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Workweek Causes Climate Changes

Shipud writes "An article in the Proceedings of the National Academy of Sciences reports that daily temperature ranges are smaller on weekdays than on weekends. This phenomenon is strongest in the US, but also appears in China and Japan. The researchers attribute this to human activity, although the exact mechanism is unclear. The prime suspect is aerosol / cloud interactions. Here is the more legible version from Scientific American"

42 of 203 comments (clear)

  1. Welp.. people drive more during the week... by NivenHuH · · Score: 4, Insightful

    ... and that definitely contributes to more pollution being in the air which will definitely have an effect on temperatures.. I don't know what's being "discovered" here..

    --
    Just when you make it idiotproof, some idiot builds a better idiot.
    1. Re:Welp.. people drive more during the week... by SirSlud · · Score: 5, Insightful

      Lots of 'discoveries' should be read as 'confirmations'. You wouldn't want to build the foundation of science and technological progression on assumptions, would you?

      Mind you, of course that happens, but I always think this way when people say 'duh'. Remember, at some point, somebody would have said 'duh' had you concluded that the earth was the centre of the universe. ;)
      Garret

      --
      "Old man yells at systemd"
    2. Re:Welp.. people drive more during the week... by rrkap · · Score: 4, Insightful

      ... and that definitely contributes to more pollution being in the air which will definitely have an effect on temperatures.. I don't know what's being "discovered" here..

      Then you're remarkably uncurious or ignorant. What's the mechanism? Why is it different in coastal cities than inland ones? This is an interesting and localized (both in time and in space) effect of human activity. I don't really have a good guess as to what is causing it. You can't just say air pollution without examing the mechanism. It could be something really off the wall like change in averge absorptivity of the ground because all the parking lots are full.

      --
      I like my beverages with warning labels!
    3. Re:Welp.. people drive more during the week... by umofomia · · Score: 2, Insightful
      ... and that definitely contributes to more pollution being in the air which will definitely have an effect on temperatures.. I don't know what's being "discovered" here..
      This may seem obvious to many of us, although there are some people out there that absolutely refuse to believe that humans can have any noticeable effect on the environment. To see this, just read any of the literature out there claiming that global warming does not exist. (Note: I am not saying that this study shows that global warming is definitively caused by humans, although this does provide evidence that humans can have some effect on the environment.)
    4. Re:Welp.. people drive more during the week... by cyt0plas · · Score: 2, Insightful

      > Lots of 'discoveries' should be read as 'confirmations'.

      But then what would the media use for sensationalist stories? After all, _somebody_ has probably figured it out already, the rest of us just haven't caught on yet.

      --
      Contact Me (got tired of viruses emailing me).
    5. Re:Welp.. people drive more during the week... by kin_korn_karn · · Score: 2, Funny

      Scientists don't like to say that the earth is in the center of the universe, however, since it sounds very Ptolemaic. As a scientist nowadays, the fashionable approach is to consider oneself and one's situation as meager and uninteresting as possible. In this vein you can conclude that, in an infinite universe, every point is the center. However, while we don't know whether spacetime itself is infinite, we sure as hell know that matter isn't - otherwise it would be light-as-day during the night (which it isn't)! So, scientists who fancy the universe-is-infinite approach to avoid placing the earth at the center is just fooling himself.
      In other news, another AC got stoned for the first time today.

    6. Re:Welp.. people drive more during the week... by ctr2sprt · · Score: 3, Insightful
      It probably seems intuitive to you, and that's the problem. Lots of intuitive things just aren't true, because usually your guesses are based on incomplete or simply incorrect information. That's why it's important for scientists to prove their theories instead of just accepting them blindly.

      I, for one, find it encouraging that scientists are out there finding supporting evidence for the predominant theories. Contrary to what many Slashdot posters seem to think, our understanding of the global (and local!) environment is far from complete. It's even less of an exact science than psychiatry is. ("For some reason, doing this causes something to happen. We have no idea why, we're not entirely sure what happens, and sometimes something completely unexpected happens instead, but at least it gives us some measure of control.") That's why findings like this are important: it's predicted by an extremely shaky theory, so it's one more piece of evidence that our theory is right, and what we think is happening actually is.

    7. Re:Welp.. people drive more during the week... by John+Miles · · Score: 2, Informative

      Actually, many scientists believe that the earth is at the center of the universe

      Actually, not.

      --
      Dahlmann tightly grips the knife, which he may have no idea how to use, and steps out into the plain.
    8. Re:Welp.. people drive more during the week... by Bull999999 · · Score: 3, Funny

      Earth may not be center of the universe as in beer, but it is the center of the universe as in freedom.

