Oceans were the warmest in 2019 than ever before in human history
The world’s oceans were warmer in 2019 than at any other time in human history, according to an international study.
The average global temperature of the oceans rose in 2019 to 0.075 ° C (0.135 ° F) above the average temperature between 1981 and 2010.
To heat the water in the world so much, a huge amount of energy is required, an estimated 228 million joules of heat.
Academics claim that this corresponds to 3.6 billion Hiroshima atomic bomb explosions.
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The ocean absorbs most of the excess heat from greenhouse gas emissions, leading to rising ocean temperatures
“The Hiroshima atomic bomb exploded with an energy of about 63,000,000,000,000 joules,” said Lijing Cheng, lead document author and associate professor at the International Center for Climate and Environmental Sciences at the Chinese Academy of Sciences.
“The amount of heat we’ve put into the oceans in the last 25 years is equivalent to 3.6 billion Hiroshima atomic bomb explosions.
“This measured global warming is irrefutable and is further evidence of global warming.
“There are no reasonable alternatives apart from the human emissions of heat capture gases to explain this heating.”
Researchers from 11 different institutions from China and the US participated in the research, published in the journal Advances in Atmospheric Sciences.
“It is crucial to understand how quickly things change,” said John Abraham, co-author and professor of mechanical engineering at the University of St. Thomas in the US.
“The key to answering this question lies in the oceans – that is where the vast majority of the heat ends up.
“If you want to understand global warming, you have to measure global warming.”
Trend of the ocean temperature from 1960 to 2019 in the three large ocean basins from area up to 2,000 m. The zonal and vertical sections are organized around the Southern Ocean in the middle. Black contours show the corresponding climatic average temperature at intervals of 2 degrees Celsius
The Atlantic Ocean and the Southern Ocean heated more compared to most other basins, with the most warming felt between the surface and 6500 feet down.
Researchers also compared the temperature changes from 1955 to 1986 with the period 1987 to 2019 – with the most recent period of 450 percent warmer.
Since 1970, more than 90 percent of global warming has been going to the ocean, while less than 4 percent have heated the atmosphere and land where people live.
Heat accumulates in the ocean due to its large heat capacity, but the remaining 4 percent manifests itself as atmospheric warming, a drying, warming land mass and melting of land and sea ice.
“Even with that small fraction that affects the atmosphere and the land, global warming has led to an increase in catastrophic fires in the Amazon, California and Australia in 2019, and we see that this will continue until 2020,” said Professor Cheng .
“Global warming has caused heat waves in the sea in the Tasmanian Sea and other regions.”
Elevated ocean temperature reduces dissolved oxygen in the ocean because oxygen is less soluble in warmer water.
This influences marine life, certain corals and other temperature-sensitive marine organisms.
The rising temperatures are sparkling heat waves from the sea, with a notorious copy in the North Pacific called ‘the blob’.
Oceans occupy 70 percent of the Earth’s surface and make up 95 percent of all available space for life
Scientists believe it has decimated marine life, ranging from plankton to whale, and killed 100 million cod.
A 2017 hotspot in the Gulf of Mexico also produced Hurricane Harvey, which the Rice Kinder Institute said it led to 82 deaths and caused approximately £ 83 billion ($ 108 billion) in damage.
Not for the first time, scientists are calling on humanity to undo climate change in the event of disastrous consequences.
“Global warming is real and it’s getting worse,” said Abraham. “And this is just the tip of the iceberg for what is to come.
‘Fortunately we can do something about it – we can use energy more wisely and we can diversify our energy sources.
“We have the power to reduce this problem.”
The study uses an analysis method developed by researchers from the Chinese Academy of Sciences in Beijing and includes changes in ocean temperature that are registered by the National Oceanic and Atmospheric Administration in the US.
HOW MANY WILL SEA LEVELS IN THE FOLLOWING CENTURIES?
Global sea level could rise to 2300 as much as 1.2 meters (4 feet), even if we reach the 2015 Paris climate targets, scientists have warned.
The long-term change will be driven by a thaw of ice from Greenland to Antarctica, which will have to pull the coastlines again.
Sea level rise threatens cities from Shanghai to London, to low-lying parts of Florida or Bangladesh, and to entire nations such as the Maldives.
It is vital that we reduce emissions as quickly as possible to prevent even greater increases, a team of researchers led by Germany said in a new report.
By 2300, the report predicted that sea levels would rise by 0.7 – 1.2 meters, even if nearly 200 countries fully met the targets of the 2015 Paris Agreement.
The objectives of the agreements include the reduction of greenhouse gas emissions to zero in the second half of this century.
The ocean level will rise inexorably, because existing industrial gases that retain heat in the atmosphere will linger, causing more ice to melt.
In addition, water naturally expands as it heats above four degrees Celsius (39.2 ° F).
Every five years after 2020 in the peak of global emissions would mean an additional 20 centimeters (8 inch) rise in sea level by 2300.
“Sea level is often communicated as a very slow process that you can’t do much about … but the next 30 years really matter,” says lead author Dr. Matthias Mengel from the Potsdam Institute for Climate Impact Research in Potsdam, Germany, told Reuters.
None of the nearly 200 governments signing the Paris agreements is on track to deliver on its promises.