Friday , January 27 2023

2018 was the hottest year ever recorded for the oceans of the planet


Last year was the hottest for the oceans of the planet since global records began in 1958, according to an international team of scientists tracking data. Their findings were published on Wednesday in the scientific journal Advances in Sciences Atmospheric.

Year 2018 passed last year, last year, in 2017; the first five years of ocean heat came in the last five years. Last year, there is an astounding global warming trend, which is a direct result of the warming of the planet by humans, say the authors.

The same group of scientists published a study last week, which shows that the oceans heat up faster than scientists thought, absorbing more heat than previously known. This will result in a six-fold increase in ocean heating by 2081-2100 compared to the last 60 years.

Warmer oceans lead to a variety of issues, such as rising sea levels, more intense storms with heavier rainfall, coral bleaching and polar ice melting.

The increasing amount of heat-capturing gases, such as carbon dioxide, released into the atmosphere by humans, creates an energy imbalance that leads to global warming.

"The vast majority of global warming heat is deposited in the oceans of the world," the authors say, making it one of the best – if not the best – indicators of climate change. In fact, studies show that over 90% of the heat captured by greenhouse gases is absorbed into the ocean.

"Increasing ocean warmth is the incontestable proof that the Earth is warming up," the study said.

The heat of the ocean is proof of global warming

Kevin Trenberth, a researcher at the United Nations Climate Analysis Department for Atmospheric Research, and co-author of the study, said the ocean warmth trend is a better indicator of climate change than air temperature.

"The average global temperature record is heavily affected by weather, El Nino and so on," said Trenberth. The ocean heating signal is much more visible and not as noisy.

Impacts from the warmer oceans

Impacts from ocean warming have been visible in the past year, according to the study's authors.

The added heat led to an average global sea level increase of 29.5 millimeters relative to the average of the period 1981-2010. which was the biggest one ever noticed. Increasing sea levels makes coastal communities more sensitive to storm surges, coastal erosion and salty water intrusion from fresh water supply.

Hotter water has fueled a number of major hurricanes and typhoons around the world in 2018, including hurricanes Michael and Florence, which have caused massive wind damage and devastating flooding in the southeast US and Super Typhoon Mangkhut, the strongest storm of year. damage to the Philippines and Hong Kong.

Hotter water also allows the air to have more moisture, which overcharged the precipitations from Hurricane Florence in Carolinas. Warmer than the normal oceanic waters in the Indian Ocean, they also fueled major flood events in Japan and India.

Other effects of warmer oceans include whitening and death of coral reefs, which have been significant in recent years in the Great Coral Barrier in Australia.

Melting fish ice and ice shelves is another product of the heat added to the oceans and can also increase sea level rise as the ground ice flows into the ocean. An unauthorized study published earlier this week found that warmer ocean temperatures melted Antarctic ice at a rapid rate of acceleration.

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