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Simulations of Hurricane Katrina (2005) with the 0.125 degree finite-volume General Circulation Model on the NASA Columbia SupercomputerHurricane Katrina was the sixth most intense hurricane in the Atlantic. Katrina's forecast poses major challenges, the most important of which is its rapid intensification. Hurricane intensity forecast with General Circulation Models (GCMs) is difficult because of their coarse resolution. In this article, six 5-day simulations with the ultra-high resolution finite-volume GCM are conducted on the NASA Columbia supercomputer to show the effects of increased resolution on the intensity predictions of Katrina. It is found that the 0.125 degree runs give comparable tracks to the 0.25 degree, but provide better intensity forecasts, bringing the center pressure much closer to observations with differences of only plus or minus 12 hPa. In the runs initialized at 1200 UTC 25 AUG, the 0.125 degree simulates a more realistic intensification rate and better near-eye wind distributions. Moreover, the first global 0.125 degree simulation without convection parameterization (CP) produces even better intensity evolution and near-eye winds than the control run with CP.
Document ID
20060013029
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Shen, B.-W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Atlas, R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Reale, O.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lin, S.-J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chern, J.-D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chang, J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Henze, C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Meteorology And Climatology
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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