Nobody in their right mind would want to fight global warming. I'll take life in the Modern Warm Period any day over life in one of the cooling periods.
What has to be fought is the warmageddon cult and their control-freak energy policies!
Posted on 11/20/2024 12:08:53 PM PST by Red Badger
Lake Geneva’s CO₂ emissions stem mainly from rock erosion, not organic matter, reshaping our understanding of lake carbon cycles.
Unlike oceans, lakes release considerable amounts of CO₂ into the atmosphere. But what causes this difference, and what mechanisms drive it? For the first time, scientists at UNIL have mapped out the entire carbon cycle in Lake Geneva, developing a model that can now be applied to many of the world’s largest lakes.
* Contrary to previous beliefs, it is the natural erosion of rocks that is responsible for the significant CO2 emissions from Lake Geneva and many of the world’s large lakes.
* This study provides the missing piece for understanding the carbon cycle in lakes.
* The LéXPLORE lake platform in Switzerland played a major role in this discovery of international significance.
Like most lakes in the world, Lake Geneva is an emitter of greenhouse gases, particularly carbon dioxide (CO2). Annually, it produces as much CO2 as the automobile transport of the city of Lausanne (≃ 150,000 inhabitants). This phenomenon – the production of CO2 by lakes – has been known for years. There is, however, widespread debate as to the mechanisms at work.
Traditional scientific theories suggest that lake CO2 emissions are primarily due to the influx of organic matter from surrounding soils. This material, originating from the decomposition of plant and animal residues, is carried into the lake by rainfall, where it is broken down by microorganisms, leading to the release of CO2. This process is known as respiration. While this theory accounts for the behavior of some lakes, it doesn’t apply to Lake Geneva, which receives very little organic matter from its shores. In theory, its annual carbon balance should be neutral, with winter CO2 production (from organic matter decomposition and water mixing) balanced by summer CO2 absorption (due to algae photosynthesis). So why does Lake Geneva still emit large amounts of CO2?
A team of UNIL scientists has just deciphered the mechanisms involved. Most of the emissions actually come from the natural erosion of rocks in the lake’s upstream basin. When rainwater hits the rocks, it releases bicarbonate and calcium ions, which then find their way into the lake.
In summer, under the effect of heat and the growth of algae – which change the PH of the water and act as a catalyst – the ions form microparticles of limestone. This is known as calcite precipitation. This chemical reaction releases CO2, giving the lake its milky blue-green appearance in the warm season. Algae continue to absorb CO2, but this is not enough to compensate for the massive production resulting from rock erosion. The additional emissions are therefore the result of a geological process, not just a biological one, as previously thought.
This discovery was published in Science Advances. “Our results not only explain the carbon cycle in Lake Geneva, they also reveal a universal process that applies to several of the world’s great lakes,” explains Marie-Elodie Perga, professor of limnology at UNIL’s Faculty of Geosciences and Environment and co-author of the study. “This issue had been nagging at me since my thesis,” she explains. “Using a scientific infrastructure that is unique in the world – the LéXPLORE platform (see inset) – we were able to observe, model, and equate these processes on a very fine scale, providing the missing piece to traditional carbon cycle modeling.” Laid out on Lake Geneva, the floating laboratory made it possible to monitor various parameters linked to the carbon cycle, continuously and at high frequency.
The right way to combat global warming
In addition to the purely scientific interest of this discovery, this new data is central to the fight against global warming.
“Assessments are carried out every year to identify the emitters (sources) and storages (sinks) of carbon on our planet,” explains Marie-Elodie Perga. “It’s very important to have in-depth knowledge of how CO2 is naturally transported, stored, and transformed between continents, water, and the atmosphere. Only a global vision will enable us to take effective action to combat global warming.”
The LéXPLORE platform
LéXPLORE is a 10 m x 10 m scientific research platform located on Lake Geneva in Switzerland, almost 600 m from the shore. It is equipped with high-tech instrumentation (109 sensors) and provides continuous measurements, day and night, in all weather conditions.
LéXPLORE brings together five institutions (EPFL, EAWAG, INRAE, UNIL, UNIGE) conducting cutting-edge, multidisciplinary research on the lake and its atmosphere. It is also used as a training and teaching facility, and as a popularization tool for the general public.
Reference:
“Calcite precipitation: The forgotten piece of lakes’ carbon cycle”
by Gaël Many, Nicolas Escoffier, Pascal Perolo, Fabian Bärenbold, Damien Bouffard and Marie-Elodie Perga, 30 October 2024, Science Advances.
DOI: 10.1126/sciadv.ado5924
Whatever
We must immediately drain the Great Lakes!...................
Get rid of all lakes to ease Global Warming.
SUV’s parking at the lakes edge.
deep subject...
95% of the global CO2 comes from nature, only 5% is man made.
Without even researching this, this is agenda driven, sloppy or ignorant...or all three together.
I have zero doubt that outgassing of CO2 from the ocean during warming trends is exponentially greater than the outgassing of CO2 from Lake Geneva, or any other lake.
Now. If they tell me they made a mistake and that Lake Geneva (or any other lake) emits more CO2 in a given time frame PER VOLUME OF WATER I would be willing to investigate it.
But Lake Geneva (or any other lake) cannot and does not emit more CO2 overall in a given time frame than all the oceans.
Wait, what?
They’re still learning new things about our atmosphere? I thought it was settled science?
CO2=plant food.
I just read one account that says the oceans outgas more than 2 Petagrams of CO2 annually, where Lake Geneva emits the same as a large city.
Sloppy writing, probably, or deliberately as part of an agenda-driven fake narrative.
Probably both.
because of the smoke on the water.
ISWYDT.......................
Spot on any lake with it does
What a bunch of idiots. It would actually be hilarious if they didn’t want to use their Climate Alarmism as a tool to subjugate us.
2 Pg = 2 trillion kilograms.
Canada has more lakes in number than the rest of the world combined. Time for anther round of Blame Canada!
Nobody in their right mind would want to fight global warming. I'll take life in the Modern Warm Period any day over life in one of the cooling periods.
What has to be fought is the warmageddon cult and their control-freak energy policies!
It would probably be better to put a protective coating or covering on all exposed rock to protect it against erosion.
We actually need lakes and streams to maintain biodiversity, and also to drain rainwater safely into the oceans to keep it out of the hands of farmers who want to irrigate crops. This is especially important in California.
Exposed rock we don’t need.
For those unfamiliar with kommiegrams, what is that in freedom units?
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