Archive for 2013
identi.ca updates
- RT @modernscientist: Woah! RT @PhilippBayer: Mathematica will be bundled with Raspbian, for free! http://t.co/1OYZDhZX4H 2013-11-22
identi.ca updates
- ample room for improvement, but cool concept: Monte Carlo with #Lego in laundry machine: http://t.co/WlGWKp36B0 2013-11-20
identi.ca updates
- RT @Riotbuddha: Diese Windräder verschandeln uns die ganze Landschaft. (oben rechts) http://t.co/0im6WSkr15 2013-11-08
- RT @EricHolthaus: Super Typhoon #YolandaPH is officially off the charts. http://t.co/XGWeFv3GAJ 2013-11-08
- #climate #history stored in #boreholes – saw talk recently; get ready for #COP19 http://t.co/L9oeJHOT4g http://t.co/zI6AM0zUfJ 2013-11-10
- finally: some #stats on hard drive disk failures: http://t.co/6GlQedEXqY 2013-11-14
Climate Change Records Stored in Boreholes
The UN framework convention on climate change will start tomorrow in Warsaw, Poland. By chance, but fitting to the occasion, I heard a talk on friday given by David Chapman from the University of Utah.
He opened his talk with a remarkable chart, shown below:
This chart shows the thermal gradient measured in multiple boreholes (labelled ETK, FCK, TUL, etc.) that were drilled in northern Alaska. At depth, ranging from about 125m to 175m bgs., temperature increases linearly with increasing depth. However, for shallower depths between about 70m to 100m bgs, there is a deviation from the linear slope recognizable, indicated by the grey shaded areas. The authors found that the deviation from the expected temperature gradient is a few degrees warmer (between 2.2C and 7.4C) in the last 100 years or so.
What a great “reservoir” the earth is! The chart above is from this paper:
Lachenbruch, Arthur H, and B Vaughn Marshall. 1986. “Changing Climate: Geothermal Evidence From Permafrost in the Alaskan Arctic.” Science 234 (4777) (November 7): 689–696. doi:10.1126/science.234.4777.689.
Note that this was published about one year before Hansen’s and Lebedeff’s land-mark paper. Based on Lachenbruch’s and Marshall’s work work, Chapman continued to do related work, particularly with meteorological measurements, in the west of Utah.
identi.ca updates
- RT @hukl: Binary trees – they really exist!! http://t.co/aQOIpDj8ne (via @IAmMarth) 2013-11-06
- RT @Earth_Pics: Sand under a microscope with 250x magnification. http://t.co/7tXhWxjwLD 2013-11-06
- RT @lintool: When I see this, I think: what an optimization nightmare… too many local minima http://t.co/dlP12KkRun 2013-11-07
identi.ca updates
- Via @zenrainman @WaterWired Srikakulam, India: new rainfall record,receives 1263 mm in 6 days. http://t.co/rfPFg2xPef @TheHindu 2013-10-29
identi.ca updates
- this is awesome! RT @danielhfrank: @wesmckinn use heapq.nlargest in a pinch? Agree that a NumPy version would be good to have though 2013-10-21
- RT @EricHolthaus @NOAA #extreme precip in Bolder, CO: rare event on multiple time scales http://t.co/3sYL5dACUi (1/2) http://t.co/P7p7yvs0Jk 2013-10-24
identi.ca updates
- #coffee #experiments with interesting #statistical evaluation: http://t.co/JQvHtNStoa 2013-10-06
identi.ca updates
- RT @WMOnews: Tnx @duycks for tweeting our graph classifying 150+ yrs hottest to coldest. #IPCC #AR5 http://t.co/PiwJ6NMMGN http://t.co/ALn… 2013-09-27
- RT @WMOnews: #IPCC #AR5 physical science of #climate change report: 259 authors, 39 countries, 54,677 comments Check out the facts http://t… 2013-09-27
- RT @JPvanYpersele: #AR5 SPM should be on http://t.co/lnAc7J8yz9 at 10am Stockholm time. Monday: underlying report (not copy-edited, but wit… 2013-09-27
identi.ca updates
- meine auch! RT @bicyclist: möchte meine Timeline vorwarnen, dass ab Morgen früh mit vermehrtem Barcamp Tweet aufkommen zu rechnen ist. #bcs6 2013-09-20
- #bcs6 – Es gibt eine Möglichkeit, um morgen günstig ÖPNV zu fahren: http://t.co/7zRVSRHs7p 2013-09-20