Climate and Weather
gregladen | March 19, 2008During Earth Hour, you switch off the lights and other non-essential electronic devices. At 8:00 PM March 29th. You'll save electricity, but more importantly, you'll be making a point.
Created to take a stand against the greatest threat our planet has ever faced, Earth Hour uses the simple action of turning off the lights for one hour to deliver a powerful message about the need for action on global warming.
This simple act has captured the hearts and minds of people all over the world. As a result, at 8pm March 29, 2008 millions of people in some of the world's major capital cities,…
gregladen | February 18, 2008Charles Darwin wrote a book called Geological Observations on South America. Since Fitzroy needed to carry out intensive and extensive coastal mapping in South America, and Darwin was, at heart, a geologist more than anything else (at least during the Beagle's voyage), this meant that Darwin would become the world's expert on South American geology. Much of The Voyage is about his expeditions and observations. Part of this, of course, was figuring out the paleontology of the region.
Bahia Blanca is a port at the northern end of Patagonia. Chapter V of The Voyage begins:
THE Beagle…
gregladen | January 24, 2008The amount of ice lost to the sea from Antarctica has increased by 75 percent in the last 10 years. This is the result of an increase in glacial flow. It had previously been thought, and perhas was the case, that Greenland ice loss outpaced the Antarctica. This is no longer the case.
An article coming out in the next issue of Nature Geoscience, by Rignot et al ("Recent Antarctic ice mass loss from radar interferometry and regional climate modelling") is the most detailed study of this phenomenon to date.
There are two factors that affect the flow of ice into the sea at the edge of the…
gregladen | January 17, 2008Things are just not like what they used to be. You know this. You know that the Age of Dinosaurs, for instance, was full of dinosaurs and stuff, and before transitional fossil forms crawled out of the sea to colonize the land, all animals were aquatic, etc. But did you know that from a purely modern perspective, the Miocene was the most important geological period?
First, lets get one thing straight. We are not in the so-called "Holocene." The so-called "Holocene" is a totally bogus geological period. Saying "Hey, we're in the Holocene, not the Pleistocene ... the Pleistocene is over…
gregladen | January 8, 2008Pumice is rock that is ejected from a volcano, and has so much gas trapped in it that it can float. So when a pumice-ejecting volcano (not all volcanoes produce pumice) goes off near a body of water, you can get a raft of rock floating around for quite some time. By and by, water replaces the gas within the rock and it sinks. Like a rock. So, you can get layers of pumice on the bed of lakes, seas and oceans. A forthcoming paper in Deep Sea Research I describes two such pumice deposits of "Drift Pumice" in the Indian Ocean.
The fact that the two deposits are more or less on the surface of…
gregladen | December 19, 2007Popular Mechanics (one of those magazines that genteel people refuse to admit they read, but that is actually a blast) has published a thing called "Geek the Vote." According to an email from PM, this is:
...an online guide to all the candidates' stances on issues related to science and technology including energy policy and climate change, gun control, science education and infrastructure investment. The full chart, which can be navigated by candidate or issue, is [provided]
The site is here.
This is apparently in response to (maybe not, but there is evidence to suggest this) the Science…
gregladen | December 17, 2007The Cost of twenty years of Reagan and Bushes has been very high. In about 1991, I wrote an article for a monthly newspaper in which I summarized the available data for Global Warming, and was very easily able to conclude that it was a real phenomenon with consequences already felt in a number of areas, a reasonably well understood mechanism, and a tangible set of solutions to work on. In 1997, the Kyoto protocol was signed on to by a number of nations (the US not included because of congressional Republican opposition). This month, in Bali, a re-run of something like Kyoto happened, and…
gregladen | December 10, 2007Sort of. The hurricane that the press ignored until it was impossible to ignore is now listed on Time's Top Ten Natural Disasters of 2007.
I don't like the sound of that at all: "Top Ten Natural Disasters." Maybe I'm used to "top ten" being good things. Maybe that's just me.
Packing winds of over 100 mph, the storm took out power lines and trees, and pulverized mud and thatch homes. The death toll was over 1,000, with more than half a million people forced to flee their homes. But by Bangladesh's sad standards, Sidr was nothing -- a cyclone in 1991 killed an astounding 140,000 people.…
gregladen | November 17, 2007A few tidbits -- just to give a flavor -- from the Summary for Policymakers, which is available here. (Good luck downloading this file! You may want to wait until everyone is asleep...)
1. Observed changes in climate and their effects
Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level
...
There is observational evidence of an increase in intense tropical cyclone activity in the North Atlantic since about
1970, with limited evidence…