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Meteorological Technology International
Oceans

Ocean as important as atmosphere in causing Subpolar North Atlantic temperature changes, finds NOC study

Dan SymondsBy Dan SymondsMay 20, 20222 Mins Read
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A study by scientists at the UK’s National Oceanography Centre (NOC) has revealed for the first time that the ocean is as important as the atmosphere in causing unusual temperature variations in the Subpolar North Atlantic.

Furthermore, it shows that the ocean’s contribution has strengthened over the past 60 years at the expense of the atmosphere, pointing to the need for greater understanding of the ocean’s role in setting North Atlantic and European climate variability.

The study used observations of ocean temperature from the 1990s onwards and a climate simulation that includes the NOC high-res (10km) NEMO ocean model. It has been discovered that year-to-year hot and cold irregularities in the amount of heat in the upper level of the ocean (mixed layer) are around half of the time caused by changes in heat transported by ocean currents and mixing, and not primarily by heat exchange with the atmosphere as previously thought.

To establish possible long-term variations in the role of ocean transports and surface heat exchange, the scientists then applied patterns revealed by the study to historic ship observation data, dating back as far as 1870. It was found that ocean transports have played a more dominant role in year-to-year variability of mixed layer heat content since around 1960, which could signify changes in the Atlantic climate system, however further research is needed to establish this.

Professor Simon Josey, study lead at NOC, said, “The new results overturn the long-held view that year-to-year-variability in the temperature of the surface ocean is dominated by heat exchange with the atmosphere and establishes the strong role played by internal processes within the ocean itself. It is important to better understand why the surface temperature changes because an unusually warm or cold ocean can influence the atmosphere above and consequently both winter and summer weather over Europe. In addition, the changing role for the ocean that we have found since the 1960s is a potentially worrying sign of variations within the climate system although further research is needed to establish whether it is natural in origin or due to the climate crisis.”

To view the study in the journal Nature Communications Earth & Environment, click here.

Previous ArticleRecords broken for four key climate change indicators in 2021, warns WMO report
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