Skip to main content

Home/ Advanced Concepts Team/ Group items tagged climate

Rss Feed Group items tagged

Dario Izzo

Critique of 'Debunking the climate hiatus', by Rajaratnam, Romano, Tsiang, and Diffenba... - 8 views

  •  
    Hilarious critique to a quite important paper from Stanford trying to push the agenda of global warming ....

    "You might therefore be surprised that, as I will discuss below, this paper is completely wrong. Nothing in it is correct. It fails in every imaginable respect."
  • ...4 more comments...
  •  
    To quote Francisco "If at first you don't succeed, use another statistical test"
    A wiser man shall never walk the earth
  •  
    why is this just put on a blog and not published properly?
  •  
    If you read the comments it's because the guy doesn't want to put in the effort.
    Also because I suspect the politics behind climate science favor only a particular kind of result.
  •  
    just a footnote here, that climate warming aspect is not derived by an agenda of presenting the world with evil. If one looks at big journals with high outreach, it is not uncommon to find articles promoting climate warming as something not bringing the doom that extremists are promoting with marketing strategies. Here is a recent article in Science:

    http://www.ncbi.nlm.nih.gov/pubmed/26612836

    Science's role is to look at the phenomenon and notice what is observed. And here is one saying that the acidification of the ocean due to increase of CO2 (observed phenomenon) is not advancing destructively for coccolithophores (a key type of plankton that builds its shell out of carbonates), as we were expecting, but rather fertilises them! Good news in principle!

    It could be as well argued from the more sceptics with high "doubting-inertia" that 'It could be because CO2 is not rising in the first place'', but one must not forget that one can doubt the global increase in T with statistical analyses, because it is a complex variable, but at least not the CO2 increase compared to preindustrial levels.

    in either case : case 1: agenda for 'the world is warming' => - Put random big energy company here- sells renewable energies
    case 2: agenda for 'the world is fine' => - Put random big energy company here - sells oil as usual

    The fact that in both cases someone is going to win profits, does not correllate (still not an adequate statistical test found for it?) with the fact that the science needs to be more and more scrutinised. The blog of the Statistics Professor in Univ.Toronto looks interesting approach (I have not understood all the details) and the paper above is from JPL authors, among others.
Thijs Versloot

CO2 capture from humid gases - 0 views

  •  
    Researchers have managed to create a materials that can extract CO2 from a humid environment, which was up to now not possible due to water blocking the absorption. With this hurdle taken, it may be possible to extract CO2 in large quantities from the atmopshere. This would then either be stored or possible even processed with H2 to form carbohydrates. Marsian atmosphere?
Christophe Praz

The 10 warmest years: Not exactly forever ago - 1 views

  •  
    Last week NASA and NOAA announced that 2014 topped the list of hottest years ever recorded. Yikes! What's worse, the ten warmest years ever recorded have all occurred since 1998. Yikes again!

    In the meantime, the ACT is skiing on stones and rocks in Switzerland ^^
Athanasia Nikolaou

The known unknowns - the outstanding 49 questions in Earth sciences (Part I) - 4 views

  •  
    Open questions in geoscience. Food for thought
Athanasia Nikolaou

Diamond squished to reveal secrets of giant planets - 1 views

  •  
    Lasers + diamonds --> simulate pressure of thousands of atmospheres on planetary cores!
  •  
    As a side note, this is also being used as method to create a hypothetical substance called 'metallic hydrogen'. At such high pressures, hydrogen itself should become superconducting at room temperature and thus of tremendous interest...
Christophe Praz

Gigantic Ocean Vortices Seen From Space Could Change Climate Models | Science | WIRED - 5 views

  •  
    True! Half the Phd Positions offered are in studying eddy variability. It links to resolving the - yet another holy grail - problem of turbulence.
LeopoldS

Risky Business | The Economic Risk of Climate Change in the US | Risky Business - 2 views

  •  
    interesting report on the cost of climate change for the US ... coming from Bloomberg and financed by him might not give it its utmost credibility but still
Athanasia Nikolaou

New greenhouse effect - H2 and N2 do not absorb radiation on their own, but at high con... - 2 views

  •  
    A new mechanism was discovered on how H2 and N2 participate in the radiation budget. This may help to resolve the "faint young sun paradox", a hypothesis according to which during the earlier age of the solar system when sun radiation had lower intensity than now, the earth was warmer.

    Extended, it could reassess the past habitability of Mars.
Athanasia Nikolaou

Interview with an IPCC leading author - 2 views

  •  
    CliSAP: Mr. Held, several hundred researchers worked for several years on preparing the recently published third part of the Assessment Report, without pay and on top of their normal duties. The result was a work over two thousand pages long. Was it worth it?