      --
      1f u c4n r34d th1s u r34lly n33d t0 g37 l41d
    9. Re:Welp.. people drive more during the week... by Mooncaller · · Score: 3, Informative
      You wouldn't want to build the foundation of science and technological progression on assumptions, would you?

      Umm, math and science ARE built upon assumptions. They are called Axioms. Goedel: Any formal system must be based on theroms not provable by that system.

    10. Re:Welp.. people drive more during the week... by Gojira+Shipi-Taro · · Score: 4, Funny

      That's it, you've convinced me. I'm having my car's brakes removed tomorrow. "For the Children"

      --
      "Oh my God. This is terrible. This is the end of my Presidency. I'm fucked."; ~ Donald J. Trump
    11. Re:Welp.. people drive more during the week... by glitch! · · Score: 3, Interesting

      It probably seems intuitive to you, and that's the problem. Lots of intuitive things just aren't true, because usually your guesses are based on incomplete or simply incorrect information. That's why it's important for scientists to prove their theories instead of just accepting them blindly.

      That's a very good point. For instance, it is "obvious" that plastic cutting boards are better than wood, right? Well, actually no...

      Here is just one interesting comparison of cutting boards.

      Sometimes you just have to set aside your assumptions and find out.

      --
      A dingo ate my sig...
  2. Does this explain by gnuke · · Score: 5, Funny

    why it's nice and sunny all week and then rains every weekend?

    1. Re:Does this explain by waynemcdougall · · Score: 5, Informative
      Actually it does. As reported in Nature, August 1998.

      Popular press take on it

      Abstract:
      Direct human influences on climate have been detected at local scales, such as urban temperature increases and precipitation enhancement, and at global scales,. A possible indication of an anthropogenic effect on regional climate is by identification of equivalent weekly cycles in climate and pollution variables. Weekly cycles have been observed in both global surface temperature and local pollution data sets. Here we describe statistical analyses that reveal weekly cycles in three independent regional-scale coastal Atlantic data sets: lower-troposphere pollution, precipitation and tropical cyclones. Three atmospheric monitoring stations record minimum concentrations of ozone and carbon monoxide early in the week, while highest concentrations are observed later in the week. This air-pollution cycle corresponds to observed weekly variability in regional rainfall and tropical cyclones. Specifically, satellite-based precipitation estimates indicate that near-coastal ocean areas receive significantly more precipitation at weekends than on weekdays. Near-coastal tropical cyclones have, on average, significantly weaker surface winds, higher surface pressure and higher frequency at weekends. Although our statistical findings limit the identification of cause-effect relationships, we advance the hypothesis that the thermal influence of pollution-derived aerosols on storms may drive these weekly climate cycles.

      --
      Recycle PCs and build a wireless community network www.hillsborough.org.nz
    2. Re:Does this explain by Anonymous Coward · · Score: 2, Funny

      Yes you were correct, this article confirms your belief that you prinicple and teachers have been controlling the weather for many years.

    3. Re:Does this explain by fenix+down · · Score: 2, Funny

      Anybody else know that "The Way Things Really Work" book? I got it as a present a few years ago, I think. Making fun of "The Way Things Work" with these big overcomplicated flow-chart cartoons about the photo shop guys stealing all the pictures of your wife in her bathing suit. Alternately stupid and funny. The only one I really remember is the one explaining how airport P.A.s work. The guy eats a bunch of "garble lozenges" first and covers the microphone with a "mumble mitten" and whatever. I know he did one for why it rains on weekends, but I don't remeber any of it.

  3. Not a Surprise Considering... by DaRat · · Score: 4, Funny

    ... the make up of most teams. After all, with the amount of hot air and BS coming from your PHB and the more difficult members of your team, do you wonder why there is an impact on the climate after a 2 hour team meeting?

  4. The solution! by Anonymous Coward · · Score: 5, Funny

    A mandatory 7 day work week! This will result in stability.

  5. Aerosol by NanoWit · · Score: 5, Funny

    I know when I'm driving to work on weekdays I go through about 2 cans of aerosol spray. You know, just to pass the time. Maybe it's my fault, sorry guys.

  6. more legible version by somethingwicked · · Score: 2, Funny

    The prime suspect is aerosol / cloud interactions. Here is the more legible version from Scientific American"

    Because its the weekend at the Scientific American and they don't have the aerosol/cloud interactions making it hazy and unreadable. So their "legible version" is weekday free making it less blurry!

