Published: Sun, January 13, 2019
Science | By Cecil Little

Oceans warming faster than expected

Oceans warming faster than expected

This Trend has far-reaching consequences for fish or other organisms in the already oxygen-poor marine regions, for example, because in particular large fish in oxygen are not able to survive poor areas.

The world's oceans are heating up faster and faster and becoming stronger.

If humans don't do anything to mitigate climate change, warming in the upper part of the ocean will be six times higher by 2081-2100 than total ocean warming in the past 60 years, researchers estimate. Ocean heat content is not bothered much by weather fluctuations that do, however, affect the surface temperatures, and it is somewhat affected by El Niño events. In reality, the oceans' temperature, at waters down to 2,000 meters, reached a 0.1 degrees Celsius increase between 1975 and 2010.

The thermal expansion - water swelling as it warms - would raise sea level 30 centimeters, above any sea level rise from melting glaciers and ice sheets.

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Warmer oceans also contribute to stronger storms, hurricanes and extreme downpours.

The warming, measured since 1960, is faster than predicted by scientists in a 2013 Intergovernmental Panel on Climate Change report that looked at ocean warming, according to the study, published this week in the journal Science. "Global warming is close to ocean warming, and 2018 will be the warmest year on record, followed by 2017, then 2015". The new study analyzed earlier published information and data compiled by Argo, an worldwide system of almost 4,000 floats that measures temperature and saline levels in the upper parts of the world's oceans.

In the same direction, the European Union's Copernicus Climate Change Service estimated that 2018 had been the hottest year regarding global surface temperature.

The earth's oceans have absorbed more than 90% of heat caused by greenhouse gases trapped in the atmosphere, according to the New York Times, making them a vital regulator for the planet's thermostat.

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During the study, researchers used the data collected by a high-tech ocean observing system named Argo, which comprises an worldwide network of robotic floats that regularly monitor the salinity and temperature of ocean water.

"The warming is convoluted with natural variability, and one of the warmest spots was where [Florence] developed this past year and where Harvey developed this previous year", Trenberth said. Scientists made the conclusion of rising temperature after analyzing the Argo data with historic temperature information.

'For example, even if we meet the target of Paris Agreement (to limit climate change), ocean will continue warming and sea level will continue rise.

Three of the new studies included in the Science analysis calculated ocean heat content back to 1970 and before using new methods to correct for calibration errors and biases in the both the Argo and bathythermograph data.

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