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Dear all –
Appreciating the ongoing discussion. As a non-expert, designing and implementing land-and-water management projects in Africa, I am finding it very useful in the context of ‘climate change literacy’ – which is something we see must start to be articulated and disseminated widely, including in schools.
Thomas answered below a question that was forming in my mind of evapo vs transpiration. I am trying to appreciate the difference in terms of cooling effect, in laymans terms. Can someone help to interpret Walter’s piece below, in terms of the big picture air conditioner? IE grams of soil water taken up by plants, significance of 590 calories in terms of cooling, etc.
Meanwhile two overarching messages seem to be: 1. Plants cool the planet (until some point) and 2. We need to look after water levels in the soil (the ‘tank’) to ensure plants have the supply they need (not to mention people and rivers etc) eg in the corn belt example, one contributor seems to be the tank is not being well looked after due to tilled soils..
every extra gram of soil water that is transpired can transfer up to 590 calories of heat from the soil surface back up into the atmosphere thereby cooling that habitat and region. As that transpired water condenses to forms clouds with high albedo that can reflect up to 80% of the incident solar energy back out to space this can also further cool that habitat and regions. As these cloud droplets are coalesced on precipitation nuclei to form raindrops most of this transpired water can be returned to the soil to be again transpired and recycled continually enhancing the productivity, cooling and resilience of that landscape and the communities dependent on it.
Thanks,
Richard Hatfield,
Kenya & S Africa
From: soil...@googlegroups.com [mailto:soil...@googlegroups.com]
On Behalf Of Thomas Goreau
Sent: Wednesday, July 20, 2016 5:53 PM
To: soil...@googlegroups.com
Subject: Re: [soil-age] More comments on the corn/heat dome connection?
The key is to realize that around 90% of the water vapor entering the atmosphere from soil goes through plants, transpiration rather than physical evaporation. So when we reduce total photosynthesis by habitat degradation we reduce the heat transfer from soil to air nearly in proportion. The opportunities for cooling lie anywhere that plant growth can be increased!
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Dear all –Appreciating the ongoing discussion. As a non-expert, designing and implementing land-and-water management projects in Africa, I am finding it very useful in the context of ‘climate change literacy’ – which is something we see must start to be articulated and disseminated widely, including in schools.Thomas answered below a question that was forming in my mind of evapo vs transpiration. I am trying to appreciate the difference in terms of cooling effect, in laymans terms. Can someone help to interpret Walter’s piece below, in terms of the big picture air conditioner? IE grams of soil water taken up by plants, significance of 590 calories in terms of cooling, etc.Meanwhile two overarching messages seem to be: 1. Plants cool the planet (until some point) and 2. We need to look after water levels in the soil (the ‘tank’) to ensure plants have the supply they need (not to mention people and rivers etc) eg in the corn belt example, one contributor seems to be the tank is not being well looked after due to tilled soils..every extra gram of soil water that is transpired can transfer up to 590 calories of heat from the soil surface back up into the atmosphere thereby cooling that habitat and region. As that transpired water condenses to forms clouds with high albedo that can reflect up to 80% of the incident solar energy back out to space this can also further cool that habitat and regions. As these cloud droplets are coalesced on precipitation nuclei to form raindrops most of this transpired water can be returned to the soil to be again transpired and recycled continually enhancing the productivity, cooling and resilience of that landscape and the communities dependent on it.Thanks,Richard Hatfield,Kenya & S Africa
Judy
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Correct me if my thinking is off, but as average temperatures rise around the world such that plants increasingly experience temps that cause them to close their stomata and stop transpiration, it would seem that having both mixes of C3 and C4 species, as well as multiple layers of plants (canopy trees, understory trees, bushes, typical crops, and ground cover plants) would be an important strategy to allow shaded plants to experience below shut-off temps longer than they would in a monocropped system. Such mixed systems would presumably be able to keep transpiration going for longer, right?
And transpiration sounds like it is our friend in the short term to try to cool the planet.
-- Philip
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