Category Archives: astrophysics
No practice runs. Designed. Built. Worked first time out. That’s impressive.
Just hit the “arXiv streets”: N. Dalmasso, T. Pospisil, A. B. Lee, R. Izbicki, P. E. Freeman, A. I. Malz, “Conditional Density Estimation Tools in Python and R with applications to photometric redshifts and likelihood-free cosmological inference”, arXiv.org > astro-ph … Continue reading
I have been following, with keen interest, the post and comment thread pertaining to “Democratising science” at the blog I monitor daily, … and Then There’s Physics. I think the core subject being discussed is a little different from my … Continue reading
They want to shut down and defund DSCOVR: DSCOVR’s cameras are intended to monitor changes in earth’s climate and weather patterns, from ozone and aerosols to temperature and deforestation. One of the scientists involved in developing the satellite told Air … Continue reading
Like many, including Eli Rabett, I will be marching for Science in April, on Earth Day. My march will be part of the Boston march. Why? Because Science has been and is my life, and it always has been, and … Continue reading
From Katharine Hayhoe, who I deeply respect, and from John Cook (*), scientists and the quantitative community have been scolded that the reason they don’t make headway with the public and the science denier community is because their explanations are too … Continue reading
When knowledge conquered fear … And, what better way to celebrate than watching the National Geographic Cosmos episode, When knowledge conquered fear, hosted by the great Dr Neil deGrasse Tyson, Director of the Hayden Planetarium in New York City.
I have a foreboding of an America in my children’s or grandchildren’s time — when the United States is a service and information economy; when nearly all the manufacturing industries have slipped away to other countries; when awesome technological powers … Continue reading
(Image courtesy of the Damien Garcia.) As a statistician and quant, I’ve thought hard about that oft-cited Boxism. I’m not sure I agree. It’s not that there is such a thing as a perfect model, or correct model, whatever in … Continue reading
Hat tip to And then there’s Physics …: On climate change and Astrobiology , by Adam Frank.
Bill Nye hosts Dr Neil deGrasse Tyson‘s Star Talk Radio, featuring climate change and NASA’s Dr Gavin Schmidt. (See also RealClimate.)
The Bayesian blocks algorithm of Scargle, Jackson, Norris, and Chiang has an enthusiastic user community in astrostatistics, in data mining, and among some in machine learning. It is a dynamic programming algorithm (see VanderPlas referenced below) and, so, exhibits optimality … Continue reading
The previous post included an attempt to explain land surface temperatures as estimated by the BEST project using a dynamic linear model including regressions on both quarterly CO2 concentrations and ocean heat content. The idea was to check the explanatory … Continue reading
From time to time, I engage with science deniers on the Web, typically in Comment sections, and primarily regarding aspects of climate science or physics. Some think this to be a waste of time, but, as I enjoy debating (have … Continue reading
From this post: There is a cute little number called Loschmidt, the number of molecules in a cubic meter of air at 1 atm and 0° C, 2.6867774(47) x 1025 molecules/m3 … Eli Rabett provides a neat way to see … Continue reading
See the very interesting discussion at his blog, From the bottom of the heap. It would be nice to see some information theoretic measures on these results, though.
(Click image for an astonishingly wonderful large photo. Use browser Back button to return.) It’s just Earth. And Earth will be okay, completely fine, with or without us. As will the biosphere, our companions. It cannot be worse than the … Continue reading
Some celestial event. No – no words. No words to describe it. Poetry! They should’ve sent a poet. So beautiful. So beautiful… I had no idea. (From Carl Sagan’s Contact, the movie version.) Hat tip to Climate Denial Crock of … Continue reading
Admiral David Titley (USN, retired), oceanographer, on climate models and satellite temperature data
(Hat tip to Peter Sinclair’s Climate Denial Crock of the Week.) More: Still more: And a 22 minute lecture at TEDx Pentagon:
Compassion, yes. Love, no.
Click the image above to see a video from the GFDL CM2.6 climate model. This is NOT this year’s El Nino. When you start a climate model in which the ocean and the land and atmosphere can inte… Source: El … Continue reading
Good to review the basics once again. Professors Dave Archer and Ray Pierrehumbert do, in my opinion, some of the best introductions: Infrared radiation and planetary temperature.
Hat tip to Peter Sinclair who let us all know about this symposium on his blog. The link is supposed to start at Dr John Holdren’s talk, but in case it does not, his talk begins at 35:00 into the … Continue reading
Eli condenses the problem with the Carbon Cycle and excessive emissions of fossil fuel CO2 to a few paragraphs, a great figure, and a trio of linear differential equations.
28th October 1956, The New York Times. Andy Dessler at TAMU Physics Department seminar, 24the September 2015.
Here’s how we adapt.
I have made my comments at The Times news article on the subject. If I, as a youngster, brought my Newtonian telescope lens-in-progress into school, and because it looked like it was wrapped in putty, would I, in this day, … Continue reading
Of course, from XKCD. (Click image to see bigger picture. Hat tip to Carl Safina for the joke.)
“A very short history of climate change research“, by Alice Bell. The story of scientists discovering climate change is longer than many of us tend to imagine. We’ve had a sense that what humans do might effect the climate since … Continue reading
“There is such a thing as being too late.”