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Discussion papers | Copyright
https://doi.org/10.5194/os-2018-93
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Sep 2018

Research article | 04 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Changes in the properties of deep and intermediate water masses in the Nordic Seas from 1997 to 2016

Małgorzata Merchel and Waldemar Walczowski Małgorzata Merchel and Waldemar Walczowski
  • Physical Oceanography Department, Institute of Oceanology Polish Academy of Sciences, Sopot, 81-712, Poland

Abstract. This study investigated the temporal variability of the basic physical properties of deep and intermediate waters in the Nordic Seas from 1997 to 2016. Special attention paid to quantifying changes in their temperature and salinity and determining potential drivers of these changes. Hydrographic data were obtained during annual cruises of the R/V Oceania in the Nordic Seas region from 1997 to 2016.

The results show that, in the past 20 years, deep and intermediate waters in the studied region have warmed at least 10 times more than the mean global ocean temperature change; salinity has also changed. This means that changes in these waters' properties have a much greater impact on recent climate change intensification than previously thought. For example, ocean circulation, dissolved oxygen, carbon dioxide content, and sea level rise, may also change much faster.

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Małgorzata Merchel and Waldemar Walczowski
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Małgorzata Merchel and Waldemar Walczowski
Małgorzata Merchel and Waldemar Walczowski
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Short summary
In the last two decades, deep and intermediate water in the Nordic Seas has warmed at least ten times more (0.36 °C at 700 m) than mean global values (0.03 °C at 700 m). Changes in the deep and intermediate water properties in the area may have much stronger impacts on the recent intensification of climate change than previously forecast, increasing ocean circulation, the amount of dissolved oxygen and carbon dioxide in the deep sea, and sea level rise at a much faster rate.
In the last two decades, deep and intermediate water in the Nordic Seas has warmed at least ten...
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