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Detecting clear trend in water vapor would take 50 years, say scientists.

Byline: ANI

Washington, October 27 (ANI): A new study by scientists has determined that it would take about 50 years of observations to detect a clear trend in upper tropospheric water vapor.

Water vapor in the upper troposphere troposphere: see atmosphere.
troposphere

Lowest region of the atmosphere, bounded by the Earth below and the stratosphere above, with the upper boundary being about 6–8 mi (10–13 km) above the Earth's surface.
 contributes to the greenhouse effect greenhouse effect: see global warming.
greenhouse effect

Warming of the Earth's surface and lower atmosphere caused by water vapour, carbon dioxide, and other trace gases in the atmosphere. Visible light from the Sun heats the Earth's surface.
, and scientists predict that humidity will increase in the future along with rising levels of atmospheric carbon dioxide carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. .

However, there is currently no observing program that could detect the predicted trends.

To determine instrumental needs to measure long-term changes in upper tropospheric water vapor, R. Boers and E. van Meijgaard from Royal Netherlands Meteorological me·te·or·ol·o·gy  
n.
The science that deals with the phenomena of the atmosphere, especially weather and weather conditions.



[French météorologie, from Greek
 Institute, De Bilt, Netherlands, analyzed how frequently and for how long observations would need to be made to clearly detect a trend in upper tropospheric water vapor.

They used a regional climate model to simulate a perfect 150-year humidity record, and then sample from the model data to simulate realistic radiosonde radiosonde (rā`dēōsŏnd), group of instruments for simultaneous measurement and radio transmission of meteorological data, including temperature, pressure, and humidity of the atmosphere.  water vapor observations with various observation frequencies.

The analysis shows that it would take 30 years for a clear trend to show up in the perfect record; sampling every four days, it would take at least 50 years of observations to detect this trend.

The authors suggest that these results, along with economic considerations, should be an important consideration for those planning an atmospheric water vapor monitoring program. (ANI)

Copyright 2009 Asian News International The Asian News International (ANI) agency provides multimedia news to China and 50 bureaus in India. It covers virtually all of South Asia since its foundation and presently claims, on its official website, to be the leading South Asia-wide news agency.  (ANI) - All Rights Reserved.

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Publication:Asian News International
Date:Oct 28, 2009
Words:234
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