AGW in general > Science

Precipitation trends

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mitch:
On China rain--by the time that the air mass gets to the Tibetan Plateau there is basically no way to add much additional water vapor. If the cloud seeding actually works, which I question, it will dry the air mass and make it less likely to rain downstream. However, this dry air mass will be interacting with wet ones coming from off the ocean over China. 

Ultimate answer is that it is complicated to what extent it will affect rainfall in other regions.

bligh8:
It’s a hard rain that’s fallen…
Note in the first graph there’s no upper limit,  just grater than 75%
Half or more of the Ocean beaches are under caution for high level of bacteria.
The run off has turned the Ocean brown for what appears to be several miles to seaward.

vox_mundi:
Researchers Find Precipitation Thresholds Regulate Carbon Exchange


--- Quote ---... Our results suggest that the short-term carbon balance of ecosystems may be more sensitive to respiration losses than previously thought and that model simulations may underestimate the positive carbon–climate feedbacks associated with respiration.

... Ecosystems either soak up carbon through photosynthesis—a negative feedback that could reduce future warming—or release it through respiration—a positive feedback that could enhance future warming. Understanding how climate change might impact ecosystem photosynthesis and respiration is critical for predicting future carbon dynamics.

Liu's team discovered that whether ecosystems across the U.S. uptake carbon or release it is dependent on water availability. The primary control switches from production to respiration at an annual precipitation threshold between 30 and 35 inches in the contiguous United States. The carbon balance of ecosystems in the dry West is very sensitive to photosynthesis. In contrast, the carbon balance of more mesic Eastern U.S. ecosystems is more sensitive to carbon lost through respiration.

However, climate models do not reflect this precipitation threshold. Liu and his co-authors determined that these models are far too sensitive to photosynthesis and not sensitive enough to respiration, suggesting the Earth's ecosystems may lose more carbon to the atmosphere in the future as surface temperatures continue to warm.

"This study suggests we know more about the negative feedback loop and less about the positive one."

Zhihua Liu et al, Precipitation thresholds regulate net carbon exchange at the continental scale, Nature Communications (2018)
--- End quote ---

bligh8:
Older homes in this area NJ were built with porous cinder block, these changing rainfall patterns dry/very wet are contracting expanding the Marlboro clay substrate, changing the static pressure loads on  home foundations = Step cracking then horizontal cracking….a new industry has come alive….vertical carbon fiber straps epoxied to foundation walls in an effort to stabilize the walls.  It el work for a while…. maybe.

sidd:
Re: "vertical carbon fiber straps epoxied to foundation walls in an effort to stabilize the walls. "

This might need a different thread, but i doubt epoxy/carbon fiber. I have stabilized failing concrete block wall in basements in clay, and it takes large steel members, lots of digging and most important fix the drainage because it is hydrostatic pressure as well as clay swell/shrink that kills you. Sometimes pile driving is involved.

My experience with epoxy/carbon strap is that it mebbe ok above grade where you can see failure, but below grade moisture degrades the epoxy , and believe it or not, things eat away at it. Then it fails invisibly. But perhaps they have better and more toxic epoxy.

sidd

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