May 4, 2018
Feature

Hurricane Intensity Is More Than Surface Deep

Improving the representation of upper-ocean layers in hurricane forecast models enhances their predictive skill

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The rate at which hurricanes strengthen, or intensify, is highly sensitive to sea surface temperatures in the core of the storm.

The Science   

Hurricanes draw energy from heat at the ocean surface. Thus, the rate at which hurricanes strengthen, or intensify, is highly sensitive to sea surface temperatures (SSTs) in the core of the storm.

Using Hurricane Matthew, a powerful storm from 2016, for comparison, researchers at the U.S. Department of Energy's Pacific Northwest National Laboratory analyzed the degree to which the layers beneath the ocean surface—referred to as upper-ocean stratification—affected SST and hurricane intensity and then applied this new knowledge to forecasts between 2005-2014. They found that an accurate representation of SST under a hurricane—even through relatively simple analytical formulations—can significantly improve the forecasts.

The Impact

The Statistical Hurricane Intensity Prediction Scheme (SHIPS) is a model used by the National Oceanic and Atmospheric Administration's National Hurricane Center in Miami, Florida, for operational forecasts. In this study, researchers showed that the model's forecasts could be improved significantly by including the effects of ocean temperature, density, and salinity on SST under the hurricane. Better forecasts are important for emergency planning and response in the face of destructive hurricanes.

 

Reference: K. Balaguru, G.R. Foltz, L.R. Leung, S.M. Hagos, D.R. Judi, "On the Use of Ocean Dynamic Temperature for Hurricane Intensity Forecasting." Weather and Forecasting 33(2), 411-418 (2018). [DOI: 10.1175/WAF-D-17-0143.1]

Key Capabilities

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About PNNL

Pacific Northwest National Laboratory draws on its distinguishing strengths in chemistry, Earth sciences, biology and data science to advance scientific knowledge and address challenges in energy resiliency and national security. Founded in 1965, PNNL is operated by Battelle and supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit the DOE Office of Science website. For more information on PNNL, visit PNNL's News Center. Follow us on Twitter, Facebook, LinkedIn and Instagram.

Published: May 4, 2018

Research Team

Karthik Balaguru, L. Ruby Leung, Samson M. Hagos, and David R. Judi, PNNL
Gregory R. Foltz, AOML