    An overview of the uncertainties when it comes to estimating investments in low carbon. Maybe there is room for computational management projects in there?
Thijs Versloot

New UN Climate Report published #IPCC - 0 views

  •  
    .. We're doomed ...
  •  
    Most likely
Athanasia Nikolaou

The weather of 2013 bucked in an 8' video - 0 views

  •  
    Very comprehensive thanks to the narrator from EUMETSAT training office (plus aesthetically pleasing)
Athanasia Nikolaou

Spray cyanobacteria on the desert to halt its spread - 2 views

  •  
    A wide scale 8 year experiment in China on combating desertification seems to have been successful. Instead of using cyanobacteria blooms in the sea, the tested method proposes to spray them on the boundaries of desert/farmland every few days, so that the carbon they capture stays on the ground. It is useful in fixing the organic material against wind erosion only complementary to planting hardy grasses.

    Very fast result, nevertheless. Could be classified as a geoengineering activity.
  •  
    130 km2 as next step will be quite an area
Athanasia Nikolaou

Aquifer discovered enclosed in Greenland ice sheet - 2 views

  •  
    As the researchers desribe, the aquifer found is defined as a basin filled with aged snow (firn) that was saturated with water trapped within its porous structure.

    More ice cores to study! But in that case the time sequence along the length of the cores - to be extracted- would not be monotonic, as was the case in the dry cores we analysed. That's because there is constant input of surface water percolating through the ice-sheet to reach the depth of the aquifer, and since it flows downward its temperature could affect its partial pressure => its vertical position along the core
Dario Izzo

Extreme weather events study - 2 views

  •  
    Is this correct? The conclusions indicate that contrary to what felt extreme weather events are not increasing?? Where is the trick?
  •  
    don't get fooled, this is the same strategy employed successfully by the tabac industry: installing doubt - all under the cover of science of course and using its methods; remember all these publications showing the overall beneficial effects of smoking, the "un-clear" link to lung cancer etc ... same here
Athanasia Nikolaou

Nature Paper: Rivers and streams release more CO2 than previously believed - 6 views

  •  
    Another underestimated source of CO2, are turbulent waters. "The stronger the turbulences at the water's surface, the more CO2 is released into the atmosphere. The combination of maps and data revealed that, while the CO2 emissions from lakes and reservoirs are lower than assumed, those from rivers and streams are three times as high as previously believed." Alltogether the emitted CO2 equates to roughly one-fifth of the emissions caused by humans. Yet more stuff to model...
  • ...10 more comments...
  •  
    This could also be a mechanism to counter human CO2 emission ... the more we emit, the less turbulent rivers and stream, the less CO2 is emitted there ... makes sense?
  •  
    I guess there is a natural equilibrium there. Once the climate warms up enough for all rivers and streams to evaporate they will not contribute CO2 anymore - which stops their contribution to global warming. So the problem is also the solution (as always).
  •  
    "The source of inland water CO2 is still not known with certainty and new studies are needed to research the mechanisms controlling CO2 evasion globally." It is another source of CO2 this one, and the turbulence in the rivers is independent of our emissions in CO2 and just facilitates the process of releasing CO2 waters. Dario, if I understood correct you have in mind a finite quantity of CO2 that the atmosphere can accomodate, and to my knowledge this does not happen, so I cannot find a relevant feedback there.

    Johannes, H2O is a powerful greenhouse gas :-)
  •  
    Nasia I think you did not get my point (a joke, really, that Johannes continued) .... by emitting more CO2 we warm up the planet thus drying up rivers and lakes which will, in turn emit less CO2 :) No finite quantity of CO2 in the atmosphere is needed to close this loop ...

    ... as for the H2O it could just go into non turbulent waters rather than staying into the atmosphere ...
  •  
    Really awkward joke explanation: I got the joke of Johannes, but maybe you did not get mine: by warming up the planet to get rid of the rivers and their problems, the water of the rivers will be accomodated in the atmosphere, therefore, the greenhouse gas of water.
  •  
    from my previous post:

    "... as for the H2O it could just go into non turbulent waters rather than staying into the atmosphere ..."
  •  
    I guess the emphasis is on "could"... ;-)
    Also, everybody knows that rain is cold - so more water in the atmosphere makes the climate colder.
  •  
    do you have the nature paper also? looks like very nice, meticulous typically german research lasting over 10 years with painstakingly many researchers from all over the world involved .... and while important the total is still only 20% of human emissions ... so a variation in it does not seem to change the overall picture
  •  
    here is the nature paper :
    http://www.nature.com/nature/journal/v503/n7476/full/nature12760.html

