THE EFFECT OF TROPICAL CYCLONE PASSAGE ON UNDERSEA ACOUSTIC PARAMETERS IN THE EAST CHINA SEA
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Authors
Depompeo, Jasmine S.
Subjects
East China Sea
ECS
Climate Forecast System Reanalysis
CFSR
undersea acoustic parameters
Joint Typhoon Warning Center
JTWC
tropical cyclone passage
ECS
Climate Forecast System Reanalysis
CFSR
undersea acoustic parameters
Joint Typhoon Warning Center
JTWC
tropical cyclone passage
Advisors
Chu, Peter C.
Date of Issue
2024-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This research examines the impact of tropical cyclone passage on undersea acoustic parameters in the East China Sea using 222 historical tropical cyclone tracks and seven acoustic parameters from 1979 to 2010 (i.e., the global warming period). Data from the Fleet Numerical Meteorology and Oceanography Center’s Climate Forecast System Reanalysis ocean dataset and Joint Typhoon Warning Center’s Western North Pacific Ocean Best Track Data were analyzed. The acoustic parameters include in-layer gradient, surface duct cutoff frequency, sonic layer depth, below layer gradient, deep sound channel axis, deep sound channel strength, and critical depth. Results show that all acoustic parameters, with the exception of below layer gradient, experience a response to tropical cyclone passage that is correlated with storm intensity. Furthermore, the most significant anomalous acoustic response occurs in the summer months, and is most drastic with super typhoon passage. Ultimately, recognition of the effect of tropical cyclone passage on the water column will allow for more accurate ocean predictions, to include underwater acoustics, in an operationally relevant region.
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Thesis
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Distribution Statement
Distribution Statement A. Approved for public release: Distribution is unlimited.
Rights
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.