vancouver to Portland, by public transit alone. Apparently, this is possible because the transit systems of successive places overlap.

You can follow the journey via Twitter, or through the blog they have been updating several times a day: The I-5 Chronicles

Killing watts in Ottawa

For a while, I have been thinking about buying a Kill-a-Watt electrical meter, in order to test how much is used by various household appliances and electronics. The problem is, it doesn’t make hugely much sense to spend $30 to $50 on a device that you only really need to use once. As such, I was happy to discover that the Ottawa Public Library system actually has 142 of them available to be borrowed for free. There seem to be at least a few at every branch.

I plan to pick one up sometime this week and test the power usage of my computer, stereo, microwave, etc. I don’t think it will work with my washer or dryer, unfortunately.

[Update: 6 May 2009] I picked up a library Kill-a-Watt tonight, one week loan, no fuss, no deposit. I will post data when I have collected it.