We still know so little about climate, the earth, our oceans, and our sun!
We don't even understand cloud formation or formation of water vapor in the atmosphere very well.
Global Warming is hoax and Climate Change is a religion!
If so called climate change causes stress to trees, then this study suggests that a feedback mechanism is triggered to increase the cloud formation or cloud cover. Nature is very complex and has lots of feedback mechanism.
"A family of organic compounds released by trees could play a far greater role in cloud formation than previously thought. ...
When trees come under stress, they release organic molecules that react with ozone, nitrate radicals and other compounds in the atmosphere. These reactions create tiny solid particles called ultra-low-volatility organic compounds (ULVOCs). ...
In some cases, ULVOCs can grow large enough for water droplets to condense on their surfaces, encouraging cloud formation. Clouds have significant effects on Earth’s climate – many of which are poorly understood. Therefore, understanding the influence of ULVOCs cannot be overlooked in global climate models. ..."
"... Particularly the way in which cloud cover will develop in the future remains largely nebulous for the time being. However, this is a key factor in predicting the climate because more clouds reflect more solar radiation, thus cooling the earth’s surface. ...
Until now, sesquiterpenes have not been a focus of research. “This is because they are quite difficult to measure,” explains Dada. “Firstly because they react very quickly with ozone, and secondly because they occur much less frequently than the other substances.” Around 465 million tonnes of isoprene and 91 million tonnes of monoterpenes are released every year, whereas sesquiterpenes account for just 24 million tonnes. Nevertheless, the new study, of which Dada is the lead author, has shown that these compounds play an important role in cloud formation. According to the measurements, they form ten times more particles than the other two organic substances at the same concentration.
To determine this, ... authors used the unique CLOUD chamber at the European Organisation for Nuclear Research, CERN. The chamber is a sealed room in which different atmospheric conditions can be simulated. “At almost 30 cubic metres, this climate chamber is the purest of its kind worldwide,”... “So pure that it allows us to study sesquiterpenes even at the low concentrations recorded in the atmosphere.” ..."
From the abstract:
"Biogenic vapors form new particles in the atmosphere, affecting global climate. The contributions of monoterpenes and isoprene to new particle formation (NPF) have been extensively studied. However, sesquiterpenes have received little attention despite a potentially important role due to their high molecular weight. Via chamber experiments performed under atmospheric conditions, we report biogenic NPF resulting from the oxidation of pure mixtures of β-caryophyllene, α-pinene, and isoprene, which produces oxygenated compounds over a wide range of volatilities. We find that a class of vapors termed ultralow-volatility organic compounds (ULVOCs) are highly efficient nucleators and quantitatively determine NPF efficiency. When compared with a mixture of isoprene and monoterpene alone, adding only 2% sesquiterpene increases the ULVOC yield and doubles the formation rate. Thus, sesquiterpene emissions need to be included in assessments of global aerosol concentrations in pristine climates where biogenic NPF is expected to be a major source of cloud condensation nuclei."
How trees influence cloud formation (primary news source) As part of the international CLOUD project at the nuclear research centre CERN, researchers at PSI have identified so-called sesquiterpenes – gaseous hydrocarbons that are released by plants – as being a major factor in cloud formation. This finding could reduce uncertainties in climate models and help make more accurate predictions. ...
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