New research using detailed 3D ocean models provides the first global-scale demonstration of how climate warming affects underwater tides, particularly along coastlines. The findings, published in the journal Nature Climate Change, suggest that sea level rise due to climate change could exacerbate storm surges and coastal flooding.

Key points from the study:

Ocean Tides and Climate Warming: The study's models reveal that as the Earth's climate warms, subsurface ocean currents called internal tides experience significant changes in their vertical structure.

Impact on Coastal Tides: These alterations in subsurface ocean currents influence the behavior of surface tides, particularly near coastlines. Surface tidal heights can either amplify or diminish depending on the location.

Higher Surge, Larger Waves: The changes in surface tides can affect the height and impact of storm surges and waves. This means some coastal areas could face increased risks of flooding and erosion.

Global Variability: The influence of climate warming on tides varies regionally, with the tropics experiencing more pronounced changes compared to higher latitudes.

Regions at Risk: The study highlights regions such as the Atlantic and Pacific Oceans' tropical coasts that are particularly vulnerable to these changes in coastal tides.

Implications for Coastal Communities: The findings underscore the need for improved understanding and consideration of the effects of climate warming on tides to ensure better management and adaptation strategies for coastal communities.

The research team led by Dr. Weiqing Han from Nanjing University of Information Science and Technology hopes their findings will contribute to more accurate assessments of climate change impacts on coastal environments and hazards. By incorporating these effects into future projections and planning, decision-makers can develop effective measures to mitigate climate-related risks in coastal zones.