    I appreciate Johannes' and Dario's jokes, since climate is the common ground that all of us can have an opinion, taking honours from experiencing weather. But, the same as if I am trying to make jokes for material science, or A.I. I take a high risk of failing(!) :-S Water is a greenhouse gas, rain rather releases latent heat to the environment in order to be formed, Johannes, nice trolling effort ;-)

    Between this and the next jokes to come, I would stop to take a look here, provided you have 10 minutes: how/where rain forms
    http://www.scribd.com/doc/58033704/Tephigrams-for-Dummies
  •  
    omg
  •  
    Nasia, I thought about your statement carefully - and I cannot agree with you. Water is not a greenhouse gas. It is instead a liquid. Also, I can't believe you keep feeding the troll! :-P
    But on a more topical note: I think it is an over-simplification to call water a greenhouse gas - water is one of the most important mechanisms in the way Earth handles heat input from the sun. The latent heat that you mention actually cools Earth: solar energy that would otherwise heat Earth's surface is ABSORBED as latent heat by water which consequently evaporates - the same water condenses into rain drops at high altitudes and releases this stored heat. In effect the water cycle is a mechanism of heat transport from low altitude to high altitude where the chance of infrared radiation escaping into space is much higher due to the much thinner layer of atmosphere above (including the smaller abundance of greenhouse gasses). Also, as I know you are well aware, the cloud cover that results from water condensation in the troposphere dramatically increases albedo which has a cooling effect on climate. Furthermore the heat capacity of wet air ("humid heat") is much larger than that of dry air - so any advective heat transfer due to air currents is more efficient in wet air - transporting heat from warm areas to a natural heat sink e.g. polar regions.
    Of course there are also climate heating effects of water like the absorption of IR radiation. But I stand by my statement (as defended in the above) that rain cools the atmosphere.
    Oh and also some nice reading material on the complexities related to climate feedback due to sea surface temperature: http://journals.ametsoc.org/doi/abs/10.1175/1520-0442(1993)006%3C2049%3ALSEOTR%3E2.0.CO%3B2
  •  
    I enjoy trolling conversations when there is a gain for both sides at the end :-) .

    I had to check upon some of the facts in order to explain my self properly. The IPCC report states the greenhouse gases here, and water vapour is included:
    http://www.ipcc.ch/publications_and_data/ar4/wg1/en/faq-2-1.html

    Honestly, I read only the abstract of the article you posted, which is a very interesting hypothesis on the mechanism of regulating sea surface temperature, but it is very localized to the tropics (vivid convection, storms) a region of which I have very little expertise, and is difficult to study because it has non-hydrostatic dynamics. The only thing I can comment there is that the authors define constant relative humidity for the bottom layer, supplied by the oceanic surface, which limits the implementation of the concept on other earth regions.

    Also, we may confuse during the conversation the greenhouse gas with the Radiative Forcing of each greenhouse gas: I see your point of the latent heat trapped in the water vapour, and I agree, but the effect of the water is that it traps even as latent heat an amount of LR that would otherwise escape back to space. That is the greenhouse gas identity

    and an image to see the absorption bands in the atmosphere and how important the water is, without vain authority-based arguments that miss the explanation in the end:

    http://www.google.nl/imgres?imgurl=http://www.solarchords.com/uploaded/82/87-33833-450015_44absorbspec.gif&imgrefurl=http://www.solarchords.com/agw-science/4/greenhouse--1-radiation/33784/&h=468&w=458&sz=28&tbnid=x2NtfKh5OPM7lM:&tbnh=98&tbnw=96&zoom=1&usg=__KldteWbV19nVPbbsC4jsOgzCK6E=&docid=cMRZ9f22jbtYPM&sa=X&ei=SwynUq2TMqiS0QXVq4C4Aw&ved=0CDkQ9QEwAw
Athanasia Nikolaou

The tipping elements in the climate system - 2 views

  •  
    Putting together the picture of how climate works. An informative slide that shows which are the climatic subsystems that can undergo(/have undergone in the past) bifurcations (Lenton et al., 2008 PNAS).
Athanasia Nikolaou

Study finds link between the atmospheric rivers and climate - 1 views

  •  
    Atmospheric rivers, short-lived wind tunnels are created in the upper troposphere and carry vast amounts of water. They 'fuel' from the tropical Pacific reservoir and cause heavy precipitation events and even floods to mid-latitude land, as soon as they encounter the Sierra mountains. The new finding is that two inter-hemispheric climatic oscillation modes allow for their creation, as soon as they are found in a certain phase combination.
  •  
    Could we conceivably control these like we're thinking to do with taifuns? :))
    Would be geoengineering at its finest
johannessimon81

Oxygen may have appeared in Earth's atmosphere 700 million years earlier than previousl... - 1 views

  •  
    Indicators found in 3 billion year old rocks
1 - 20 of 69 Next › Last »
Showing 20 items per page