
Would a solar chimney with an inlet near the ocean and the outlet way inland bring humidity to a desert?
The thought is to use a solar tower, or chimney, similar to the one proposed in Australia, to simply pump humid air inland, thus making the desert smaller by creating clouds and rain. I suspect the tower would not have to be very tall, but the tunnel would have to be fairly long, but cheaply built. I am thinking that a clear plastic tunnel might even keep itself inflated as it gathers heat from the sun.The natural rise of the land as it leaves the ocean would help this along.
The thought was that it would use SOLAR energy to pump the moist air. The pipe would be transparent like a green house. It could be built out of something cheap like plastic.
In a case, where you are trying to make a large scale climate change to an area that is naturally hot and dry, may be much more difficult than the given solution of just pumping in more low level moisture into a dry region. What maybe worse is that you will cause a chain reaction and, at the end, we may see more damage done than good in not only the area you want to change, but her areas surrounding this region or in other areas of the planet.
First, in most dry and hot desert regions, the atmosphere is hot and dry because of the flow of air above this location is usually sinking (moving downword). In order to increase the chance of more clouds and precipitation, you will likely need to some how change this large scale general sinking motion found in a deep layer above this region to a general rising motion.
Secondly, any climate changes one region will likely result in significant climate changes in other regions. Different climates around the world are the result of the earth trying to balance the energy it gets from the sun. The impact of the given solution on local and large scale world may be very difficult to predict. Researcg studies must be conducted. But even the best studies may not be able to predict all the problems in the short and long term that may crop up in the future.
So, even if your solution did work to increase the humidity, you may still not be able to produce the clouds and precipitaton you want. What you may end up with is an area that is hot and humit, but still see little rain. I also do not think this is a good idea without looking into all the complications that may occur.
That is just my opinion.
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