Tuesday, February 28, 2012

Clouds Descending .....?



Earth’s clouds descended a little — about one percent on average — during last decade, finds a new NASA-funded university study based on NASA satellite data.
 The results have potential implications for future global climate.


Decreasing global cloud heights suggest negative feedback over the last decade
Data from NASA's MISR instrument on NASA's Terra spacecraft show that global average cloud height declined by about 1 percent over the decade from 2000 to 2010, or around 100 to 130 feet (30 to 40 meters). (Image credit: University of Auckland/NASA JPL-Caltech)
Data from NASA's MISR instrument on NASA's Terra spacecraft show that global average cloud height declined by about 1 percent over the decade from 2000 to 2010, or around 100 to 130 feet (30 to 40 meters). (Image credit: University of Auckland/NASA JPL-Caltech)
The study was recently published in GRL.
Global cloud height fluctuations measured by MISR on Terra from 2000 to 2010
Roger Davies & Matthew Molloy
http://www.agu.org/pubs/crossref/2012/2011GL050506.shtml

Read Reports:
http://www.popsci.com/science/article/2012-02/earths-clouds-are-sinking-and-could-help-cool-planet
http://www.clarksvilleonline.com/2012/02/22/nasa-satellite-finds-earths-clouds-are-getting-lower/

Monday, February 27, 2012

National Science Day- Feb 28

National Science Day is celebrated in India on February 28 every year to celebrate  the discovery of Raman effect by C.V. Raman. 
The event is commemorated in honour of Sir C.V. Raman for his legacy and discovery of the Raman Effect on February 28, 1927, for which he was awarded the Nobel Prize in 1930.
The Raman Effect led to the growth of a new discipline, Raman Spectroscopy, which has now become a powerful tool for a wide range of scientific investigations and industrial applications.
 Celebration of National Science Day began from 1986.


Theme 2012: Clean ENergy Options & Nuclear Safety.
http://www.nscdelhi.org/inauguration-science.php?event_id=302





Importance of Feb. 28
On February 28 1928, Sir C.V. Raman announced the discovery of the Raman Effect. 
Sir C.V RAMAN

Friday, February 24, 2012

can Rainfall calm Storms...?

Atmospheric scientists have found that Rainfall is able to calm the convectively unstable atmosphere....!

They calculate that a substantial portion of the energy that drives wind and air circulation in the atmosphere is dissipated as friction by raindrops falling through the air.

Some of the dissipation of mechanical energy happens when a falling raindrop (or snowflake or hailstone) experiences friction as it passes through the surrounding air.

Read more: http://www.nature.com/news/rainfall-calms-storms-1.10100

Wednesday, February 22, 2012

Global Tree Height prepared.

NASA produces Global map of forest height using ICESat.

The map will help scientists better understand the role forests play in climate change and how their heights influence wildlife habitats within them, while also helping them quantify the carbon stored in Earth's vegetation.

Global map of forest height
Click on the image to Zoom


The map, available at http://lidarradar.jpl.nasa.gov, depicts the highest points in the forest canopy. Its spatial resolution is 0.6 miles (1 kilometer).

Courtesy: http://www.nasa.gov/topics/earth/features/forest20120217.html

Sunday, February 12, 2012

Visualize Scale sizes...

Here is an interesting and  informative interactive information on the scale sizes......

http://images.4channel.org/f/src/589217_scale_of_universe_enhanced.swf

from ultra small quarks to ultra big universe.....