File:Oceanic Response Observations due to Passing Tropical Cyclones- An Assessment of Drag and Sea Spray Parameterizations (IA oceanicresponseo1094563167).pdf
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Oceanic Response Observations due to Passing Tropical Cyclones: An Assessment of Drag and Sea Spray Parameterizations ( ) | ||
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Author |
Gallagher, Stephan, D |
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Title |
Oceanic Response Observations due to Passing Tropical Cyclones: An Assessment of Drag and Sea Spray Parameterizations |
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Publisher |
Monterey, California. Naval Postgraduate School |
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Description |
In 2015, Air-Launched Autonomous Micro Observer float 9077 was intercepted by Hurricane Ignacio and revealed a 40 m isotherm depression preceding the traditional, well-documented upwelling response. To replicate this unique and apparent downwelling ahead of Hurricane Ignacio and three othersラIrma, Florence and Michael, the Price-Weller-Pinkel model permitted comparisons of tropical cyclone intensity indices and vertical velocity. When modeling the stress, two other traditional ideas were challenged. First, many legacy drag coefficients linearly increase with wind speed, while the modern variety maximize near tropical cyclone strength. Second it is believed sea spray droplets are sheared off large wave crests, quickly accelerate, but upon reentry, dampen smaller waves while fluxing considerable momentum to the ocean. However, many models bulk parameterize air-sea interaction processes with a legacy drag coefficient and omit spray. Therefore, this study aimed to simulate the aforementioned downwelling using seven legacy/modern drag coefficients, with and without spray stress. These analyses illustrated downwelling ahead of every storm, legacy drag coefficients as statistical outliers, invalid for TC modeling, and although its addition reduced model accuracy, sea spray remains paramount through modern drag coefficient selection. The confirmation of downwelling is supported by Ekman dynamics and may be significant in storm surge enhancement. Subjects: upper oceanic response, tropical cyclone, hurricane, downwelling, drag coefficient, sea spray, storm surge |
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Language | English | |
Publication date | September 2019 | |
Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
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Accession number |
oceanicresponseo1094563167 |
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Source | ||
Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
Licensing[edit]
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
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current | 12:38, 23 July 2020 | 1,275 × 1,650, 126 pages (6.24 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection oceanicresponseo1094563167 (User talk:Fæ/IA books#Fork8) (batch 1993-2020 #23757) |
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Short title | Oceanic Response Observations due to Passing Tropical Cyclones: An Assessment of Drag and Sea Spray Parameterizations |
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Author | Gallagher, Stephan, D |
Software used | Gallagher, Stephan, D |
Conversion program | Adobe Acrobat Pro 11.0.23 Paper Capture Plug-in |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.4 |