Meteorology and Atmospheric Physics

, Volume 122, Issue 1–2, pp 19–32 | Cite as

Impact of ocean warm layer thickness on the intensity of hurricane Katrina in a regional coupled model

  • Hyodae SeoEmail author
  • Shang-Ping Xie
Original Paper


The effect of pre-storm subsurface thermal structure on the intensity of hurricane Katrina (2005) is examined using a regional coupled model. The Estimating Circulation and Climate of Ocean (ECCO) ocean state estimate is used to initialize the ocean component of the coupled model, and the source of deficiencies in the simulation of Katrina intensity is investigated in relation to the initial depth of 26 °C isotherm (D26). The model underestimates the intensity of Katrina partly due to shallow D26 in ECCO. Sensitivity tests with various ECCO initial fields indicate that the correct relationship between intensity and D26 cannot be derived because D26 variability is underestimated in ECCO. A series of idealized experiments is carried out by modifying initial ECCO D26 to match the observed range. A more reasonable relationship between Katrina’s intensity and pre-storm D26 emerges: the intensity is much more sensitive to D26 than to sea surface temperature (SST). Ocean mixed layer process plays a critical role in modulating inner-core SSTs when D26 is deep, reducing mixed layer cooling and lowering the center pressure of the Katrina. Our result lends strong support to the notion that accurate initialization of pre-storm subsurface thermal structure in prediction models is critical for a skillful forecast of intensity of Katrina and likely other intense storms.


Simple Ocean Data Assimilation Ocean Mixed Layer Storm Intensity Equivalent Potential Temperature Rapid Intensification 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



HS and SPX thank the support from NSF, NOAA, NASA and Japan Agency for Marine-Earth Science and Technology. HS acknowledges support from the Penzance Endowed Fund in Support of Assistant Scientists at WHOI. We thank the anonymous reviewers for their comments and suggestions, which substantially improved the manuscript.


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Copyright information

© Springer-Verlag Wien 2013

Authors and Affiliations

  1. 1.Physical Oceanography DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA
  2. 2.Scripps Institution of OceanographyUniversity of California San DiegoLa JollaUSA

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