Monday , May 23 2022

Global warming & # 39; ocean equivalent to an atomic bomb per second


This story was originally published by The Guardian and appears here as part of the Climate Desk collaboration.

Global warming warm ocean with the equivalent of an explosion of an atomic bomb per second for the last 150 years, according to the analysis of new research.

More than 90% of the heat trapped by greenhouse gas emissions by & # 39; effect & # 39; humanity gas was absorbed by the seas, a few percent only warm air, land and ice The large amount of & # 39; increasing energy with & # 39; oceans lead to an increase in sea level and allow hurricanes and typhoons become more intense.

Much heat has been stored in the depths of the ocean but the measurements here began only in & # 39; the last decades and the existing estimates of the total heat the oceans absorbed the band back around 1950. The new work extends that back to 1871. Scientists say that knowledge of past changes in the heat of the oceans was critical to predict the future of the climate change impact.

Calculation of the Guardian found that the average warming over that period & # 39; 150 years was equivalent to about 1.5 atomic bombs & # 39; Hiroshima every second. But heat accelerated during that time as the carbon increased, and now it was the equivalent of & # 39; between three and six atomic bombs per second.

"I try not doing this kind of & # 39; calculating, simply because I find it a & # 39; concern, "said Prof. Laure saw him, at the University & # 39; Oxford, who led the new research. "We usually try to compare heating with [human] use of energy, to make it less frightening. "

She added: "But of course, are many lay excess of & # 39; energy in the climate system and many of them end up in the ocean. M & # 39; there is no doubt. "The total heat taken from the ocean over the past 150 years was about 1,000 times the annual use of & # 39; the total population of all energy.

The research was published in the Proceedings journal South National Academy of Sciences and combined measurements of the surface temperature of the ocean since 1871 with computer models of ocean circulation.

Prof. Samar Khatiwala, also at the University & # 39; Oxford and part of the team, said: "Our approach is similar to & # 39; paint" different bits of surface & # 39; ocean b & # 39; dyes & # 39; different colors and monitoring & # 39; in the interior and spread over time. If we know x & # 39; it is the anomaly temperature of the sea surface in 1871 in Ocean North Atlantic can figure out how much to contribute to heating, for example, in the Indian Ocean Fund in 2018. "

The rise in sea level was among the longer dangerous impacts of climate change, and threatens billions & # 39; people living in coastal cities, and to assess young future increases is vital in preparing defenses. Some of the increase comes from melting snow bound to land in Greenland and elsewhere, but another key factor was the physical expansion of water as it becomes warmer.

However, waters do not heat with & # 39; uniformly since the current oceans transport heat around the globe. The reconstruction & # 39; the amount of & # 39; Heat absorbed by the oceans over the last 150 years is important because it provides baseline. In the Atlantic, for example, the team found that half of the increase seen in 1971 & # 39; low and middle latitudes resulted from heat transported by currents in the region.

The new work helps researchers make better predictions of rising sea levels for different regions in the future. "Future Changes in transport & # 39; ocean can & # 39; have serious consequences for the increase in the level of regional marine and risk & # 39; coastal flooding" said the researchers. "The understanding of the change in heat in the ocean and the role of circulation in designing heating models remain key to forecasting changes in global climate and regional increasing level sea. "

Dana Nuccitelli, environmental scientist who was not involved in the new research, said: "The heating rate of & # 39; ocean has increased as the accelerated global warming, and the value is approximately another three to six Hiroshima bombs per second in recent decades, depending on which data set and what time frame is used. This new study estimates the heating rate of the oceans for about three bombs of Hiroshima per second for the period 1990-2015, which is on the extreme end of other estimates. "

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