Der #Sauerstoffgehalt in Seen weltweit sinkt dramatisch. Laut einer Studie in Science Advances um bis zu 18,6 % in tieferen #Wasserschichten seit 1980.
Hauptursachen sind steigende #Temperaturen, zunehmende #Hitzewellen und #Algenblüten durch #Düngemittel-Einträge.
Über 80 % der untersuchten 15.000 Seen zeigen bereits #Sauerstoffmangel. Die Folge sind zunehmendes #Tiersterben und instabile #Ökosysteme.
Climate warming and heatwaves accelerate global lake deoxygenation, study reveals
https://www.eurekalert.org/news-releases/1077716
Long-term climate warming and the increasing frequency and intensity of short-term heatwaves are significantly reducing surface dissolved oxygen (DO) levels in lakes worldwide, according to a new study published in Science Advances.
Under anthropogenic stress, we talk a lot about #ocean #warming and ocean #acidification... but we should also be talking more about ocean #deoxygenation, as it is an ongoing problem. To understand just how bad it can get ( #extinction event bad ), we must turn, as usual, to the geological record.
https://doi.org/10.1016/j.earscirev.2023.104664
#WeekendReading: Behrooz et al. on water column #deoxygenation and #euxinia (inc. surface waters) at the Paleocene #Eocene Thermal Maximum.
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023PA004828
Map shows coastal sites where anthropogenic nutrients have exacerbated or caused oxygen declines to <2 mg/L (red dots), as well as ocean oxygen-minimum zones at 300 meters of depth (blue shaded regions). Image by Breitburg et al, 2018.
#Hypoxic areas
#oceans
#deoxygenation
Loss of oxygen in bodies of #water identified as new #tippingpoint
#Aquatic #deoxygenation as a planetary boundary and key regulator of Earth system stability
" It was discovered that a staggering 87% of the #rivers studied were experiencing persistent #warming, while 70% were suffering from #deoxygenation. While this phenomenon is more commonly associated with larger bodies of water like oceans and lakes, its presence in flowing rivers is a growing concern that has largely gone unnoticed until now."
https://www.onegreenplanet.org/environment/warming-rivers-losing-oxygen/
#Deoxygenation is commonly observed in #oceans and #lakes but less expected in #rivers. Assessments of almost 800 rivers revealed persistent warming in 87% and deoxygenation in 70% of the rivers. Mean deoxygenation rates per decade were higher than those in oceans. Projected future rates are between 1.6 and 2.5 times higher than historical rates, indicating significant ramifications for #waterquality and #aquatic #ecosystems.
Thousands of dead fish have washed up on Quintana Beach, Texas, due to a phenomenon called ocean deoxygenation. Ocean deoxygenation is the water's loss of oxygen caused by climate change, pollution, and overfishing. Ocean deoxygenation threatens marine life, biodiversity, and food security and worsens global warming.
#ocean #deoxygenation #fish https://www.thecooldown.com/outdoors/dead-fish-ocean-deoxygenation-quintana-beach-texas/
Ocean oxygen: The role of the Ocean in the oxygen we breathe and the threat of deoxygenation | New report of the European Marine Board
#Deoxygenation is increasing in the coastal and open Ocean, primarily due to human-induced #globalwarming and nutrient run-off from land, and projections show that the Ocean will continue losing oxygen as global warming continues.
#climatechange
Record temperature combined with an anticipated El Niño could devastate marine life and increase the chances of extreme weather.
"With #ocean warming and #deoxygenation, the available habitats for many #species are decreasing."
The overall decline of #oxygen content across the world’s #oceans and #coastal waters—a process known as ocean #deoxygenation—has been well documented, but #hypoxia on #coral #reefs has been relatively underexplored. Oxygen loss in the ocean is predicted to threaten #marine #ecosystems globally
#EarthScience #Environmental #ClimateChange #MarineBiology #sflorg
https://www.sflorg.com/2023/03/mb03172301.html
