Presenting: Alex DesRosiers Other Authors: Ian Sears, Paul Flaherty, Jack Parrish, Richard Henning, Michael Holmes, Jess Williams, And Brian Belson
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1 Presenting: Alex DesRosiers Other Authors: Ian Sears, Paul Flaherty, Jack Parrish, Richard Henning, Michael Holmes, Jess Williams, And Brian Belson
2 Objectives Introduce Equation Describe Methodology Present Analysis/Results Conclusion Further Research
3 Question Can the current AOC Extrapolated Sea Level Pressure Equation be improved upon by adjusting lapse rate? A Sea Level Pressure reading produces a rounded pressure to the mb and the equation should replicate it Why does this matter?
4 Hurricane Lapse Rate The lapse rate is a change in temperature with altitude The Standard Lapse rate is -6.5 C per km A hurricane is non standard due to subsidence and latent heat release make for warm air temps in eye A possible hurricane Lapse Rate is -2.5 C per km
5 The AOC Equation for Extrapolated Sea Level Pressure SLP= PA GA Γstd PA Tv Γstd g Γstd Rd PA= Γstd 1 P stat Γstd Rd g 7 instances of Standard Lapse Rate
6 Deriving a New Lapse Rate Needed a lapse rate unique to each storm Simple calculation to produce it on the fly Unique Lapse Rate = (T surface Tf lightlevel ) GA Substitute into equation at all points where lapse rate is used and see how it changes the extrapolated SLP
7 Generating Cases Needed Center Drops where SLP is ground truth Had to pull them from NHC reconnaissance archive Generated 104 total cases using Python, SQL, and Excel Cases come from reconnaissance
8 Vortex Data Message (VDM)
9 Temp Drop Message
10 High Density Observation (HDOB)
11 Sample Case: Hurricane Gonzalo StaticPressGeoAlt AirTemp DewPt SLP Tsurf Storm AirCraft CenterID GONZALO NOAA3 16
12 First Attempt at Improvement
13 Systematically Over/Underestimating
14 Finding the Middle Calculate new average lapse rate (Unique Lapse Rate+Standard Lapse Rate) New Lapse Rate = 2 Plug new Lapse Rate back into equation Results brought us closer to ground truth
15 Possible Sources of Error Dropsonde does not always fall directly through column extrapolation was made from Sea Surface Temperatures are higher than the last sonde measured air temperatures The calculated lapse rate does not account for that difference in temperature Averaging it with the standard lapse rate brings it closer to ground truth
16 Adjusted Lapse Rate Sea Surface Temperature must be accounted for
17 Average Lapse Rate Improvement
18 The Air Force Equation The AF equation also creates a unique lapse rate for each storm Slightly different method
19 Results A smoothed density plot line was added for the resulting errors of all of the equations. This allows them to be plotted together showing their differences in accuracy and precision
20 Original AOC Equation and Derived Lapse Rate Equation
21 Air Force Results
22 Average Lapse Rate Results
23 All Methods Compared
24 Conclusions In our 104 case experiment, the Average Lapse Rate calculation outperformed all others If additional data show the current equation being less accurate, updating the equation would be valuable
25 Further Research Expanding the data set is important to solidifying these findings Creating consistency between the Air Force and NOAA would be challenging but valuable Exploring a weighted average technique Examine if Air Force or Average Lapse Rate equations out-perform each other at different pressure ranges
26 Questions
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