A place for my geography-geek side to let loose.

My regular page is: solipsismnow.tumblr.com

 

earthstory:

Great time lapse of the formation of some of the Noctilucent clouds that I shared photos of in late July.

maptacular:

Newly-Analyzed Maps Reveal Exact Locations of Historic Events
“More than 3,000 maps of cities, battles and landscapes—representing a millennium of history—have been georeferenced by the British Library. That means it’s now possible to see the precise locations of historic places and events in the context of today’s world.
The BL Georeferencer allows you to click on points across the globe, revealing multiple views using street maps, satellite maps or even 3D topography, by means of Google Earth. The result is a stunning interface, allowing you to see how cities have changed over time, or gain insights into the landscapes where famous battles were fought. A sliding toggle allows you to alter the map’s transparency.”
Via io9

maptacular:

Newly-Analyzed Maps Reveal Exact Locations of Historic Events

More than 3,000 maps of cities, battles and landscapes—representing a millennium of history—have been georeferenced by the British Library. That means it’s now possible to see the precise locations of historic places and events in the context of today’s world.

The BL Georeferencer allows you to click on points across the globe, revealing multiple views using street maps, satellite maps or even 3D topography, by means of Google Earth. The result is a stunning interface, allowing you to see how cities have changed over time, or gain insights into the landscapes where famous battles were fought. A sliding toggle allows you to alter the map’s transparency.”

Via io9

earthstory:

This video shows a video rendering of the progress of earthquakes around the active Bardarbunga volcanic complex in Iceland.

earthstory:

Rising temperatures are bringing the world’s northernmost lake back to life. In what has been described as “a pure climate change story”, Lake Kaffeklubben Sø near the cost of Greenland has become rejuvenated with microscopic algae called “diatoms”.The lake was formed about 3,500 years ago when glacial retreats created numerous small lakes on the coastal plain, at this time diatoms were abundant. As temperatures started to cool, the population of these algae decreased until about 2,400 years ago when they vanished completely.A layer of ice 1-2 metres thick covers the lake year round and blocks the passage of sunlight from allowing diatoms to grow. Now, however, a rise in summer temperatures has caused some of the ice to melt, particularly on the periphery of the lake- this has allowed enough sunlight to penetrate the waters and hence since the 1980s diatom populations have been increasing.To be confident that this population explosion could be attributed to increased temperatures, the research team allocated a large portion of the study to examine other possible scenarios. The main investigation was to determine was the surge in diatoms caused in part by nutrient enrichment; in the form of nitrogen pollution. There was no evidence of pollution, nitrogen or otherwise, found in Kaffeklubben Sø, suggesting that the current rise in diatom population is due to climate change alone.The study noted that the current diatom population in Kaffeklubben Sø is the highest in recent memory. This goes to show how sensitive ecosystems are to a changing climate.-Jean For those with access, the paper can be found here: http://geology.gsapubs.org/content/40/11/1003.full.pdf+htmlFor those who don’t, next best thing! : http://www.newscientist.com/article/dn22337-worlds-most-northerly-lake-comes-back-to-life.htmlPhotograph courtesy David Mazzucchi

earthstory:

Rising temperatures are bringing the world’s northernmost lake back to life. 

In what has been described as “a pure climate change story”, Lake Kaffeklubben Sø near the cost of Greenland has become rejuvenated with microscopic algae called “diatoms”.

The lake was formed about 3,500 years ago when glacial retreats created numerous small lakes on the coastal plain, at this time diatoms were abundant. As temperatures started to cool, the population of these algae decreased until about 2,400 years ago when they vanished completely.

A layer of ice 1-2 metres thick covers the lake year round and blocks the passage of sunlight from allowing diatoms to grow. 

Now, however, a rise in summer temperatures has caused some of the ice to melt, particularly on the periphery of the lake- this has allowed enough sunlight to penetrate the waters and hence since the 1980s diatom populations have been increasing.
To be confident that this population explosion could be attributed to increased temperatures, the research team allocated a large portion of the study to examine other possible scenarios. The main investigation was to determine was the surge in diatoms caused in part by nutrient enrichment; in the form of nitrogen pollution. There was no evidence of pollution, nitrogen or otherwise, found in Kaffeklubben Sø, suggesting that the current rise in diatom population is due to climate change alone.

The study noted that the current diatom population in Kaffeklubben Sø is the highest in recent memory. This goes to show how sensitive ecosystems are to a changing climate.

-Jean 


For those with access, the paper can be found here: http://geology.gsapubs.org/content/40/11/1003.full.pdf+html

For those who don’t, next best thing! : http://www.newscientist.com/article/dn22337-worlds-most-northerly-lake-comes-back-to-life.html

Photograph courtesy David Mazzucchi

mapsontheweb:


The 50 most and least densely populated counties in the USA
Read More

mapsontheweb:

The 50 most and least densely populated counties in the USA

Read More