Tuesday, November 24, 2015
Sunday, November 22, 2015
ATTP and Eli have been exploring the carbon cycle, with a few simple, but illustrative models. ATTP's attention was drawn to a recent submission to Earth System Dynamics A simple model of the anthropogenically forced CO2 cycle by Weber, Lüdeke and Weiss, which is not even wrong, worse, it is misleading. Hans Joachim Lüdeke, the S. Fred Singer of the German denialist set seems to be making a retirement project of such things. If you doubt your friendly bunny and Eli knows none of the readers of Rabett Run would stoop so low, there is this comment from Neven about an earlier attempt at misdirection by Herr Lüdeke-Singer
I do not dismiss them because they belong to a certain political group. I dismiss them because I have seen them lie and distort repeatedly, and never be right about anything, and never retract allegations, and never admit or correct mistakes.and this analysis of the attempt (published in E&E and Int J. Mod Phys B, who would have guessed, not Eli to be sure), by Richard Tol during one of his rational periods. Tol points out that
Lüdeke concludes that there is no trend in the global temperature record of the past century or so, after he removed the trend by So far so good. Unfortunately, fluctuation analysis does not work on trending variables. Therefore, LLE use DETRENDED fluctuation analysis. That is, they first fit a polynomial of order two to the data, remove this trend, and study the deviations from the trend.
Having removed the trend from their data, LLE cannot answer the question: What caused the warming? They eliminated from their analysis the very thing in which they are interested.This trick, of course is one of Tamino's top ten on this list of statistical flim flam but there is a lot more.
The abstract of the Weber paper claims that
From basic physical assumptions we derive a simple linear model of the global CO2 cycle without free parameters. It yields excellent agreement with the observations reported by the carbon dioxide information analysis center (CDIAC) as time series of atmospheric CO2 growth, of sinks in the ocean and of absorption by the biosphere. The agreement extends from the year 1850 until present (2013). Based on anthropogenic CO2 ; emission scenarios until 2150, future atmospheric CO2 concentrations are calculated. As the model shows, and depending on the emission scenario, the airborne fraction of CO2 begins to decrease in the year ∼ 2050 and becomes negative at the latest in ∼ 2130. At the same time the concentration of the atmospheric CO2 will reach a maximum between ∼ 500 and ∼ 900 ppm. As a consequence, increasing anthropogenic CO2 emissions will make the ocean and the biosphere the main reservoirs of anthropogenic CO2 in the long run. Latest in about 150 years, anthropogenic CO2 emission will no longer increase the CO2 content of atmosphere.Now some, not Eli to be sure, might fight their war through the mathturbation, including a freshman level reprise of Euler's method for solving a simple differential equation. Eli is a visual bunny and he always looks at the figures first. His attention was drawn to Figure 5b, which purported to show the response of the atmosphere to a pulse of CO2
The Weber model fails because it does not consider reverse interchanges from the biosphere and the surface ocean into the atmosphere. According to Weber, et al the adjustment time is 100 years and the grey shaded regions are the responses of 15 models considered by Joos et al., 2013. One immediately notices that their atmospheric CO2 concentration declines rapidly to zero. This is possible for sequential reactions, a --> b + s but not for opposing reactions (a = b and a = s) where there are both forward and backwards reactions. A simple, straightforward kinetic model for the flow of carbon between the three reservoirs would be
Where kxy is the rate constant for moving carbon from reservoir x to y and Nx is the amount of carbon in reservoir x. n is the CO2 injected into the atmosphere at time t. If No is the total amount of CO2 in the system, at equilibrium where a steady state approximation can be applied (in other words set each of the derivatives to zero because the concentrations are not changing, the system is in equilibrium)
By inspection Weber et al’s result can only be obtained if the rate constants for transfer between the biosphere, kba, and surface ocean, ksa, to the atmosphere are zero. Nope
And then there is physics and chemistry. Even if one denies the analysis of the carbon cycle as shown above, if, as Weber, et al, claim, all of the excess carbon injected into the atmosphere is totally sequestered into biological materials after a hundred years or so, for it to stay there as required by their analysis would mean that decomposition of biological materials would not be increased by the increased amount of material. Similarly for excess CO2 sequestered in the surface oceans. If the partial pressure of CO2 in the surface ocean is increased physics requires that the out gassing of the surface ocean would be increased.
Finally, if Weber et al, are going to try and claim that they were talking about a rapid descent of the atmospheric carbon dioxide into the deep oceans, well, there is a lot of information about that interchange, and one of the reviewers, Fortunat Joos, buries that one
Can transport processes within the ocean be approximated with a single time scale? There is the GLODAP data base on CDIAC which includes CFCs and radiocarbon data sampled over the pastdecades (Key et al., 2004). These data show that mixing time scales for the upper thermocline are decadal and mixing time scales for the deep ocean are multi-centennial. The lowest radiocarbon ratios of dissolved inorganic carbon are found in the deep Pacific with values that are about 240 permil or so lower than the atmosphere or about 200 permil lower compared to the surface ocean. This corresponds to a water age of roughly 1800 years.
Posted by EliRabett at 8:02 PM
Wednesday, November 18, 2015
Last summer I took the World Bank MOOC course on climate change in Spanish (it will be offered again next year in both English and Spanish). My final presentation was on using shallow aquifers to mitigate and adapt for climate change.
