Observed impact of mesoscale circulation on oceanic response to Typhoon Man-Yi (2007) |
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Authors: | SungHyun Nam Duk-jin Kim Wooil M Moon |
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Institution: | (1) Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093-0230, USA;(2) Research Institute of Oceanography (RIO), School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Republic of Korea;(3) Geophysics, Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada; |
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Abstract: | The oceanic response to a typhoon, where mesoscale ocean circulations co-exist, was investigated by analyzing the independent
observations of profiling floats data at three different locations, satellite altimetry data near the eye of Typhoon Man-Yi
(2007) before and after its passage, and synthetic aperture radar data taken during the typhoon’s passage. In spite of the
nearly symmetric wind pattern around the eye, the distribution of mesoscale eddies had a major impact on the surface currents
and mixed layer (ML) depths. As a result, the entrainment of the water below the ML into the ML was affected by the mesoscale
circulation and became asymmetric, which accounted for most of the changes observed in the temperature profiles. Changes in
the isotherms were driven primarily by the westward propagation of the mesoscale pattern rather than by the typhoon-induced
shoaling. The typhoon-induced shoaling could have played a significant role in the generation of high-frequency (e.g., near-inertial)
oscillations and/or sub-mesoscale structures. Although a similar or even greater energy flux was observed at the surface,
the entrainment within the anticyclonic circulation was weaker than that within the cyclonic circulation and at the edge of
the anticyclonic circulation because of the thick pre-existing ML. A strong ocean response to Typhoon Man-Yi (2007) within
a cyclonic circulation or at the edge of an anticyclonic circulation, rather than within an anticyclonic eddy, has implications
for the role of mesoscale ocean circulations in better understanding and forecasting the typhoon intensity. |
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