anoxia – Page 2 – Desdemona Despair

The almost dry bed of the Po river at Castel San Giovanni, near Piacenza, in June 2022. Photo: Pierpaolo Ferreri / EPA

August 14, 2022

Europe’s rivers run dry as scientists warn drought could be worst in 500 years – “There were no other events in the past 500 years similar to the drought of 2018. But this year, I think, is worse.”

By Jon Henley 13 August 2022 (The Guardian) – In places, the Loire can now be crossed on foot; France’s longest river has never flowed so slowly. The Rhine is fast becoming impassable to barge traffic. In Italy, the Po is 2 metres lower than normal, crippling crops. Serbia is dredging the Danube. Across Europe, […]

Projections of annual counts of high-tide flooding (HTF) days for the NOAA Intermediate Sea Level Rise (SLR) scenario. The NOAA minor flooding threshold is used for Honolulu, San Diego and St. Petersburg. The NOAA moderate flooding threshold is used for Boston to highlight a threshold that is not yet routinely exceeded, which is not the case for the Boston minor threshold. The 50th percentile from the ensemble of projections (blue line) and the 10th–90th percentile range (blue shading, with the 90th percentile highlighted in orange) show increasing numbers of HTF days per year. The year of inflection (YOI, open black circle) for each projection corresponds to abrupt increases in the frequency of HTF days, which are highlighted by comparing the projected increases (Δ) over two adjacent ten-year periods (dashed and solid black lines). Graphic: Thompson, et al., 2021 / Nature Climate Change

August 16, 2021

Sunny-day flooding is about to become more than a nuisance – “What’s scary about this paper is the idea of the inflection point. Can we adapt fast enough to keep pace?”

By Jim Morrison 2 August 2021 (WIRED) – During the summer of 2017, the tide rose to historic heights again and again in Honolulu, higher than at any time in the 112 years that records had been kept. Philip Thompson, director of the Sea Level Center at the University of Hawaii, wanted to know why. […]

Dead salmon on the shores of the Ugashik, Alaska in July 2019. More than 100,000 fish in Bristol Bay were killed by heat stress in 2019. Photo: Birch Block

January 19, 2020

Record summer heat in Alaska wiped out at least 100,000 Kuskokwim salmon in Bristol Bay – “I’ve never seen a salmon that is still ocean-bright acting in such a way”

By Isabelle Ross 15 January 2020 DILLINGHAM, Alaska (Alaska Public Media) – The sun beat down relentlessly on Bristol Bay this summer, heating up the rivers and lakes where millions of sockeye salmon returned to spawn. July was the region’s hottest month on record, and in some rivers, that heat was lethal. Tim Sands, an […]

Global pattern in the cumulative development of coastal hypoxia in the periods before 1969, 1970-1989, and 1990-2015. Each red dot represents a documented case related to human activities. Green dots are sites that have improved. Since the 1960s, the global number of hypoxic systems has about doubled every ten years up to 2000. Data: Based on Diaz and Rosenberg (2008), Diaz, et al. (2010), and Conley et al. (2011). Graphic: Laffoley and Baxter, 2019 / IUCN

December 10, 2019

Oceans losing oxygen at unprecedented rate, experts warn

By Fiona Harvey 7 December 2019 MADRID (The Guardian) – Oxygen in the oceans is being lost at an unprecedented rate, with “dead zones” proliferating and hundreds more areas showing oxygen dangerously depleted, as a result of the climate emergency and intensive farming, experts have warned. Sharks, tuna, marlin and other large fish species were […]

Free air CO2 enrichment experiments using native Australian forests. Elevated CO2 levels are used to examine the effects on native forests, animals, soils and grasses. Photo: Western Sydney University

June 24, 2019

Leaving microbes out of climate change conversation has major consequences, experts warn – “Climate change is literally starving ocean life”

By Ivy Shih 19 June 2019 (UNSW) – An international group of leading microbiologists have issued a warning, saying that not including microbes – the support system of the biosphere – in the climate change equation will have major negative flow-on effects. More than 30 microbiologists from 9 countries have issued a warning to humanity […]

June 9, 2019

As oceans warm, microbes could pump more carbon dioxide back into the air

By Kevin Krajick 29 April 2019 (Columbia University) – The world’s oceans soak up about a quarter of the carbon dioxide that humans pump into the air each year — a powerful brake on the greenhouse effect. In addition to purely physical and chemical processes, a large part of this is taken up by photosynthetic plankton as they incorporate carbon into their […]

January 10, 2018

Global warming has quadrupled ocean dead zones – “The decline in ocean oxygen ranks among the most serious effects of human activities on the Earth’s environment”

4 January 2018 (SERC) – In the past 50 years, the amount of water in the open ocean with zero oxygen has gone up more than fourfold. In coastal water bodies, including estuaries and seas, low-oxygen sites have increased more than 10-fold since 1950. Scientists expect oxygen to continue dropping even outside these zones as […]

March 23, 2016

Estimated disruptions to Earth’s great elemental cycles

23 March 2016 (Desdemona Despair) – Back in 2011, Desdemona was asked by a local church to give a presentation on the condition of the world’s oceans (State of the Oceans 2011 video; pdf slide deck; PowerPoint). As part of the talk, Des wanted estimates for human disturbances to the great cycles of elements on […]

November 25, 2011

Video: State of the Oceans 2011

20 November 2011 (Desdemona Despair) – Here’s Desdemona giving a presentation on the accelerating destruction of the oceans by various human activities. It’s basically Graph of the Day with narration. Download the slide deck: http://www.leftopia.com/presentations/State_Of_The_Oceans_2011.pdf http://www.leftopia.com/presentations/State_Of_The_Oceans_2011.pptx State of the Oceans 2011 Technorati Tags: ocean acidification,global warming,climate change,phenology,overfishing,ocean overexploitation,fish decline,mass extinction,extinction,coral,habitat loss,ecosystem disruption,dead zone,ocean anoxia,phosphorus,nitrogen,carbon,carbon dioxide,overpopulation,doom