Home
News
In Focus
Business
Metro
Nation
World
Sports
Feature
Opinion
View more 禄Opinion Columns
Wan LixinOpinion deputy editor of Shanghai Daily
City-born architect lists inspiration behind his designs in a new book
Digitization helps preserve, disseminate intangible cultural heritage
Sunday
- Subscribe
Related News
It's raining cats and bacteria
May 18, 2009, Monday
|
Print Edition
Print Edition
Ice crystals plucked from clouds and analyzed in flight show bits of biological material - bacteria, spores and plants - play a role in the formation of clouds, American researchers said yesterday.
The finding, reported in the journal Nature Geoscience, offers the first direct evidence of airborne bacteria in clouds, they said.
Climate scientists typically rely on computer models to predict climate change, but until now it has been difficult to directly measure the composition of ice crystals in clouds, which are the very seeds that form clouds.
"By sampling clouds in real time from an aircraft, these investigators were able to get information about ice particles in clouds at an unprecedented level of detail," said Anne-Marie Schmoltner of the National Science Foundation's Division of Atmospheric sciences.
"By determining the chemical composition of the very cores of individual ice particles, they discovered that both mineral dust and, surprisingly, biological particles play a major role in the formation of clouds."
"The key to cloud formation is these little seeds that feed the clouds," said Kim Prather of Scripps Institution of Oceanography. "We are basically trying to understand what is forming clouds."
The team, led by Prather's graduate student Kerri Pratt, found that biological matter accounted for 33 percent of the particles in ice crystals, and mineral dust accounted for 50 percent.
The finding, reported in the journal Nature Geoscience, offers the first direct evidence of airborne bacteria in clouds, they said.
Climate scientists typically rely on computer models to predict climate change, but until now it has been difficult to directly measure the composition of ice crystals in clouds, which are the very seeds that form clouds.
"By sampling clouds in real time from an aircraft, these investigators were able to get information about ice particles in clouds at an unprecedented level of detail," said Anne-Marie Schmoltner of the National Science Foundation's Division of Atmospheric sciences.
"By determining the chemical composition of the very cores of individual ice particles, they discovered that both mineral dust and, surprisingly, biological particles play a major role in the formation of clouds."
"The key to cloud formation is these little seeds that feed the clouds," said Kim Prather of Scripps Institution of Oceanography. "We are basically trying to understand what is forming clouds."
The team, led by Prather's graduate student Kerri Pratt, found that biological matter accounted for 33 percent of the particles in ice crystals, and mineral dust accounted for 50 percent.
- About Us
- |
- Terms of Use
- |
-
RSS - |
- Privacy Policy
- |
- Contact Us
- |
- Shanghai Call Center: 962288
- |
- Tip-off hotline: 52920043
- 娌狪CP璇侊細娌狪CP澶05050403鍙-1
- |
- 浜掕仈缃戞柊闂讳俊鎭湇鍔¤鍙瘉锛31120180004
- |
- 缃戠粶瑙嗗惉璁稿彲璇侊細0909346
- |
- 骞挎挱鐢佃鑺傜洰鍒朵綔璁稿彲璇侊細娌瓧绗354鍙
- |
- 澧炲肩數淇′笟鍔＄粡钀ヨ鍙瘉锛氭勃B2-20120012
Copyright 漏 1999- Shanghai Daily. All rights reserved.Preferably viewed with Internet Explorer 8 or newer browsers.
