Researchers investigate the correlation between wind and wave height in the Arctic Ocean

Researchers investigate the correlation between wind and wave height in the Arctic Ocean
Two wave buoys were deployed over the ice-free Arctic Ocean on 8 September 2016 during the Arctic research cruise by RV Mirai. Credit: Toshihiro Ozeki

An international research team led by Takuji Waseda, a professor of the University of Tokyo, Japan, has found an increase in high waves and winds in the ice-free waters of the Arctic Ocean, a potentially dangerous navigational tipping point for the "new and unusual" state of the waters.

The research was conducted as part of an Arctic region research project, called the Arctic Challenge for Sustainability (ArCS). The project umbrellas eight themes, each focused on a different aspect of environmental improvement and sustainability in the Arctic. Through the encompassing research themes, the project has mobilized almost all of the polar scientists in Japan.

"Forecasting of waves and estimating the chance of sea spray icing on a ship is very important for safe navigation under the new and unusual state of the Arctic Ocean," said co-author Jun Inoue, an associate professor of polar science at the National Institute of Polar Research, a part of the Inter-University Research Institute Corporation Research Organization of Information and Systems (ROIS) in Tokyo, Japan.

Inoue led the first theme of the ArCS project, which focused on studying the predictability of weather and sea-ice forecasts. The first theme of the project also looks into how users of the weather forecasts participate in providing related data to further improve such predictability. Their results were published in Scientific Reports in March 2018.

Researchers used the ERA-Interim reanalysis, a global atmospheric data collection system, to examine nearly four decades of emerging trends of increasingly extreme waves. They directly measured waves with buoys in the Arctic Sea in the summer of 2016 to validate the results predicted by the ERA-Interim reanalysis.

Researchers investigate the correlation between wind and wave height in the Arctic Ocean
(a) Buoy trajectories, sea-ice concentration (colour shading) and sea-level pressure (SLP) (contours) on 22 October 2016. The region bounded by the orange line indicates the area analyzed here. (b) An enlarged image of the buoy trajectories with the sea-ice concentration (colour shading) and SLP (contours) on 22 October 2016. (c) An enlarged image of the buoy trajectories with the significant wave height (colour shading) and SLP (contours) on 22 October 2016. The SLP, Hs and sea-ice concentration are from ERA-Interim reanalysis data. Credit: Scientific Reports

They saw an increase in both winds and high ocean waves, as expected since a few million square kilometers of the sea's ice covering has melted in the past forty years. The larger the ice-free water area, the greater the probability of encountering a large wave, according to Waseda, which has potentially grave implications for the shippers navigating through the Northern Sea Route, as well as for the coastal populations.

"As the entire Arctic Ocean is expected to be ice-free by 2050, the wave height is projected to increase correspondingly," Inoue wrote. Ice in the Arctic continues to melt, removing the windbreaks from the ice and allowing waves to grow.

"The gradual change in wave heights and frequency over the ice-free Arctic Ocean would influence not only... the business strategy of the [shippers] using the Northern Sea Route, but also on the local life near the coastal region," Inoue said.

Coastal erosion would also increase with the height and frequency of waves, according to Waseda.

"We need a skillful surface wind speed forecast to predict wave heights," Inoue said. Such a tool would help people on ships, and the coasts better prepare for the turbulence and potential flooding

Inoue pointed to the Polar Prediction Project, of which he is a steering committee member, coordinated by the World Meteorological Organization. The project is running the Year of Polar Prediction, an aggregated forum for scientists to better forecast weather and climate conditions in the polar regions.

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More information: Takuji Waseda et al, Correlated Increase of High Ocean Waves and Winds in the Ice-Free Waters of the Arctic Ocean, Scientific Reports (2018). DOI: 10.1038/s41598-018-22500-9
Journal information: Scientific Reports

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