Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
michael_nielsen's profile
michael_nielsen
michael_nielsen
michael_nielsen
@michael_nielsen

Tweets

michael_nielsen

@michael_nielsen

Searching for the numinous. Co-purveyor of https://quantum.country/ 

San Francisco, CA
michaelnielsen.org
Joined July 2008

Tweets

  • © 2019 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      Hmm. Was wondering why most of the observed warming was over land, but most of the heat is in the ocean surface. Of course, the very high specific heat of water is the reason! Can dump huge amounts of heat there, and get only a small change.

      1 reply 0 retweets 8 likes
      Show this thread
    2. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      That fact + high circulation / mixing of ocean water seems likely to be the reason the warming over the oceans is so much more uniform.

      1 reply 0 retweets 3 likes
      Show this thread
    3. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      Interesting to contrast the average temperature anomaly with the sea level change. Some correlation, but the sea level change is much more smoothed out. I don't understand why.pic.twitter.com/4Dj4I2QjAQ

      3 replies 2 retweets 4 likes
      Show this thread
    4. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      I guess the sea level change is likely responsive to local changes in temperature in polar regions. Which may be more smoothed than global temperature anomaly. (But I don't see why. Also: don't have a good model of the relationship between temp change & sea-level rise, anyway)

      4 replies 1 retweet 2 likes
      Show this thread
    5. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      Actually, that world energy consumption graph is really fascinating. From Wikipedia: Surprised not to see natural gas rising more. Goes against the common narrative I hear around the rise of fracking / natural gas.pic.twitter.com/MC6BB5Epuy

      3 replies 2 retweets 12 likes
      Show this thread
    6. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      michael_nielsen Retweeted michael_nielsen

      Curious to contrast with this paper showing evidence that CO2 emissions have peaked (mostly due to fracking):https://twitter.com/michael_nielsen/status/674738150367993856 …

      michael_nielsen added,

      michael_nielsen @michael_nielsen
      Paper in Nature Climate Change (tentatively) suggests global CO2 emissions may be declining http://www.nature.com/articles/nclimate2892.epdf?referrer_access_token=s1awyyC-oO6etR336Cj_HNRgN0jAjWel9jnR3ZoTv0PZ7Wa610RO0dCDFlIIHZ74qcAiRyRLeTjy1w-5IRtPPSUdHbny_NP43wRzYrSEjYc3Yy3cCrW_6kuwy-8K-e8OQuzShps06O73r4wsofA5E-O-EaT7dZSiSRMkiGRrojMwUaRyzOpRy3ekJ1-825iQFi1DD4m81eHFBKN23yCWMP5KNb0xzqXoDieEXqJ8IqROptfJ-r2JDpgA5iSBDIISsx6p41e_yqf5lm2_P31ZPQ%3D%3D&tracking_referrer=www.nytimes.com … pic.twitter.com/RPCzAqPVaM
      3 replies 2 retweets 12 likes
      Show this thread
    7. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      TIL: Nitrous oxide - laughing gas - is an important greenhouse gas. (I wish water vapour was on this graph.)pic.twitter.com/Nk2Zaa1fTR

      2 replies 0 retweets 2 likes
      Show this thread
    8. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      Interesting that methane is apparently levelling out. I don't know why.

      3 replies 0 retweets 2 likes
      Show this thread
    9. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      Also, an estimate I heard in a talk by David Keith: the atmospheric half-life of CO2 is about 1000 years. So without some type of reclamation / sequestration technology, just keeps rising, except over very long time scales.

      3 replies 1 retweet 5 likes
      Show this thread
    10. michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      This graph is one of the most fascinating I know of, period (and the error bars are outright the most fascinating I know of). It's the IPCC report's estimate of the radiative forcing due to several sources, with 95% CI's.pic.twitter.com/8H8qMhkO1V

      1 reply 5 retweets 11 likes
      Show this thread
      michael_nielsen‏ @michael_nielsen 9 Sep 2018
      • Report Tweet

      A few comments: total estimated forcing is 2.3 Watts per square meter. That's about 0.17% of the solar constant (about 1367 Watts per square meter), a truly tiny (but nonetheless monumental) change!

      11:49 AM - 9 Sep 2018
      • 3 Likes
      • Smerity
      2 replies 0 retweets 3 likes
        1. New conversation
        1. michael_nielsen‏ @michael_nielsen 9 Sep 2018
          • Report Tweet

          I wish the error bars were discussed a LOT more. A funny thing: in popular writing about climate change, the writer often effectively yells loudly "we KNOW this is going on, anyone who doesn't think so is an anti-science ignoramus." This turns me off.

          2 replies 0 retweets 11 likes
          Show this thread
        2. michael_nielsen‏ @michael_nielsen 9 Sep 2018
          • Report Tweet

          Anyone who discusses a complex subject and turns it into simple slogans, and evinces complete certainty & dismissal of opponents, is someone I have a lot of trouble trusting.

          2 replies 4 retweets 16 likes
          Show this thread
        3. michael_nielsen‏ @michael_nielsen 9 Sep 2018
          • Report Tweet

          Feynman: "In physics the truth is rarely perfectly clear, and that is certainly universally the case in human affairs. Hence, what is not surrounded by uncertainty cannot be the truth.”

          1 reply 10 retweets 30 likes
          Show this thread
        4. michael_nielsen‏ @michael_nielsen 9 Sep 2018
          • Report Tweet

          In any case, I find those error bars - and the enormous effort the IPCC has put into really understanding them (and great care in reducing them) - absolutely fascinating.

          1 reply 0 retweets 6 likes
          Show this thread
        5. michael_nielsen‏ @michael_nielsen 9 Sep 2018
          • Report Tweet

          I'd be curious to know the effect of the Montreal protocol (banning CFCs) on radiative forcing, since - I believe - CFCs are an aerosol reducing radiative forcing. While banning CFCs was a good thing, did it contribute to global warming?

          4 replies 0 retweets 3 likes
          Show this thread
          6. End of conversation
        2. New conversation
        1. Nick Barnes‏ @nickbarnes 9 Sep 2018
          • Report Tweet
          Replying to @michael_nielsen

          Yes, but the forcing is per m^2 of *surface* and is 24/7. You have to divide the solar constant by pi, and subtract reflection. Net is about 240 W/m^2.

          1 reply 0 retweets 0 likes
        2. Nick Barnes‏ @nickbarnes 10 Sep 2018
          • Report Tweet
          Replying to @nickbarnes @michael_nielsen

          "divide ... by pi": because the earth's surface is not perpendicular to incident radiation.

          0 replies 0 retweets 0 likes
          3. End of conversation

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2019 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info