Posted by Brian at 8:57 AM
Tuesday, November 17, 2015
The agenda of fear and hate driving conservative candidates for president today is the last thing we should do. So what to do, instead. There's Duncan Black on one side saying, do less blowing up. Kind of vague, but not meaningless. Josh Marshall on the other hand says do more blowing up of ISIS (also stop blowing up Assad, but the main thing is blow up ISIS).
I'm somewhere in between but think I'd lean more towards the pretentious one's argument. Many people have reminded Republicans that it was their invasion of Iraq that put us in this fine mess. Less remarked is that ISIS talked a big game in the caliphate's first year, but pretty much concentrated on local genocide, rape, and enslavement - we were blowing them up first before they got to Paris. Maybe people don't make this argument because of the whole genocide thing - the pretentious Duncan sure glosses over that.
I'm no expert but I read history, and in World War II neither side liked getting bombed, making efforts to retaliate more for domestic consumption than out of real strategy. From the Doolittle Raid to the V-2, the motivation basically was to strike back.
Duncan's right that blowing up ISIS creates problems, although not blowing them up in some situations allows them to create genocide. So I'd say do more blowing up when needed to stop genocide despite the risk of retaliation, but getting rid of ISIS where it has some popular support isn't our job. Especially in Iraq, the campaign in Anbar province might be going too well - the Iraqi Shiite government is succeeding in taking over Sunni areas without real Sunni participation. That sounds like a recipe for future problems, and not where the rest of the world needs to tread.
Syria is a bit different, Sunnis are fighting both ISIS and Assad. I once favored a safe zone in the northwest, assuming Turkey's government would be less-than-evil about who got through. I don't know if that could still happen - maybe. Containing ISIS while locals figure out how to handle them seems like a better approach, and it would mean less bombing than we're doing now. Maybe that would work, like Duncan says. Working with Assad would be a huge mistake and again not where the rest of the world needs to tread.
Paris was a tragedy. There are many other tragedies. Let's make things better instead of worse.
Posted by Brian at 11:27 PM
Sometimes there are odd thoughts that surge through Eli's brain. Recently he was reading about a concentrated solar power plant the first phase of which had opened in Morocco. Noor 1 will generate 160 Megwatt. When completed, the four phase project will generate almost 500 megawatts, of course, when the sun shines, which it pretty much does all day in Ourazazate.
What is particularly interesting about this plant is that the design can source power for three hours after the sun sets, because the working fluid (an oil mixture) can be used to store thermal energy in a reservoir, and the temperature in the reservoir is high enough to drive steam turbines for up to three hours after sunset. Moreover, substituting salts which change their phase as they cool can provide even more energy, or the same energy for a longer time.
The characteristic of solar and wind is that when you have sun and wind you have more power than you need. When you don't you have nothing. The general idea is at least for small installations like houses, to bridge with batteries.
A long time ago, on sci.environment Eli, the Weasel, MT and others engaged with John McCarthy of LISP. McCarthy was a cornucopian, and if you carefully went through his thoughts, they all came down to the price of energy being zero.
Couple super-efficient insulation, the heat storage of phase change salts, resistors to convert waste electricity generated by wind and solar to heat and then use photothermal generators to convert the heat back to electricity when needed. Of course, you could always use the heat directly to warm the house or cook the carrots. The best (e.g. lab) thermoelectric materials can have efficiencies of 10-20% and nanopatterning can improve the transfer efficiency. Just an idea.
Posted by EliRabett at 6:42 PM
Monday, November 16, 2015
It is getting warm out there and the El Nino is showing no signs of slowing down. The Japan Meteorological Agency has a tool which shows the average monthly temperature in each month from 1890 to today. Eli has turned this into an animated gif using imgflp. Starting in November of 2014 until October 2015
Posted by EliRabett at 6:44 PM
Sunday, November 15, 2015
Eli was perusing the tweets and came across a back and forth that involved ATTP and a churnalist know it all by the name of Peter Hitchens. Well no matter, you can read about that at ATTP, but amongst the drivel was a useful pointer by Willard, no not that useless scumbag Willard Tony, but Willard
Your claim is more than falsifiable - it's false, @ClarkeMicah: https://t.co/X6oUlYpGSv You're welcome, @robinince & @DaveJSixsmith— willard (@nevaudit) November 15, 2015
If there are any ‘climate change skeptics’ who want to contribute to real science, they might see this as a challenge. Maybe they can come up with a research proposal, based on one of the options for falsification. Like proper scientists would do.and then lowering the boom
If someone at an oil company only had the slightest doubt such a challenge might be possible, he had already funded this research. If every visitor to WUWT would pay one cent, they could hire a good scientist. That they rather fund PR firms and write daily erroneous posts shows that even they know the AGW is solid.
Posted by EliRabett at 3:32 PM
Friday, November 13, 2015
Ce soir c'est le moment de la douleur, des pleurs, du deuil, mais Paris est là, debout. Je sais que les Parisiens, qui vont souffrir avec ceux qui sont tombés ce soir, sauront aussi se relever pour être d'abord aux côtés des victimes, et pour montrer que cette liberté, cette liberté qu'il y a dans notre ville, cette joie de vivre qu'il y a dans notre ville, ils ne l'atteindront pas - Ann Hidalgo, Mayor of Paris
This night is a time of pain and mourning ... but Paris is still here and standing. ... The freedom, the joyful life that fills this city, [the attackers] have not touched that.
Posted by EliRabett at 7:31 PM