    --

    ---"What did I say that sounded like 'Tell me about your day?'"---

  7. Bah, this is /. by justMichael · · Score: 2, Funny

    most folks here don't use either ;)

  8. This can't be right. by hcuar · · Score: 5, Funny

    Nah, this can't be right... The matrix would suffer from low power and the human's would start to see glitches. OMG! That's why I had to work weekends for the last year! Here I thought it was because we were hopelessly behind in our project! Maybe it is true!

  9. Or, more importantly, by Jailbrekr · · Score: 2, Funny

    Can you quantify whether there is a change in temperature variations when SCO publishes yety another press release?

    --
    Feed the need: Digitaladdiction.net
  10. Sept. 11-13, 2001 Research Results by Anonymous Coward · · Score: 5, Interesting

    Due to the unprecedented halt of all non-military air travel over the United States during the above period, scientists were able to perform research on the effects of jet contrails. During their research, it was found that a single jet contrail could be tracked by satellite across the U.S., growing from a narrow plume of vapor to substantial cloud cover as it traveled the country. Such detailed observation was not possible before, due to the thousands of flights a day crossing the U.S. I believe the study you are referencing is linked to this one.

    The majority of flights across the U.S. are during the daytime hours on weekdays. Sounds like a high probability of a connection here, this deserves further investigation.

    M.O.
    http://www.madocowain.com
    http://www.play maille.com

  11. The actual prime suspect by worst_name_ever · · Score: 5, Funny
    The prime suspect is aerosol / cloud interactions.

    No, the prime suspect is my co-worker Bob. Man, does that guy ever have B.O. Jeez.

    --

    In Soviet Rush, today's Tom Sawyer gets high on you.
  12. Another possible reason is... by NewbieV · · Score: 4, Informative
    Airline traffic. CNN reported on some research conducted by the University of Wisconsin while US air traffic was grounded.

    Relevant quote:

    "As a result, they (contrails) help reduce the daily range in daytime highs and nighttime lows. Contrails, by providing additional insulation, further reduce the variability."

    --


    "For every right, an equal responsibility..."
  13. That's why it rains on weekends by whereiswaldo · · Score: 2, Interesting

    I was trying to look for a report I read once that pointed to higher smog during weekdays as a major factor in rain occurring mostly on weekends.

    This report probably says some of the same things, though:

    Ozone Linked to Warmer Weekend Temperatures in Toronto

  14. Similar Effect to Microclimates by darkstar949 · · Score: 3, Interesting

    The effect that cities have (i.e. Microclimates) on the local tempatures in relation to the area around them has been known for some time and this seems to be a logical extention of the microclimate. As such it seems logical that the exaust from cars would tend to be greater on weekdays when people are going to and from work, and would decline on the weekends.

  15. Thats it... by buktotruth · · Score: 2, Funny

    Thats it, i'm staying home during the week and going to work on the weekends. Gotta counteract this "weekend effect somehow"...even if it means going to work 3 days less during the week. I'll be taking one for the team here.

  16. A Possibility I was partially responsible for by Anonymous Coward · · Score: 5, Interesting

    Many of the weather stations that record the data that these people used are simple mercury or alcohol thermometers that get read by humans.

    I was one of these thermometer readers in grad school. During the work week, I was up for class or to go to the office, so I always read the thermometer at the same time, like I was supposed to. On weekends, it was hard to get the motivation to get out of bed early just to read a thermometer, so a lot of times I read it later than I was supposed to and guesstimated what the temp was a few hours earlier.

    I worried about the researchers using data from my weather station, but not enough to drag my butt out of bed any earlier.

    1. Re:A Possibility I was partially responsible for by Mooncaller · · Score: 2, Informative

      The stations used to collect data for these studies were specificaly set up to do this study, i.e. setup to insure that the error in data was independent of the week cycle. All meteroligist are well aware of the traditional unreliability of weekend/holiday data. This is one of the reasons for the data collection portion of these studies. Otherwise a lot of time and effort could have been saved by using already existing data.

  17. Re:What about mass Taco Bell Picnics? by RobinH · · Score: 3, Funny

    Did anyone test to see if the consumption of bean filled meals changed the environment? They blame global warming on bovine flatulence but it could it be the mass consumption of burritos?

    I always wondered why it was so hot in Mexico... now I know! Wow, on Slashdot, you learn something new every day.

    I already figured out why it's colder in Canada though... you see, people up here in Canada are more likely to wear insulated clothing, and that keeps body heat from escaping into the environment. This effect is most notable in the winter, when almost everyone wears several layers of insulated clothing when going out of their house, and this translates to even colder temperatures than usual. Of course, the interiors of houses still stay warm all year long, because people never wear bulky clothing indoors; that would be rather inconvenient, after all.

