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Highly sensitive weather radar a gain for climate researchHighly sensitive weather radar a gain for climate research
23 August 2007 by TU Delft / KNMI
| Quote: | TU Delft has taken a new weather radar system into use, the 'Drizzle Radar', which can observe even the lightest of drizzles. This is an enormous gain for climate researchers and is attracting international attention. The radar was successfully installed on the 213 metre-high Royal Netherlands Meteorological Institute (KNMI) measurement tower in Cabauw, near Lopik, on Thursday, August 23. From this spot the highly sensitive radar, together with the other advanced instruments of the CESAR observatory (Cabauw Experimental Site for Atmospheric Research), is to provide a complete picture of the interaction between dust, clouds, rain and radiation. The latter is still one of the least understood factors in climate models.
Clouds and the climate
Clouds are of great importance for the greenhouse effect. On the one hand, clouds wrap a blanket round the Earth which retains heat, but they also cool the planet through the reflection of sunlight. Clouds can therefore compensate for some of the global warming, but the question is how much, and how precisely does it work. Dust particles play a crucial role in the formation of clouds and precipitation. They act as condensation nuclei, around which small droplets form. The more dust particles, the more dense the clouds, the more solar radiation is reflected and the cooler the Earth stays.
A cooler Earth leads, in its turn, to less precipitation, because cooler air cannot hold as much moisture as warm air. Thus we have an extremely complicated interplay of factors that can be elucidated only through detailed measurements. The new 'Drizzle radar' is able to measure cloud droplets and precipitation extremely accurately. In addition, the measurement tower in Cabauw monitors the quantity and composition of dust particles and of clouds. Climate researchers are particularly interested in the extent to which dust particles influence rainfall. |
http://www.tudelft.nl/live/pagina...d26-b6f1-7a7d0f8061fd&lang=en
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