    --
    "I have never let my schooling interfere with my education." - Mark Twain
  18. I read a book by anotherone · · Score: 2, Funny

    I saw a book a few years ago called "The Way Things Really Work", which proposed something very close to this theory. It was a humor book, however. It also suggested that we add a few more days to the week to solve the problem.

    --
    Username taken, please choose another one.
  19. I guess... by iomud · · Score: 4, Funny

    Unemployment is the new environmentalism.

  20. Strange side effect of 9/11 by fuqqer · · Score: 2, Interesting

    When 9/11 occurred, I remember seeing an article saying that during the 4 days that worldwide flights were grounded, there was a 3-5%(I think) decrease in cloud cover. I presume this is because of con trails and exhaust conglomeration in the sky. It led to a rise in temperature during the day, and less insulation so it was colder at night. Does anyone have any links? I couldn't find anything.

    I always used to fantasize that, "If I became king, I would outlaw all auto usage for one day a month at least." Maybe scientific validation won't lead me to begin my brutal takeover of the world...

    -non sig-Welcome your new slashdot overlord!

    1. Re:Strange side effect of 9/11 by fuqqer · · Score: 3, Informative

      Ahhhhh.... Here it is. It's a Chicago Tribune article.

      -non sig- You're stuck with my non sig in your brain cells now. I guess you could drink it away.

  21. Good Science vs. Bad Science by __aagmrb7289 · · Score: 4, Insightful

    Unlike most of the "it's obvious" responses I read through the thread on this article (followed by a simplistic explanation of a single cause, etc.), these researchers (and the publishers) did a great job carefully explaining how they did the testing, what their conclusions were, and why the conclusion was the only one possible. They did not attempt to tie in a bunch of agendas to their research, they merely stated the clear and definite tie between our actions and the temperature difference.

    Now, if only we here at /. can follow this example, and watch for this clarity in other "scientific studies" - if they aren't being this clear and precise, then they are pushing an agenda (and since that is such a simple conclusion, it's likely wrong (at least in some circumstances), but close enough...)

  22. Contrails / Chemtrails / Crackpots by switcha · · Score: 3, Interesting

    If contrails get your conspiracy bones jittery, check out this piece our local weekly did on chemtrails and the people who love them.

    --
    You know what? ... A little club soda *did* get that out!
  23. Re:Try publishing that theory by pla · · Score: 4, Informative

    Because global warming doesn't act over a period of days

    Global warming, no. Local effects, yes.

    In case we've already forgotten, during the no-fly restriction after the WTC attack, daily temperature variations changed by up to two degrees Fahrenheit per day in areas normally having the highest levels of air traffic.

    So yes, something as simple as increased particulate matter in the air leads to increased cloud formation, drastically affecting local weather, over the course of hours rather than years.

    Such changes may have little to no long-term effects, but they do occur, and do have a simple enough explanation that your "average uneducated slashbot" can understand it. More particulates means more clouds, which means less temperature variation.

  24. Re:Does this mean? by Sponge+Bath · · Score: 3, Funny
    ...if I ate beans for lunch, my fart will warm the atmosphere by .000000001 degree?

    Large scale farting (involving sheep) is required for real change:
    http://209.157.64.200/focus/f-news/947129/posts

    I heard that President Bush is planning a preemptive strike on New Zealand because of their weapons of mass flatulence (WMF). A division of scotsmen will be air dropped in to plug the holes.

  25. Re:Welp.. thanks for playing... by Brad+Mace · · Score: 2, Insightful
    That's not insightful; that's obvious, redundant, and unnecessary. When modding, think about why someone else would want to read a comment. If you can't think of a reason, don't mod it up.

    Hopefully this experiment means that the people feigning humility with their "humanity can't have that much effect on the world" crap will have to shut up now. Unlike years and months, weekdays are completely arbitrary, so either humans are effecting the environment, or it's a billion to one coincidence.

  26. Smooth. by Fantastic+Lad · · Score: 2, Insightful
    Did they compare temperature changes in the cities to temperature changes in areas of low population? If not, their results are meaningless, or at least the conclusion they draw is meaningless. This is another example of mixing up association with causation.

    I love how you ask the question, and then before even pausing to find the answer, you leap to your pre-determined conclusion; (That the science must be bad.)

    Next time you stick your fingers in your ears, try also singing, "La La La." Works better.


    -FL